diff --git a/.travis.yml b/.travis.yml
index 0f720b7375e..b35dabcbb5f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,7 @@ language: node_js
 node_js:
   - 'node'
   - '10'
-  - '6'
+  - '8'
 
 sudo: false
 
diff --git a/Gulpfile.js b/Gulpfile.js
index 68a2b79f222..7d31e0a6137 100644
--- a/Gulpfile.js
+++ b/Gulpfile.js
@@ -618,6 +618,10 @@ const configureNightly = () => exec(process.execPath, ["scripts/configurePrerele
 task("configure-nightly", series(buildScripts, configureNightly));
 task("configure-nightly").description = "Runs scripts/configurePrerelease.ts to prepare a build for nightly publishing";
 
+const configureInsiders = () => exec(process.execPath, ["scripts/configurePrerelease.js", "insiders", "package.json", "src/compiler/core.ts"])
+task("configure-insiders", series(buildScripts, configureInsiders));
+task("configure-insiders").description = "Runs scripts/configurePrerelease.ts to prepare a build for insiders publishing";
+
 const publishNightly = () => exec("npm", ["publish", "--tag", "next"]);
 task("publish-nightly", series(task("clean"), task("LKG"), task("clean"), task("runtests-parallel"), publishNightly));
 task("publish-nightly").description = "Runs `npm publish --tag next` to create a new nightly build on npm";
diff --git a/Jakefile.js b/Jakefile.js
index c6b1cde9d4e..18f4aa56f8d 100644
--- a/Jakefile.js
+++ b/Jakefile.js
@@ -24,7 +24,7 @@ const host = process.env.TYPESCRIPT_HOST || process.env.host || "node";
 
 const defaultTestTimeout = 40000;
 const useBuilt =
-    process.env.USE_BUILT === "true" ? true :
+    (process.env.USE_BUILT === "true" || process.env.CI === "true") ? true :
     process.env.LKG === "true" ? false :
     false;
 
diff --git a/src/compiler/binder.ts b/src/compiler/binder.ts
index f3494783514..17919a326d5 100644
--- a/src/compiler/binder.ts
+++ b/src/compiler/binder.ts
@@ -3296,7 +3296,7 @@ namespace ts {
         let transformFlags = subtreeFlags;
 
         if (!node.variableDeclaration) {
-            transformFlags |= TransformFlags.AssertESNext;
+            transformFlags |= TransformFlags.AssertES2019;
         }
         else if (isBindingPattern(node.variableDeclaration.name)) {
             transformFlags |= TransformFlags.AssertES2015;
diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index f7cc72c534d..9021a50ef8d 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -12693,10 +12693,11 @@ namespace ts {
                 else if (source.flags & TypeFlags.Conditional) {
                     if (target.flags & TypeFlags.Conditional) {
                         // Two conditional types 'T1 extends U1 ? X1 : Y1' and 'T2 extends U2 ? X2 : Y2' are related if
-                        // one of T1 and T2 is related to the other, U1 and U2 are identical types, X1 is related to X2,
-                        // and Y1 is related to Y2.
-                        if (isTypeIdenticalTo((<ConditionalType>source).extendsType, (<ConditionalType>target).extendsType) &&
-                            (isRelatedTo((<ConditionalType>source).checkType, (<ConditionalType>target).checkType) || isRelatedTo((<ConditionalType>target).checkType, (<ConditionalType>source).checkType))) {
+                        // they have the same distributivity, T1 and T2 are identical types, U1 and U2 are identical
+                        // types, X1 is related to X2, and Y1 is related to Y2.
+                        if ((<ConditionalType>source).root.isDistributive === (<ConditionalType>target).root.isDistributive &&
+                            isTypeIdenticalTo((<ConditionalType>source).extendsType, (<ConditionalType>target).extendsType) &&
+                            isTypeIdenticalTo((<ConditionalType>source).checkType, (<ConditionalType>target).checkType)) {
                             if (result = isRelatedTo(getTrueTypeFromConditionalType(<ConditionalType>source), getTrueTypeFromConditionalType(<ConditionalType>target), reportErrors)) {
                                 result &= isRelatedTo(getFalseTypeFromConditionalType(<ConditionalType>source), getFalseTypeFromConditionalType(<ConditionalType>target), reportErrors);
                             }
@@ -14472,26 +14473,15 @@ namespace ts {
                     inferFromTypes(source, getUnionType([getTrueTypeFromConditionalType(<ConditionalType>target), getFalseTypeFromConditionalType(<ConditionalType>target)]));
                 }
                 else if (target.flags & TypeFlags.UnionOrIntersection) {
-                    const targetTypes = (<UnionOrIntersectionType>target).types;
-                    let typeVariableCount = 0;
-                    let typeVariable: TypeParameter | IndexedAccessType | undefined;
-                    // First infer to each type in union or intersection that isn't a type variable
-                    for (const t of targetTypes) {
-                        if (getInferenceInfoForType(t)) {
-                            typeVariable = <InstantiableType>t;
-                            typeVariableCount++;
-                        }
-                        else {
-                            inferFromTypes(source, t);
-                        }
-                    }
-                    // Next, if target containings a single naked type variable, make a secondary inference to that type
-                    // variable. This gives meaningful results for union types in co-variant positions and intersection
-                    // types in contra-variant positions (such as callback parameters).
-                    if (typeVariableCount === 1) {
+                    for (const t of (<UnionOrIntersectionType>target).types) {
                         const savePriority = priority;
-                        priority |= InferencePriority.NakedTypeVariable;
-                        inferFromTypes(source, typeVariable!);
+                        // Inferences directly to naked type variables are given lower priority as they are
+                        // less specific. For example, when inferring from Promise<string> to T | Promise<T>,
+                        // we want to infer string for T, not Promise<string> | string.
+                        if (getInferenceInfoForType(t)) {
+                            priority |= InferencePriority.NakedTypeVariable;
+                        }
+                        inferFromTypes(source, t);
                         priority = savePriority;
                     }
                 }
@@ -14579,11 +14569,11 @@ namespace ts {
                 return undefined;
             }
 
-            function inferFromMappedTypeConstraint(source: Type, target: Type, constraintType: Type): boolean {
+            function inferToMappedType(source: Type, target: MappedType, constraintType: Type): boolean {
                 if (constraintType.flags & TypeFlags.Union) {
                     let result = false;
                     for (const type of (constraintType as UnionType).types) {
-                        result = inferFromMappedTypeConstraint(source, target, type) || result;
+                        result = inferToMappedType(source, target, type) || result;
                     }
                     return result;
                 }
@@ -14594,7 +14584,7 @@ namespace ts {
                     // such that direct inferences to T get priority over inferences to Partial<T>, for example.
                     const inference = getInferenceInfoForType((<IndexType>constraintType).type);
                     if (inference && !inference.isFixed) {
-                        const inferredType = inferTypeForHomomorphicMappedType(source, <MappedType>target, constraintType as IndexType);
+                        const inferredType = inferTypeForHomomorphicMappedType(source, target, <IndexType>constraintType);
                         if (inferredType) {
                             const savePriority = priority;
                             priority |= InferencePriority.HomomorphicMappedType;
@@ -14605,18 +14595,28 @@ namespace ts {
                     return true;
                 }
                 if (constraintType.flags & TypeFlags.TypeParameter) {
-                    // We're inferring from some source type S to a mapped type { [P in T]: X }, where T is a type
-                    // parameter. Infer from 'keyof S' to T and infer from a union of each property type in S to X.
+                    // We're inferring from some source type S to a mapped type { [P in K]: X }, where K is a type
+                    // parameter. First infer from 'keyof S' to K.
                     const savePriority = priority;
                     priority |= InferencePriority.MappedTypeConstraint;
                     inferFromTypes(getIndexType(source), constraintType);
                     priority = savePriority;
+                    // If K is constrained to a type C, also infer to C. Thus, for a mapped type { [P in K]: X },
+                    // where K extends keyof T, we make the same inferences as for a homomorphic mapped type
+                    // { [P in keyof T]: X }. This enables us to make meaningful inferences when the target is a
+                    // Pick<T, K>.
+                    const extendedConstraint = getConstraintOfType(constraintType);
+                    if (extendedConstraint && inferToMappedType(source, target, extendedConstraint)) {
+                        return true;
+                    }
+                    // If no inferences can be made to K's constraint, infer from a union of the property types
+                    // in the source to the template type X.
                     const valueTypes = compact([
                         getIndexTypeOfType(source, IndexKind.String),
                         getIndexTypeOfType(source, IndexKind.Number),
                         ...map(getPropertiesOfType(source), getTypeOfSymbol)
                     ]);
-                    inferFromTypes(getUnionType(valueTypes), getTemplateTypeFromMappedType(<MappedType>target));
+                    inferFromTypes(getUnionType(valueTypes), getTemplateTypeFromMappedType(target));
                     return true;
                 }
                 return false;
@@ -14631,7 +14631,7 @@ namespace ts {
                 }
                 if (getObjectFlags(target) & ObjectFlags.Mapped) {
                     const constraintType = getConstraintTypeFromMappedType(<MappedType>target);
-                    if (inferFromMappedTypeConstraint(source, target, constraintType)) {
+                    if (inferToMappedType(source, <MappedType>target, constraintType)) {
                         return;
                     }
                 }
@@ -21550,13 +21550,8 @@ namespace ts {
             }
             if (signature.hasRestParameter) {
                 const restType = getTypeOfSymbol(signature.parameters[paramCount]);
-                if (isTupleType(restType)) {
-                    if (pos - paramCount < getLengthOfTupleType(restType)) {
-                        return restType.typeArguments![pos - paramCount];
-                    }
-                    return getRestTypeOfTupleType(restType);
-                }
-                return getIndexTypeOfType(restType, IndexKind.Number);
+                const indexType = getLiteralType(pos - paramCount);
+                return getIndexedAccessType(restType, indexType);
             }
             return undefined;
         }
@@ -21564,18 +21559,22 @@ namespace ts {
         function getRestTypeAtPosition(source: Signature, pos: number): Type {
             const paramCount = getParameterCount(source);
             const restType = getEffectiveRestType(source);
-            if (restType && pos === paramCount - 1) {
+            const nonRestCount = paramCount - (restType ? 1 : 0);
+            if (restType && pos === nonRestCount) {
                 return restType;
             }
-            const start = restType ? Math.min(pos, paramCount - 1) : pos;
             const types = [];
             const names = [];
-            for (let i = start; i < paramCount; i++) {
+            for (let i = pos; i < nonRestCount; i++) {
                 types.push(getTypeAtPosition(source, i));
                 names.push(getParameterNameAtPosition(source, i));
             }
+            if (restType) {
+                types.push(getIndexedAccessType(restType, numberType));
+                names.push(getParameterNameAtPosition(source, nonRestCount));
+            }
             const minArgumentCount = getMinArgumentCount(source);
-            const minLength = minArgumentCount < start ? 0 : minArgumentCount - start;
+            const minLength = minArgumentCount < pos ? 0 : minArgumentCount - pos;
             return createTupleType(types, minLength, !!restType, /*readonly*/ false, names);
         }
 
diff --git a/src/compiler/commandLineParser.ts b/src/compiler/commandLineParser.ts
index ec34adc1d2a..e82c2895ad0 100644
--- a/src/compiler/commandLineParser.ts
+++ b/src/compiler/commandLineParser.ts
@@ -15,6 +15,7 @@ namespace ts {
         ["es2016", "lib.es2016.d.ts"],
         ["es2017", "lib.es2017.d.ts"],
         ["es2018", "lib.es2018.d.ts"],
+        ["es2019", "lib.es2019.d.ts"],
         ["esnext", "lib.esnext.d.ts"],
         // Host only
         ["dom", "lib.dom.d.ts"],
@@ -42,8 +43,11 @@ namespace ts {
         ["es2018.intl", "lib.es2018.intl.d.ts"],
         ["es2018.promise", "lib.es2018.promise.d.ts"],
         ["es2018.regexp", "lib.es2018.regexp.d.ts"],
-        ["esnext.array", "lib.esnext.array.d.ts"],
-        ["esnext.symbol", "lib.esnext.symbol.d.ts"],
+        ["es2019.array", "lib.es2019.array.d.ts"],
+        ["es2019.string", "lib.es2019.string.d.ts"],
+        ["es2019.symbol", "lib.es2019.symbol.d.ts"],
+        ["esnext.array", "lib.es2019.array.d.ts"],
+        ["esnext.symbol", "lib.es2019.symbol.d.ts"],
         ["esnext.asynciterable", "lib.es2018.asynciterable.d.ts"],
         ["esnext.intl", "lib.esnext.intl.d.ts"],
         ["esnext.bigint", "lib.esnext.bigint.d.ts"]
@@ -198,6 +202,7 @@ namespace ts {
                 es2016: ScriptTarget.ES2016,
                 es2017: ScriptTarget.ES2017,
                 es2018: ScriptTarget.ES2018,
+                es2019: ScriptTarget.ES2019,
                 esnext: ScriptTarget.ESNext,
             }),
             affectsSourceFile: true,
@@ -205,7 +210,7 @@ namespace ts {
             paramType: Diagnostics.VERSION,
             showInSimplifiedHelpView: true,
             category: Diagnostics.Basic_Options,
-            description: Diagnostics.Specify_ECMAScript_target_version_Colon_ES3_default_ES5_ES2015_ES2016_ES2017_ES2018_or_ESNEXT,
+            description: Diagnostics.Specify_ECMAScript_target_version_Colon_ES3_default_ES5_ES2015_ES2016_ES2017_ES2018_ES2019_or_ESNEXT,
         },
         {
             name: "module",
diff --git a/src/compiler/core.ts b/src/compiler/core.ts
index c5505ec3736..4bd4801ce8f 100644
--- a/src/compiler/core.ts
+++ b/src/compiler/core.ts
@@ -1396,9 +1396,10 @@ namespace ts {
 
     export function assign<T extends object>(t: T, ...args: (T | undefined)[]) {
         for (const arg of args) {
-            for (const p in arg!) {
-                if (hasProperty(arg!, p)) {
-                    t![p] = arg![p]; // TODO: GH#23368
+            if (arg === undefined) continue;
+            for (const p in arg) {
+                if (hasProperty(arg, p)) {
+                    t[p] = arg[p];
                 }
             }
         }
diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
index f2f9ea23028..a7abf046f62 100644
--- a/src/compiler/diagnosticMessages.json
+++ b/src/compiler/diagnosticMessages.json
@@ -3109,7 +3109,7 @@
         "category": "Message",
         "code": 6014
     },
-    "Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'.": {
+    "Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'.": {
         "category": "Message",
         "code": 6015
     },
diff --git a/src/compiler/transformer.ts b/src/compiler/transformer.ts
index aabc6be57a0..d8a2848bcc3 100644
--- a/src/compiler/transformer.ts
+++ b/src/compiler/transformer.ts
@@ -42,6 +42,10 @@ namespace ts {
             transformers.push(transformESNext);
         }
 
+        if (languageVersion < ScriptTarget.ES2019) {
+            transformers.push(transformES2019);
+        }
+
         if (languageVersion < ScriptTarget.ES2018) {
             transformers.push(transformES2018);
         }
diff --git a/src/compiler/transformers/declarations.ts b/src/compiler/transformers/declarations.ts
index a4361e17248..ccc67197327 100644
--- a/src/compiler/transformers/declarations.ts
+++ b/src/compiler/transformers/declarations.ts
@@ -1012,7 +1012,9 @@ namespace ts {
                             if (!isPropertyAccessExpression(p.valueDeclaration)) {
                                 return undefined;
                             }
+                            getSymbolAccessibilityDiagnostic = createGetSymbolAccessibilityDiagnosticForNode(p.valueDeclaration);
                             const type = resolver.createTypeOfDeclaration(p.valueDeclaration, enclosingDeclaration, declarationEmitNodeBuilderFlags, symbolTracker);
+                            getSymbolAccessibilityDiagnostic = oldDiag;
                             const varDecl = createVariableDeclaration(unescapeLeadingUnderscores(p.escapedName), type, /*initializer*/ undefined);
                             return createVariableStatement(/*modifiers*/ undefined, createVariableDeclarationList([varDecl]));
                         });
diff --git a/src/compiler/transformers/declarations/diagnostics.ts b/src/compiler/transformers/declarations/diagnostics.ts
index b4c72c79012..9a9aed99e47 100644
--- a/src/compiler/transformers/declarations/diagnostics.ts
+++ b/src/compiler/transformers/declarations/diagnostics.ts
@@ -26,7 +26,8 @@ namespace ts {
         | ImportEqualsDeclaration
         | TypeAliasDeclaration
         | ConstructorDeclaration
-        | IndexSignatureDeclaration;
+        | IndexSignatureDeclaration
+        | PropertyAccessExpression;
 
     export function canProduceDiagnostics(node: Node): node is DeclarationDiagnosticProducing {
         return isVariableDeclaration(node) ||
@@ -46,7 +47,8 @@ namespace ts {
             isImportEqualsDeclaration(node) ||
             isTypeAliasDeclaration(node) ||
             isConstructorDeclaration(node) ||
-            isIndexSignatureDeclaration(node);
+            isIndexSignatureDeclaration(node) ||
+            isPropertyAccessExpression(node);
     }
 
     export function createGetSymbolAccessibilityDiagnosticForNodeName(node: DeclarationDiagnosticProducing) {
@@ -123,7 +125,7 @@ namespace ts {
     }
 
     export function createGetSymbolAccessibilityDiagnosticForNode(node: DeclarationDiagnosticProducing): (symbolAccessibilityResult: SymbolAccessibilityResult) => SymbolAccessibilityDiagnostic | undefined {
-        if (isVariableDeclaration(node) || isPropertyDeclaration(node) || isPropertySignature(node) || isBindingElement(node) || isConstructorDeclaration(node)) {
+        if (isVariableDeclaration(node) || isPropertyDeclaration(node) || isPropertySignature(node) || isPropertyAccessExpression(node) || isBindingElement(node) || isConstructorDeclaration(node)) {
             return getVariableDeclarationTypeVisibilityError;
         }
         else if (isSetAccessor(node) || isGetAccessor(node)) {
@@ -164,7 +166,7 @@ namespace ts {
             }
             // This check is to ensure we don't report error on constructor parameter property as that error would be reported during parameter emit
             // The only exception here is if the constructor was marked as private. we are not emitting the constructor parameters at all.
-            else if (node.kind === SyntaxKind.PropertyDeclaration || node.kind === SyntaxKind.PropertySignature ||
+            else if (node.kind === SyntaxKind.PropertyDeclaration || node.kind === SyntaxKind.PropertyAccessExpression || node.kind === SyntaxKind.PropertySignature ||
                 (node.kind === SyntaxKind.Parameter && hasModifier(node.parent, ModifierFlags.Private))) {
                 // TODO(jfreeman): Deal with computed properties in error reporting.
                 if (hasModifier(node, ModifierFlags.Static)) {
diff --git a/src/compiler/transformers/es2019.ts b/src/compiler/transformers/es2019.ts
new file mode 100644
index 00000000000..7dfd17481eb
--- /dev/null
+++ b/src/compiler/transformers/es2019.ts
@@ -0,0 +1,37 @@
+/*@internal*/
+namespace ts {
+    export function transformES2019(context: TransformationContext) {
+        return chainBundle(transformSourceFile);
+
+        function transformSourceFile(node: SourceFile) {
+            if (node.isDeclarationFile) {
+                return node;
+            }
+
+            return visitEachChild(node, visitor, context);
+        }
+
+        function visitor(node: Node): VisitResult<Node> {
+            if ((node.transformFlags & TransformFlags.ContainsES2019) === 0) {
+                return node;
+            }
+            switch (node.kind) {
+                case SyntaxKind.CatchClause:
+                    return visitCatchClause(node as CatchClause);
+                default:
+                    return visitEachChild(node, visitor, context);
+            }
+        }
+
+        function visitCatchClause(node: CatchClause): CatchClause {
+            if (!node.variableDeclaration) {
+                return updateCatchClause(
+                    node,
+                    createVariableDeclaration(createTempVariable(/*recordTempVariable*/ undefined)),
+                    visitNode(node.block, visitor, isBlock)
+                );
+            }
+            return visitEachChild(node, visitor, context);
+        }
+    }
+}
diff --git a/src/compiler/transformers/esnext.ts b/src/compiler/transformers/esnext.ts
index 7c20d39cdea..80debb46f8a 100644
--- a/src/compiler/transformers/esnext.ts
+++ b/src/compiler/transformers/esnext.ts
@@ -16,22 +16,9 @@ namespace ts {
                 return node;
             }
             switch (node.kind) {
-                case SyntaxKind.CatchClause:
-                    return visitCatchClause(node as CatchClause);
                 default:
                     return visitEachChild(node, visitor, context);
             }
         }
-
-        function visitCatchClause(node: CatchClause): CatchClause {
-            if (!node.variableDeclaration) {
-                return updateCatchClause(
-                    node,
-                    createVariableDeclaration(createTempVariable(/*recordTempVariable*/ undefined)),
-                    visitNode(node.block, visitor, isBlock)
-                );
-            }
-            return visitEachChild(node, visitor, context);
-        }
     }
 }
diff --git a/src/compiler/tsconfig.json b/src/compiler/tsconfig.json
index 14b7ce377e5..84bedb34b7c 100644
--- a/src/compiler/tsconfig.json
+++ b/src/compiler/tsconfig.json
@@ -31,6 +31,7 @@
         "transformers/ts.ts",
         "transformers/es2017.ts",
         "transformers/es2018.ts",
+        "transformers/es2019.ts",
         "transformers/esnext.ts",
         "transformers/jsx.ts",
         "transformers/es2016.ts",
diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index 39abf8dde90..b0efe59eca0 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -4722,7 +4722,8 @@ namespace ts {
         ES2016 = 3,
         ES2017 = 4,
         ES2018 = 5,
-        ESNext = 6,
+        ES2019 = 6,
+        ESNext = 7,
         JSON = 100,
         Latest = ESNext,
     }
@@ -5136,6 +5137,7 @@ namespace ts {
         Super = 1 << 25,
         ContainsSuper = 1 << 26,
         ContainsES2018 = 1 << 27,
+        ContainsES2019 = 1 << 28,
 
         // Please leave this as 1 << 29.
         // It is the maximum bit we can set before we outgrow the size of a v8 small integer (SMI) on an x86 system.
@@ -5147,6 +5149,7 @@ namespace ts {
         AssertTypeScript = TypeScript | ContainsTypeScript,
         AssertJsx = ContainsJsx,
         AssertESNext = ContainsESNext,
+        AssertES2019 = ContainsES2019,
         AssertES2018 = ContainsES2018,
         AssertES2017 = ContainsES2017,
         AssertES2016 = ContainsES2016,
diff --git a/src/compiler/utilities.ts b/src/compiler/utilities.ts
index e1c005f359d..d44b31ace08 100644
--- a/src/compiler/utilities.ts
+++ b/src/compiler/utilities.ts
@@ -4608,6 +4608,8 @@ namespace ts {
         switch (options.target) {
             case ScriptTarget.ESNext:
                 return "lib.esnext.full.d.ts";
+            case ScriptTarget.ES2019:
+                return "lib.es2019.full.d.ts";
             case ScriptTarget.ES2018:
                 return "lib.es2018.full.d.ts";
             case ScriptTarget.ES2017:
diff --git a/src/harness/evaluator.ts b/src/harness/evaluator.ts
index 168fda1d767..a22bdb958bc 100644
--- a/src/harness/evaluator.ts
+++ b/src/harness/evaluator.ts
@@ -56,6 +56,7 @@ namespace evaluator {
         }
 
         const evaluateText = `(function (module, exports, require, __dirname, __filename, ${globalNames.join(", ")}) { ${output.text} })`;
+        // tslint:disable-next-line:no-eval
         const evaluateThunk = eval(evaluateText) as (module: any, exports: any, require: (id: string) => any, dirname: string, filename: string, ...globalArgs: any[]) => void;
         const module: { exports: any; } = { exports: {} };
         evaluateThunk.call(globals, module, module.exports, noRequire, vpath.dirname(output.file), output.file, FakeSymbol, ...globalArgs);
diff --git a/src/harness/fourslash.ts b/src/harness/fourslash.ts
index b0bb35d5db3..f3a7197e777 100644
--- a/src/harness/fourslash.ts
+++ b/src/harness/fourslash.ts
@@ -3159,6 +3159,7 @@ ${code}
             const debug = new FourSlashInterface.Debug(state);
             const format = new FourSlashInterface.Format(state);
             const cancellation = new FourSlashInterface.Cancellation(state);
+            // tslint:disable-next-line:no-eval
             const f = eval(wrappedCode);
             f(test, goTo, plugins, verify, edit, debug, format, cancellation, FourSlashInterface.Classification, FourSlashInterface.Completion, verifyOperationIsCancelled);
         }
diff --git a/src/harness/harness.ts b/src/harness/harness.ts
index 13ef2adbf90..a78a04c3ecb 100644
--- a/src/harness/harness.ts
+++ b/src/harness/harness.ts
@@ -77,6 +77,7 @@ namespace Utils {
         const environment = getExecutionEnvironment();
         switch (environment) {
             case ExecutionEnvironment.Browser:
+                // tslint:disable-next-line:no-eval
                 eval(fileContents);
                 break;
             case ExecutionEnvironment.Node:
diff --git a/src/harness/harnessLanguageService.ts b/src/harness/harnessLanguageService.ts
index a78ef88e5b7..b70afecb791 100644
--- a/src/harness/harnessLanguageService.ts
+++ b/src/harness/harnessLanguageService.ts
@@ -766,6 +766,7 @@ namespace Harness.LanguageService {
         }
 
         setTimeout(callback: (...args: any[]) => void, ms: number, ...args: any[]): any {
+            // tslint:disable-next-line:ban
             return setTimeout(callback, ms, args);
         }
 
diff --git a/src/lib/esnext.array.d.ts b/src/lib/es2019.array.d.ts
similarity index 100%
rename from src/lib/esnext.array.d.ts
rename to src/lib/es2019.array.d.ts
diff --git a/src/lib/es2019.d.ts b/src/lib/es2019.d.ts
new file mode 100644
index 00000000000..b25f9e1d76a
--- /dev/null
+++ b/src/lib/es2019.d.ts
@@ -0,0 +1,4 @@
+/// <reference lib="es2018" />
+/// <reference lib="es2019.array" />
+/// <reference lib="es2019.string" />
+/// <reference lib="es2019.symbol" />
diff --git a/src/lib/es2019.full.d.ts b/src/lib/es2019.full.d.ts
new file mode 100644
index 00000000000..2056578133e
--- /dev/null
+++ b/src/lib/es2019.full.d.ts
@@ -0,0 +1,5 @@
+/// <reference lib="es2019" />
+/// <reference lib="dom" />
+/// <reference lib="webworker.importscripts" />
+/// <reference lib="scripthost" />
+/// <reference lib="dom.iterable" />
diff --git a/src/lib/es2019.string.d.ts b/src/lib/es2019.string.d.ts
new file mode 100644
index 00000000000..a0cde55c2e5
--- /dev/null
+++ b/src/lib/es2019.string.d.ts
@@ -0,0 +1,13 @@
+interface String {
+  /** Removes the trailing white space and line terminator characters from a string. */
+  trimEnd(): string;
+
+  /** Removes the leading white space and line terminator characters from a string. */
+  trimStart(): string;
+
+  /** Removes the trailing white space and line terminator characters from a string. */
+  trimLeft(): string;
+
+  /** Removes the leading white space and line terminator characters from a string. */
+  trimRight(): string;
+}
diff --git a/src/lib/esnext.symbol.d.ts b/src/lib/es2019.symbol.d.ts
similarity index 100%
rename from src/lib/esnext.symbol.d.ts
rename to src/lib/es2019.symbol.d.ts
diff --git a/src/lib/esnext.d.ts b/src/lib/esnext.d.ts
index 4f3045706b6..b46f8df7620 100644
--- a/src/lib/esnext.d.ts
+++ b/src/lib/esnext.d.ts
@@ -1,5 +1,3 @@
-/// <reference lib="es2018" />
-/// <reference lib="esnext.array" />
+/// <reference lib="es2019" />
 /// <reference lib="esnext.bigint" />
-/// <reference lib="esnext.symbol" />
 /// <reference lib="esnext.intl" />
diff --git a/src/lib/libs.json b/src/lib/libs.json
index 95ae5e81a6a..fa5f4060acd 100644
--- a/src/lib/libs.json
+++ b/src/lib/libs.json
@@ -6,6 +6,7 @@
         "es2016",
         "es2017",
         "es2018",
+        "es2019",
         "esnext",
         // Host only
         "dom.generated",
@@ -33,9 +34,10 @@
         "es2018.regexp",
         "es2018.promise",
         "es2018.intl",
-        "esnext.array",
+        "es2019.array",
+        "es2019.string",
+        "es2019.symbol",
         "esnext.bigint",
-        "esnext.symbol",
         "esnext.intl",
         // Default libraries
         "es5.full",
@@ -43,6 +45,7 @@
         "es2016.full",
         "es2017.full",
         "es2018.full",
+        "es2019.full",
         "esnext.full"
     ],
     "paths": {
diff --git a/src/server/editorServices.ts b/src/server/editorServices.ts
index 6dccc08c4b5..e9d97f6e03c 100644
--- a/src/server/editorServices.ts
+++ b/src/server/editorServices.ts
@@ -7,7 +7,6 @@ namespace ts.server {
     export const ProjectsUpdatedInBackgroundEvent = "projectsUpdatedInBackground";
     export const ProjectLoadingStartEvent = "projectLoadingStart";
     export const ProjectLoadingFinishEvent = "projectLoadingFinish";
-    export const SurveyReady = "surveyReady";
     export const LargeFileReferencedEvent = "largeFileReferenced";
     export const ConfigFileDiagEvent = "configFileDiag";
     export const ProjectLanguageServiceStateEvent = "projectLanguageServiceState";
@@ -30,11 +29,6 @@ namespace ts.server {
         data: { project: Project; };
     }
 
-    export interface SurveyReady {
-        eventName: typeof SurveyReady;
-        data: { surveyId: string; };
-    }
-
     export interface LargeFileReferencedEvent {
         eventName: typeof LargeFileReferencedEvent;
         data: { file: string; fileSize: number; maxFileSize: number; };
@@ -146,7 +140,6 @@ namespace ts.server {
     }
 
     export type ProjectServiceEvent = LargeFileReferencedEvent |
-        SurveyReady |
         ProjectsUpdatedInBackgroundEvent |
         ProjectLoadingStartEvent |
         ProjectLoadingFinishEvent |
@@ -518,9 +511,6 @@ namespace ts.server {
         /** Tracks projects that we have already sent telemetry for. */
         private readonly seenProjects = createMap<true>();
 
-        /** Tracks projects that we have already sent survey events for. */
-        private readonly seenSurveyProjects = createMap<true>();
-
         /*@internal*/
         readonly watchFactory: WatchFactory<WatchType, Project>;
 
@@ -722,14 +712,6 @@ namespace ts.server {
             this.eventHandler(event);
         }
 
-        /* @internal */
-        sendSurveyReadyEvent(surveyId: string) {
-            if (!this.eventHandler) {
-                return;
-            }
-            this.eventHandler({ eventName: SurveyReady, data: { surveyId } });
-        }
-
         /* @internal */
         sendLargeFileReferencedEvent(file: string, fileSize: number) {
             if (!this.eventHandler) {
@@ -1611,20 +1593,6 @@ namespace ts.server {
             return project;
         }
 
-        /*@internal*/
-        sendSurveyReady(project: ExternalProject | ConfiguredProject): void {
-            if (this.seenSurveyProjects.has(project.projectName)) {
-                return;
-            }
-
-            if (project.getCompilerOptions().checkJs !== undefined) {
-                const name = "checkJs";
-                this.logger.info(`Survey ${name} is ready`);
-                this.sendSurveyReadyEvent(name);
-                this.seenSurveyProjects.set(project.projectName, true);
-            }
-        }
-
         /*@internal*/
         sendProjectTelemetry(project: ExternalProject | ConfiguredProject): void {
             if (this.seenProjects.has(project.projectName)) {
diff --git a/src/server/project.ts b/src/server/project.ts
index b296668e6ae..280cedb424d 100644
--- a/src/server/project.ts
+++ b/src/server/project.ts
@@ -1431,7 +1431,6 @@ namespace ts.server {
             }
             this.projectService.sendProjectLoadingFinishEvent(this);
             this.projectService.sendProjectTelemetry(this);
-            this.projectService.sendSurveyReady(this);
             return result;
         }
 
@@ -1627,7 +1626,6 @@ namespace ts.server {
         updateGraph() {
             const result = super.updateGraph();
             this.projectService.sendProjectTelemetry(this);
-            this.projectService.sendSurveyReady(this);
             return result;
         }
 
diff --git a/src/server/session.ts b/src/server/session.ts
index e5b128c984e..b47dfe6b716 100644
--- a/src/server/session.ts
+++ b/src/server/session.ts
@@ -610,10 +610,6 @@ namespace ts.server {
                         diagnostics: bakedDiags
                     }, ConfigFileDiagEvent);
                     break;
-                case SurveyReady:
-                    const { surveyId } = event.data;
-                    this.event<protocol.SurveyReadyEventBody>({ surveyId }, SurveyReady);
-                    break;
                 case ProjectLanguageServiceStateEvent: {
                     const eventName: protocol.ProjectLanguageServiceStateEventName = ProjectLanguageServiceStateEvent;
                     this.event<protocol.ProjectLanguageServiceStateEventBody>({
diff --git a/src/testRunner/parallel/host.ts b/src/testRunner/parallel/host.ts
index 376896a4697..9adf9e7e850 100644
--- a/src/testRunner/parallel/host.ts
+++ b/src/testRunner/parallel/host.ts
@@ -302,6 +302,7 @@ namespace Harness.Parallel.Host {
                                 worker.timer = undefined;
                             }
                             else {
+                                // tslint:disable-next-line:ban
                                 worker.timer = setTimeout(killChild, data.payload.duration, data.payload);
                             }
                             break;
@@ -623,6 +624,7 @@ namespace Harness.Parallel.Host {
             shimNoopTestInterface(global);
         }
 
+        // tslint:disable-next-line:ban
         setTimeout(() => startDelayed(perfData, totalCost), 0); // Do real startup on next tick, so all unit tests have been collected
     }
 }
diff --git a/src/testRunner/tsconfig.json b/src/testRunner/tsconfig.json
index 154ded5883e..ee87ee3433e 100644
--- a/src/testRunner/tsconfig.json
+++ b/src/testRunner/tsconfig.json
@@ -117,7 +117,6 @@
         "unittests/tsserver/events/projectLanguageServiceState.ts",
         "unittests/tsserver/events/projectLoading.ts",
         "unittests/tsserver/events/projectUpdatedInBackground.ts",
-        "unittests/tsserver/events/surveyReady.ts",
         "unittests/tsserver/externalProjects.ts",
         "unittests/tsserver/forceConsistentCasingInFileNames.ts",
         "unittests/tsserver/formatSettings.ts",
diff --git a/src/testRunner/unittests/config/commandLineParsing.ts b/src/testRunner/unittests/config/commandLineParsing.ts
index a97784cb321..26a49df3dbb 100644
--- a/src/testRunner/unittests/config/commandLineParsing.ts
+++ b/src/testRunner/unittests/config/commandLineParsing.ts
@@ -57,7 +57,7 @@ namespace ts {
             assertParseResult(["--lib", "es5,invalidOption", "0.ts"],
                 {
                     errors: [{
-                        messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'esnext.array', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.bigint'.",
+                        messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.string', 'es2019.symbol', 'esnext.array', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.bigint'.",
                         category: Diagnostics.Argument_for_0_option_must_be_Colon_1.category,
                         code: Diagnostics.Argument_for_0_option_must_be_Colon_1.code,
                         file: undefined,
@@ -161,7 +161,7 @@ namespace ts {
                         start: undefined,
                         length: undefined,
                     }, {
-                            messageText: "Argument for '--target' option must be: 'es3', 'es5', 'es6', 'es2015', 'es2016', 'es2017', 'es2018', 'esnext'.",
+                            messageText: "Argument for '--target' option must be: 'es3', 'es5', 'es6', 'es2015', 'es2016', 'es2017', 'es2018', 'es2019', 'esnext'.",
                             category: Diagnostics.Argument_for_0_option_must_be_Colon_1.category,
                             code: Diagnostics.Argument_for_0_option_must_be_Colon_1.code,
 
@@ -259,7 +259,7 @@ namespace ts {
             assertParseResult(["--lib", "es5,", "es7", "0.ts"],
                 {
                     errors: [{
-                        messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'esnext.array', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.bigint'.",
+                        messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.string', 'es2019.symbol', 'esnext.array', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.bigint'.",
                         category: Diagnostics.Argument_for_0_option_must_be_Colon_1.category,
                         code: Diagnostics.Argument_for_0_option_must_be_Colon_1.code,
                         file: undefined,
@@ -278,7 +278,7 @@ namespace ts {
             assertParseResult(["--lib", "es5, ", "es7", "0.ts"],
                 {
                     errors: [{
-                        messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'esnext.array', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.bigint'.",
+                        messageText: "Argument for '--lib' option must be: 'es5', 'es6', 'es2015', 'es7', 'es2016', 'es2017', 'es2018', 'es2019', 'esnext', 'dom', 'dom.iterable', 'webworker', 'webworker.importscripts', 'scripthost', 'es2015.core', 'es2015.collection', 'es2015.generator', 'es2015.iterable', 'es2015.promise', 'es2015.proxy', 'es2015.reflect', 'es2015.symbol', 'es2015.symbol.wellknown', 'es2016.array.include', 'es2017.object', 'es2017.sharedmemory', 'es2017.string', 'es2017.intl', 'es2017.typedarrays', 'es2018.asynciterable', 'es2018.intl', 'es2018.promise', 'es2018.regexp', 'es2019.array', 'es2019.string', 'es2019.symbol', 'esnext.array', 'esnext.symbol', 'esnext.asynciterable', 'esnext.intl', 'esnext.bigint'.",
                         category: Diagnostics.Argument_for_0_option_must_be_Colon_1.category,
                         code: Diagnostics.Argument_for_0_option_must_be_Colon_1.code,
                         file: undefined,
diff --git a/src/testRunner/unittests/config/convertCompilerOptionsFromJson.ts b/src/testRunner/unittests/config/convertCompilerOptionsFromJson.ts
index 9f108676abb..b21f90eb448 100644
--- a/src/testRunner/unittests/config/convertCompilerOptionsFromJson.ts
+++ b/src/testRunner/unittests/config/convertCompilerOptionsFromJson.ts
@@ -238,7 +238,7 @@ namespace ts {
                         file: undefined,
                         start: 0,
                         length: 0,
-                        messageText: "Argument for '--target' option must be: 'es3', 'es5', 'es6', 'es2015', 'es2016', 'es2017', 'es2018', 'esnext'.",
+                        messageText: "Argument for '--target' option must be: 'es3', 'es5', 'es6', 'es2015', 'es2016', 'es2017', 'es2018', 'es2019', 'esnext'.",
                         code: Diagnostics.Argument_for_0_option_must_be_Colon_1.code,
                         category: Diagnostics.Argument_for_0_option_must_be_Colon_1.category
                     }]
diff --git a/src/testRunner/unittests/tsserver/events/surveyReady.ts b/src/testRunner/unittests/tsserver/events/surveyReady.ts
deleted file mode 100644
index b04746800d0..00000000000
--- a/src/testRunner/unittests/tsserver/events/surveyReady.ts
+++ /dev/null
@@ -1,111 +0,0 @@
-namespace ts.projectSystem {
-    describe("unittests:: tsserver:: events:: SurveyReady", () => {
-        function createSessionWithEventHandler(host: TestServerHost) {
-            const { session, events: surveyEvents } = createSessionWithEventTracking<server.SurveyReady>(host, server.SurveyReady);
-
-            return { session, verifySurveyReadyEvent };
-
-            function verifySurveyReadyEvent(numberOfEvents: number) {
-                assert.equal(surveyEvents.length, numberOfEvents);
-                const expectedEvents = numberOfEvents === 0 ? [] : [{
-                    eventName: server.SurveyReady,
-                    data: { surveyId: "checkJs" }
-                }];
-                assert.deepEqual(surveyEvents, expectedEvents);
-            }
-        }
-
-        it("doesn't log an event when checkJs isn't set", () => {
-            const projectRoot = "/user/username/projects/project";
-            const file: File = {
-                path: `${projectRoot}/src/file.ts`,
-                content: "export var y = 10;"
-            };
-            const tsconfig: File = {
-                path: `${projectRoot}/tsconfig.json`,
-                content: JSON.stringify({ compilerOptions: {} }),
-            };
-            const host = createServerHost([file, tsconfig]);
-            const { session, verifySurveyReadyEvent } = createSessionWithEventHandler(host);
-            const service = session.getProjectService();
-            openFilesForSession([file], session);
-            checkNumberOfProjects(service, { configuredProjects: 1 });
-            const project = service.configuredProjects.get(tsconfig.path)!;
-            checkProjectActualFiles(project, [file.path, tsconfig.path]);
-
-            verifySurveyReadyEvent(0);
-        });
-
-        it("logs an event when checkJs is set", () => {
-            const projectRoot = "/user/username/projects/project";
-            const file: File = {
-                path: `${projectRoot}/src/file.ts`,
-                content: "export var y = 10;"
-            };
-            const tsconfig: File = {
-                path: `${projectRoot}/tsconfig.json`,
-                content: JSON.stringify({ compilerOptions: { checkJs: true } }),
-            };
-            const host = createServerHost([file, tsconfig]);
-            const { session, verifySurveyReadyEvent } = createSessionWithEventHandler(host);
-            openFilesForSession([file], session);
-
-            verifySurveyReadyEvent(1);
-        });
-
-        it("logs an event when checkJs is set, only the first time", () => {
-            const projectRoot = "/user/username/projects/project";
-            const file: File = {
-                path: `${projectRoot}/src/file.ts`,
-                content: "export var y = 10;"
-            };
-            const rando: File = {
-                path: `/rando/calrissian.ts`,
-                content: "export function f() { }"
-            };
-            const tsconfig: File = {
-                path: `${projectRoot}/tsconfig.json`,
-                content: JSON.stringify({ compilerOptions: { checkJs: true } }),
-            };
-            const host = createServerHost([file, tsconfig]);
-            const { session, verifySurveyReadyEvent } = createSessionWithEventHandler(host);
-            openFilesForSession([file], session);
-
-            verifySurveyReadyEvent(1);
-
-            closeFilesForSession([file], session);
-            openFilesForSession([rando], session);
-            openFilesForSession([file], session);
-
-            verifySurveyReadyEvent(1);
-        });
-
-        it("logs an event when checkJs is set after closing and reopening", () => {
-            const projectRoot = "/user/username/projects/project";
-            const file: File = {
-                path: `${projectRoot}/src/file.ts`,
-                content: "export var y = 10;"
-            };
-            const rando: File = {
-                path: `/rando/calrissian.ts`,
-                content: "export function f() { }"
-            };
-            const tsconfig: File = {
-                path: `${projectRoot}/tsconfig.json`,
-                content: JSON.stringify({}),
-            };
-            const host = createServerHost([file, tsconfig]);
-            const { session, verifySurveyReadyEvent } = createSessionWithEventHandler(host);
-            openFilesForSession([file], session);
-
-            verifySurveyReadyEvent(0);
-
-            closeFilesForSession([file], session);
-            openFilesForSession([rando], session);
-            host.writeFile(tsconfig.path, JSON.stringify({ compilerOptions: { checkJs: true } }));
-            openFilesForSession([file], session);
-
-            verifySurveyReadyEvent(1);
-        });
-    });
-}
diff --git a/src/tsserver/server.ts b/src/tsserver/server.ts
index 21146958748..0dc57ca520a 100644
--- a/src/tsserver/server.ts
+++ b/src/tsserver/server.ts
@@ -705,6 +705,7 @@ namespace ts.server {
         // stat due to inconsistencies of fs.watch
         // and efficiency of stat on modern filesystems
         function startWatchTimer() {
+            // tslint:disable-next-line:ban
             setInterval(() => {
                 let count = 0;
                 let nextToCheck = nextFileToCheck;
diff --git a/tests/baselines/reference/api/tsserverlibrary.d.ts b/tests/baselines/reference/api/tsserverlibrary.d.ts
index f84f0cf8a4a..9e8e90726da 100644
--- a/tests/baselines/reference/api/tsserverlibrary.d.ts
+++ b/tests/baselines/reference/api/tsserverlibrary.d.ts
@@ -2612,9 +2612,10 @@ declare namespace ts {
         ES2016 = 3,
         ES2017 = 4,
         ES2018 = 5,
-        ESNext = 6,
+        ES2019 = 6,
+        ESNext = 7,
         JSON = 100,
-        Latest = 6
+        Latest = 7
     }
     enum LanguageVariant {
         Standard = 0,
@@ -8392,7 +8393,7 @@ declare namespace ts.server {
         excludedFiles: ReadonlyArray<NormalizedPath>;
         private typeAcquisition;
         updateGraph(): boolean;
-        getExcludedFiles(): ReadonlyArray<NormalizedPath>;
+        getExcludedFiles(): readonly NormalizedPath[];
         getTypeAcquisition(): TypeAcquisition;
         setTypeAcquisition(newTypeAcquisition: TypeAcquisition): void;
     }
@@ -8402,7 +8403,6 @@ declare namespace ts.server {
     const ProjectsUpdatedInBackgroundEvent = "projectsUpdatedInBackground";
     const ProjectLoadingStartEvent = "projectLoadingStart";
     const ProjectLoadingFinishEvent = "projectLoadingFinish";
-    const SurveyReady = "surveyReady";
     const LargeFileReferencedEvent = "largeFileReferenced";
     const ConfigFileDiagEvent = "configFileDiag";
     const ProjectLanguageServiceStateEvent = "projectLanguageServiceState";
@@ -8427,12 +8427,6 @@ declare namespace ts.server {
             project: Project;
         };
     }
-    interface SurveyReady {
-        eventName: typeof SurveyReady;
-        data: {
-            surveyId: string;
-        };
-    }
     interface LargeFileReferencedEvent {
         eventName: typeof LargeFileReferencedEvent;
         data: {
@@ -8517,7 +8511,7 @@ declare namespace ts.server {
     interface OpenFileInfo {
         readonly checkJs: boolean;
     }
-    type ProjectServiceEvent = LargeFileReferencedEvent | SurveyReady | ProjectsUpdatedInBackgroundEvent | ProjectLoadingStartEvent | ProjectLoadingFinishEvent | ConfigFileDiagEvent | ProjectLanguageServiceStateEvent | ProjectInfoTelemetryEvent | OpenFileInfoTelemetryEvent;
+    type ProjectServiceEvent = LargeFileReferencedEvent | ProjectsUpdatedInBackgroundEvent | ProjectLoadingStartEvent | ProjectLoadingFinishEvent | ConfigFileDiagEvent | ProjectLanguageServiceStateEvent | ProjectInfoTelemetryEvent | OpenFileInfoTelemetryEvent;
     type ProjectServiceEventHandler = (event: ProjectServiceEvent) => void;
     interface SafeList {
         [name: string]: {
@@ -8634,8 +8628,6 @@ declare namespace ts.server {
         readonly syntaxOnly?: boolean;
         /** Tracks projects that we have already sent telemetry for. */
         private readonly seenProjects;
-        /** Tracks projects that we have already sent survey events for. */
-        private readonly seenSurveyProjects;
         constructor(opts: ProjectServiceOptions);
         toPath(fileName: string): Path;
         private loadTypesMap;
diff --git a/tests/baselines/reference/api/typescript.d.ts b/tests/baselines/reference/api/typescript.d.ts
index 5e543430ca8..d7619ffc407 100644
--- a/tests/baselines/reference/api/typescript.d.ts
+++ b/tests/baselines/reference/api/typescript.d.ts
@@ -2612,9 +2612,10 @@ declare namespace ts {
         ES2016 = 3,
         ES2017 = 4,
         ES2018 = 5,
-        ESNext = 6,
+        ES2019 = 6,
+        ESNext = 7,
         JSON = 100,
-        Latest = 6
+        Latest = 7
     }
     enum LanguageVariant {
         Standard = 0,
diff --git a/tests/baselines/reference/arrayFlatMap.symbols b/tests/baselines/reference/arrayFlatMap.symbols
index 0a97341657b..b3a8d55721a 100644
--- a/tests/baselines/reference/arrayFlatMap.symbols
+++ b/tests/baselines/reference/arrayFlatMap.symbols
@@ -4,17 +4,17 @@ const array: number[] = [];
 
 const readonlyArray: ReadonlyArray<number> = [];
 >readonlyArray : Symbol(readonlyArray, Decl(arrayFlatMap.ts, 1, 5))
->ReadonlyArray : Symbol(ReadonlyArray, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
+>ReadonlyArray : Symbol(ReadonlyArray, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es2019.array.d.ts, --, --))
 
 array.flatMap((): ReadonlyArray<number> => []); // ok
->array.flatMap : Symbol(Array.flatMap, Decl(lib.esnext.array.d.ts, --, --))
+>array.flatMap : Symbol(Array.flatMap, Decl(lib.es2019.array.d.ts, --, --))
 >array : Symbol(array, Decl(arrayFlatMap.ts, 0, 5))
->flatMap : Symbol(Array.flatMap, Decl(lib.esnext.array.d.ts, --, --))
->ReadonlyArray : Symbol(ReadonlyArray, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
+>flatMap : Symbol(Array.flatMap, Decl(lib.es2019.array.d.ts, --, --))
+>ReadonlyArray : Symbol(ReadonlyArray, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es2019.array.d.ts, --, --))
 
 readonlyArray.flatMap((): ReadonlyArray<number> => []); // ok
->readonlyArray.flatMap : Symbol(ReadonlyArray.flatMap, Decl(lib.esnext.array.d.ts, --, --))
+>readonlyArray.flatMap : Symbol(ReadonlyArray.flatMap, Decl(lib.es2019.array.d.ts, --, --))
 >readonlyArray : Symbol(readonlyArray, Decl(arrayFlatMap.ts, 1, 5))
->flatMap : Symbol(ReadonlyArray.flatMap, Decl(lib.esnext.array.d.ts, --, --))
->ReadonlyArray : Symbol(ReadonlyArray, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.esnext.array.d.ts, --, --))
+>flatMap : Symbol(ReadonlyArray.flatMap, Decl(lib.es2019.array.d.ts, --, --))
+>ReadonlyArray : Symbol(ReadonlyArray, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es2019.array.d.ts, --, --))
 
diff --git a/tests/baselines/reference/bigintIndex.symbols b/tests/baselines/reference/bigintIndex.symbols
index c115a0f9daf..dff23a016ee 100644
--- a/tests/baselines/reference/bigintIndex.symbols
+++ b/tests/baselines/reference/bigintIndex.symbols
@@ -34,7 +34,7 @@ key = "abc";
 
 key = Symbol();
 >key : Symbol(key, Decl(a.ts, 9, 3))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 
 key = 123n; // should error
 >key : Symbol(key, Decl(a.ts, 9, 3))
@@ -53,7 +53,7 @@ typedArray[bigNum] = 0xAA; // should error
 
 typedArray[String(bigNum)] = 0xAA;
 >typedArray : Symbol(typedArray, Decl(a.ts, 17, 5))
->String : Symbol(String, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --) ... and 2 more)
+>String : Symbol(String, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --) ... and 3 more)
 >bigNum : Symbol(bigNum, Decl(a.ts, 16, 5))
 
 typedArray["1"] = 0xBB;
diff --git a/tests/baselines/reference/conditionalTypeDoesntSpinForever.types b/tests/baselines/reference/conditionalTypeDoesntSpinForever.types
index d4fe4bf4826..1f4b4a62cd2 100644
--- a/tests/baselines/reference/conditionalTypeDoesntSpinForever.types
+++ b/tests/baselines/reference/conditionalTypeDoesntSpinForever.types
@@ -120,9 +120,9 @@ export enum PubSubRecordIsStoredInRedisAsA {
 
         buildPubSubRecordType(Object.assign({}, soFar, {storedAs: PubSubRecordIsStoredInRedisAsA.jsonEncodedRedisString})) as
 >buildPubSubRecordType(Object.assign({}, soFar, {storedAs: PubSubRecordIsStoredInRedisAsA.jsonEncodedRedisString})) as          BuildPubSubRecordType<SO_FAR & {storedAs: PubSubRecordIsStoredInRedisAsA.jsonEncodedRedisString}> : BuildPubSubRecordType<SO_FAR & { storedAs: PubSubRecordIsStoredInRedisAsA.jsonEncodedRedisString; }>
->buildPubSubRecordType(Object.assign({}, soFar, {storedAs: PubSubRecordIsStoredInRedisAsA.jsonEncodedRedisString})) : BuildPubSubRecordType<SO_FAR & { storedAs: PubSubRecordIsStoredInRedisAsA; }>
+>buildPubSubRecordType(Object.assign({}, soFar, {storedAs: PubSubRecordIsStoredInRedisAsA.jsonEncodedRedisString})) : BuildPubSubRecordType<SO_FAR & { storedAs: PubSubRecordIsStoredInRedisAsA.jsonEncodedRedisString; }>
 >buildPubSubRecordType : <SO_FAR>(soFar: SO_FAR) => BuildPubSubRecordType<SO_FAR>
->Object.assign({}, soFar, {storedAs: PubSubRecordIsStoredInRedisAsA.jsonEncodedRedisString}) : SO_FAR & { storedAs: PubSubRecordIsStoredInRedisAsA; }
+>Object.assign({}, soFar, {storedAs: PubSubRecordIsStoredInRedisAsA.jsonEncodedRedisString}) : SO_FAR & { storedAs: PubSubRecordIsStoredInRedisAsA.jsonEncodedRedisString; }
 >Object.assign : { <T, U>(target: T, source: U): T & U; <T, U, V>(target: T, source1: U, source2: V): T & U & V; <T, U, V, W>(target: T, source1: U, source2: V, source3: W): T & U & V & W; (target: object, ...sources: any[]): any; }
 >Object : ObjectConstructor
 >assign : { <T, U>(target: T, source: U): T & U; <T, U, V>(target: T, source1: U, source2: V): T & U & V; <T, U, V, W>(target: T, source1: U, source2: V, source3: W): T & U & V & W; (target: object, ...sources: any[]): any; }
@@ -144,9 +144,9 @@ export enum PubSubRecordIsStoredInRedisAsA {
 
         buildPubSubRecordType(Object.assign({}, soFar, {storedAs: PubSubRecordIsStoredInRedisAsA.redisHash})) as
 >buildPubSubRecordType(Object.assign({}, soFar, {storedAs: PubSubRecordIsStoredInRedisAsA.redisHash})) as          BuildPubSubRecordType<SO_FAR & {storedAs: PubSubRecordIsStoredInRedisAsA.redisHash}> : BuildPubSubRecordType<SO_FAR & { storedAs: PubSubRecordIsStoredInRedisAsA.redisHash; }>
->buildPubSubRecordType(Object.assign({}, soFar, {storedAs: PubSubRecordIsStoredInRedisAsA.redisHash})) : BuildPubSubRecordType<SO_FAR & { storedAs: PubSubRecordIsStoredInRedisAsA; }>
+>buildPubSubRecordType(Object.assign({}, soFar, {storedAs: PubSubRecordIsStoredInRedisAsA.redisHash})) : BuildPubSubRecordType<SO_FAR & { storedAs: PubSubRecordIsStoredInRedisAsA.redisHash; }>
 >buildPubSubRecordType : <SO_FAR>(soFar: SO_FAR) => BuildPubSubRecordType<SO_FAR>
->Object.assign({}, soFar, {storedAs: PubSubRecordIsStoredInRedisAsA.redisHash}) : SO_FAR & { storedAs: PubSubRecordIsStoredInRedisAsA; }
+>Object.assign({}, soFar, {storedAs: PubSubRecordIsStoredInRedisAsA.redisHash}) : SO_FAR & { storedAs: PubSubRecordIsStoredInRedisAsA.redisHash; }
 >Object.assign : { <T, U>(target: T, source: U): T & U; <T, U, V>(target: T, source1: U, source2: V): T & U & V; <T, U, V, W>(target: T, source1: U, source2: V, source3: W): T & U & V & W; (target: object, ...sources: any[]): any; }
 >Object : ObjectConstructor
 >assign : { <T, U>(target: T, source: U): T & U; <T, U, V>(target: T, source1: U, source2: V): T & U & V; <T, U, V, W>(target: T, source1: U, source2: V, source3: W): T & U & V & W; (target: object, ...sources: any[]): any; }
@@ -337,16 +337,16 @@ export enum PubSubRecordIsStoredInRedisAsA {
 
         buildPubSubRecordType(Object.assign({}, soFar, {maxMsToWaitBeforePublishing: 0})) as BuildPubSubRecordType<SO_FAR & {maxMsToWaitBeforePublishing: 0}>,
 >buildPubSubRecordType(Object.assign({}, soFar, {maxMsToWaitBeforePublishing: 0})) as BuildPubSubRecordType<SO_FAR & {maxMsToWaitBeforePublishing: 0}> : BuildPubSubRecordType<SO_FAR & { maxMsToWaitBeforePublishing: 0; }>
->buildPubSubRecordType(Object.assign({}, soFar, {maxMsToWaitBeforePublishing: 0})) : BuildPubSubRecordType<SO_FAR & { maxMsToWaitBeforePublishing: number; }>
+>buildPubSubRecordType(Object.assign({}, soFar, {maxMsToWaitBeforePublishing: 0})) : BuildPubSubRecordType<SO_FAR & { maxMsToWaitBeforePublishing: 0; }>
 >buildPubSubRecordType : <SO_FAR>(soFar: SO_FAR) => BuildPubSubRecordType<SO_FAR>
->Object.assign({}, soFar, {maxMsToWaitBeforePublishing: 0}) : SO_FAR & { maxMsToWaitBeforePublishing: number; }
+>Object.assign({}, soFar, {maxMsToWaitBeforePublishing: 0}) : SO_FAR & { maxMsToWaitBeforePublishing: 0; }
 >Object.assign : { <T, U>(target: T, source: U): T & U; <T, U, V>(target: T, source1: U, source2: V): T & U & V; <T, U, V, W>(target: T, source1: U, source2: V, source3: W): T & U & V & W; (target: object, ...sources: any[]): any; }
 >Object : ObjectConstructor
 >assign : { <T, U>(target: T, source: U): T & U; <T, U, V>(target: T, source1: U, source2: V): T & U & V; <T, U, V, W>(target: T, source1: U, source2: V, source3: W): T & U & V & W; (target: object, ...sources: any[]): any; }
 >{} : {}
 >soFar : SO_FAR
->{maxMsToWaitBeforePublishing: 0} : { maxMsToWaitBeforePublishing: number; }
->maxMsToWaitBeforePublishing : number
+>{maxMsToWaitBeforePublishing: 0} : { maxMsToWaitBeforePublishing: 0; }
+>maxMsToWaitBeforePublishing : 0
 >0 : 0
 >maxMsToWaitBeforePublishing : 0
     }
diff --git a/tests/baselines/reference/conditionalTypes2.errors.txt b/tests/baselines/reference/conditionalTypes2.errors.txt
index a1a23b6da18..343a0a8412c 100644
--- a/tests/baselines/reference/conditionalTypes2.errors.txt
+++ b/tests/baselines/reference/conditionalTypes2.errors.txt
@@ -1,29 +1,38 @@
-tests/cases/conformance/types/conditional/conditionalTypes2.ts(15,5): error TS2322: Type 'Covariant<A>' is not assignable to type 'Covariant<B>'.
-  Type 'A' is not assignable to type 'B'.
-tests/cases/conformance/types/conditional/conditionalTypes2.ts(19,5): error TS2322: Type 'Contravariant<B>' is not assignable to type 'Contravariant<A>'.
-  Type 'A' is not assignable to type 'B'.
-tests/cases/conformance/types/conditional/conditionalTypes2.ts(24,5): error TS2322: Type 'Invariant<B>' is not assignable to type 'Invariant<A>'.
+tests/cases/conformance/types/conditional/conditionalTypes2.ts(16,5): error TS2322: Type 'Covariant<B>' is not assignable to type 'Covariant<A>'.
+  Types of property 'foo' are incompatible.
+    Type 'B extends string ? B : number' is not assignable to type 'A extends string ? A : number'.
+tests/cases/conformance/types/conditional/conditionalTypes2.ts(17,5): error TS2322: Type 'Covariant<A>' is not assignable to type 'Covariant<B>'.
+  Types of property 'foo' are incompatible.
+    Type 'A extends string ? A : number' is not assignable to type 'B extends string ? B : number'.
+tests/cases/conformance/types/conditional/conditionalTypes2.ts(21,5): error TS2322: Type 'Contravariant<B>' is not assignable to type 'Contravariant<A>'.
+  Types of property 'foo' are incompatible.
+    Type 'B extends string ? keyof B : number' is not assignable to type 'A extends string ? keyof A : number'.
+tests/cases/conformance/types/conditional/conditionalTypes2.ts(22,5): error TS2322: Type 'Contravariant<A>' is not assignable to type 'Contravariant<B>'.
+  Types of property 'foo' are incompatible.
+    Type 'A extends string ? keyof A : number' is not assignable to type 'B extends string ? keyof B : number'.
+tests/cases/conformance/types/conditional/conditionalTypes2.ts(26,5): error TS2322: Type 'Invariant<B>' is not assignable to type 'Invariant<A>'.
   Types of property 'foo' are incompatible.
     Type 'B extends string ? keyof B : B' is not assignable to type 'A extends string ? keyof A : A'.
-      Type 'keyof B' is not assignable to type 'keyof A'.
-        Type 'string | number | symbol' is not assignable to type 'keyof A'.
-          Type 'string' is not assignable to type 'keyof A'.
-tests/cases/conformance/types/conditional/conditionalTypes2.ts(25,5): error TS2322: Type 'Invariant<A>' is not assignable to type 'Invariant<B>'.
+tests/cases/conformance/types/conditional/conditionalTypes2.ts(27,5): error TS2322: Type 'Invariant<A>' is not assignable to type 'Invariant<B>'.
   Types of property 'foo' are incompatible.
     Type 'A extends string ? keyof A : A' is not assignable to type 'B extends string ? keyof B : B'.
-      Type 'A' is not assignable to type 'B'.
-tests/cases/conformance/types/conditional/conditionalTypes2.ts(73,12): error TS2345: Argument of type 'Extract<Extract<T, Foo>, Bar>' is not assignable to parameter of type '{ foo: string; bat: string; }'.
+tests/cases/conformance/types/conditional/conditionalTypes2.ts(75,12): error TS2345: Argument of type 'Extract<Extract<T, Foo>, Bar>' is not assignable to parameter of type '{ foo: string; bat: string; }'.
   Property 'bat' is missing in type 'Bar & Foo' but required in type '{ foo: string; bat: string; }'.
     Type 'Extract<Foo & T, Bar>' is not assignable to type '{ foo: string; bat: string; }'.
       Property 'bat' is missing in type 'Bar & Foo' but required in type '{ foo: string; bat: string; }'.
-tests/cases/conformance/types/conditional/conditionalTypes2.ts(74,12): error TS2345: Argument of type 'Extract<T, Foo & Bar>' is not assignable to parameter of type '{ foo: string; bat: string; }'.
+tests/cases/conformance/types/conditional/conditionalTypes2.ts(76,12): error TS2345: Argument of type 'Extract<T, Foo & Bar>' is not assignable to parameter of type '{ foo: string; bat: string; }'.
   Property 'bat' is missing in type 'Foo & Bar' but required in type '{ foo: string; bat: string; }'.
-tests/cases/conformance/types/conditional/conditionalTypes2.ts(75,12): error TS2345: Argument of type 'Extract2<T, Foo, Bar>' is not assignable to parameter of type '{ foo: string; bat: string; }'.
+tests/cases/conformance/types/conditional/conditionalTypes2.ts(77,12): error TS2345: Argument of type 'Extract2<T, Foo, Bar>' is not assignable to parameter of type '{ foo: string; bat: string; }'.
   Type 'T extends Bar ? T : never' is not assignable to type '{ foo: string; bat: string; }'.
     Type 'Bar & Foo & T' is not assignable to type '{ foo: string; bat: string; }'.
+tests/cases/conformance/types/conditional/conditionalTypes2.ts(165,5): error TS2322: Type 'MyElement<A>' is not assignable to type 'MyElement<B>'.
+tests/cases/conformance/types/conditional/conditionalTypes2.ts(170,5): error TS2322: Type 'MyAcceptor<B>' is not assignable to type 'MyAcceptor<A>'.
+tests/cases/conformance/types/conditional/conditionalTypes2.ts(177,5): error TS2322: Type 'Dist<T>' is not assignable to type 'Aux<{ a: T; }>'.
 
 
-==== tests/cases/conformance/types/conditional/conditionalTypes2.ts (7 errors) ====
+==== tests/cases/conformance/types/conditional/conditionalTypes2.ts (12 errors) ====
+    // #27118: Conditional types are now invariant in the check type.
+    
     interface Covariant<T> {
         foo: T extends string ? T : number;
     }
@@ -37,19 +46,29 @@ tests/cases/conformance/types/conditional/conditionalTypes2.ts(75,12): error TS2
     }
     
     function f1<A, B extends A>(a: Covariant<A>, b: Covariant<B>) {
-        a = b;
+        a = b;  // Error
+        ~
+!!! error TS2322: Type 'Covariant<B>' is not assignable to type 'Covariant<A>'.
+!!! error TS2322:   Types of property 'foo' are incompatible.
+!!! error TS2322:     Type 'B extends string ? B : number' is not assignable to type 'A extends string ? A : number'.
         b = a;  // Error
         ~
 !!! error TS2322: Type 'Covariant<A>' is not assignable to type 'Covariant<B>'.
-!!! error TS2322:   Type 'A' is not assignable to type 'B'.
+!!! error TS2322:   Types of property 'foo' are incompatible.
+!!! error TS2322:     Type 'A extends string ? A : number' is not assignable to type 'B extends string ? B : number'.
     }
     
     function f2<A, B extends A>(a: Contravariant<A>, b: Contravariant<B>) {
         a = b;  // Error
         ~
 !!! error TS2322: Type 'Contravariant<B>' is not assignable to type 'Contravariant<A>'.
-!!! error TS2322:   Type 'A' is not assignable to type 'B'.
-        b = a;
+!!! error TS2322:   Types of property 'foo' are incompatible.
+!!! error TS2322:     Type 'B extends string ? keyof B : number' is not assignable to type 'A extends string ? keyof A : number'.
+        b = a;  // Error
+        ~
+!!! error TS2322: Type 'Contravariant<A>' is not assignable to type 'Contravariant<B>'.
+!!! error TS2322:   Types of property 'foo' are incompatible.
+!!! error TS2322:     Type 'A extends string ? keyof A : number' is not assignable to type 'B extends string ? keyof B : number'.
     }
     
     function f3<A, B extends A>(a: Invariant<A>, b: Invariant<B>) {
@@ -58,15 +77,11 @@ tests/cases/conformance/types/conditional/conditionalTypes2.ts(75,12): error TS2
 !!! error TS2322: Type 'Invariant<B>' is not assignable to type 'Invariant<A>'.
 !!! error TS2322:   Types of property 'foo' are incompatible.
 !!! error TS2322:     Type 'B extends string ? keyof B : B' is not assignable to type 'A extends string ? keyof A : A'.
-!!! error TS2322:       Type 'keyof B' is not assignable to type 'keyof A'.
-!!! error TS2322:         Type 'string | number | symbol' is not assignable to type 'keyof A'.
-!!! error TS2322:           Type 'string' is not assignable to type 'keyof A'.
         b = a;  // Error
         ~
 !!! error TS2322: Type 'Invariant<A>' is not assignable to type 'Invariant<B>'.
 !!! error TS2322:   Types of property 'foo' are incompatible.
 !!! error TS2322:     Type 'A extends string ? keyof A : A' is not assignable to type 'B extends string ? keyof B : B'.
-!!! error TS2322:       Type 'A' is not assignable to type 'B'.
     }
     
     // Extract<T, Function> is a T that is known to be a Function
@@ -120,13 +135,13 @@ tests/cases/conformance/types/conditional/conditionalTypes2.ts(75,12): error TS2
 !!! error TS2345:   Property 'bat' is missing in type 'Bar & Foo' but required in type '{ foo: string; bat: string; }'.
 !!! error TS2345:     Type 'Extract<Foo & T, Bar>' is not assignable to type '{ foo: string; bat: string; }'.
 !!! error TS2345:       Property 'bat' is missing in type 'Bar & Foo' but required in type '{ foo: string; bat: string; }'.
-!!! related TS2728 tests/cases/conformance/types/conditional/conditionalTypes2.ts:62:43: 'bat' is declared here.
-!!! related TS2728 tests/cases/conformance/types/conditional/conditionalTypes2.ts:62:43: 'bat' is declared here.
+!!! related TS2728 tests/cases/conformance/types/conditional/conditionalTypes2.ts:64:43: 'bat' is declared here.
+!!! related TS2728 tests/cases/conformance/types/conditional/conditionalTypes2.ts:64:43: 'bat' is declared here.
         fooBat(y);  // Error
                ~
 !!! error TS2345: Argument of type 'Extract<T, Foo & Bar>' is not assignable to parameter of type '{ foo: string; bat: string; }'.
 !!! error TS2345:   Property 'bat' is missing in type 'Foo & Bar' but required in type '{ foo: string; bat: string; }'.
-!!! related TS2728 tests/cases/conformance/types/conditional/conditionalTypes2.ts:62:43: 'bat' is declared here.
+!!! related TS2728 tests/cases/conformance/types/conditional/conditionalTypes2.ts:64:43: 'bat' is declared here.
         fooBat(z);  // Error
                ~
 !!! error TS2345: Argument of type 'Extract2<T, Foo, Bar>' is not assignable to parameter of type '{ foo: string; bat: string; }'.
@@ -134,38 +149,6 @@ tests/cases/conformance/types/conditional/conditionalTypes2.ts(75,12): error TS2
 !!! error TS2345:     Type 'Bar & Foo & T' is not assignable to type '{ foo: string; bat: string; }'.
     }
     
-    // Repros from #22860
-    
-    class Opt<T> {
-        toVector(): Vector<T> {
-            return <any>undefined;
-        }
-    }
-    
-    interface Seq<T> {
-        tail(): Opt<Seq<T>>;
-    }
-    
-    class Vector<T> implements Seq<T> {
-        tail(): Opt<Vector<T>> {
-            return <any>undefined;
-        }
-        partition2<U extends T>(predicate:(v:T)=>v is U): [Vector<U>,Vector<Exclude<T, U>>];
-        partition2(predicate:(x:T)=>boolean): [Vector<T>,Vector<T>];
-        partition2<U extends T>(predicate:(v:T)=>boolean): [Vector<U>,Vector<any>] {
-            return <any>undefined;
-        }
-    }
-    
-    interface A1<T> {
-        bat: B1<A1<T>>;
-    }
-    
-    interface B1<T> extends A1<T> {
-        bat: B1<B1<T>>;
-        boom: T extends any ? true : true
-    }
-    
     // Repro from #22899
     
     declare function toString1(value: object | Function): string ;
@@ -246,4 +229,29 @@ tests/cases/conformance/types/conditional/conditionalTypes2.ts(75,12): error TS2
     };
     type PCCA = ProductComplementComplement['a'];
     type PCCB = ProductComplementComplement['b'];
+    
+    // Repros from #27118
+    
+    type MyElement<A> = [A] extends [[infer E]] ? E : never;
+    function oops<A, B extends A>(arg: MyElement<A>): MyElement<B> {
+        return arg;  // Unsound, should be error
+        ~~~~~~~~~~~
+!!! error TS2322: Type 'MyElement<A>' is not assignable to type 'MyElement<B>'.
+    }
+    
+    type MyAcceptor<A> = [A] extends [[infer E]] ? (arg: E) => void : never;
+    function oops2<A, B extends A>(arg: MyAcceptor<B>): MyAcceptor<A> {
+        return arg;  // Unsound, should be error
+        ~~~~~~~~~~~
+!!! error TS2322: Type 'MyAcceptor<B>' is not assignable to type 'MyAcceptor<A>'.
+    }
+    
+    type Dist<T> = T extends number ? number : string;
+    type Aux<A extends { a: unknown }> = A["a"] extends number ? number : string;
+    type Nondist<T> = Aux<{a: T}>;
+    function oops3<T>(arg: Dist<T>): Nondist<T> {
+        return arg;  // Unsound, should be error
+        ~~~~~~~~~~~
+!!! error TS2322: Type 'Dist<T>' is not assignable to type 'Aux<{ a: T; }>'.
+    }
     
\ No newline at end of file
diff --git a/tests/baselines/reference/conditionalTypes2.js b/tests/baselines/reference/conditionalTypes2.js
index 4f4f35e821a..c59c996711d 100644
--- a/tests/baselines/reference/conditionalTypes2.js
+++ b/tests/baselines/reference/conditionalTypes2.js
@@ -1,4 +1,6 @@
 //// [conditionalTypes2.ts]
+// #27118: Conditional types are now invariant in the check type.
+
 interface Covariant<T> {
     foo: T extends string ? T : number;
 }
@@ -12,13 +14,13 @@ interface Invariant<T> {
 }
 
 function f1<A, B extends A>(a: Covariant<A>, b: Covariant<B>) {
-    a = b;
+    a = b;  // Error
     b = a;  // Error
 }
 
 function f2<A, B extends A>(a: Contravariant<A>, b: Contravariant<B>) {
     a = b;  // Error
-    b = a;
+    b = a;  // Error
 }
 
 function f3<A, B extends A>(a: Invariant<A>, b: Invariant<B>) {
@@ -76,38 +78,6 @@ function f21<T>(x: Extract<Extract<T, Foo>, Bar>, y: Extract<T, Foo & Bar>, z: E
     fooBat(z);  // Error
 }
 
-// Repros from #22860
-
-class Opt<T> {
-    toVector(): Vector<T> {
-        return <any>undefined;
-    }
-}
-
-interface Seq<T> {
-    tail(): Opt<Seq<T>>;
-}
-
-class Vector<T> implements Seq<T> {
-    tail(): Opt<Vector<T>> {
-        return <any>undefined;
-    }
-    partition2<U extends T>(predicate:(v:T)=>v is U): [Vector<U>,Vector<Exclude<T, U>>];
-    partition2(predicate:(x:T)=>boolean): [Vector<T>,Vector<T>];
-    partition2<U extends T>(predicate:(v:T)=>boolean): [Vector<U>,Vector<any>] {
-        return <any>undefined;
-    }
-}
-
-interface A1<T> {
-    bat: B1<A1<T>>;
-}
-
-interface B1<T> extends A1<T> {
-    bat: B1<B1<T>>;
-    boom: T extends any ? true : true
-}
-
 // Repro from #22899
 
 declare function toString1(value: object | Function): string ;
@@ -188,17 +158,37 @@ type ProductComplementComplement = {
 };
 type PCCA = ProductComplementComplement['a'];
 type PCCB = ProductComplementComplement['b'];
+
+// Repros from #27118
+
+type MyElement<A> = [A] extends [[infer E]] ? E : never;
+function oops<A, B extends A>(arg: MyElement<A>): MyElement<B> {
+    return arg;  // Unsound, should be error
+}
+
+type MyAcceptor<A> = [A] extends [[infer E]] ? (arg: E) => void : never;
+function oops2<A, B extends A>(arg: MyAcceptor<B>): MyAcceptor<A> {
+    return arg;  // Unsound, should be error
+}
+
+type Dist<T> = T extends number ? number : string;
+type Aux<A extends { a: unknown }> = A["a"] extends number ? number : string;
+type Nondist<T> = Aux<{a: T}>;
+function oops3<T>(arg: Dist<T>): Nondist<T> {
+    return arg;  // Unsound, should be error
+}
 
 
 //// [conditionalTypes2.js]
 "use strict";
+// #27118: Conditional types are now invariant in the check type.
 function f1(a, b) {
-    a = b;
+    a = b; // Error
     b = a; // Error
 }
 function f2(a, b) {
     a = b; // Error
-    b = a;
+    b = a; // Error
 }
 function f3(a, b) {
     a = b; // Error
@@ -239,32 +229,21 @@ function f21(x, y, z) {
     fooBat(y); // Error
     fooBat(z); // Error
 }
-// Repros from #22860
-var Opt = /** @class */ (function () {
-    function Opt() {
-    }
-    Opt.prototype.toVector = function () {
-        return undefined;
-    };
-    return Opt;
-}());
-var Vector = /** @class */ (function () {
-    function Vector() {
-    }
-    Vector.prototype.tail = function () {
-        return undefined;
-    };
-    Vector.prototype.partition2 = function (predicate) {
-        return undefined;
-    };
-    return Vector;
-}());
 function foo(value) {
     if (isFunction(value)) {
         toString1(value);
         toString2(value);
     }
 }
+function oops(arg) {
+    return arg; // Unsound, should be error
+}
+function oops2(arg) {
+    return arg; // Unsound, should be error
+}
+function oops3(arg) {
+    return arg; // Unsound, should be error
+}
 
 
 //// [conditionalTypes2.d.ts]
@@ -302,24 +281,6 @@ declare function fooBat(x: {
 declare type Extract2<T, U, V> = T extends U ? T extends V ? T : never : never;
 declare function f20<T>(x: Extract<Extract<T, Foo>, Bar>, y: Extract<T, Foo & Bar>, z: Extract2<T, Foo, Bar>): void;
 declare function f21<T>(x: Extract<Extract<T, Foo>, Bar>, y: Extract<T, Foo & Bar>, z: Extract2<T, Foo, Bar>): void;
-declare class Opt<T> {
-    toVector(): Vector<T>;
-}
-interface Seq<T> {
-    tail(): Opt<Seq<T>>;
-}
-declare class Vector<T> implements Seq<T> {
-    tail(): Opt<Vector<T>>;
-    partition2<U extends T>(predicate: (v: T) => v is U): [Vector<U>, Vector<Exclude<T, U>>];
-    partition2(predicate: (x: T) => boolean): [Vector<T>, Vector<T>];
-}
-interface A1<T> {
-    bat: B1<A1<T>>;
-}
-interface B1<T> extends A1<T> {
-    bat: B1<B1<T>>;
-    boom: T extends any ? true : true;
-}
 declare function toString1(value: object | Function): string;
 declare function toString2(value: Function): string;
 declare function foo<T>(value: T): void;
@@ -392,3 +353,15 @@ declare type ProductComplementComplement = {
 };
 declare type PCCA = ProductComplementComplement['a'];
 declare type PCCB = ProductComplementComplement['b'];
+declare type MyElement<A> = [A] extends [[infer E]] ? E : never;
+declare function oops<A, B extends A>(arg: MyElement<A>): MyElement<B>;
+declare type MyAcceptor<A> = [A] extends [[infer E]] ? (arg: E) => void : never;
+declare function oops2<A, B extends A>(arg: MyAcceptor<B>): MyAcceptor<A>;
+declare type Dist<T> = T extends number ? number : string;
+declare type Aux<A extends {
+    a: unknown;
+}> = A["a"] extends number ? number : string;
+declare type Nondist<T> = Aux<{
+    a: T;
+}>;
+declare function oops3<T>(arg: Dist<T>): Nondist<T>;
diff --git a/tests/baselines/reference/conditionalTypes2.symbols b/tests/baselines/reference/conditionalTypes2.symbols
index b164d26e450..7bbf837eece 100644
--- a/tests/baselines/reference/conditionalTypes2.symbols
+++ b/tests/baselines/reference/conditionalTypes2.symbols
@@ -1,687 +1,655 @@
 === tests/cases/conformance/types/conditional/conditionalTypes2.ts ===
+// #27118: Conditional types are now invariant in the check type.
+
 interface Covariant<T> {
 >Covariant : Symbol(Covariant, Decl(conditionalTypes2.ts, 0, 0))
->T : Symbol(T, Decl(conditionalTypes2.ts, 0, 20))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 2, 20))
 
     foo: T extends string ? T : number;
->foo : Symbol(Covariant.foo, Decl(conditionalTypes2.ts, 0, 24))
->T : Symbol(T, Decl(conditionalTypes2.ts, 0, 20))
->T : Symbol(T, Decl(conditionalTypes2.ts, 0, 20))
+>foo : Symbol(Covariant.foo, Decl(conditionalTypes2.ts, 2, 24))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 2, 20))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 2, 20))
 }
 
 interface Contravariant<T> {
->Contravariant : Symbol(Contravariant, Decl(conditionalTypes2.ts, 2, 1))
->T : Symbol(T, Decl(conditionalTypes2.ts, 4, 24))
+>Contravariant : Symbol(Contravariant, Decl(conditionalTypes2.ts, 4, 1))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 6, 24))
 
     foo: T extends string ? keyof T : number;
->foo : Symbol(Contravariant.foo, Decl(conditionalTypes2.ts, 4, 28))
->T : Symbol(T, Decl(conditionalTypes2.ts, 4, 24))
->T : Symbol(T, Decl(conditionalTypes2.ts, 4, 24))
+>foo : Symbol(Contravariant.foo, Decl(conditionalTypes2.ts, 6, 28))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 6, 24))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 6, 24))
 }
 
 interface Invariant<T> {
->Invariant : Symbol(Invariant, Decl(conditionalTypes2.ts, 6, 1))
->T : Symbol(T, Decl(conditionalTypes2.ts, 8, 20))
+>Invariant : Symbol(Invariant, Decl(conditionalTypes2.ts, 8, 1))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 10, 20))
 
     foo: T extends string ? keyof T : T;
->foo : Symbol(Invariant.foo, Decl(conditionalTypes2.ts, 8, 24))
->T : Symbol(T, Decl(conditionalTypes2.ts, 8, 20))
->T : Symbol(T, Decl(conditionalTypes2.ts, 8, 20))
->T : Symbol(T, Decl(conditionalTypes2.ts, 8, 20))
+>foo : Symbol(Invariant.foo, Decl(conditionalTypes2.ts, 10, 24))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 10, 20))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 10, 20))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 10, 20))
 }
 
 function f1<A, B extends A>(a: Covariant<A>, b: Covariant<B>) {
->f1 : Symbol(f1, Decl(conditionalTypes2.ts, 10, 1))
->A : Symbol(A, Decl(conditionalTypes2.ts, 12, 12))
->B : Symbol(B, Decl(conditionalTypes2.ts, 12, 14))
->A : Symbol(A, Decl(conditionalTypes2.ts, 12, 12))
->a : Symbol(a, Decl(conditionalTypes2.ts, 12, 28))
+>f1 : Symbol(f1, Decl(conditionalTypes2.ts, 12, 1))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 14, 12))
+>B : Symbol(B, Decl(conditionalTypes2.ts, 14, 14))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 14, 12))
+>a : Symbol(a, Decl(conditionalTypes2.ts, 14, 28))
 >Covariant : Symbol(Covariant, Decl(conditionalTypes2.ts, 0, 0))
->A : Symbol(A, Decl(conditionalTypes2.ts, 12, 12))
->b : Symbol(b, Decl(conditionalTypes2.ts, 12, 44))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 14, 12))
+>b : Symbol(b, Decl(conditionalTypes2.ts, 14, 44))
 >Covariant : Symbol(Covariant, Decl(conditionalTypes2.ts, 0, 0))
->B : Symbol(B, Decl(conditionalTypes2.ts, 12, 14))
+>B : Symbol(B, Decl(conditionalTypes2.ts, 14, 14))
 
-    a = b;
->a : Symbol(a, Decl(conditionalTypes2.ts, 12, 28))
->b : Symbol(b, Decl(conditionalTypes2.ts, 12, 44))
+    a = b;  // Error
+>a : Symbol(a, Decl(conditionalTypes2.ts, 14, 28))
+>b : Symbol(b, Decl(conditionalTypes2.ts, 14, 44))
 
     b = a;  // Error
->b : Symbol(b, Decl(conditionalTypes2.ts, 12, 44))
->a : Symbol(a, Decl(conditionalTypes2.ts, 12, 28))
+>b : Symbol(b, Decl(conditionalTypes2.ts, 14, 44))
+>a : Symbol(a, Decl(conditionalTypes2.ts, 14, 28))
 }
 
 function f2<A, B extends A>(a: Contravariant<A>, b: Contravariant<B>) {
->f2 : Symbol(f2, Decl(conditionalTypes2.ts, 15, 1))
->A : Symbol(A, Decl(conditionalTypes2.ts, 17, 12))
->B : Symbol(B, Decl(conditionalTypes2.ts, 17, 14))
->A : Symbol(A, Decl(conditionalTypes2.ts, 17, 12))
->a : Symbol(a, Decl(conditionalTypes2.ts, 17, 28))
->Contravariant : Symbol(Contravariant, Decl(conditionalTypes2.ts, 2, 1))
->A : Symbol(A, Decl(conditionalTypes2.ts, 17, 12))
->b : Symbol(b, Decl(conditionalTypes2.ts, 17, 48))
->Contravariant : Symbol(Contravariant, Decl(conditionalTypes2.ts, 2, 1))
->B : Symbol(B, Decl(conditionalTypes2.ts, 17, 14))
+>f2 : Symbol(f2, Decl(conditionalTypes2.ts, 17, 1))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 19, 12))
+>B : Symbol(B, Decl(conditionalTypes2.ts, 19, 14))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 19, 12))
+>a : Symbol(a, Decl(conditionalTypes2.ts, 19, 28))
+>Contravariant : Symbol(Contravariant, Decl(conditionalTypes2.ts, 4, 1))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 19, 12))
+>b : Symbol(b, Decl(conditionalTypes2.ts, 19, 48))
+>Contravariant : Symbol(Contravariant, Decl(conditionalTypes2.ts, 4, 1))
+>B : Symbol(B, Decl(conditionalTypes2.ts, 19, 14))
 
     a = b;  // Error
->a : Symbol(a, Decl(conditionalTypes2.ts, 17, 28))
->b : Symbol(b, Decl(conditionalTypes2.ts, 17, 48))
+>a : Symbol(a, Decl(conditionalTypes2.ts, 19, 28))
+>b : Symbol(b, Decl(conditionalTypes2.ts, 19, 48))
 
-    b = a;
->b : Symbol(b, Decl(conditionalTypes2.ts, 17, 48))
->a : Symbol(a, Decl(conditionalTypes2.ts, 17, 28))
+    b = a;  // Error
+>b : Symbol(b, Decl(conditionalTypes2.ts, 19, 48))
+>a : Symbol(a, Decl(conditionalTypes2.ts, 19, 28))
 }
 
 function f3<A, B extends A>(a: Invariant<A>, b: Invariant<B>) {
->f3 : Symbol(f3, Decl(conditionalTypes2.ts, 20, 1))
->A : Symbol(A, Decl(conditionalTypes2.ts, 22, 12))
->B : Symbol(B, Decl(conditionalTypes2.ts, 22, 14))
->A : Symbol(A, Decl(conditionalTypes2.ts, 22, 12))
->a : Symbol(a, Decl(conditionalTypes2.ts, 22, 28))
->Invariant : Symbol(Invariant, Decl(conditionalTypes2.ts, 6, 1))
->A : Symbol(A, Decl(conditionalTypes2.ts, 22, 12))
->b : Symbol(b, Decl(conditionalTypes2.ts, 22, 44))
->Invariant : Symbol(Invariant, Decl(conditionalTypes2.ts, 6, 1))
->B : Symbol(B, Decl(conditionalTypes2.ts, 22, 14))
+>f3 : Symbol(f3, Decl(conditionalTypes2.ts, 22, 1))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 24, 12))
+>B : Symbol(B, Decl(conditionalTypes2.ts, 24, 14))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 24, 12))
+>a : Symbol(a, Decl(conditionalTypes2.ts, 24, 28))
+>Invariant : Symbol(Invariant, Decl(conditionalTypes2.ts, 8, 1))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 24, 12))
+>b : Symbol(b, Decl(conditionalTypes2.ts, 24, 44))
+>Invariant : Symbol(Invariant, Decl(conditionalTypes2.ts, 8, 1))
+>B : Symbol(B, Decl(conditionalTypes2.ts, 24, 14))
 
     a = b;  // Error
->a : Symbol(a, Decl(conditionalTypes2.ts, 22, 28))
->b : Symbol(b, Decl(conditionalTypes2.ts, 22, 44))
+>a : Symbol(a, Decl(conditionalTypes2.ts, 24, 28))
+>b : Symbol(b, Decl(conditionalTypes2.ts, 24, 44))
 
     b = a;  // Error
->b : Symbol(b, Decl(conditionalTypes2.ts, 22, 44))
->a : Symbol(a, Decl(conditionalTypes2.ts, 22, 28))
+>b : Symbol(b, Decl(conditionalTypes2.ts, 24, 44))
+>a : Symbol(a, Decl(conditionalTypes2.ts, 24, 28))
 }
 
 // Extract<T, Function> is a T that is known to be a Function
 function isFunction<T>(value: T): value is Extract<T, Function> {
->isFunction : Symbol(isFunction, Decl(conditionalTypes2.ts, 25, 1))
->T : Symbol(T, Decl(conditionalTypes2.ts, 28, 20))
->value : Symbol(value, Decl(conditionalTypes2.ts, 28, 23))
->T : Symbol(T, Decl(conditionalTypes2.ts, 28, 20))
->value : Symbol(value, Decl(conditionalTypes2.ts, 28, 23))
+>isFunction : Symbol(isFunction, Decl(conditionalTypes2.ts, 27, 1))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 30, 20))
+>value : Symbol(value, Decl(conditionalTypes2.ts, 30, 23))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 30, 20))
+>value : Symbol(value, Decl(conditionalTypes2.ts, 30, 23))
 >Extract : Symbol(Extract, Decl(lib.es5.d.ts, --, --))
->T : Symbol(T, Decl(conditionalTypes2.ts, 28, 20))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 30, 20))
 >Function : Symbol(Function, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
 
     return typeof value === "function";
->value : Symbol(value, Decl(conditionalTypes2.ts, 28, 23))
+>value : Symbol(value, Decl(conditionalTypes2.ts, 30, 23))
 }
 
 function getFunction<T>(item: T) {
->getFunction : Symbol(getFunction, Decl(conditionalTypes2.ts, 30, 1))
->T : Symbol(T, Decl(conditionalTypes2.ts, 32, 21))
->item : Symbol(item, Decl(conditionalTypes2.ts, 32, 24))
->T : Symbol(T, Decl(conditionalTypes2.ts, 32, 21))
+>getFunction : Symbol(getFunction, Decl(conditionalTypes2.ts, 32, 1))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 34, 21))
+>item : Symbol(item, Decl(conditionalTypes2.ts, 34, 24))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 34, 21))
 
     if (isFunction(item)) {
->isFunction : Symbol(isFunction, Decl(conditionalTypes2.ts, 25, 1))
->item : Symbol(item, Decl(conditionalTypes2.ts, 32, 24))
+>isFunction : Symbol(isFunction, Decl(conditionalTypes2.ts, 27, 1))
+>item : Symbol(item, Decl(conditionalTypes2.ts, 34, 24))
 
         return item;
->item : Symbol(item, Decl(conditionalTypes2.ts, 32, 24))
+>item : Symbol(item, Decl(conditionalTypes2.ts, 34, 24))
     }
     throw new Error();
 >Error : Symbol(Error, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
 }
 
 function f10<T>(x: T) {
->f10 : Symbol(f10, Decl(conditionalTypes2.ts, 37, 1))
->T : Symbol(T, Decl(conditionalTypes2.ts, 39, 13))
->x : Symbol(x, Decl(conditionalTypes2.ts, 39, 16))
->T : Symbol(T, Decl(conditionalTypes2.ts, 39, 13))
+>f10 : Symbol(f10, Decl(conditionalTypes2.ts, 39, 1))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 41, 13))
+>x : Symbol(x, Decl(conditionalTypes2.ts, 41, 16))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 41, 13))
 
     if (isFunction(x)) {
->isFunction : Symbol(isFunction, Decl(conditionalTypes2.ts, 25, 1))
->x : Symbol(x, Decl(conditionalTypes2.ts, 39, 16))
+>isFunction : Symbol(isFunction, Decl(conditionalTypes2.ts, 27, 1))
+>x : Symbol(x, Decl(conditionalTypes2.ts, 41, 16))
 
         const f: Function = x;
->f : Symbol(f, Decl(conditionalTypes2.ts, 41, 13))
+>f : Symbol(f, Decl(conditionalTypes2.ts, 43, 13))
 >Function : Symbol(Function, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
->x : Symbol(x, Decl(conditionalTypes2.ts, 39, 16))
+>x : Symbol(x, Decl(conditionalTypes2.ts, 41, 16))
 
         const t: T = x;
->t : Symbol(t, Decl(conditionalTypes2.ts, 42, 13))
->T : Symbol(T, Decl(conditionalTypes2.ts, 39, 13))
->x : Symbol(x, Decl(conditionalTypes2.ts, 39, 16))
+>t : Symbol(t, Decl(conditionalTypes2.ts, 44, 13))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 41, 13))
+>x : Symbol(x, Decl(conditionalTypes2.ts, 41, 16))
     }
 }
 
 function f11(x: string | (() => string) | undefined) {
->f11 : Symbol(f11, Decl(conditionalTypes2.ts, 44, 1))
->x : Symbol(x, Decl(conditionalTypes2.ts, 46, 13))
+>f11 : Symbol(f11, Decl(conditionalTypes2.ts, 46, 1))
+>x : Symbol(x, Decl(conditionalTypes2.ts, 48, 13))
 
     if (isFunction(x)) {
->isFunction : Symbol(isFunction, Decl(conditionalTypes2.ts, 25, 1))
->x : Symbol(x, Decl(conditionalTypes2.ts, 46, 13))
+>isFunction : Symbol(isFunction, Decl(conditionalTypes2.ts, 27, 1))
+>x : Symbol(x, Decl(conditionalTypes2.ts, 48, 13))
 
         x();
->x : Symbol(x, Decl(conditionalTypes2.ts, 46, 13))
+>x : Symbol(x, Decl(conditionalTypes2.ts, 48, 13))
     }
 }
 
 function f12(x: string | (() => string) | undefined) {
->f12 : Symbol(f12, Decl(conditionalTypes2.ts, 50, 1))
->x : Symbol(x, Decl(conditionalTypes2.ts, 52, 13))
+>f12 : Symbol(f12, Decl(conditionalTypes2.ts, 52, 1))
+>x : Symbol(x, Decl(conditionalTypes2.ts, 54, 13))
 
     const f = getFunction(x);  // () => string
->f : Symbol(f, Decl(conditionalTypes2.ts, 53, 9))
->getFunction : Symbol(getFunction, Decl(conditionalTypes2.ts, 30, 1))
->x : Symbol(x, Decl(conditionalTypes2.ts, 52, 13))
+>f : Symbol(f, Decl(conditionalTypes2.ts, 55, 9))
+>getFunction : Symbol(getFunction, Decl(conditionalTypes2.ts, 32, 1))
+>x : Symbol(x, Decl(conditionalTypes2.ts, 54, 13))
 
     f();
->f : Symbol(f, Decl(conditionalTypes2.ts, 53, 9))
+>f : Symbol(f, Decl(conditionalTypes2.ts, 55, 9))
 }
 
 type Foo = { foo: string };
->Foo : Symbol(Foo, Decl(conditionalTypes2.ts, 55, 1))
->foo : Symbol(foo, Decl(conditionalTypes2.ts, 57, 12))
+>Foo : Symbol(Foo, Decl(conditionalTypes2.ts, 57, 1))
+>foo : Symbol(foo, Decl(conditionalTypes2.ts, 59, 12))
 
 type Bar = { bar: string };
->Bar : Symbol(Bar, Decl(conditionalTypes2.ts, 57, 27))
->bar : Symbol(bar, Decl(conditionalTypes2.ts, 58, 12))
+>Bar : Symbol(Bar, Decl(conditionalTypes2.ts, 59, 27))
+>bar : Symbol(bar, Decl(conditionalTypes2.ts, 60, 12))
 
 declare function fooBar(x: { foo: string, bar: string }): void;
->fooBar : Symbol(fooBar, Decl(conditionalTypes2.ts, 58, 27))
->x : Symbol(x, Decl(conditionalTypes2.ts, 60, 24))
->foo : Symbol(foo, Decl(conditionalTypes2.ts, 60, 28))
->bar : Symbol(bar, Decl(conditionalTypes2.ts, 60, 41))
+>fooBar : Symbol(fooBar, Decl(conditionalTypes2.ts, 60, 27))
+>x : Symbol(x, Decl(conditionalTypes2.ts, 62, 24))
+>foo : Symbol(foo, Decl(conditionalTypes2.ts, 62, 28))
+>bar : Symbol(bar, Decl(conditionalTypes2.ts, 62, 41))
 
 declare function fooBat(x: { foo: string, bat: string }): void;
->fooBat : Symbol(fooBat, Decl(conditionalTypes2.ts, 60, 63))
->x : Symbol(x, Decl(conditionalTypes2.ts, 61, 24))
->foo : Symbol(foo, Decl(conditionalTypes2.ts, 61, 28))
->bat : Symbol(bat, Decl(conditionalTypes2.ts, 61, 41))
+>fooBat : Symbol(fooBat, Decl(conditionalTypes2.ts, 62, 63))
+>x : Symbol(x, Decl(conditionalTypes2.ts, 63, 24))
+>foo : Symbol(foo, Decl(conditionalTypes2.ts, 63, 28))
+>bat : Symbol(bat, Decl(conditionalTypes2.ts, 63, 41))
 
 type Extract2<T, U, V> = T extends U ? T extends V ? T : never : never;
->Extract2 : Symbol(Extract2, Decl(conditionalTypes2.ts, 61, 63))
->T : Symbol(T, Decl(conditionalTypes2.ts, 63, 14))
->U : Symbol(U, Decl(conditionalTypes2.ts, 63, 16))
->V : Symbol(V, Decl(conditionalTypes2.ts, 63, 19))
->T : Symbol(T, Decl(conditionalTypes2.ts, 63, 14))
->U : Symbol(U, Decl(conditionalTypes2.ts, 63, 16))
->T : Symbol(T, Decl(conditionalTypes2.ts, 63, 14))
->V : Symbol(V, Decl(conditionalTypes2.ts, 63, 19))
->T : Symbol(T, Decl(conditionalTypes2.ts, 63, 14))
+>Extract2 : Symbol(Extract2, Decl(conditionalTypes2.ts, 63, 63))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 65, 14))
+>U : Symbol(U, Decl(conditionalTypes2.ts, 65, 16))
+>V : Symbol(V, Decl(conditionalTypes2.ts, 65, 19))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 65, 14))
+>U : Symbol(U, Decl(conditionalTypes2.ts, 65, 16))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 65, 14))
+>V : Symbol(V, Decl(conditionalTypes2.ts, 65, 19))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 65, 14))
 
 function f20<T>(x: Extract<Extract<T, Foo>, Bar>, y: Extract<T, Foo & Bar>, z: Extract2<T, Foo, Bar>) {
->f20 : Symbol(f20, Decl(conditionalTypes2.ts, 63, 71))
->T : Symbol(T, Decl(conditionalTypes2.ts, 65, 13))
->x : Symbol(x, Decl(conditionalTypes2.ts, 65, 16))
+>f20 : Symbol(f20, Decl(conditionalTypes2.ts, 65, 71))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 67, 13))
+>x : Symbol(x, Decl(conditionalTypes2.ts, 67, 16))
 >Extract : Symbol(Extract, Decl(lib.es5.d.ts, --, --))
 >Extract : Symbol(Extract, Decl(lib.es5.d.ts, --, --))
->T : Symbol(T, Decl(conditionalTypes2.ts, 65, 13))
->Foo : Symbol(Foo, Decl(conditionalTypes2.ts, 55, 1))
->Bar : Symbol(Bar, Decl(conditionalTypes2.ts, 57, 27))
->y : Symbol(y, Decl(conditionalTypes2.ts, 65, 49))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 67, 13))
+>Foo : Symbol(Foo, Decl(conditionalTypes2.ts, 57, 1))
+>Bar : Symbol(Bar, Decl(conditionalTypes2.ts, 59, 27))
+>y : Symbol(y, Decl(conditionalTypes2.ts, 67, 49))
 >Extract : Symbol(Extract, Decl(lib.es5.d.ts, --, --))
->T : Symbol(T, Decl(conditionalTypes2.ts, 65, 13))
->Foo : Symbol(Foo, Decl(conditionalTypes2.ts, 55, 1))
->Bar : Symbol(Bar, Decl(conditionalTypes2.ts, 57, 27))
->z : Symbol(z, Decl(conditionalTypes2.ts, 65, 75))
->Extract2 : Symbol(Extract2, Decl(conditionalTypes2.ts, 61, 63))
->T : Symbol(T, Decl(conditionalTypes2.ts, 65, 13))
->Foo : Symbol(Foo, Decl(conditionalTypes2.ts, 55, 1))
->Bar : Symbol(Bar, Decl(conditionalTypes2.ts, 57, 27))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 67, 13))
+>Foo : Symbol(Foo, Decl(conditionalTypes2.ts, 57, 1))
+>Bar : Symbol(Bar, Decl(conditionalTypes2.ts, 59, 27))
+>z : Symbol(z, Decl(conditionalTypes2.ts, 67, 75))
+>Extract2 : Symbol(Extract2, Decl(conditionalTypes2.ts, 63, 63))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 67, 13))
+>Foo : Symbol(Foo, Decl(conditionalTypes2.ts, 57, 1))
+>Bar : Symbol(Bar, Decl(conditionalTypes2.ts, 59, 27))
 
     fooBar(x);
->fooBar : Symbol(fooBar, Decl(conditionalTypes2.ts, 58, 27))
->x : Symbol(x, Decl(conditionalTypes2.ts, 65, 16))
+>fooBar : Symbol(fooBar, Decl(conditionalTypes2.ts, 60, 27))
+>x : Symbol(x, Decl(conditionalTypes2.ts, 67, 16))
 
     fooBar(y);
->fooBar : Symbol(fooBar, Decl(conditionalTypes2.ts, 58, 27))
->y : Symbol(y, Decl(conditionalTypes2.ts, 65, 49))
+>fooBar : Symbol(fooBar, Decl(conditionalTypes2.ts, 60, 27))
+>y : Symbol(y, Decl(conditionalTypes2.ts, 67, 49))
 
     fooBar(z);
->fooBar : Symbol(fooBar, Decl(conditionalTypes2.ts, 58, 27))
->z : Symbol(z, Decl(conditionalTypes2.ts, 65, 75))
+>fooBar : Symbol(fooBar, Decl(conditionalTypes2.ts, 60, 27))
+>z : Symbol(z, Decl(conditionalTypes2.ts, 67, 75))
 }
 
 function f21<T>(x: Extract<Extract<T, Foo>, Bar>, y: Extract<T, Foo & Bar>, z: Extract2<T, Foo, Bar>) {
->f21 : Symbol(f21, Decl(conditionalTypes2.ts, 69, 1))
->T : Symbol(T, Decl(conditionalTypes2.ts, 71, 13))
->x : Symbol(x, Decl(conditionalTypes2.ts, 71, 16))
+>f21 : Symbol(f21, Decl(conditionalTypes2.ts, 71, 1))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 73, 13))
+>x : Symbol(x, Decl(conditionalTypes2.ts, 73, 16))
 >Extract : Symbol(Extract, Decl(lib.es5.d.ts, --, --))
 >Extract : Symbol(Extract, Decl(lib.es5.d.ts, --, --))
->T : Symbol(T, Decl(conditionalTypes2.ts, 71, 13))
->Foo : Symbol(Foo, Decl(conditionalTypes2.ts, 55, 1))
->Bar : Symbol(Bar, Decl(conditionalTypes2.ts, 57, 27))
->y : Symbol(y, Decl(conditionalTypes2.ts, 71, 49))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 73, 13))
+>Foo : Symbol(Foo, Decl(conditionalTypes2.ts, 57, 1))
+>Bar : Symbol(Bar, Decl(conditionalTypes2.ts, 59, 27))
+>y : Symbol(y, Decl(conditionalTypes2.ts, 73, 49))
 >Extract : Symbol(Extract, Decl(lib.es5.d.ts, --, --))
->T : Symbol(T, Decl(conditionalTypes2.ts, 71, 13))
->Foo : Symbol(Foo, Decl(conditionalTypes2.ts, 55, 1))
->Bar : Symbol(Bar, Decl(conditionalTypes2.ts, 57, 27))
->z : Symbol(z, Decl(conditionalTypes2.ts, 71, 75))
->Extract2 : Symbol(Extract2, Decl(conditionalTypes2.ts, 61, 63))
->T : Symbol(T, Decl(conditionalTypes2.ts, 71, 13))
->Foo : Symbol(Foo, Decl(conditionalTypes2.ts, 55, 1))
->Bar : Symbol(Bar, Decl(conditionalTypes2.ts, 57, 27))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 73, 13))
+>Foo : Symbol(Foo, Decl(conditionalTypes2.ts, 57, 1))
+>Bar : Symbol(Bar, Decl(conditionalTypes2.ts, 59, 27))
+>z : Symbol(z, Decl(conditionalTypes2.ts, 73, 75))
+>Extract2 : Symbol(Extract2, Decl(conditionalTypes2.ts, 63, 63))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 73, 13))
+>Foo : Symbol(Foo, Decl(conditionalTypes2.ts, 57, 1))
+>Bar : Symbol(Bar, Decl(conditionalTypes2.ts, 59, 27))
 
     fooBat(x);  // Error
->fooBat : Symbol(fooBat, Decl(conditionalTypes2.ts, 60, 63))
->x : Symbol(x, Decl(conditionalTypes2.ts, 71, 16))
+>fooBat : Symbol(fooBat, Decl(conditionalTypes2.ts, 62, 63))
+>x : Symbol(x, Decl(conditionalTypes2.ts, 73, 16))
 
     fooBat(y);  // Error
->fooBat : Symbol(fooBat, Decl(conditionalTypes2.ts, 60, 63))
->y : Symbol(y, Decl(conditionalTypes2.ts, 71, 49))
+>fooBat : Symbol(fooBat, Decl(conditionalTypes2.ts, 62, 63))
+>y : Symbol(y, Decl(conditionalTypes2.ts, 73, 49))
 
     fooBat(z);  // Error
->fooBat : Symbol(fooBat, Decl(conditionalTypes2.ts, 60, 63))
->z : Symbol(z, Decl(conditionalTypes2.ts, 71, 75))
-}
-
-// Repros from #22860
-
-class Opt<T> {
->Opt : Symbol(Opt, Decl(conditionalTypes2.ts, 75, 1))
->T : Symbol(T, Decl(conditionalTypes2.ts, 79, 10))
-
-    toVector(): Vector<T> {
->toVector : Symbol(Opt.toVector, Decl(conditionalTypes2.ts, 79, 14))
->Vector : Symbol(Vector, Decl(conditionalTypes2.ts, 87, 1))
->T : Symbol(T, Decl(conditionalTypes2.ts, 79, 10))
-
-        return <any>undefined;
->undefined : Symbol(undefined)
-    }
-}
-
-interface Seq<T> {
->Seq : Symbol(Seq, Decl(conditionalTypes2.ts, 83, 1))
->T : Symbol(T, Decl(conditionalTypes2.ts, 85, 14))
-
-    tail(): Opt<Seq<T>>;
->tail : Symbol(Seq.tail, Decl(conditionalTypes2.ts, 85, 18))
->Opt : Symbol(Opt, Decl(conditionalTypes2.ts, 75, 1))
->Seq : Symbol(Seq, Decl(conditionalTypes2.ts, 83, 1))
->T : Symbol(T, Decl(conditionalTypes2.ts, 85, 14))
-}
-
-class Vector<T> implements Seq<T> {
->Vector : Symbol(Vector, Decl(conditionalTypes2.ts, 87, 1))
->T : Symbol(T, Decl(conditionalTypes2.ts, 89, 13))
->Seq : Symbol(Seq, Decl(conditionalTypes2.ts, 83, 1))
->T : Symbol(T, Decl(conditionalTypes2.ts, 89, 13))
-
-    tail(): Opt<Vector<T>> {
->tail : Symbol(Vector.tail, Decl(conditionalTypes2.ts, 89, 35))
->Opt : Symbol(Opt, Decl(conditionalTypes2.ts, 75, 1))
->Vector : Symbol(Vector, Decl(conditionalTypes2.ts, 87, 1))
->T : Symbol(T, Decl(conditionalTypes2.ts, 89, 13))
-
-        return <any>undefined;
->undefined : Symbol(undefined)
-    }
-    partition2<U extends T>(predicate:(v:T)=>v is U): [Vector<U>,Vector<Exclude<T, U>>];
->partition2 : Symbol(Vector.partition2, Decl(conditionalTypes2.ts, 92, 5), Decl(conditionalTypes2.ts, 93, 88), Decl(conditionalTypes2.ts, 94, 64))
->U : Symbol(U, Decl(conditionalTypes2.ts, 93, 15))
->T : Symbol(T, Decl(conditionalTypes2.ts, 89, 13))
->predicate : Symbol(predicate, Decl(conditionalTypes2.ts, 93, 28))
->v : Symbol(v, Decl(conditionalTypes2.ts, 93, 39))
->T : Symbol(T, Decl(conditionalTypes2.ts, 89, 13))
->v : Symbol(v, Decl(conditionalTypes2.ts, 93, 39))
->U : Symbol(U, Decl(conditionalTypes2.ts, 93, 15))
->Vector : Symbol(Vector, Decl(conditionalTypes2.ts, 87, 1))
->U : Symbol(U, Decl(conditionalTypes2.ts, 93, 15))
->Vector : Symbol(Vector, Decl(conditionalTypes2.ts, 87, 1))
->Exclude : Symbol(Exclude, Decl(lib.es5.d.ts, --, --))
->T : Symbol(T, Decl(conditionalTypes2.ts, 89, 13))
->U : Symbol(U, Decl(conditionalTypes2.ts, 93, 15))
-
-    partition2(predicate:(x:T)=>boolean): [Vector<T>,Vector<T>];
->partition2 : Symbol(Vector.partition2, Decl(conditionalTypes2.ts, 92, 5), Decl(conditionalTypes2.ts, 93, 88), Decl(conditionalTypes2.ts, 94, 64))
->predicate : Symbol(predicate, Decl(conditionalTypes2.ts, 94, 15))
->x : Symbol(x, Decl(conditionalTypes2.ts, 94, 26))
->T : Symbol(T, Decl(conditionalTypes2.ts, 89, 13))
->Vector : Symbol(Vector, Decl(conditionalTypes2.ts, 87, 1))
->T : Symbol(T, Decl(conditionalTypes2.ts, 89, 13))
->Vector : Symbol(Vector, Decl(conditionalTypes2.ts, 87, 1))
->T : Symbol(T, Decl(conditionalTypes2.ts, 89, 13))
-
-    partition2<U extends T>(predicate:(v:T)=>boolean): [Vector<U>,Vector<any>] {
->partition2 : Symbol(Vector.partition2, Decl(conditionalTypes2.ts, 92, 5), Decl(conditionalTypes2.ts, 93, 88), Decl(conditionalTypes2.ts, 94, 64))
->U : Symbol(U, Decl(conditionalTypes2.ts, 95, 15))
->T : Symbol(T, Decl(conditionalTypes2.ts, 89, 13))
->predicate : Symbol(predicate, Decl(conditionalTypes2.ts, 95, 28))
->v : Symbol(v, Decl(conditionalTypes2.ts, 95, 39))
->T : Symbol(T, Decl(conditionalTypes2.ts, 89, 13))
->Vector : Symbol(Vector, Decl(conditionalTypes2.ts, 87, 1))
->U : Symbol(U, Decl(conditionalTypes2.ts, 95, 15))
->Vector : Symbol(Vector, Decl(conditionalTypes2.ts, 87, 1))
-
-        return <any>undefined;
->undefined : Symbol(undefined)
-    }
-}
-
-interface A1<T> {
->A1 : Symbol(A1, Decl(conditionalTypes2.ts, 98, 1))
->T : Symbol(T, Decl(conditionalTypes2.ts, 100, 13))
-
-    bat: B1<A1<T>>;
->bat : Symbol(A1.bat, Decl(conditionalTypes2.ts, 100, 17))
->B1 : Symbol(B1, Decl(conditionalTypes2.ts, 102, 1))
->A1 : Symbol(A1, Decl(conditionalTypes2.ts, 98, 1))
->T : Symbol(T, Decl(conditionalTypes2.ts, 100, 13))
-}
-
-interface B1<T> extends A1<T> {
->B1 : Symbol(B1, Decl(conditionalTypes2.ts, 102, 1))
->T : Symbol(T, Decl(conditionalTypes2.ts, 104, 13))
->A1 : Symbol(A1, Decl(conditionalTypes2.ts, 98, 1))
->T : Symbol(T, Decl(conditionalTypes2.ts, 104, 13))
-
-    bat: B1<B1<T>>;
->bat : Symbol(B1.bat, Decl(conditionalTypes2.ts, 104, 31))
->B1 : Symbol(B1, Decl(conditionalTypes2.ts, 102, 1))
->B1 : Symbol(B1, Decl(conditionalTypes2.ts, 102, 1))
->T : Symbol(T, Decl(conditionalTypes2.ts, 104, 13))
-
-    boom: T extends any ? true : true
->boom : Symbol(B1.boom, Decl(conditionalTypes2.ts, 105, 19))
->T : Symbol(T, Decl(conditionalTypes2.ts, 104, 13))
+>fooBat : Symbol(fooBat, Decl(conditionalTypes2.ts, 62, 63))
+>z : Symbol(z, Decl(conditionalTypes2.ts, 73, 75))
 }
 
 // Repro from #22899
 
 declare function toString1(value: object | Function): string ;
->toString1 : Symbol(toString1, Decl(conditionalTypes2.ts, 107, 1))
->value : Symbol(value, Decl(conditionalTypes2.ts, 111, 27))
+>toString1 : Symbol(toString1, Decl(conditionalTypes2.ts, 77, 1))
+>value : Symbol(value, Decl(conditionalTypes2.ts, 81, 27))
 >Function : Symbol(Function, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
 
 declare function toString2(value: Function): string ;
->toString2 : Symbol(toString2, Decl(conditionalTypes2.ts, 111, 62))
->value : Symbol(value, Decl(conditionalTypes2.ts, 112, 27))
+>toString2 : Symbol(toString2, Decl(conditionalTypes2.ts, 81, 62))
+>value : Symbol(value, Decl(conditionalTypes2.ts, 82, 27))
 >Function : Symbol(Function, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
 
 function foo<T>(value: T) {
->foo : Symbol(foo, Decl(conditionalTypes2.ts, 112, 53))
->T : Symbol(T, Decl(conditionalTypes2.ts, 114, 13))
->value : Symbol(value, Decl(conditionalTypes2.ts, 114, 16))
->T : Symbol(T, Decl(conditionalTypes2.ts, 114, 13))
+>foo : Symbol(foo, Decl(conditionalTypes2.ts, 82, 53))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 84, 13))
+>value : Symbol(value, Decl(conditionalTypes2.ts, 84, 16))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 84, 13))
 
     if (isFunction(value)) {
->isFunction : Symbol(isFunction, Decl(conditionalTypes2.ts, 25, 1))
->value : Symbol(value, Decl(conditionalTypes2.ts, 114, 16))
+>isFunction : Symbol(isFunction, Decl(conditionalTypes2.ts, 27, 1))
+>value : Symbol(value, Decl(conditionalTypes2.ts, 84, 16))
 
         toString1(value);
->toString1 : Symbol(toString1, Decl(conditionalTypes2.ts, 107, 1))
->value : Symbol(value, Decl(conditionalTypes2.ts, 114, 16))
+>toString1 : Symbol(toString1, Decl(conditionalTypes2.ts, 77, 1))
+>value : Symbol(value, Decl(conditionalTypes2.ts, 84, 16))
 
         toString2(value);
->toString2 : Symbol(toString2, Decl(conditionalTypes2.ts, 111, 62))
->value : Symbol(value, Decl(conditionalTypes2.ts, 114, 16))
+>toString2 : Symbol(toString2, Decl(conditionalTypes2.ts, 81, 62))
+>value : Symbol(value, Decl(conditionalTypes2.ts, 84, 16))
     }
 }
 
 // Repro from #23052
 
 type A<T, V, E> =
->A : Symbol(A, Decl(conditionalTypes2.ts, 119, 1))
->T : Symbol(T, Decl(conditionalTypes2.ts, 123, 7))
->V : Symbol(V, Decl(conditionalTypes2.ts, 123, 9))
->E : Symbol(E, Decl(conditionalTypes2.ts, 123, 12))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 89, 1))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 93, 7))
+>V : Symbol(V, Decl(conditionalTypes2.ts, 93, 9))
+>E : Symbol(E, Decl(conditionalTypes2.ts, 93, 12))
 
   T extends object
->T : Symbol(T, Decl(conditionalTypes2.ts, 123, 7))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 93, 7))
 
     ? { [Q in { [P in keyof T]: T[P] extends V ? P : P; }[keyof T]]: A<T[Q], V, E>; }
->Q : Symbol(Q, Decl(conditionalTypes2.ts, 125, 9))
->P : Symbol(P, Decl(conditionalTypes2.ts, 125, 17))
->T : Symbol(T, Decl(conditionalTypes2.ts, 123, 7))
->T : Symbol(T, Decl(conditionalTypes2.ts, 123, 7))
->P : Symbol(P, Decl(conditionalTypes2.ts, 125, 17))
->V : Symbol(V, Decl(conditionalTypes2.ts, 123, 9))
->P : Symbol(P, Decl(conditionalTypes2.ts, 125, 17))
->P : Symbol(P, Decl(conditionalTypes2.ts, 125, 17))
->T : Symbol(T, Decl(conditionalTypes2.ts, 123, 7))
->A : Symbol(A, Decl(conditionalTypes2.ts, 119, 1))
->T : Symbol(T, Decl(conditionalTypes2.ts, 123, 7))
->Q : Symbol(Q, Decl(conditionalTypes2.ts, 125, 9))
->V : Symbol(V, Decl(conditionalTypes2.ts, 123, 9))
->E : Symbol(E, Decl(conditionalTypes2.ts, 123, 12))
+>Q : Symbol(Q, Decl(conditionalTypes2.ts, 95, 9))
+>P : Symbol(P, Decl(conditionalTypes2.ts, 95, 17))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 93, 7))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 93, 7))
+>P : Symbol(P, Decl(conditionalTypes2.ts, 95, 17))
+>V : Symbol(V, Decl(conditionalTypes2.ts, 93, 9))
+>P : Symbol(P, Decl(conditionalTypes2.ts, 95, 17))
+>P : Symbol(P, Decl(conditionalTypes2.ts, 95, 17))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 93, 7))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 89, 1))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 93, 7))
+>Q : Symbol(Q, Decl(conditionalTypes2.ts, 95, 9))
+>V : Symbol(V, Decl(conditionalTypes2.ts, 93, 9))
+>E : Symbol(E, Decl(conditionalTypes2.ts, 93, 12))
 
     : T extends V ? T : never;
->T : Symbol(T, Decl(conditionalTypes2.ts, 123, 7))
->V : Symbol(V, Decl(conditionalTypes2.ts, 123, 9))
->T : Symbol(T, Decl(conditionalTypes2.ts, 123, 7))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 93, 7))
+>V : Symbol(V, Decl(conditionalTypes2.ts, 93, 9))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 93, 7))
 
 type B<T, V> =
->B : Symbol(B, Decl(conditionalTypes2.ts, 126, 30))
->T : Symbol(T, Decl(conditionalTypes2.ts, 128, 7))
->V : Symbol(V, Decl(conditionalTypes2.ts, 128, 9))
+>B : Symbol(B, Decl(conditionalTypes2.ts, 96, 30))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 98, 7))
+>V : Symbol(V, Decl(conditionalTypes2.ts, 98, 9))
 
   T extends object
->T : Symbol(T, Decl(conditionalTypes2.ts, 128, 7))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 98, 7))
 
     ? { [Q in { [P in keyof T]: T[P] extends V ? P : P; }[keyof T]]: B<T[Q], V>; }
->Q : Symbol(Q, Decl(conditionalTypes2.ts, 130, 9))
->P : Symbol(P, Decl(conditionalTypes2.ts, 130, 17))
->T : Symbol(T, Decl(conditionalTypes2.ts, 128, 7))
->T : Symbol(T, Decl(conditionalTypes2.ts, 128, 7))
->P : Symbol(P, Decl(conditionalTypes2.ts, 130, 17))
->V : Symbol(V, Decl(conditionalTypes2.ts, 128, 9))
->P : Symbol(P, Decl(conditionalTypes2.ts, 130, 17))
->P : Symbol(P, Decl(conditionalTypes2.ts, 130, 17))
->T : Symbol(T, Decl(conditionalTypes2.ts, 128, 7))
->B : Symbol(B, Decl(conditionalTypes2.ts, 126, 30))
->T : Symbol(T, Decl(conditionalTypes2.ts, 128, 7))
->Q : Symbol(Q, Decl(conditionalTypes2.ts, 130, 9))
->V : Symbol(V, Decl(conditionalTypes2.ts, 128, 9))
+>Q : Symbol(Q, Decl(conditionalTypes2.ts, 100, 9))
+>P : Symbol(P, Decl(conditionalTypes2.ts, 100, 17))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 98, 7))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 98, 7))
+>P : Symbol(P, Decl(conditionalTypes2.ts, 100, 17))
+>V : Symbol(V, Decl(conditionalTypes2.ts, 98, 9))
+>P : Symbol(P, Decl(conditionalTypes2.ts, 100, 17))
+>P : Symbol(P, Decl(conditionalTypes2.ts, 100, 17))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 98, 7))
+>B : Symbol(B, Decl(conditionalTypes2.ts, 96, 30))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 98, 7))
+>Q : Symbol(Q, Decl(conditionalTypes2.ts, 100, 9))
+>V : Symbol(V, Decl(conditionalTypes2.ts, 98, 9))
 
     : T extends V ? T : never;
->T : Symbol(T, Decl(conditionalTypes2.ts, 128, 7))
->V : Symbol(V, Decl(conditionalTypes2.ts, 128, 9))
->T : Symbol(T, Decl(conditionalTypes2.ts, 128, 7))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 98, 7))
+>V : Symbol(V, Decl(conditionalTypes2.ts, 98, 9))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 98, 7))
 
 type C<T, V, E> =
->C : Symbol(C, Decl(conditionalTypes2.ts, 131, 30))
->T : Symbol(T, Decl(conditionalTypes2.ts, 133, 7))
->V : Symbol(V, Decl(conditionalTypes2.ts, 133, 9))
->E : Symbol(E, Decl(conditionalTypes2.ts, 133, 12))
+>C : Symbol(C, Decl(conditionalTypes2.ts, 101, 30))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 103, 7))
+>V : Symbol(V, Decl(conditionalTypes2.ts, 103, 9))
+>E : Symbol(E, Decl(conditionalTypes2.ts, 103, 12))
 
   { [Q in { [P in keyof T]: T[P] extends V ? P : P; }[keyof T]]: C<T[Q], V, E>; };
->Q : Symbol(Q, Decl(conditionalTypes2.ts, 134, 5))
->P : Symbol(P, Decl(conditionalTypes2.ts, 134, 13))
->T : Symbol(T, Decl(conditionalTypes2.ts, 133, 7))
->T : Symbol(T, Decl(conditionalTypes2.ts, 133, 7))
->P : Symbol(P, Decl(conditionalTypes2.ts, 134, 13))
->V : Symbol(V, Decl(conditionalTypes2.ts, 133, 9))
->P : Symbol(P, Decl(conditionalTypes2.ts, 134, 13))
->P : Symbol(P, Decl(conditionalTypes2.ts, 134, 13))
->T : Symbol(T, Decl(conditionalTypes2.ts, 133, 7))
->C : Symbol(C, Decl(conditionalTypes2.ts, 131, 30))
->T : Symbol(T, Decl(conditionalTypes2.ts, 133, 7))
->Q : Symbol(Q, Decl(conditionalTypes2.ts, 134, 5))
->V : Symbol(V, Decl(conditionalTypes2.ts, 133, 9))
->E : Symbol(E, Decl(conditionalTypes2.ts, 133, 12))
+>Q : Symbol(Q, Decl(conditionalTypes2.ts, 104, 5))
+>P : Symbol(P, Decl(conditionalTypes2.ts, 104, 13))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 103, 7))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 103, 7))
+>P : Symbol(P, Decl(conditionalTypes2.ts, 104, 13))
+>V : Symbol(V, Decl(conditionalTypes2.ts, 103, 9))
+>P : Symbol(P, Decl(conditionalTypes2.ts, 104, 13))
+>P : Symbol(P, Decl(conditionalTypes2.ts, 104, 13))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 103, 7))
+>C : Symbol(C, Decl(conditionalTypes2.ts, 101, 30))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 103, 7))
+>Q : Symbol(Q, Decl(conditionalTypes2.ts, 104, 5))
+>V : Symbol(V, Decl(conditionalTypes2.ts, 103, 9))
+>E : Symbol(E, Decl(conditionalTypes2.ts, 103, 12))
 
 // Repro from #23100
 
 type A2<T, V, E> =
->A2 : Symbol(A2, Decl(conditionalTypes2.ts, 134, 82))
->T : Symbol(T, Decl(conditionalTypes2.ts, 138, 8))
->V : Symbol(V, Decl(conditionalTypes2.ts, 138, 10))
->E : Symbol(E, Decl(conditionalTypes2.ts, 138, 13))
+>A2 : Symbol(A2, Decl(conditionalTypes2.ts, 104, 82))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 108, 8))
+>V : Symbol(V, Decl(conditionalTypes2.ts, 108, 10))
+>E : Symbol(E, Decl(conditionalTypes2.ts, 108, 13))
 
     T extends object ? T extends any[] ? T : { [Q in keyof T]: A2<T[Q], V, E>; } : T;
->T : Symbol(T, Decl(conditionalTypes2.ts, 138, 8))
->T : Symbol(T, Decl(conditionalTypes2.ts, 138, 8))
->T : Symbol(T, Decl(conditionalTypes2.ts, 138, 8))
->Q : Symbol(Q, Decl(conditionalTypes2.ts, 139, 48))
->T : Symbol(T, Decl(conditionalTypes2.ts, 138, 8))
->A2 : Symbol(A2, Decl(conditionalTypes2.ts, 134, 82))
->T : Symbol(T, Decl(conditionalTypes2.ts, 138, 8))
->Q : Symbol(Q, Decl(conditionalTypes2.ts, 139, 48))
->V : Symbol(V, Decl(conditionalTypes2.ts, 138, 10))
->E : Symbol(E, Decl(conditionalTypes2.ts, 138, 13))
->T : Symbol(T, Decl(conditionalTypes2.ts, 138, 8))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 108, 8))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 108, 8))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 108, 8))
+>Q : Symbol(Q, Decl(conditionalTypes2.ts, 109, 48))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 108, 8))
+>A2 : Symbol(A2, Decl(conditionalTypes2.ts, 104, 82))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 108, 8))
+>Q : Symbol(Q, Decl(conditionalTypes2.ts, 109, 48))
+>V : Symbol(V, Decl(conditionalTypes2.ts, 108, 10))
+>E : Symbol(E, Decl(conditionalTypes2.ts, 108, 13))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 108, 8))
 
 type B2<T, V> =
->B2 : Symbol(B2, Decl(conditionalTypes2.ts, 139, 85))
->T : Symbol(T, Decl(conditionalTypes2.ts, 141, 8))
->V : Symbol(V, Decl(conditionalTypes2.ts, 141, 10))
+>B2 : Symbol(B2, Decl(conditionalTypes2.ts, 109, 85))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 111, 8))
+>V : Symbol(V, Decl(conditionalTypes2.ts, 111, 10))
 
     T extends object ? T extends any[] ? T : { [Q in keyof T]: B2<T[Q], V>; } : T;
->T : Symbol(T, Decl(conditionalTypes2.ts, 141, 8))
->T : Symbol(T, Decl(conditionalTypes2.ts, 141, 8))
->T : Symbol(T, Decl(conditionalTypes2.ts, 141, 8))
->Q : Symbol(Q, Decl(conditionalTypes2.ts, 142, 48))
->T : Symbol(T, Decl(conditionalTypes2.ts, 141, 8))
->B2 : Symbol(B2, Decl(conditionalTypes2.ts, 139, 85))
->T : Symbol(T, Decl(conditionalTypes2.ts, 141, 8))
->Q : Symbol(Q, Decl(conditionalTypes2.ts, 142, 48))
->V : Symbol(V, Decl(conditionalTypes2.ts, 141, 10))
->T : Symbol(T, Decl(conditionalTypes2.ts, 141, 8))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 111, 8))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 111, 8))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 111, 8))
+>Q : Symbol(Q, Decl(conditionalTypes2.ts, 112, 48))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 111, 8))
+>B2 : Symbol(B2, Decl(conditionalTypes2.ts, 109, 85))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 111, 8))
+>Q : Symbol(Q, Decl(conditionalTypes2.ts, 112, 48))
+>V : Symbol(V, Decl(conditionalTypes2.ts, 111, 10))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 111, 8))
 
 type C2<T, V, E> =
->C2 : Symbol(C2, Decl(conditionalTypes2.ts, 142, 82))
->T : Symbol(T, Decl(conditionalTypes2.ts, 144, 8))
->V : Symbol(V, Decl(conditionalTypes2.ts, 144, 10))
->E : Symbol(E, Decl(conditionalTypes2.ts, 144, 13))
+>C2 : Symbol(C2, Decl(conditionalTypes2.ts, 112, 82))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 114, 8))
+>V : Symbol(V, Decl(conditionalTypes2.ts, 114, 10))
+>E : Symbol(E, Decl(conditionalTypes2.ts, 114, 13))
 
     T extends object ? { [Q in keyof T]: C2<T[Q], V, E>; } : T;
->T : Symbol(T, Decl(conditionalTypes2.ts, 144, 8))
->Q : Symbol(Q, Decl(conditionalTypes2.ts, 145, 26))
->T : Symbol(T, Decl(conditionalTypes2.ts, 144, 8))
->C2 : Symbol(C2, Decl(conditionalTypes2.ts, 142, 82))
->T : Symbol(T, Decl(conditionalTypes2.ts, 144, 8))
->Q : Symbol(Q, Decl(conditionalTypes2.ts, 145, 26))
->V : Symbol(V, Decl(conditionalTypes2.ts, 144, 10))
->E : Symbol(E, Decl(conditionalTypes2.ts, 144, 13))
->T : Symbol(T, Decl(conditionalTypes2.ts, 144, 8))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 114, 8))
+>Q : Symbol(Q, Decl(conditionalTypes2.ts, 115, 26))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 114, 8))
+>C2 : Symbol(C2, Decl(conditionalTypes2.ts, 112, 82))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 114, 8))
+>Q : Symbol(Q, Decl(conditionalTypes2.ts, 115, 26))
+>V : Symbol(V, Decl(conditionalTypes2.ts, 114, 10))
+>E : Symbol(E, Decl(conditionalTypes2.ts, 114, 13))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 114, 8))
 
 // Repro from #28654
 
 type MaybeTrue<T extends { b: boolean }> = true extends T["b"] ? "yes" : "no";
->MaybeTrue : Symbol(MaybeTrue, Decl(conditionalTypes2.ts, 145, 63))
->T : Symbol(T, Decl(conditionalTypes2.ts, 149, 15))
->b : Symbol(b, Decl(conditionalTypes2.ts, 149, 26))
->T : Symbol(T, Decl(conditionalTypes2.ts, 149, 15))
+>MaybeTrue : Symbol(MaybeTrue, Decl(conditionalTypes2.ts, 115, 63))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 119, 15))
+>b : Symbol(b, Decl(conditionalTypes2.ts, 119, 26))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 119, 15))
 
 type T0 = MaybeTrue<{ b: never }>     // "no"
->T0 : Symbol(T0, Decl(conditionalTypes2.ts, 149, 78))
->MaybeTrue : Symbol(MaybeTrue, Decl(conditionalTypes2.ts, 145, 63))
->b : Symbol(b, Decl(conditionalTypes2.ts, 151, 21))
+>T0 : Symbol(T0, Decl(conditionalTypes2.ts, 119, 78))
+>MaybeTrue : Symbol(MaybeTrue, Decl(conditionalTypes2.ts, 115, 63))
+>b : Symbol(b, Decl(conditionalTypes2.ts, 121, 21))
 
 type T1 = MaybeTrue<{ b: false }>;    // "no"
->T1 : Symbol(T1, Decl(conditionalTypes2.ts, 151, 33))
->MaybeTrue : Symbol(MaybeTrue, Decl(conditionalTypes2.ts, 145, 63))
->b : Symbol(b, Decl(conditionalTypes2.ts, 152, 21))
+>T1 : Symbol(T1, Decl(conditionalTypes2.ts, 121, 33))
+>MaybeTrue : Symbol(MaybeTrue, Decl(conditionalTypes2.ts, 115, 63))
+>b : Symbol(b, Decl(conditionalTypes2.ts, 122, 21))
 
 type T2 = MaybeTrue<{ b: true }>;     // "yes"
->T2 : Symbol(T2, Decl(conditionalTypes2.ts, 152, 34))
->MaybeTrue : Symbol(MaybeTrue, Decl(conditionalTypes2.ts, 145, 63))
->b : Symbol(b, Decl(conditionalTypes2.ts, 153, 21))
+>T2 : Symbol(T2, Decl(conditionalTypes2.ts, 122, 34))
+>MaybeTrue : Symbol(MaybeTrue, Decl(conditionalTypes2.ts, 115, 63))
+>b : Symbol(b, Decl(conditionalTypes2.ts, 123, 21))
 
 type T3 = MaybeTrue<{ b: boolean }>;  // "yes"
->T3 : Symbol(T3, Decl(conditionalTypes2.ts, 153, 33))
->MaybeTrue : Symbol(MaybeTrue, Decl(conditionalTypes2.ts, 145, 63))
->b : Symbol(b, Decl(conditionalTypes2.ts, 154, 21))
+>T3 : Symbol(T3, Decl(conditionalTypes2.ts, 123, 33))
+>MaybeTrue : Symbol(MaybeTrue, Decl(conditionalTypes2.ts, 115, 63))
+>b : Symbol(b, Decl(conditionalTypes2.ts, 124, 21))
 
 // Repro from #28824
 
 type Union = 'a' | 'b';
->Union : Symbol(Union, Decl(conditionalTypes2.ts, 154, 36))
+>Union : Symbol(Union, Decl(conditionalTypes2.ts, 124, 36))
 
 type Product<A extends Union, B> = { f1: A, f2: B};
->Product : Symbol(Product, Decl(conditionalTypes2.ts, 158, 23))
->A : Symbol(A, Decl(conditionalTypes2.ts, 159, 13))
->Union : Symbol(Union, Decl(conditionalTypes2.ts, 154, 36))
->B : Symbol(B, Decl(conditionalTypes2.ts, 159, 29))
->f1 : Symbol(f1, Decl(conditionalTypes2.ts, 159, 36))
->A : Symbol(A, Decl(conditionalTypes2.ts, 159, 13))
->f2 : Symbol(f2, Decl(conditionalTypes2.ts, 159, 43))
->B : Symbol(B, Decl(conditionalTypes2.ts, 159, 29))
+>Product : Symbol(Product, Decl(conditionalTypes2.ts, 128, 23))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 129, 13))
+>Union : Symbol(Union, Decl(conditionalTypes2.ts, 124, 36))
+>B : Symbol(B, Decl(conditionalTypes2.ts, 129, 29))
+>f1 : Symbol(f1, Decl(conditionalTypes2.ts, 129, 36))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 129, 13))
+>f2 : Symbol(f2, Decl(conditionalTypes2.ts, 129, 43))
+>B : Symbol(B, Decl(conditionalTypes2.ts, 129, 29))
 
 type ProductUnion = Product<'a', 0> | Product<'b', 1>;
->ProductUnion : Symbol(ProductUnion, Decl(conditionalTypes2.ts, 159, 51))
->Product : Symbol(Product, Decl(conditionalTypes2.ts, 158, 23))
->Product : Symbol(Product, Decl(conditionalTypes2.ts, 158, 23))
+>ProductUnion : Symbol(ProductUnion, Decl(conditionalTypes2.ts, 129, 51))
+>Product : Symbol(Product, Decl(conditionalTypes2.ts, 128, 23))
+>Product : Symbol(Product, Decl(conditionalTypes2.ts, 128, 23))
 
 // {a: "b"; b: "a"}
 type UnionComplement = {
->UnionComplement : Symbol(UnionComplement, Decl(conditionalTypes2.ts, 160, 54))
+>UnionComplement : Symbol(UnionComplement, Decl(conditionalTypes2.ts, 130, 54))
 
   [K in Union]: Exclude<Union, K>
->K : Symbol(K, Decl(conditionalTypes2.ts, 164, 3))
->Union : Symbol(Union, Decl(conditionalTypes2.ts, 154, 36))
+>K : Symbol(K, Decl(conditionalTypes2.ts, 134, 3))
+>Union : Symbol(Union, Decl(conditionalTypes2.ts, 124, 36))
 >Exclude : Symbol(Exclude, Decl(lib.es5.d.ts, --, --))
->Union : Symbol(Union, Decl(conditionalTypes2.ts, 154, 36))
->K : Symbol(K, Decl(conditionalTypes2.ts, 164, 3))
+>Union : Symbol(Union, Decl(conditionalTypes2.ts, 124, 36))
+>K : Symbol(K, Decl(conditionalTypes2.ts, 134, 3))
 
 };
 type UCA = UnionComplement['a'];
->UCA : Symbol(UCA, Decl(conditionalTypes2.ts, 165, 2))
->UnionComplement : Symbol(UnionComplement, Decl(conditionalTypes2.ts, 160, 54))
+>UCA : Symbol(UCA, Decl(conditionalTypes2.ts, 135, 2))
+>UnionComplement : Symbol(UnionComplement, Decl(conditionalTypes2.ts, 130, 54))
 
 type UCB = UnionComplement['b'];
->UCB : Symbol(UCB, Decl(conditionalTypes2.ts, 166, 32))
->UnionComplement : Symbol(UnionComplement, Decl(conditionalTypes2.ts, 160, 54))
+>UCB : Symbol(UCB, Decl(conditionalTypes2.ts, 136, 32))
+>UnionComplement : Symbol(UnionComplement, Decl(conditionalTypes2.ts, 130, 54))
 
 // {a: "a"; b: "b"}
 type UnionComplementComplement = {
->UnionComplementComplement : Symbol(UnionComplementComplement, Decl(conditionalTypes2.ts, 167, 32))
+>UnionComplementComplement : Symbol(UnionComplementComplement, Decl(conditionalTypes2.ts, 137, 32))
 
   [K in Union]: Exclude<Union, Exclude<Union, K>>
->K : Symbol(K, Decl(conditionalTypes2.ts, 171, 3))
->Union : Symbol(Union, Decl(conditionalTypes2.ts, 154, 36))
+>K : Symbol(K, Decl(conditionalTypes2.ts, 141, 3))
+>Union : Symbol(Union, Decl(conditionalTypes2.ts, 124, 36))
 >Exclude : Symbol(Exclude, Decl(lib.es5.d.ts, --, --))
->Union : Symbol(Union, Decl(conditionalTypes2.ts, 154, 36))
+>Union : Symbol(Union, Decl(conditionalTypes2.ts, 124, 36))
 >Exclude : Symbol(Exclude, Decl(lib.es5.d.ts, --, --))
->Union : Symbol(Union, Decl(conditionalTypes2.ts, 154, 36))
->K : Symbol(K, Decl(conditionalTypes2.ts, 171, 3))
+>Union : Symbol(Union, Decl(conditionalTypes2.ts, 124, 36))
+>K : Symbol(K, Decl(conditionalTypes2.ts, 141, 3))
 
 };
 type UCCA = UnionComplementComplement['a'];
->UCCA : Symbol(UCCA, Decl(conditionalTypes2.ts, 172, 2))
->UnionComplementComplement : Symbol(UnionComplementComplement, Decl(conditionalTypes2.ts, 167, 32))
+>UCCA : Symbol(UCCA, Decl(conditionalTypes2.ts, 142, 2))
+>UnionComplementComplement : Symbol(UnionComplementComplement, Decl(conditionalTypes2.ts, 137, 32))
 
 type UCCB = UnionComplementComplement['b'];
->UCCB : Symbol(UCCB, Decl(conditionalTypes2.ts, 173, 43))
->UnionComplementComplement : Symbol(UnionComplementComplement, Decl(conditionalTypes2.ts, 167, 32))
+>UCCB : Symbol(UCCB, Decl(conditionalTypes2.ts, 143, 43))
+>UnionComplementComplement : Symbol(UnionComplementComplement, Decl(conditionalTypes2.ts, 137, 32))
 
 // {a: Product<'b', 1>; b: Product<'a', 0>}
 type ProductComplement = {
->ProductComplement : Symbol(ProductComplement, Decl(conditionalTypes2.ts, 174, 43))
+>ProductComplement : Symbol(ProductComplement, Decl(conditionalTypes2.ts, 144, 43))
 
   [K in Union]: Exclude<ProductUnion, { f1: K }>
->K : Symbol(K, Decl(conditionalTypes2.ts, 178, 3))
->Union : Symbol(Union, Decl(conditionalTypes2.ts, 154, 36))
+>K : Symbol(K, Decl(conditionalTypes2.ts, 148, 3))
+>Union : Symbol(Union, Decl(conditionalTypes2.ts, 124, 36))
 >Exclude : Symbol(Exclude, Decl(lib.es5.d.ts, --, --))
->ProductUnion : Symbol(ProductUnion, Decl(conditionalTypes2.ts, 159, 51))
->f1 : Symbol(f1, Decl(conditionalTypes2.ts, 178, 39))
->K : Symbol(K, Decl(conditionalTypes2.ts, 178, 3))
+>ProductUnion : Symbol(ProductUnion, Decl(conditionalTypes2.ts, 129, 51))
+>f1 : Symbol(f1, Decl(conditionalTypes2.ts, 148, 39))
+>K : Symbol(K, Decl(conditionalTypes2.ts, 148, 3))
 
 };
 type PCA = ProductComplement['a'];
->PCA : Symbol(PCA, Decl(conditionalTypes2.ts, 179, 2))
->ProductComplement : Symbol(ProductComplement, Decl(conditionalTypes2.ts, 174, 43))
+>PCA : Symbol(PCA, Decl(conditionalTypes2.ts, 149, 2))
+>ProductComplement : Symbol(ProductComplement, Decl(conditionalTypes2.ts, 144, 43))
 
 type PCB = ProductComplement['b'];
->PCB : Symbol(PCB, Decl(conditionalTypes2.ts, 180, 34))
->ProductComplement : Symbol(ProductComplement, Decl(conditionalTypes2.ts, 174, 43))
+>PCB : Symbol(PCB, Decl(conditionalTypes2.ts, 150, 34))
+>ProductComplement : Symbol(ProductComplement, Decl(conditionalTypes2.ts, 144, 43))
 
 // {a: Product<'a', 0>; b: Product<'b', 1>}
 type ProductComplementComplement = {
->ProductComplementComplement : Symbol(ProductComplementComplement, Decl(conditionalTypes2.ts, 181, 34))
+>ProductComplementComplement : Symbol(ProductComplementComplement, Decl(conditionalTypes2.ts, 151, 34))
 
   [K in Union]: Exclude<ProductUnion, Exclude<ProductUnion, { f1: K }>>
->K : Symbol(K, Decl(conditionalTypes2.ts, 185, 3))
->Union : Symbol(Union, Decl(conditionalTypes2.ts, 154, 36))
+>K : Symbol(K, Decl(conditionalTypes2.ts, 155, 3))
+>Union : Symbol(Union, Decl(conditionalTypes2.ts, 124, 36))
 >Exclude : Symbol(Exclude, Decl(lib.es5.d.ts, --, --))
->ProductUnion : Symbol(ProductUnion, Decl(conditionalTypes2.ts, 159, 51))
+>ProductUnion : Symbol(ProductUnion, Decl(conditionalTypes2.ts, 129, 51))
 >Exclude : Symbol(Exclude, Decl(lib.es5.d.ts, --, --))
->ProductUnion : Symbol(ProductUnion, Decl(conditionalTypes2.ts, 159, 51))
->f1 : Symbol(f1, Decl(conditionalTypes2.ts, 185, 61))
->K : Symbol(K, Decl(conditionalTypes2.ts, 185, 3))
+>ProductUnion : Symbol(ProductUnion, Decl(conditionalTypes2.ts, 129, 51))
+>f1 : Symbol(f1, Decl(conditionalTypes2.ts, 155, 61))
+>K : Symbol(K, Decl(conditionalTypes2.ts, 155, 3))
 
 };
 type PCCA = ProductComplementComplement['a'];
->PCCA : Symbol(PCCA, Decl(conditionalTypes2.ts, 186, 2))
->ProductComplementComplement : Symbol(ProductComplementComplement, Decl(conditionalTypes2.ts, 181, 34))
+>PCCA : Symbol(PCCA, Decl(conditionalTypes2.ts, 156, 2))
+>ProductComplementComplement : Symbol(ProductComplementComplement, Decl(conditionalTypes2.ts, 151, 34))
 
 type PCCB = ProductComplementComplement['b'];
->PCCB : Symbol(PCCB, Decl(conditionalTypes2.ts, 187, 45))
->ProductComplementComplement : Symbol(ProductComplementComplement, Decl(conditionalTypes2.ts, 181, 34))
+>PCCB : Symbol(PCCB, Decl(conditionalTypes2.ts, 157, 45))
+>ProductComplementComplement : Symbol(ProductComplementComplement, Decl(conditionalTypes2.ts, 151, 34))
+
+// Repros from #27118
+
+type MyElement<A> = [A] extends [[infer E]] ? E : never;
+>MyElement : Symbol(MyElement, Decl(conditionalTypes2.ts, 158, 45))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 162, 15))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 162, 15))
+>E : Symbol(E, Decl(conditionalTypes2.ts, 162, 39))
+>E : Symbol(E, Decl(conditionalTypes2.ts, 162, 39))
+
+function oops<A, B extends A>(arg: MyElement<A>): MyElement<B> {
+>oops : Symbol(oops, Decl(conditionalTypes2.ts, 162, 56))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 163, 14))
+>B : Symbol(B, Decl(conditionalTypes2.ts, 163, 16))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 163, 14))
+>arg : Symbol(arg, Decl(conditionalTypes2.ts, 163, 30))
+>MyElement : Symbol(MyElement, Decl(conditionalTypes2.ts, 158, 45))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 163, 14))
+>MyElement : Symbol(MyElement, Decl(conditionalTypes2.ts, 158, 45))
+>B : Symbol(B, Decl(conditionalTypes2.ts, 163, 16))
+
+    return arg;  // Unsound, should be error
+>arg : Symbol(arg, Decl(conditionalTypes2.ts, 163, 30))
+}
+
+type MyAcceptor<A> = [A] extends [[infer E]] ? (arg: E) => void : never;
+>MyAcceptor : Symbol(MyAcceptor, Decl(conditionalTypes2.ts, 165, 1))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 167, 16))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 167, 16))
+>E : Symbol(E, Decl(conditionalTypes2.ts, 167, 40))
+>arg : Symbol(arg, Decl(conditionalTypes2.ts, 167, 48))
+>E : Symbol(E, Decl(conditionalTypes2.ts, 167, 40))
+
+function oops2<A, B extends A>(arg: MyAcceptor<B>): MyAcceptor<A> {
+>oops2 : Symbol(oops2, Decl(conditionalTypes2.ts, 167, 72))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 168, 15))
+>B : Symbol(B, Decl(conditionalTypes2.ts, 168, 17))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 168, 15))
+>arg : Symbol(arg, Decl(conditionalTypes2.ts, 168, 31))
+>MyAcceptor : Symbol(MyAcceptor, Decl(conditionalTypes2.ts, 165, 1))
+>B : Symbol(B, Decl(conditionalTypes2.ts, 168, 17))
+>MyAcceptor : Symbol(MyAcceptor, Decl(conditionalTypes2.ts, 165, 1))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 168, 15))
+
+    return arg;  // Unsound, should be error
+>arg : Symbol(arg, Decl(conditionalTypes2.ts, 168, 31))
+}
+
+type Dist<T> = T extends number ? number : string;
+>Dist : Symbol(Dist, Decl(conditionalTypes2.ts, 170, 1))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 172, 10))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 172, 10))
+
+type Aux<A extends { a: unknown }> = A["a"] extends number ? number : string;
+>Aux : Symbol(Aux, Decl(conditionalTypes2.ts, 172, 50))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 173, 9))
+>a : Symbol(a, Decl(conditionalTypes2.ts, 173, 20))
+>A : Symbol(A, Decl(conditionalTypes2.ts, 173, 9))
+
+type Nondist<T> = Aux<{a: T}>;
+>Nondist : Symbol(Nondist, Decl(conditionalTypes2.ts, 173, 77))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 174, 13))
+>Aux : Symbol(Aux, Decl(conditionalTypes2.ts, 172, 50))
+>a : Symbol(a, Decl(conditionalTypes2.ts, 174, 23))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 174, 13))
+
+function oops3<T>(arg: Dist<T>): Nondist<T> {
+>oops3 : Symbol(oops3, Decl(conditionalTypes2.ts, 174, 30))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 175, 15))
+>arg : Symbol(arg, Decl(conditionalTypes2.ts, 175, 18))
+>Dist : Symbol(Dist, Decl(conditionalTypes2.ts, 170, 1))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 175, 15))
+>Nondist : Symbol(Nondist, Decl(conditionalTypes2.ts, 173, 77))
+>T : Symbol(T, Decl(conditionalTypes2.ts, 175, 15))
+
+    return arg;  // Unsound, should be error
+>arg : Symbol(arg, Decl(conditionalTypes2.ts, 175, 18))
+}
 
diff --git a/tests/baselines/reference/conditionalTypes2.types b/tests/baselines/reference/conditionalTypes2.types
index aac6ba47475..3cffe6ab48e 100644
--- a/tests/baselines/reference/conditionalTypes2.types
+++ b/tests/baselines/reference/conditionalTypes2.types
@@ -1,4 +1,6 @@
 === tests/cases/conformance/types/conditional/conditionalTypes2.ts ===
+// #27118: Conditional types are now invariant in the check type.
+
 interface Covariant<T> {
     foo: T extends string ? T : number;
 >foo : T extends string ? T : number
@@ -19,7 +21,7 @@ function f1<A, B extends A>(a: Covariant<A>, b: Covariant<B>) {
 >a : Covariant<A>
 >b : Covariant<B>
 
-    a = b;
+    a = b;  // Error
 >a = b : Covariant<B>
 >a : Covariant<A>
 >b : Covariant<B>
@@ -40,7 +42,7 @@ function f2<A, B extends A>(a: Contravariant<A>, b: Contravariant<B>) {
 >a : Contravariant<A>
 >b : Contravariant<B>
 
-    b = a;
+    b = a;  // Error
 >b = a : Contravariant<A>
 >b : Contravariant<B>
 >a : Contravariant<A>
@@ -207,71 +209,6 @@ function f21<T>(x: Extract<Extract<T, Foo>, Bar>, y: Extract<T, Foo & Bar>, z: E
 >z : Extract2<T, Foo, Bar>
 }
 
-// Repros from #22860
-
-class Opt<T> {
->Opt : Opt<T>
-
-    toVector(): Vector<T> {
->toVector : () => Vector<T>
-
-        return <any>undefined;
-><any>undefined : any
->undefined : undefined
-    }
-}
-
-interface Seq<T> {
-    tail(): Opt<Seq<T>>;
->tail : () => Opt<Seq<T>>
-}
-
-class Vector<T> implements Seq<T> {
->Vector : Vector<T>
-
-    tail(): Opt<Vector<T>> {
->tail : () => Opt<Vector<T>>
-
-        return <any>undefined;
-><any>undefined : any
->undefined : undefined
-    }
-    partition2<U extends T>(predicate:(v:T)=>v is U): [Vector<U>,Vector<Exclude<T, U>>];
->partition2 : { <U extends T>(predicate: (v: T) => v is U): [Vector<U>, Vector<Exclude<T, U>>]; (predicate: (x: T) => boolean): [Vector<T>, Vector<T>]; }
->predicate : (v: T) => v is U
->v : T
-
-    partition2(predicate:(x:T)=>boolean): [Vector<T>,Vector<T>];
->partition2 : { <U extends T>(predicate: (v: T) => v is U): [Vector<U>, Vector<Exclude<T, U>>]; (predicate: (x: T) => boolean): [Vector<T>, Vector<T>]; }
->predicate : (x: T) => boolean
->x : T
-
-    partition2<U extends T>(predicate:(v:T)=>boolean): [Vector<U>,Vector<any>] {
->partition2 : { <U extends T>(predicate: (v: T) => v is U): [Vector<U>, Vector<Exclude<T, U>>]; (predicate: (x: T) => boolean): [Vector<T>, Vector<T>]; }
->predicate : (v: T) => boolean
->v : T
-
-        return <any>undefined;
-><any>undefined : any
->undefined : undefined
-    }
-}
-
-interface A1<T> {
-    bat: B1<A1<T>>;
->bat : B1<A1<T>>
-}
-
-interface B1<T> extends A1<T> {
-    bat: B1<B1<T>>;
->bat : B1<B1<T>>
-
-    boom: T extends any ? true : true
->boom : T extends any ? true : true
->true : true
->true : true
-}
-
 // Repro from #22899
 
 declare function toString1(value: object | Function): string ;
@@ -431,3 +368,47 @@ type PCCA = ProductComplementComplement['a'];
 type PCCB = ProductComplementComplement['b'];
 >PCCB : Product<"b", 1>
 
+// Repros from #27118
+
+type MyElement<A> = [A] extends [[infer E]] ? E : never;
+>MyElement : MyElement<A>
+
+function oops<A, B extends A>(arg: MyElement<A>): MyElement<B> {
+>oops : <A, B extends A>(arg: MyElement<A>) => MyElement<B>
+>arg : MyElement<A>
+
+    return arg;  // Unsound, should be error
+>arg : MyElement<A>
+}
+
+type MyAcceptor<A> = [A] extends [[infer E]] ? (arg: E) => void : never;
+>MyAcceptor : MyAcceptor<A>
+>arg : E
+
+function oops2<A, B extends A>(arg: MyAcceptor<B>): MyAcceptor<A> {
+>oops2 : <A, B extends A>(arg: MyAcceptor<B>) => MyAcceptor<A>
+>arg : MyAcceptor<B>
+
+    return arg;  // Unsound, should be error
+>arg : MyAcceptor<B>
+}
+
+type Dist<T> = T extends number ? number : string;
+>Dist : Dist<T>
+
+type Aux<A extends { a: unknown }> = A["a"] extends number ? number : string;
+>Aux : Aux<A>
+>a : unknown
+
+type Nondist<T> = Aux<{a: T}>;
+>Nondist : Aux<{ a: T; }>
+>a : T
+
+function oops3<T>(arg: Dist<T>): Nondist<T> {
+>oops3 : <T>(arg: Dist<T>) => Aux<{ a: T; }>
+>arg : Dist<T>
+
+    return arg;  // Unsound, should be error
+>arg : Dist<T>
+}
+
diff --git a/tests/baselines/reference/declarationEmitExpandoPropertyPrivateName.errors.txt b/tests/baselines/reference/declarationEmitExpandoPropertyPrivateName.errors.txt
new file mode 100644
index 00000000000..343a3a5351a
--- /dev/null
+++ b/tests/baselines/reference/declarationEmitExpandoPropertyPrivateName.errors.txt
@@ -0,0 +1,14 @@
+tests/cases/compiler/b.ts(4,1): error TS4032: Property 'val' of exported interface has or is using name 'I' from private module '"tests/cases/compiler/a"'.
+
+
+==== tests/cases/compiler/a.ts (0 errors) ====
+    interface I {}
+    export function f(): I { return null as I; }
+==== tests/cases/compiler/b.ts (1 errors) ====
+    import {f} from "./a";
+    
+    export function q() {}
+    q.val = f();
+    ~~~~~
+!!! error TS4032: Property 'val' of exported interface has or is using name 'I' from private module '"tests/cases/compiler/a"'.
+    
\ No newline at end of file
diff --git a/tests/baselines/reference/declarationEmitExpandoPropertyPrivateName.js b/tests/baselines/reference/declarationEmitExpandoPropertyPrivateName.js
new file mode 100644
index 00000000000..a40fb252760
--- /dev/null
+++ b/tests/baselines/reference/declarationEmitExpandoPropertyPrivateName.js
@@ -0,0 +1,31 @@
+//// [tests/cases/compiler/declarationEmitExpandoPropertyPrivateName.ts] ////
+
+//// [a.ts]
+interface I {}
+export function f(): I { return null as I; }
+//// [b.ts]
+import {f} from "./a";
+
+export function q() {}
+q.val = f();
+
+
+//// [a.js]
+"use strict";
+exports.__esModule = true;
+function f() { return null; }
+exports.f = f;
+//// [b.js]
+"use strict";
+exports.__esModule = true;
+var a_1 = require("./a");
+function q() { }
+exports.q = q;
+q.val = a_1.f();
+
+
+//// [a.d.ts]
+interface I {
+}
+export declare function f(): I;
+export {};
diff --git a/tests/baselines/reference/declarationEmitExpandoPropertyPrivateName.symbols b/tests/baselines/reference/declarationEmitExpandoPropertyPrivateName.symbols
new file mode 100644
index 00000000000..841620f0361
--- /dev/null
+++ b/tests/baselines/reference/declarationEmitExpandoPropertyPrivateName.symbols
@@ -0,0 +1,22 @@
+=== tests/cases/compiler/a.ts ===
+interface I {}
+>I : Symbol(I, Decl(a.ts, 0, 0))
+
+export function f(): I { return null as I; }
+>f : Symbol(f, Decl(a.ts, 0, 14))
+>I : Symbol(I, Decl(a.ts, 0, 0))
+>I : Symbol(I, Decl(a.ts, 0, 0))
+
+=== tests/cases/compiler/b.ts ===
+import {f} from "./a";
+>f : Symbol(f, Decl(b.ts, 0, 8))
+
+export function q() {}
+>q : Symbol(q, Decl(b.ts, 0, 22), Decl(b.ts, 2, 22))
+
+q.val = f();
+>q.val : Symbol(q.val, Decl(b.ts, 2, 22))
+>q : Symbol(q, Decl(b.ts, 0, 22), Decl(b.ts, 2, 22))
+>val : Symbol(q.val, Decl(b.ts, 2, 22))
+>f : Symbol(f, Decl(b.ts, 0, 8))
+
diff --git a/tests/baselines/reference/declarationEmitExpandoPropertyPrivateName.types b/tests/baselines/reference/declarationEmitExpandoPropertyPrivateName.types
new file mode 100644
index 00000000000..7418b414029
--- /dev/null
+++ b/tests/baselines/reference/declarationEmitExpandoPropertyPrivateName.types
@@ -0,0 +1,22 @@
+=== tests/cases/compiler/a.ts ===
+interface I {}
+export function f(): I { return null as I; }
+>f : () => I
+>null as I : I
+>null : null
+
+=== tests/cases/compiler/b.ts ===
+import {f} from "./a";
+>f : () => I
+
+export function q() {}
+>q : typeof q
+
+q.val = f();
+>q.val = f() : I
+>q.val : I
+>q : typeof q
+>val : I
+>f() : I
+>f : () => I
+
diff --git a/tests/baselines/reference/dynamicNames.symbols b/tests/baselines/reference/dynamicNames.symbols
index cfed2817d1d..08f7be94fd5 100644
--- a/tests/baselines/reference/dynamicNames.symbols
+++ b/tests/baselines/reference/dynamicNames.symbols
@@ -7,7 +7,7 @@ export const c1 = 1;
 
 export const s0 = Symbol();
 >s0 : Symbol(s0, Decl(module.ts, 2, 12))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 
 export interface T0 {
 >T0 : Symbol(T0, Decl(module.ts, 2, 27))
diff --git a/tests/baselines/reference/dynamicNamesErrors.symbols b/tests/baselines/reference/dynamicNamesErrors.symbols
index de0d98df453..95fa0cd751e 100644
--- a/tests/baselines/reference/dynamicNamesErrors.symbols
+++ b/tests/baselines/reference/dynamicNamesErrors.symbols
@@ -62,19 +62,19 @@ t2 = t1;
 
 const x = Symbol();
 >x : Symbol(x, Decl(dynamicNamesErrors.ts, 26, 5))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 
 const y = Symbol();
 >y : Symbol(y, Decl(dynamicNamesErrors.ts, 27, 5))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 
 const z = Symbol();
 >z : Symbol(z, Decl(dynamicNamesErrors.ts, 28, 5))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 
 const w = Symbol();
 >w : Symbol(w, Decl(dynamicNamesErrors.ts, 29, 5))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 
 export interface InterfaceMemberVisibility {
 >InterfaceMemberVisibility : Symbol(InterfaceMemberVisibility, Decl(dynamicNamesErrors.ts, 29, 19))
diff --git a/tests/baselines/reference/emitter.noCatchBinding.esnext.js b/tests/baselines/reference/emitter.noCatchBinding.es2019.js
similarity index 73%
rename from tests/baselines/reference/emitter.noCatchBinding.esnext.js
rename to tests/baselines/reference/emitter.noCatchBinding.es2019.js
index f47a947ca1a..c33657960de 100644
--- a/tests/baselines/reference/emitter.noCatchBinding.esnext.js
+++ b/tests/baselines/reference/emitter.noCatchBinding.es2019.js
@@ -1,13 +1,14 @@
-//// [emitter.noCatchBinding.esnext.ts]
+//// [emitter.noCatchBinding.es2019.ts]
 function f() {
     try { } catch { }
     try { } catch { 
         try { } catch { }
     }
     try { } catch { } finally { }
-}
+}
 
-//// [emitter.noCatchBinding.esnext.js]
+
+//// [emitter.noCatchBinding.es2019.js]
 function f() {
     try { }
     catch { }
diff --git a/tests/baselines/reference/emitter.noCatchBinding.es2019.symbols b/tests/baselines/reference/emitter.noCatchBinding.es2019.symbols
new file mode 100644
index 00000000000..54dc63597d4
--- /dev/null
+++ b/tests/baselines/reference/emitter.noCatchBinding.es2019.symbols
@@ -0,0 +1,11 @@
+=== tests/cases/conformance/emitter/es2019/noCatchBinding/emitter.noCatchBinding.es2019.ts ===
+function f() {
+>f : Symbol(f, Decl(emitter.noCatchBinding.es2019.ts, 0, 0))
+
+    try { } catch { }
+    try { } catch { 
+        try { } catch { }
+    }
+    try { } catch { } finally { }
+}
+
diff --git a/tests/baselines/reference/emitter.noCatchBinding.esnext.types b/tests/baselines/reference/emitter.noCatchBinding.es2019.types
similarity index 57%
rename from tests/baselines/reference/emitter.noCatchBinding.esnext.types
rename to tests/baselines/reference/emitter.noCatchBinding.es2019.types
index 70c2b728a5d..79647b35dc4 100644
--- a/tests/baselines/reference/emitter.noCatchBinding.esnext.types
+++ b/tests/baselines/reference/emitter.noCatchBinding.es2019.types
@@ -1,4 +1,4 @@
-=== tests/cases/conformance/emitter/esnext/noCatchBinding/emitter.noCatchBinding.esnext.ts ===
+=== tests/cases/conformance/emitter/es2019/noCatchBinding/emitter.noCatchBinding.es2019.ts ===
 function f() {
 >f : () => void
 
@@ -8,3 +8,4 @@ function f() {
     }
     try { } catch { } finally { }
 }
+
diff --git a/tests/baselines/reference/emitter.noCatchBinding.esnext.symbols b/tests/baselines/reference/emitter.noCatchBinding.esnext.symbols
deleted file mode 100644
index 91242f5b01c..00000000000
--- a/tests/baselines/reference/emitter.noCatchBinding.esnext.symbols
+++ /dev/null
@@ -1,10 +0,0 @@
-=== tests/cases/conformance/emitter/esnext/noCatchBinding/emitter.noCatchBinding.esnext.ts ===
-function f() {
->f : Symbol(f, Decl(emitter.noCatchBinding.esnext.ts, 0, 0))
-
-    try { } catch { }
-    try { } catch { 
-        try { } catch { }
-    }
-    try { } catch { } finally { }
-}
diff --git a/tests/baselines/reference/isomorphicMappedTypeInference.js b/tests/baselines/reference/isomorphicMappedTypeInference.js
index 58912244432..aa904e9afa1 100644
--- a/tests/baselines/reference/isomorphicMappedTypeInference.js
+++ b/tests/baselines/reference/isomorphicMappedTypeInference.js
@@ -149,7 +149,35 @@ var g2 = applySpec({ foo: { bar: { baz: (x: any) => true } } });
 const foo = <T>(object: T, partial: Partial<T>) => object;
 let o = {a: 5, b: 7};
 foo(o, {b: 9});
-o = foo(o, {b: 9});
+o = foo(o, {b: 9});
+
+// Inferring to { [P in K]: X }, where K extends keyof T, produces same inferences as
+// inferring to { [P in keyof T]: X }.
+
+declare function f20<T, K extends keyof T>(obj: Pick<T, K>): T;
+declare function f21<T, K extends keyof T>(obj: Pick<T, K>): K;
+declare function f22<T, K extends keyof T>(obj: Boxified<Pick<T, K>>): T;
+declare function f23<T, U extends keyof T, K extends U>(obj: Pick<T, K>): T;
+declare function f24<T, U, K extends keyof T | keyof U>(obj: Pick<T & U, K>): T & U;
+
+let x0 = f20({ foo: 42, bar: "hello" });
+let x1 = f21({ foo: 42, bar: "hello" });
+let x2 = f22({ foo: { value: 42} , bar: { value: "hello" } });
+let x3 = f23({ foo: 42, bar: "hello" });
+let x4 = f24({ foo: 42, bar: "hello" });
+
+// Repro from #29765
+
+function getProps<T, K extends keyof T>(obj: T, list: K[]): Pick<T, K> {
+    return {} as any;
+}
+
+const myAny: any = {};
+
+const o1 = getProps(myAny, ['foo', 'bar']);
+
+const o2: { foo: any; bar: any } = getProps(myAny, ['foo', 'bar']);
+
 
 //// [isomorphicMappedTypeInference.js]
 function box(x) {
@@ -255,6 +283,18 @@ var foo = function (object, partial) { return object; };
 var o = { a: 5, b: 7 };
 foo(o, { b: 9 });
 o = foo(o, { b: 9 });
+var x0 = f20({ foo: 42, bar: "hello" });
+var x1 = f21({ foo: 42, bar: "hello" });
+var x2 = f22({ foo: { value: 42 }, bar: { value: "hello" } });
+var x3 = f23({ foo: 42, bar: "hello" });
+var x4 = f24({ foo: 42, bar: "hello" });
+// Repro from #29765
+function getProps(obj, list) {
+    return {};
+}
+var myAny = {};
+var o1 = getProps(myAny, ['foo', 'bar']);
+var o2 = getProps(myAny, ['foo', 'bar']);
 
 
 //// [isomorphicMappedTypeInference.d.ts]
@@ -323,3 +363,35 @@ declare let o: {
     a: number;
     b: number;
 };
+declare function f20<T, K extends keyof T>(obj: Pick<T, K>): T;
+declare function f21<T, K extends keyof T>(obj: Pick<T, K>): K;
+declare function f22<T, K extends keyof T>(obj: Boxified<Pick<T, K>>): T;
+declare function f23<T, U extends keyof T, K extends U>(obj: Pick<T, K>): T;
+declare function f24<T, U, K extends keyof T | keyof U>(obj: Pick<T & U, K>): T & U;
+declare let x0: {
+    foo: number;
+    bar: string;
+};
+declare let x1: "foo" | "bar";
+declare let x2: {
+    foo: number;
+    bar: string;
+};
+declare let x3: {
+    foo: number;
+    bar: string;
+};
+declare let x4: {
+    foo: number;
+    bar: string;
+} & {
+    foo: number;
+    bar: string;
+};
+declare function getProps<T, K extends keyof T>(obj: T, list: K[]): Pick<T, K>;
+declare const myAny: any;
+declare const o1: Pick<any, "foo" | "bar">;
+declare const o2: {
+    foo: any;
+    bar: any;
+};
diff --git a/tests/baselines/reference/isomorphicMappedTypeInference.symbols b/tests/baselines/reference/isomorphicMappedTypeInference.symbols
index d36ebc7a4a5..3192be13ff6 100644
--- a/tests/baselines/reference/isomorphicMappedTypeInference.symbols
+++ b/tests/baselines/reference/isomorphicMappedTypeInference.symbols
@@ -486,3 +486,133 @@ o = foo(o, {b: 9});
 >o : Symbol(o, Decl(isomorphicMappedTypeInference.ts, 148, 3))
 >b : Symbol(b, Decl(isomorphicMappedTypeInference.ts, 150, 12))
 
+// Inferring to { [P in K]: X }, where K extends keyof T, produces same inferences as
+// inferring to { [P in keyof T]: X }.
+
+declare function f20<T, K extends keyof T>(obj: Pick<T, K>): T;
+>f20 : Symbol(f20, Decl(isomorphicMappedTypeInference.ts, 150, 19))
+>T : Symbol(T, Decl(isomorphicMappedTypeInference.ts, 155, 21))
+>K : Symbol(K, Decl(isomorphicMappedTypeInference.ts, 155, 23))
+>T : Symbol(T, Decl(isomorphicMappedTypeInference.ts, 155, 21))
+>obj : Symbol(obj, Decl(isomorphicMappedTypeInference.ts, 155, 43))
+>Pick : Symbol(Pick, Decl(lib.es5.d.ts, --, --))
+>T : Symbol(T, Decl(isomorphicMappedTypeInference.ts, 155, 21))
+>K : Symbol(K, Decl(isomorphicMappedTypeInference.ts, 155, 23))
+>T : Symbol(T, Decl(isomorphicMappedTypeInference.ts, 155, 21))
+
+declare function f21<T, K extends keyof T>(obj: Pick<T, K>): K;
+>f21 : Symbol(f21, Decl(isomorphicMappedTypeInference.ts, 155, 63))
+>T : Symbol(T, Decl(isomorphicMappedTypeInference.ts, 156, 21))
+>K : Symbol(K, Decl(isomorphicMappedTypeInference.ts, 156, 23))
+>T : Symbol(T, Decl(isomorphicMappedTypeInference.ts, 156, 21))
+>obj : Symbol(obj, Decl(isomorphicMappedTypeInference.ts, 156, 43))
+>Pick : Symbol(Pick, Decl(lib.es5.d.ts, --, --))
+>T : Symbol(T, Decl(isomorphicMappedTypeInference.ts, 156, 21))
+>K : Symbol(K, Decl(isomorphicMappedTypeInference.ts, 156, 23))
+>K : Symbol(K, Decl(isomorphicMappedTypeInference.ts, 156, 23))
+
+declare function f22<T, K extends keyof T>(obj: Boxified<Pick<T, K>>): T;
+>f22 : Symbol(f22, Decl(isomorphicMappedTypeInference.ts, 156, 63))
+>T : Symbol(T, Decl(isomorphicMappedTypeInference.ts, 157, 21))
+>K : Symbol(K, Decl(isomorphicMappedTypeInference.ts, 157, 23))
+>T : Symbol(T, Decl(isomorphicMappedTypeInference.ts, 157, 21))
+>obj : Symbol(obj, Decl(isomorphicMappedTypeInference.ts, 157, 43))
+>Boxified : Symbol(Boxified, Decl(isomorphicMappedTypeInference.ts, 2, 1))
+>Pick : Symbol(Pick, Decl(lib.es5.d.ts, --, --))
+>T : Symbol(T, Decl(isomorphicMappedTypeInference.ts, 157, 21))
+>K : Symbol(K, Decl(isomorphicMappedTypeInference.ts, 157, 23))
+>T : Symbol(T, Decl(isomorphicMappedTypeInference.ts, 157, 21))
+
+declare function f23<T, U extends keyof T, K extends U>(obj: Pick<T, K>): T;
+>f23 : Symbol(f23, Decl(isomorphicMappedTypeInference.ts, 157, 73))
+>T : Symbol(T, Decl(isomorphicMappedTypeInference.ts, 158, 21))
+>U : Symbol(U, Decl(isomorphicMappedTypeInference.ts, 158, 23))
+>T : Symbol(T, Decl(isomorphicMappedTypeInference.ts, 158, 21))
+>K : Symbol(K, Decl(isomorphicMappedTypeInference.ts, 158, 42))
+>U : Symbol(U, Decl(isomorphicMappedTypeInference.ts, 158, 23))
+>obj : Symbol(obj, Decl(isomorphicMappedTypeInference.ts, 158, 56))
+>Pick : Symbol(Pick, Decl(lib.es5.d.ts, --, --))
+>T : Symbol(T, Decl(isomorphicMappedTypeInference.ts, 158, 21))
+>K : Symbol(K, Decl(isomorphicMappedTypeInference.ts, 158, 42))
+>T : Symbol(T, Decl(isomorphicMappedTypeInference.ts, 158, 21))
+
+declare function f24<T, U, K extends keyof T | keyof U>(obj: Pick<T & U, K>): T & U;
+>f24 : Symbol(f24, Decl(isomorphicMappedTypeInference.ts, 158, 76))
+>T : Symbol(T, Decl(isomorphicMappedTypeInference.ts, 159, 21))
+>U : Symbol(U, Decl(isomorphicMappedTypeInference.ts, 159, 23))
+>K : Symbol(K, Decl(isomorphicMappedTypeInference.ts, 159, 26))
+>T : Symbol(T, Decl(isomorphicMappedTypeInference.ts, 159, 21))
+>U : Symbol(U, Decl(isomorphicMappedTypeInference.ts, 159, 23))
+>obj : Symbol(obj, Decl(isomorphicMappedTypeInference.ts, 159, 56))
+>Pick : Symbol(Pick, Decl(lib.es5.d.ts, --, --))
+>T : Symbol(T, Decl(isomorphicMappedTypeInference.ts, 159, 21))
+>U : Symbol(U, Decl(isomorphicMappedTypeInference.ts, 159, 23))
+>K : Symbol(K, Decl(isomorphicMappedTypeInference.ts, 159, 26))
+>T : Symbol(T, Decl(isomorphicMappedTypeInference.ts, 159, 21))
+>U : Symbol(U, Decl(isomorphicMappedTypeInference.ts, 159, 23))
+
+let x0 = f20({ foo: 42, bar: "hello" });
+>x0 : Symbol(x0, Decl(isomorphicMappedTypeInference.ts, 161, 3))
+>f20 : Symbol(f20, Decl(isomorphicMappedTypeInference.ts, 150, 19))
+>foo : Symbol(foo, Decl(isomorphicMappedTypeInference.ts, 161, 14))
+>bar : Symbol(bar, Decl(isomorphicMappedTypeInference.ts, 161, 23))
+
+let x1 = f21({ foo: 42, bar: "hello" });
+>x1 : Symbol(x1, Decl(isomorphicMappedTypeInference.ts, 162, 3))
+>f21 : Symbol(f21, Decl(isomorphicMappedTypeInference.ts, 155, 63))
+>foo : Symbol(foo, Decl(isomorphicMappedTypeInference.ts, 162, 14))
+>bar : Symbol(bar, Decl(isomorphicMappedTypeInference.ts, 162, 23))
+
+let x2 = f22({ foo: { value: 42} , bar: { value: "hello" } });
+>x2 : Symbol(x2, Decl(isomorphicMappedTypeInference.ts, 163, 3))
+>f22 : Symbol(f22, Decl(isomorphicMappedTypeInference.ts, 156, 63))
+>foo : Symbol(foo, Decl(isomorphicMappedTypeInference.ts, 163, 14))
+>value : Symbol(value, Decl(isomorphicMappedTypeInference.ts, 163, 21))
+>bar : Symbol(bar, Decl(isomorphicMappedTypeInference.ts, 163, 34))
+>value : Symbol(value, Decl(isomorphicMappedTypeInference.ts, 163, 41))
+
+let x3 = f23({ foo: 42, bar: "hello" });
+>x3 : Symbol(x3, Decl(isomorphicMappedTypeInference.ts, 164, 3))
+>f23 : Symbol(f23, Decl(isomorphicMappedTypeInference.ts, 157, 73))
+>foo : Symbol(foo, Decl(isomorphicMappedTypeInference.ts, 164, 14))
+>bar : Symbol(bar, Decl(isomorphicMappedTypeInference.ts, 164, 23))
+
+let x4 = f24({ foo: 42, bar: "hello" });
+>x4 : Symbol(x4, Decl(isomorphicMappedTypeInference.ts, 165, 3))
+>f24 : Symbol(f24, Decl(isomorphicMappedTypeInference.ts, 158, 76))
+>foo : Symbol(foo, Decl(isomorphicMappedTypeInference.ts, 165, 14))
+>bar : Symbol(bar, Decl(isomorphicMappedTypeInference.ts, 165, 23))
+
+// Repro from #29765
+
+function getProps<T, K extends keyof T>(obj: T, list: K[]): Pick<T, K> {
+>getProps : Symbol(getProps, Decl(isomorphicMappedTypeInference.ts, 165, 40))
+>T : Symbol(T, Decl(isomorphicMappedTypeInference.ts, 169, 18))
+>K : Symbol(K, Decl(isomorphicMappedTypeInference.ts, 169, 20))
+>T : Symbol(T, Decl(isomorphicMappedTypeInference.ts, 169, 18))
+>obj : Symbol(obj, Decl(isomorphicMappedTypeInference.ts, 169, 40))
+>T : Symbol(T, Decl(isomorphicMappedTypeInference.ts, 169, 18))
+>list : Symbol(list, Decl(isomorphicMappedTypeInference.ts, 169, 47))
+>K : Symbol(K, Decl(isomorphicMappedTypeInference.ts, 169, 20))
+>Pick : Symbol(Pick, Decl(lib.es5.d.ts, --, --))
+>T : Symbol(T, Decl(isomorphicMappedTypeInference.ts, 169, 18))
+>K : Symbol(K, Decl(isomorphicMappedTypeInference.ts, 169, 20))
+
+    return {} as any;
+}
+
+const myAny: any = {};
+>myAny : Symbol(myAny, Decl(isomorphicMappedTypeInference.ts, 173, 5))
+
+const o1 = getProps(myAny, ['foo', 'bar']);
+>o1 : Symbol(o1, Decl(isomorphicMappedTypeInference.ts, 175, 5))
+>getProps : Symbol(getProps, Decl(isomorphicMappedTypeInference.ts, 165, 40))
+>myAny : Symbol(myAny, Decl(isomorphicMappedTypeInference.ts, 173, 5))
+
+const o2: { foo: any; bar: any } = getProps(myAny, ['foo', 'bar']);
+>o2 : Symbol(o2, Decl(isomorphicMappedTypeInference.ts, 177, 5))
+>foo : Symbol(foo, Decl(isomorphicMappedTypeInference.ts, 177, 11))
+>bar : Symbol(bar, Decl(isomorphicMappedTypeInference.ts, 177, 21))
+>getProps : Symbol(getProps, Decl(isomorphicMappedTypeInference.ts, 165, 40))
+>myAny : Symbol(myAny, Decl(isomorphicMappedTypeInference.ts, 173, 5))
+
diff --git a/tests/baselines/reference/isomorphicMappedTypeInference.types b/tests/baselines/reference/isomorphicMappedTypeInference.types
index 4488fa27daf..1f1fa0d200a 100644
--- a/tests/baselines/reference/isomorphicMappedTypeInference.types
+++ b/tests/baselines/reference/isomorphicMappedTypeInference.types
@@ -507,3 +507,116 @@ o = foo(o, {b: 9});
 >b : number
 >9 : 9
 
+// Inferring to { [P in K]: X }, where K extends keyof T, produces same inferences as
+// inferring to { [P in keyof T]: X }.
+
+declare function f20<T, K extends keyof T>(obj: Pick<T, K>): T;
+>f20 : <T, K extends keyof T>(obj: Pick<T, K>) => T
+>obj : Pick<T, K>
+
+declare function f21<T, K extends keyof T>(obj: Pick<T, K>): K;
+>f21 : <T, K extends keyof T>(obj: Pick<T, K>) => K
+>obj : Pick<T, K>
+
+declare function f22<T, K extends keyof T>(obj: Boxified<Pick<T, K>>): T;
+>f22 : <T, K extends keyof T>(obj: Boxified<Pick<T, K>>) => T
+>obj : Boxified<Pick<T, K>>
+
+declare function f23<T, U extends keyof T, K extends U>(obj: Pick<T, K>): T;
+>f23 : <T, U extends keyof T, K extends U>(obj: Pick<T, K>) => T
+>obj : Pick<T, K>
+
+declare function f24<T, U, K extends keyof T | keyof U>(obj: Pick<T & U, K>): T & U;
+>f24 : <T, U, K extends keyof T | keyof U>(obj: Pick<T & U, K>) => T & U
+>obj : Pick<T & U, K>
+
+let x0 = f20({ foo: 42, bar: "hello" });
+>x0 : { foo: number; bar: string; }
+>f20({ foo: 42, bar: "hello" }) : { foo: number; bar: string; }
+>f20 : <T, K extends keyof T>(obj: Pick<T, K>) => T
+>{ foo: 42, bar: "hello" } : { foo: number; bar: string; }
+>foo : number
+>42 : 42
+>bar : string
+>"hello" : "hello"
+
+let x1 = f21({ foo: 42, bar: "hello" });
+>x1 : "foo" | "bar"
+>f21({ foo: 42, bar: "hello" }) : "foo" | "bar"
+>f21 : <T, K extends keyof T>(obj: Pick<T, K>) => K
+>{ foo: 42, bar: "hello" } : { foo: number; bar: string; }
+>foo : number
+>42 : 42
+>bar : string
+>"hello" : "hello"
+
+let x2 = f22({ foo: { value: 42} , bar: { value: "hello" } });
+>x2 : { foo: number; bar: string; }
+>f22({ foo: { value: 42} , bar: { value: "hello" } }) : { foo: number; bar: string; }
+>f22 : <T, K extends keyof T>(obj: Boxified<Pick<T, K>>) => T
+>{ foo: { value: 42} , bar: { value: "hello" } } : { foo: { value: number; }; bar: { value: string; }; }
+>foo : { value: number; }
+>{ value: 42} : { value: number; }
+>value : number
+>42 : 42
+>bar : { value: string; }
+>{ value: "hello" } : { value: string; }
+>value : string
+>"hello" : "hello"
+
+let x3 = f23({ foo: 42, bar: "hello" });
+>x3 : { foo: number; bar: string; }
+>f23({ foo: 42, bar: "hello" }) : { foo: number; bar: string; }
+>f23 : <T, U extends keyof T, K extends U>(obj: Pick<T, K>) => T
+>{ foo: 42, bar: "hello" } : { foo: number; bar: string; }
+>foo : number
+>42 : 42
+>bar : string
+>"hello" : "hello"
+
+let x4 = f24({ foo: 42, bar: "hello" });
+>x4 : { foo: number; bar: string; } & { foo: number; bar: string; }
+>f24({ foo: 42, bar: "hello" }) : { foo: number; bar: string; } & { foo: number; bar: string; }
+>f24 : <T, U, K extends keyof T | keyof U>(obj: Pick<T & U, K>) => T & U
+>{ foo: 42, bar: "hello" } : { foo: number; bar: string; }
+>foo : number
+>42 : 42
+>bar : string
+>"hello" : "hello"
+
+// Repro from #29765
+
+function getProps<T, K extends keyof T>(obj: T, list: K[]): Pick<T, K> {
+>getProps : <T, K extends keyof T>(obj: T, list: K[]) => Pick<T, K>
+>obj : T
+>list : K[]
+
+    return {} as any;
+>{} as any : any
+>{} : {}
+}
+
+const myAny: any = {};
+>myAny : any
+>{} : {}
+
+const o1 = getProps(myAny, ['foo', 'bar']);
+>o1 : Pick<any, "foo" | "bar">
+>getProps(myAny, ['foo', 'bar']) : Pick<any, "foo" | "bar">
+>getProps : <T, K extends keyof T>(obj: T, list: K[]) => Pick<T, K>
+>myAny : any
+>['foo', 'bar'] : ("foo" | "bar")[]
+>'foo' : "foo"
+>'bar' : "bar"
+
+const o2: { foo: any; bar: any } = getProps(myAny, ['foo', 'bar']);
+>o2 : { foo: any; bar: any; }
+>foo : any
+>bar : any
+>getProps(myAny, ['foo', 'bar']) : Pick<any, "foo" | "bar">
+>getProps : <T, K extends keyof T>(obj: T, list: K[]) => Pick<T, K>
+>myAny : any
+>['foo', 'bar'] : ("foo" | "bar")[]
+>'foo' : "foo"
+>'bar' : "bar"
+
diff --git a/tests/baselines/reference/jqueryInference.js b/tests/baselines/reference/jqueryInference.js
index 05664a889de..cea70bc4391 100644
--- a/tests/baselines/reference/jqueryInference.js
+++ b/tests/baselines/reference/jqueryInference.js
@@ -11,7 +11,7 @@ declare function shouldBeIdentity<T, U>(p: DoNothingAlias<T, U>): MyPromise<T, U
 
 declare const p1: MyPromise<boolean, any>;
 var p2 = shouldBeIdentity(p1);
-var p2: MyPromise<boolean, {}>;
+var p2: MyPromise<boolean, any>;
 
 
 //// [jqueryInference.js]
diff --git a/tests/baselines/reference/jqueryInference.symbols b/tests/baselines/reference/jqueryInference.symbols
index ce3836aacd4..3d6c4f2f960 100644
--- a/tests/baselines/reference/jqueryInference.symbols
+++ b/tests/baselines/reference/jqueryInference.symbols
@@ -48,7 +48,7 @@ var p2 = shouldBeIdentity(p1);
 >shouldBeIdentity : Symbol(shouldBeIdentity, Decl(jqueryInference.ts, 6, 58))
 >p1 : Symbol(p1, Decl(jqueryInference.ts, 10, 13))
 
-var p2: MyPromise<boolean, {}>;
+var p2: MyPromise<boolean, any>;
 >p2 : Symbol(p2, Decl(jqueryInference.ts, 11, 3), Decl(jqueryInference.ts, 12, 3))
 >MyPromise : Symbol(MyPromise, Decl(jqueryInference.ts, 0, 0))
 
diff --git a/tests/baselines/reference/jqueryInference.types b/tests/baselines/reference/jqueryInference.types
index 5f055fe16b2..558b0f53df3 100644
--- a/tests/baselines/reference/jqueryInference.types
+++ b/tests/baselines/reference/jqueryInference.types
@@ -22,11 +22,11 @@ declare const p1: MyPromise<boolean, any>;
 >p1 : MyPromise<boolean, any>
 
 var p2 = shouldBeIdentity(p1);
->p2 : MyPromise<boolean, {}>
->shouldBeIdentity(p1) : MyPromise<boolean, {}>
+>p2 : MyPromise<boolean, any>
+>shouldBeIdentity(p1) : MyPromise<boolean, any>
 >shouldBeIdentity : <T, U>(p: DoNothingAlias<T, U>) => MyPromise<T, U>
 >p1 : MyPromise<boolean, any>
 
-var p2: MyPromise<boolean, {}>;
->p2 : MyPromise<boolean, {}>
+var p2: MyPromise<boolean, any>;
+>p2 : MyPromise<boolean, any>
 
diff --git a/tests/baselines/reference/objectLiteralPropertyImplicitlyAny.symbols b/tests/baselines/reference/objectLiteralPropertyImplicitlyAny.symbols
index ae29ff8bb9e..7f61190b91f 100644
--- a/tests/baselines/reference/objectLiteralPropertyImplicitlyAny.symbols
+++ b/tests/baselines/reference/objectLiteralPropertyImplicitlyAny.symbols
@@ -2,7 +2,7 @@
 const foo = Symbol.for("foo");
 >foo : Symbol(foo, Decl(objectLiteralPropertyImplicitlyAny.ts, 0, 5))
 >Symbol.for : Symbol(SymbolConstructor.for, Decl(lib.es2015.symbol.d.ts, --, --))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 >for : Symbol(SymbolConstructor.for, Decl(lib.es2015.symbol.d.ts, --, --))
 
 const o = { [foo]: undefined };
diff --git a/tests/baselines/reference/objectSpread.types b/tests/baselines/reference/objectSpread.types
index 0ffd5dd20b7..e095a4e03bb 100644
--- a/tests/baselines/reference/objectSpread.types
+++ b/tests/baselines/reference/objectSpread.types
@@ -602,7 +602,7 @@ let exclusive: { id: string, a: number, b: string, c: string, d: boolean } =
 >d : boolean
 
     f({ a: 1, b: 'yes' }, { c: 'no', d: false })
->f({ a: 1, b: 'yes' }, { c: 'no', d: false }) : { a: number; b: string; } & { c: string; d: boolean; } & { id: string; }
+>f({ a: 1, b: 'yes' }, { c: 'no', d: false }) : { a: number; b: string; } & { c: string; d: false; } & { id: string; }
 >f : <T, U>(t: T, u: U) => T & U & { id: string; }
 >{ a: 1, b: 'yes' } : { a: number; b: string; }
 >a : number
diff --git a/tests/baselines/reference/restTupleElements1.types b/tests/baselines/reference/restTupleElements1.types
index 9a8b3aaeb7e..ffa20bf503e 100644
--- a/tests/baselines/reference/restTupleElements1.types
+++ b/tests/baselines/reference/restTupleElements1.types
@@ -173,7 +173,7 @@ f0([]);  // Error
 >[] : never[]
 
 f0([1]);
->f0([1]) : [number, {}]
+>f0([1]) : [number, number]
 >f0 : <T, U>(x: [T, ...U[]]) => [T, U]
 >[1] : [number]
 >1 : 1
diff --git a/tests/baselines/reference/restTuplesFromContextualTypes.errors.txt b/tests/baselines/reference/restTuplesFromContextualTypes.errors.txt
index d2246fbfd84..2b94b57f462 100644
--- a/tests/baselines/reference/restTuplesFromContextualTypes.errors.txt
+++ b/tests/baselines/reference/restTuplesFromContextualTypes.errors.txt
@@ -1,7 +1,7 @@
-tests/cases/conformance/types/rest/restTuplesFromContextualTypes.ts(56,7): error TS2345: Argument of type '(a: number, b: any, ...x: any[]) => void' is not assignable to parameter of type '(x: number, ...args: T) => void'.
+tests/cases/conformance/types/rest/restTuplesFromContextualTypes.ts(56,7): error TS2345: Argument of type '(a: number, b: T[0], ...x: T[number][]) => void' is not assignable to parameter of type '(x: number, ...args: T) => void'.
   Types of parameters 'b' and 'args' are incompatible.
-    Type 'T' is not assignable to type '[any, ...any[]]'.
-      Property '0' is missing in type 'any[]' but required in type '[any, ...any[]]'.
+    Type 'T' is not assignable to type '[T[0], ...T[number][]]'.
+      Property '0' is missing in type 'any[]' but required in type '[T[0], ...T[number][]]'.
 
 
 ==== tests/cases/conformance/types/rest/restTuplesFromContextualTypes.ts (1 errors) ====
@@ -62,10 +62,10 @@ tests/cases/conformance/types/rest/restTuplesFromContextualTypes.ts(56,7): error
         f((a, ...x) => {});
         f((a, b, ...x) => {});
           ~~~~~~~~~~~~~~~~~~
-!!! error TS2345: Argument of type '(a: number, b: any, ...x: any[]) => void' is not assignable to parameter of type '(x: number, ...args: T) => void'.
+!!! error TS2345: Argument of type '(a: number, b: T[0], ...x: T[number][]) => void' is not assignable to parameter of type '(x: number, ...args: T) => void'.
 !!! error TS2345:   Types of parameters 'b' and 'args' are incompatible.
-!!! error TS2345:     Type 'T' is not assignable to type '[any, ...any[]]'.
-!!! error TS2345:       Property '0' is missing in type 'any[]' but required in type '[any, ...any[]]'.
+!!! error TS2345:     Type 'T' is not assignable to type '[T[0], ...T[number][]]'.
+!!! error TS2345:       Property '0' is missing in type 'any[]' but required in type '[T[0], ...T[number][]]'.
     }
     
     // Repro from #25288
@@ -79,4 +79,18 @@ tests/cases/conformance/types/rest/restTuplesFromContextualTypes.ts(56,7): error
     
     (function foo(...rest){}(1, ''));
     take(function(...rest){});
+    
+    // Repro from #29833
+    
+    type ArgsUnion = [number, string] | [number, Error];
+    type TupleUnionFunc = (...params: ArgsUnion) => number;
+    
+    const funcUnionTupleNoRest: TupleUnionFunc = (num, strOrErr) => {
+      return num;
+    };
+    
+    const funcUnionTupleRest: TupleUnionFunc = (...params) => {
+      const [num, strOrErr] = params;
+      return num;
+    };
     
\ No newline at end of file
diff --git a/tests/baselines/reference/restTuplesFromContextualTypes.js b/tests/baselines/reference/restTuplesFromContextualTypes.js
index 3db6c53f384..34e75fcea6e 100644
--- a/tests/baselines/reference/restTuplesFromContextualTypes.js
+++ b/tests/baselines/reference/restTuplesFromContextualTypes.js
@@ -68,6 +68,20 @@ declare function take(cb: (a: number, b: string) => void): void;
 
 (function foo(...rest){}(1, ''));
 take(function(...rest){});
+
+// Repro from #29833
+
+type ArgsUnion = [number, string] | [number, Error];
+type TupleUnionFunc = (...params: ArgsUnion) => number;
+
+const funcUnionTupleNoRest: TupleUnionFunc = (num, strOrErr) => {
+  return num;
+};
+
+const funcUnionTupleRest: TupleUnionFunc = (...params) => {
+  const [num, strOrErr] = params;
+  return num;
+};
 
 
 //// [restTuplesFromContextualTypes.js]
@@ -274,6 +288,17 @@ take(function () {
         rest[_i] = arguments[_i];
     }
 });
+var funcUnionTupleNoRest = function (num, strOrErr) {
+    return num;
+};
+var funcUnionTupleRest = function () {
+    var params = [];
+    for (var _i = 0; _i < arguments.length; _i++) {
+        params[_i] = arguments[_i];
+    }
+    var num = params[0], strOrErr = params[1];
+    return num;
+};
 
 
 //// [restTuplesFromContextualTypes.d.ts]
@@ -286,3 +311,7 @@ declare function f3(cb: (x: number, ...args: typeof t3) => void): void;
 declare function f4<T extends any[]>(t: T): void;
 declare var tuple: [number, string];
 declare function take(cb: (a: number, b: string) => void): void;
+declare type ArgsUnion = [number, string] | [number, Error];
+declare type TupleUnionFunc = (...params: ArgsUnion) => number;
+declare const funcUnionTupleNoRest: TupleUnionFunc;
+declare const funcUnionTupleRest: TupleUnionFunc;
diff --git a/tests/baselines/reference/restTuplesFromContextualTypes.symbols b/tests/baselines/reference/restTuplesFromContextualTypes.symbols
index d9b2310b5e2..c58e8cabcae 100644
--- a/tests/baselines/reference/restTuplesFromContextualTypes.symbols
+++ b/tests/baselines/reference/restTuplesFromContextualTypes.symbols
@@ -265,3 +265,40 @@ take(function(...rest){});
 >take : Symbol(take, Decl(restTuplesFromContextualTypes.ts, 61, 33))
 >rest : Symbol(rest, Decl(restTuplesFromContextualTypes.ts, 68, 14))
 
+// Repro from #29833
+
+type ArgsUnion = [number, string] | [number, Error];
+>ArgsUnion : Symbol(ArgsUnion, Decl(restTuplesFromContextualTypes.ts, 68, 26))
+>Error : Symbol(Error, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+
+type TupleUnionFunc = (...params: ArgsUnion) => number;
+>TupleUnionFunc : Symbol(TupleUnionFunc, Decl(restTuplesFromContextualTypes.ts, 72, 52))
+>params : Symbol(params, Decl(restTuplesFromContextualTypes.ts, 73, 23))
+>ArgsUnion : Symbol(ArgsUnion, Decl(restTuplesFromContextualTypes.ts, 68, 26))
+
+const funcUnionTupleNoRest: TupleUnionFunc = (num, strOrErr) => {
+>funcUnionTupleNoRest : Symbol(funcUnionTupleNoRest, Decl(restTuplesFromContextualTypes.ts, 75, 5))
+>TupleUnionFunc : Symbol(TupleUnionFunc, Decl(restTuplesFromContextualTypes.ts, 72, 52))
+>num : Symbol(num, Decl(restTuplesFromContextualTypes.ts, 75, 46))
+>strOrErr : Symbol(strOrErr, Decl(restTuplesFromContextualTypes.ts, 75, 50))
+
+  return num;
+>num : Symbol(num, Decl(restTuplesFromContextualTypes.ts, 75, 46))
+
+};
+
+const funcUnionTupleRest: TupleUnionFunc = (...params) => {
+>funcUnionTupleRest : Symbol(funcUnionTupleRest, Decl(restTuplesFromContextualTypes.ts, 79, 5))
+>TupleUnionFunc : Symbol(TupleUnionFunc, Decl(restTuplesFromContextualTypes.ts, 72, 52))
+>params : Symbol(params, Decl(restTuplesFromContextualTypes.ts, 79, 44))
+
+  const [num, strOrErr] = params;
+>num : Symbol(num, Decl(restTuplesFromContextualTypes.ts, 80, 9))
+>strOrErr : Symbol(strOrErr, Decl(restTuplesFromContextualTypes.ts, 80, 13))
+>params : Symbol(params, Decl(restTuplesFromContextualTypes.ts, 79, 44))
+
+  return num;
+>num : Symbol(num, Decl(restTuplesFromContextualTypes.ts, 80, 9))
+
+};
+
diff --git a/tests/baselines/reference/restTuplesFromContextualTypes.types b/tests/baselines/reference/restTuplesFromContextualTypes.types
index ee63057b9eb..c282dbbae31 100644
--- a/tests/baselines/reference/restTuplesFromContextualTypes.types
+++ b/tests/baselines/reference/restTuplesFromContextualTypes.types
@@ -332,8 +332,8 @@ function f4<T extends any[]>(t: T) {
     f((...x) => {});
 >f((...x) => {}) : void
 >f : (cb: (x: number, ...args: T) => void) => void
->(...x) => {} : (x: number, ...args: any[]) => void
->x : [number, ...any[]]
+>(...x) => {} : (x: number, ...args: T[number][]) => void
+>x : [number, ...T[number][]]
 
     f((a, ...x) => {});
 >f((a, ...x) => {}) : void
@@ -345,10 +345,10 @@ function f4<T extends any[]>(t: T) {
     f((a, b, ...x) => {});
 >f((a, b, ...x) => {}) : void
 >f : (cb: (x: number, ...args: T) => void) => void
->(a, b, ...x) => {} : (a: number, b: any, ...x: any[]) => void
+>(a, b, ...x) => {} : (a: number, b: T[0], ...x: T[number][]) => void
 >a : number
->b : any
->x : any[]
+>b : T[0]
+>x : T[number][]
 }
 
 // Repro from #25288
@@ -389,3 +389,38 @@ take(function(...rest){});
 >function(...rest){} : (a: number, b: string) => void
 >rest : [number, string]
 
+// Repro from #29833
+
+type ArgsUnion = [number, string] | [number, Error];
+>ArgsUnion : ArgsUnion
+
+type TupleUnionFunc = (...params: ArgsUnion) => number;
+>TupleUnionFunc : TupleUnionFunc
+>params : ArgsUnion
+
+const funcUnionTupleNoRest: TupleUnionFunc = (num, strOrErr) => {
+>funcUnionTupleNoRest : TupleUnionFunc
+>(num, strOrErr) => {  return num;} : (num: number, strOrErr: string | Error) => number
+>num : number
+>strOrErr : string | Error
+
+  return num;
+>num : number
+
+};
+
+const funcUnionTupleRest: TupleUnionFunc = (...params) => {
+>funcUnionTupleRest : TupleUnionFunc
+>(...params) => {  const [num, strOrErr] = params;  return num;} : (...params: ArgsUnion) => number
+>params : ArgsUnion
+
+  const [num, strOrErr] = params;
+>num : number
+>strOrErr : string | Error
+>params : ArgsUnion
+
+  return num;
+>num : number
+
+};
+
diff --git a/tests/baselines/reference/stringTrim.js b/tests/baselines/reference/stringTrim.js
new file mode 100644
index 00000000000..973df9c1ebb
--- /dev/null
+++ b/tests/baselines/reference/stringTrim.js
@@ -0,0 +1,14 @@
+//// [stringTrim.ts]
+var trimmed: string;
+trimmed = "abcde".trimEnd();
+trimmed = "abcde".trimStart();
+trimmed = "abcde".trimLeft();
+trimmed = "abcde".trimRight();
+
+
+//// [stringTrim.js]
+var trimmed;
+trimmed = "abcde".trimEnd();
+trimmed = "abcde".trimStart();
+trimmed = "abcde".trimLeft();
+trimmed = "abcde".trimRight();
diff --git a/tests/baselines/reference/stringTrim.symbols b/tests/baselines/reference/stringTrim.symbols
new file mode 100644
index 00000000000..00f7b34d166
--- /dev/null
+++ b/tests/baselines/reference/stringTrim.symbols
@@ -0,0 +1,24 @@
+=== tests/cases/compiler/stringTrim.ts ===
+var trimmed: string;
+>trimmed : Symbol(trimmed, Decl(stringTrim.ts, 0, 3))
+
+trimmed = "abcde".trimEnd();
+>trimmed : Symbol(trimmed, Decl(stringTrim.ts, 0, 3))
+>"abcde".trimEnd : Symbol(String.trimEnd, Decl(lib.es2019.string.d.ts, --, --))
+>trimEnd : Symbol(String.trimEnd, Decl(lib.es2019.string.d.ts, --, --))
+
+trimmed = "abcde".trimStart();
+>trimmed : Symbol(trimmed, Decl(stringTrim.ts, 0, 3))
+>"abcde".trimStart : Symbol(String.trimStart, Decl(lib.es2019.string.d.ts, --, --))
+>trimStart : Symbol(String.trimStart, Decl(lib.es2019.string.d.ts, --, --))
+
+trimmed = "abcde".trimLeft();
+>trimmed : Symbol(trimmed, Decl(stringTrim.ts, 0, 3))
+>"abcde".trimLeft : Symbol(String.trimLeft, Decl(lib.es2019.string.d.ts, --, --))
+>trimLeft : Symbol(String.trimLeft, Decl(lib.es2019.string.d.ts, --, --))
+
+trimmed = "abcde".trimRight();
+>trimmed : Symbol(trimmed, Decl(stringTrim.ts, 0, 3))
+>"abcde".trimRight : Symbol(String.trimRight, Decl(lib.es2019.string.d.ts, --, --))
+>trimRight : Symbol(String.trimRight, Decl(lib.es2019.string.d.ts, --, --))
+
diff --git a/tests/baselines/reference/stringTrim.types b/tests/baselines/reference/stringTrim.types
new file mode 100644
index 00000000000..5da0b98fb1a
--- /dev/null
+++ b/tests/baselines/reference/stringTrim.types
@@ -0,0 +1,36 @@
+=== tests/cases/compiler/stringTrim.ts ===
+var trimmed: string;
+>trimmed : string
+
+trimmed = "abcde".trimEnd();
+>trimmed = "abcde".trimEnd() : string
+>trimmed : string
+>"abcde".trimEnd() : string
+>"abcde".trimEnd : () => string
+>"abcde" : "abcde"
+>trimEnd : () => string
+
+trimmed = "abcde".trimStart();
+>trimmed = "abcde".trimStart() : string
+>trimmed : string
+>"abcde".trimStart() : string
+>"abcde".trimStart : () => string
+>"abcde" : "abcde"
+>trimStart : () => string
+
+trimmed = "abcde".trimLeft();
+>trimmed = "abcde".trimLeft() : string
+>trimmed : string
+>"abcde".trimLeft() : string
+>"abcde".trimLeft : () => string
+>"abcde" : "abcde"
+>trimLeft : () => string
+
+trimmed = "abcde".trimRight();
+>trimmed = "abcde".trimRight() : string
+>trimmed : string
+>"abcde".trimRight() : string
+>"abcde".trimRight : () => string
+>"abcde" : "abcde"
+>trimRight : () => string
+
diff --git a/tests/baselines/reference/tsConfig/Default initialized TSConfig/tsconfig.json b/tests/baselines/reference/tsConfig/Default initialized TSConfig/tsconfig.json
index ac5ebf02160..b7f98718a83 100644
--- a/tests/baselines/reference/tsConfig/Default initialized TSConfig/tsconfig.json	
+++ b/tests/baselines/reference/tsConfig/Default initialized TSConfig/tsconfig.json	
@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     /* Basic Options */
-    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */
+    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
     "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
     // "lib": [],                             /* Specify library files to be included in the compilation. */
     // "allowJs": true,                       /* Allow javascript files to be compiled. */
diff --git a/tests/baselines/reference/tsConfig/Initialized TSConfig with advanced options/tsconfig.json b/tests/baselines/reference/tsConfig/Initialized TSConfig with advanced options/tsconfig.json
index 0e4adce88d2..452ec708540 100644
--- a/tests/baselines/reference/tsConfig/Initialized TSConfig with advanced options/tsconfig.json	
+++ b/tests/baselines/reference/tsConfig/Initialized TSConfig with advanced options/tsconfig.json	
@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     /* Basic Options */
-    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */
+    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
     "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
     // "lib": [],                             /* Specify library files to be included in the compilation. */
     // "allowJs": true,                       /* Allow javascript files to be compiled. */
diff --git a/tests/baselines/reference/tsConfig/Initialized TSConfig with boolean value compiler options/tsconfig.json b/tests/baselines/reference/tsConfig/Initialized TSConfig with boolean value compiler options/tsconfig.json
index 211bcb97d5f..edd4a72bd8a 100644
--- a/tests/baselines/reference/tsConfig/Initialized TSConfig with boolean value compiler options/tsconfig.json	
+++ b/tests/baselines/reference/tsConfig/Initialized TSConfig with boolean value compiler options/tsconfig.json	
@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     /* Basic Options */
-    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */
+    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
     "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
     // "lib": [],                             /* Specify library files to be included in the compilation. */
     // "allowJs": true,                       /* Allow javascript files to be compiled. */
diff --git a/tests/baselines/reference/tsConfig/Initialized TSConfig with enum value compiler options/tsconfig.json b/tests/baselines/reference/tsConfig/Initialized TSConfig with enum value compiler options/tsconfig.json
index 8c3d7be38ec..d6edb9d5c68 100644
--- a/tests/baselines/reference/tsConfig/Initialized TSConfig with enum value compiler options/tsconfig.json	
+++ b/tests/baselines/reference/tsConfig/Initialized TSConfig with enum value compiler options/tsconfig.json	
@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     /* Basic Options */
-    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */
+    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
     "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
     // "lib": [],                             /* Specify library files to be included in the compilation. */
     // "allowJs": true,                       /* Allow javascript files to be compiled. */
diff --git a/tests/baselines/reference/tsConfig/Initialized TSConfig with files options/tsconfig.json b/tests/baselines/reference/tsConfig/Initialized TSConfig with files options/tsconfig.json
index b8dfce1ff43..ad38b2ad884 100644
--- a/tests/baselines/reference/tsConfig/Initialized TSConfig with files options/tsconfig.json	
+++ b/tests/baselines/reference/tsConfig/Initialized TSConfig with files options/tsconfig.json	
@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     /* Basic Options */
-    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */
+    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
     "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
     // "lib": [],                             /* Specify library files to be included in the compilation. */
     // "allowJs": true,                       /* Allow javascript files to be compiled. */
diff --git a/tests/baselines/reference/tsConfig/Initialized TSConfig with incorrect compiler option value/tsconfig.json b/tests/baselines/reference/tsConfig/Initialized TSConfig with incorrect compiler option value/tsconfig.json
index 60cccb8b3b3..b0107d9d742 100644
--- a/tests/baselines/reference/tsConfig/Initialized TSConfig with incorrect compiler option value/tsconfig.json	
+++ b/tests/baselines/reference/tsConfig/Initialized TSConfig with incorrect compiler option value/tsconfig.json	
@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     /* Basic Options */
-    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */
+    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
     "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
     "lib": ["es5","es2015.promise"],          /* Specify library files to be included in the compilation. */
     // "allowJs": true,                       /* Allow javascript files to be compiled. */
diff --git a/tests/baselines/reference/tsConfig/Initialized TSConfig with incorrect compiler option/tsconfig.json b/tests/baselines/reference/tsConfig/Initialized TSConfig with incorrect compiler option/tsconfig.json
index ac5ebf02160..b7f98718a83 100644
--- a/tests/baselines/reference/tsConfig/Initialized TSConfig with incorrect compiler option/tsconfig.json	
+++ b/tests/baselines/reference/tsConfig/Initialized TSConfig with incorrect compiler option/tsconfig.json	
@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     /* Basic Options */
-    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */
+    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
     "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
     // "lib": [],                             /* Specify library files to be included in the compilation. */
     // "allowJs": true,                       /* Allow javascript files to be compiled. */
diff --git a/tests/baselines/reference/tsConfig/Initialized TSConfig with list compiler options with enum value/tsconfig.json b/tests/baselines/reference/tsConfig/Initialized TSConfig with list compiler options with enum value/tsconfig.json
index 81641589d59..8263ed18aae 100644
--- a/tests/baselines/reference/tsConfig/Initialized TSConfig with list compiler options with enum value/tsconfig.json	
+++ b/tests/baselines/reference/tsConfig/Initialized TSConfig with list compiler options with enum value/tsconfig.json	
@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     /* Basic Options */
-    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */
+    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
     "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
     "lib": ["es5","es2015.core"],             /* Specify library files to be included in the compilation. */
     // "allowJs": true,                       /* Allow javascript files to be compiled. */
diff --git a/tests/baselines/reference/tsConfig/Initialized TSConfig with list compiler options/tsconfig.json b/tests/baselines/reference/tsConfig/Initialized TSConfig with list compiler options/tsconfig.json
index 826babfd625..69249714660 100644
--- a/tests/baselines/reference/tsConfig/Initialized TSConfig with list compiler options/tsconfig.json	
+++ b/tests/baselines/reference/tsConfig/Initialized TSConfig with list compiler options/tsconfig.json	
@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     /* Basic Options */
-    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017','ES2018' or 'ESNEXT'. */
+    "target": "es5",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
     "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
     // "lib": [],                             /* Specify library files to be included in the compilation. */
     // "allowJs": true,                       /* Allow javascript files to be compiled. */
diff --git a/tests/baselines/reference/unionAndIntersectionInference1.js b/tests/baselines/reference/unionAndIntersectionInference1.js
index 235eb23ebf8..ca9e527d99e 100644
--- a/tests/baselines/reference/unionAndIntersectionInference1.js
+++ b/tests/baselines/reference/unionAndIntersectionInference1.js
@@ -71,6 +71,24 @@ declare var mbp: Man & Bear;
 
 pigify(mbp).oinks; // OK, mbp is treated as Pig
 pigify(mbp).walks; // Ok, mbp is treated as Man
+
+// Repros from #29815
+
+interface ITest {
+  name: 'test'
+}
+
+const createTestAsync = (): Promise<ITest> => Promise.resolve().then(() => ({ name: 'test' }))
+
+const createTest = (): ITest => {
+  return { name: 'test' }
+}
+
+declare function f1<T, U>(x: T | U): T | U;
+declare function f2<T, U>(x: T & U): T & U;
+
+let x1: string = f1('a');
+let x2: string = f2('a');
 
 
 //// [unionAndIntersectionInference1.js]
@@ -80,7 +98,7 @@ function destructure(something, haveValue, haveY) {
     return something === y ? haveY(y) : haveValue(something);
 }
 var value = Math.random() > 0.5 ? 'hey!' : undefined;
-var result = destructure(value, function (text) { return 'string'; }, function (y) { return 'other one'; }); // text: string, y: Y
+var result = destructure(value, text => 'string', y => 'other one'); // text: string, y: Y
 // Repro from #4212
 function isVoid(value) {
     return undefined;
@@ -107,7 +125,13 @@ function baz1(value) {
 function get(x) {
     return null; // just an example
 }
-var foo;
+let foo;
 get(foo).toUpperCase(); // Ok
 pigify(mbp).oinks; // OK, mbp is treated as Pig
 pigify(mbp).walks; // Ok, mbp is treated as Man
+const createTestAsync = () => Promise.resolve().then(() => ({ name: 'test' }));
+const createTest = () => {
+    return { name: 'test' };
+};
+let x1 = f1('a');
+let x2 = f2('a');
diff --git a/tests/baselines/reference/unionAndIntersectionInference1.symbols b/tests/baselines/reference/unionAndIntersectionInference1.symbols
index 38bcd416dff..e866f19daa4 100644
--- a/tests/baselines/reference/unionAndIntersectionInference1.symbols
+++ b/tests/baselines/reference/unionAndIntersectionInference1.symbols
@@ -50,7 +50,7 @@ function destructure<a, r>(
 var value = Math.random() > 0.5 ? 'hey!' : <Y>undefined;
 >value : Symbol(value, Decl(unionAndIntersectionInference1.ts, 12, 3))
 >Math.random : Symbol(Math.random, Decl(lib.es5.d.ts, --, --))
->Math : Symbol(Math, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>Math : Symbol(Math, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --))
 >random : Symbol(Math.random, Decl(lib.es5.d.ts, --, --))
 >Y : Symbol(Y, Decl(unionAndIntersectionInference1.ts, 0, 0))
 >undefined : Symbol(undefined)
@@ -201,3 +201,59 @@ pigify(mbp).walks; // Ok, mbp is treated as Man
 >mbp : Symbol(mbp, Decl(unionAndIntersectionInference1.ts, 68, 11))
 >walks : Symbol(Man.walks, Decl(unionAndIntersectionInference1.ts, 55, 15))
 
+// Repros from #29815
+
+interface ITest {
+>ITest : Symbol(ITest, Decl(unionAndIntersectionInference1.ts, 71, 18))
+
+  name: 'test'
+>name : Symbol(ITest.name, Decl(unionAndIntersectionInference1.ts, 75, 17))
+}
+
+const createTestAsync = (): Promise<ITest> => Promise.resolve().then(() => ({ name: 'test' }))
+>createTestAsync : Symbol(createTestAsync, Decl(unionAndIntersectionInference1.ts, 79, 5))
+>Promise : Symbol(Promise, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --))
+>ITest : Symbol(ITest, Decl(unionAndIntersectionInference1.ts, 71, 18))
+>Promise.resolve().then : Symbol(Promise.then, Decl(lib.es5.d.ts, --, --))
+>Promise.resolve : Symbol(PromiseConstructor.resolve, Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --))
+>Promise : Symbol(Promise, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --))
+>resolve : Symbol(PromiseConstructor.resolve, Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --))
+>then : Symbol(Promise.then, Decl(lib.es5.d.ts, --, --))
+>name : Symbol(name, Decl(unionAndIntersectionInference1.ts, 79, 77))
+
+const createTest = (): ITest => {
+>createTest : Symbol(createTest, Decl(unionAndIntersectionInference1.ts, 81, 5))
+>ITest : Symbol(ITest, Decl(unionAndIntersectionInference1.ts, 71, 18))
+
+  return { name: 'test' }
+>name : Symbol(name, Decl(unionAndIntersectionInference1.ts, 82, 10))
+}
+
+declare function f1<T, U>(x: T | U): T | U;
+>f1 : Symbol(f1, Decl(unionAndIntersectionInference1.ts, 83, 1))
+>T : Symbol(T, Decl(unionAndIntersectionInference1.ts, 85, 20))
+>U : Symbol(U, Decl(unionAndIntersectionInference1.ts, 85, 22))
+>x : Symbol(x, Decl(unionAndIntersectionInference1.ts, 85, 26))
+>T : Symbol(T, Decl(unionAndIntersectionInference1.ts, 85, 20))
+>U : Symbol(U, Decl(unionAndIntersectionInference1.ts, 85, 22))
+>T : Symbol(T, Decl(unionAndIntersectionInference1.ts, 85, 20))
+>U : Symbol(U, Decl(unionAndIntersectionInference1.ts, 85, 22))
+
+declare function f2<T, U>(x: T & U): T & U;
+>f2 : Symbol(f2, Decl(unionAndIntersectionInference1.ts, 85, 43))
+>T : Symbol(T, Decl(unionAndIntersectionInference1.ts, 86, 20))
+>U : Symbol(U, Decl(unionAndIntersectionInference1.ts, 86, 22))
+>x : Symbol(x, Decl(unionAndIntersectionInference1.ts, 86, 26))
+>T : Symbol(T, Decl(unionAndIntersectionInference1.ts, 86, 20))
+>U : Symbol(U, Decl(unionAndIntersectionInference1.ts, 86, 22))
+>T : Symbol(T, Decl(unionAndIntersectionInference1.ts, 86, 20))
+>U : Symbol(U, Decl(unionAndIntersectionInference1.ts, 86, 22))
+
+let x1: string = f1('a');
+>x1 : Symbol(x1, Decl(unionAndIntersectionInference1.ts, 88, 3))
+>f1 : Symbol(f1, Decl(unionAndIntersectionInference1.ts, 83, 1))
+
+let x2: string = f2('a');
+>x2 : Symbol(x2, Decl(unionAndIntersectionInference1.ts, 89, 3))
+>f2 : Symbol(f2, Decl(unionAndIntersectionInference1.ts, 85, 43))
+
diff --git a/tests/baselines/reference/unionAndIntersectionInference1.types b/tests/baselines/reference/unionAndIntersectionInference1.types
index 7b2515c6b58..4dddcb8bd0f 100644
--- a/tests/baselines/reference/unionAndIntersectionInference1.types
+++ b/tests/baselines/reference/unionAndIntersectionInference1.types
@@ -179,3 +179,56 @@ pigify(mbp).walks; // Ok, mbp is treated as Man
 >mbp : Man & Bear
 >walks : boolean
 
+// Repros from #29815
+
+interface ITest {
+  name: 'test'
+>name : "test"
+}
+
+const createTestAsync = (): Promise<ITest> => Promise.resolve().then(() => ({ name: 'test' }))
+>createTestAsync : () => Promise<ITest>
+>(): Promise<ITest> => Promise.resolve().then(() => ({ name: 'test' })) : () => Promise<ITest>
+>Promise.resolve().then(() => ({ name: 'test' })) : Promise<ITest | { name: "test"; }>
+>Promise.resolve().then : <TResult1 = void, TResult2 = never>(onfulfilled?: (value: void) => TResult1 | PromiseLike<TResult1>, onrejected?: (reason: any) => TResult2 | PromiseLike<TResult2>) => Promise<TResult1 | TResult2>
+>Promise.resolve() : Promise<void>
+>Promise.resolve : { <T>(value: T | PromiseLike<T>): Promise<T>; (): Promise<void>; }
+>Promise : PromiseConstructor
+>resolve : { <T>(value: T | PromiseLike<T>): Promise<T>; (): Promise<void>; }
+>then : <TResult1 = void, TResult2 = never>(onfulfilled?: (value: void) => TResult1 | PromiseLike<TResult1>, onrejected?: (reason: any) => TResult2 | PromiseLike<TResult2>) => Promise<TResult1 | TResult2>
+>() => ({ name: 'test' }) : () => { name: "test"; }
+>({ name: 'test' }) : { name: "test"; }
+>{ name: 'test' } : { name: "test"; }
+>name : "test"
+>'test' : "test"
+
+const createTest = (): ITest => {
+>createTest : () => ITest
+>(): ITest => {  return { name: 'test' }} : () => ITest
+
+  return { name: 'test' }
+>{ name: 'test' } : { name: "test"; }
+>name : "test"
+>'test' : "test"
+}
+
+declare function f1<T, U>(x: T | U): T | U;
+>f1 : <T, U>(x: T | U) => T | U
+>x : T | U
+
+declare function f2<T, U>(x: T & U): T & U;
+>f2 : <T, U>(x: T & U) => T & U
+>x : T & U
+
+let x1: string = f1('a');
+>x1 : string
+>f1('a') : "a"
+>f1 : <T, U>(x: T | U) => T | U
+>'a' : "a"
+
+let x2: string = f2('a');
+>x2 : string
+>f2('a') : "a"
+>f2 : <T, U>(x: T & U) => T & U
+>'a' : "a"
+
diff --git a/tests/baselines/reference/unionTypeWithIndexSignature.symbols b/tests/baselines/reference/unionTypeWithIndexSignature.symbols
index b207423057b..8d38cbb6403 100644
--- a/tests/baselines/reference/unionTypeWithIndexSignature.symbols
+++ b/tests/baselines/reference/unionTypeWithIndexSignature.symbols
@@ -87,7 +87,7 @@ num['0'] = 'ok'
 
 const sym = Symbol()
 >sym : Symbol(sym, Decl(unionTypeWithIndexSignature.ts, 18, 5))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 
 type Both = { s: number, '0': number, [sym]: boolean } | { [n: number]: number, [s: string]: string | number }
 >Both : Symbol(Both, Decl(unionTypeWithIndexSignature.ts, 18, 20))
diff --git a/tests/baselines/reference/uniqueSymbols.symbols b/tests/baselines/reference/uniqueSymbols.symbols
index 377d84ff58f..2df23f1fc95 100644
--- a/tests/baselines/reference/uniqueSymbols.symbols
+++ b/tests/baselines/reference/uniqueSymbols.symbols
@@ -2,15 +2,15 @@
 // declarations with call initializer
 const constCall = Symbol();
 >constCall : Symbol(constCall, Decl(uniqueSymbols.ts, 1, 5))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 
 let letCall = Symbol();
 >letCall : Symbol(letCall, Decl(uniqueSymbols.ts, 2, 3))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 
 var varCall = Symbol();
 >varCall : Symbol(varCall, Decl(uniqueSymbols.ts, 3, 3))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 
 // ambient declaration with type
 declare const constType: unique symbol;
@@ -19,7 +19,7 @@ declare const constType: unique symbol;
 // declaration with type and call initializer
 const constTypeAndCall: unique symbol = Symbol();
 >constTypeAndCall : Symbol(constTypeAndCall, Decl(uniqueSymbols.ts, 9, 5))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 
 // declaration from initializer
 const constInitToConstCall = constCall;
@@ -157,26 +157,26 @@ class C {
 
     static readonly readonlyStaticCall = Symbol();
 >readonlyStaticCall : Symbol(C.readonlyStaticCall, Decl(uniqueSymbols.ts, 60, 9))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 
     static readonly readonlyStaticType: unique symbol;
 >readonlyStaticType : Symbol(C.readonlyStaticType, Decl(uniqueSymbols.ts, 61, 50))
 
     static readonly readonlyStaticTypeAndCall: unique symbol = Symbol();
 >readonlyStaticTypeAndCall : Symbol(C.readonlyStaticTypeAndCall, Decl(uniqueSymbols.ts, 62, 54))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 
     static readwriteStaticCall = Symbol();
 >readwriteStaticCall : Symbol(C.readwriteStaticCall, Decl(uniqueSymbols.ts, 63, 72))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 
     readonly readonlyCall = Symbol();
 >readonlyCall : Symbol(C.readonlyCall, Decl(uniqueSymbols.ts, 64, 42))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 
     readwriteCall = Symbol();
 >readwriteCall : Symbol(C.readwriteCall, Decl(uniqueSymbols.ts, 66, 37))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 }
 declare const c: C;
 >c : Symbol(c, Decl(uniqueSymbols.ts, 69, 13))
diff --git a/tests/baselines/reference/uniqueSymbolsDeclarations.symbols b/tests/baselines/reference/uniqueSymbolsDeclarations.symbols
index eea10ac2604..56024cf1cfb 100644
--- a/tests/baselines/reference/uniqueSymbolsDeclarations.symbols
+++ b/tests/baselines/reference/uniqueSymbolsDeclarations.symbols
@@ -2,15 +2,15 @@
 // declarations with call initializer
 const constCall = Symbol();
 >constCall : Symbol(constCall, Decl(uniqueSymbolsDeclarations.ts, 1, 5))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 
 let letCall = Symbol();
 >letCall : Symbol(letCall, Decl(uniqueSymbolsDeclarations.ts, 2, 3))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 
 var varCall = Symbol();
 >varCall : Symbol(varCall, Decl(uniqueSymbolsDeclarations.ts, 3, 3))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 
 // ambient declaration with type
 declare const constType: unique symbol;
@@ -19,7 +19,7 @@ declare const constType: unique symbol;
 // declaration with type and call initializer
 const constTypeAndCall: unique symbol = Symbol();
 >constTypeAndCall : Symbol(constTypeAndCall, Decl(uniqueSymbolsDeclarations.ts, 9, 5))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 
 // declaration from initializer
 const constInitToConstCall = constCall;
@@ -152,26 +152,26 @@ class C {
 
     static readonly readonlyStaticCall = Symbol();
 >readonlyStaticCall : Symbol(C.readonlyStaticCall, Decl(uniqueSymbolsDeclarations.ts, 56, 9))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 
     static readonly readonlyStaticType: unique symbol;
 >readonlyStaticType : Symbol(C.readonlyStaticType, Decl(uniqueSymbolsDeclarations.ts, 57, 50))
 
     static readonly readonlyStaticTypeAndCall: unique symbol = Symbol();
 >readonlyStaticTypeAndCall : Symbol(C.readonlyStaticTypeAndCall, Decl(uniqueSymbolsDeclarations.ts, 58, 54))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 
     static readwriteStaticCall = Symbol();
 >readwriteStaticCall : Symbol(C.readwriteStaticCall, Decl(uniqueSymbolsDeclarations.ts, 59, 72))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 
     readonly readonlyCall = Symbol();
 >readonlyCall : Symbol(C.readonlyCall, Decl(uniqueSymbolsDeclarations.ts, 60, 42))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 
     readwriteCall = Symbol();
 >readwriteCall : Symbol(C.readwriteCall, Decl(uniqueSymbolsDeclarations.ts, 62, 37))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 }
 declare const c: C;
 >c : Symbol(c, Decl(uniqueSymbolsDeclarations.ts, 65, 13))
diff --git a/tests/baselines/reference/uniqueSymbolsErrors.symbols b/tests/baselines/reference/uniqueSymbolsErrors.symbols
index affcd6f096b..2e2b552225a 100644
--- a/tests/baselines/reference/uniqueSymbolsErrors.symbols
+++ b/tests/baselines/reference/uniqueSymbolsErrors.symbols
@@ -238,5 +238,5 @@ declare const invalidIntersection: unique symbol | unique symbol;
 // https://github.com/Microsoft/TypeScript/issues/21584
 const shouldNotBeAssignable: string = Symbol();
 >shouldNotBeAssignable : Symbol(shouldNotBeAssignable, Decl(uniqueSymbolsErrors.ts, 86, 5))
->Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.esnext.symbol.d.ts, --, --))
+>Symbol : Symbol(Symbol, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2019.symbol.d.ts, --, --))
 
diff --git a/tests/baselines/reference/user/chrome-devtools-frontend.log b/tests/baselines/reference/user/chrome-devtools-frontend.log
index 7ae2531d383..55c189a92d6 100644
--- a/tests/baselines/reference/user/chrome-devtools-frontend.log
+++ b/tests/baselines/reference/user/chrome-devtools-frontend.log
@@ -1,16 +1,16 @@
 Exit Code: 1
 Standard output:
-../../../../built/local/lib.dom.d.ts(2388,11): error TS2300: Duplicate identifier 'CSSRule'.
-../../../../built/local/lib.dom.d.ts(2407,13): error TS2300: Duplicate identifier 'CSSRule'.
-../../../../built/local/lib.dom.d.ts(3267,11): error TS2300: Duplicate identifier 'Comment'.
-../../../../built/local/lib.dom.d.ts(3270,13): error TS2300: Duplicate identifier 'Comment'.
-../../../../built/local/lib.dom.d.ts(4963,11): error TS2300: Duplicate identifier 'Event'.
-../../../../built/local/lib.dom.d.ts(5023,13): error TS2300: Duplicate identifier 'Event'.
-../../../../built/local/lib.dom.d.ts(11214,11): error TS2300: Duplicate identifier 'Position'.
-../../../../built/local/lib.dom.d.ts(11959,11): error TS2300: Duplicate identifier 'Request'.
-../../../../built/local/lib.dom.d.ts(12039,13): error TS2300: Duplicate identifier 'Request'.
-../../../../built/local/lib.dom.d.ts(16513,11): error TS2300: Duplicate identifier 'Window'.
-../../../../built/local/lib.dom.d.ts(16644,13): error TS2300: Duplicate identifier 'Window'.
+../../../../built/local/lib.dom.d.ts(2439,11): error TS2300: Duplicate identifier 'CSSRule'.
+../../../../built/local/lib.dom.d.ts(2458,13): error TS2300: Duplicate identifier 'CSSRule'.
+../../../../built/local/lib.dom.d.ts(3339,11): error TS2300: Duplicate identifier 'Comment'.
+../../../../built/local/lib.dom.d.ts(3342,13): error TS2300: Duplicate identifier 'Comment'.
+../../../../built/local/lib.dom.d.ts(5032,11): error TS2300: Duplicate identifier 'Event'.
+../../../../built/local/lib.dom.d.ts(5092,13): error TS2300: Duplicate identifier 'Event'.
+../../../../built/local/lib.dom.d.ts(11453,11): error TS2300: Duplicate identifier 'Position'.
+../../../../built/local/lib.dom.d.ts(12214,11): error TS2300: Duplicate identifier 'Request'.
+../../../../built/local/lib.dom.d.ts(12294,13): error TS2300: Duplicate identifier 'Request'.
+../../../../built/local/lib.dom.d.ts(16941,11): error TS2300: Duplicate identifier 'Window'.
+../../../../built/local/lib.dom.d.ts(17073,13): error TS2300: Duplicate identifier 'Window'.
 ../../../../built/local/lib.es5.d.ts(1416,11): error TS2300: Duplicate identifier 'ArrayLike'.
 ../../../../built/local/lib.es5.d.ts(1452,6): error TS2300: Duplicate identifier 'Record'.
 ../../../../node_modules/@types/node/index.d.ts(150,13): error TS2403: Subsequent variable declarations must have the same type.  Variable 'module' must be of type '{}', but here has type 'NodeModule'.
@@ -158,7 +158,7 @@ node_modules/chrome-devtools-frontend/front_end/accessibility/AXBreadcrumbsPane.
 node_modules/chrome-devtools-frontend/front_end/accessibility/AXBreadcrumbsPane.js(391,50): error TS2345: Argument of type '0' is not assignable to parameter of type 'string'.
 node_modules/chrome-devtools-frontend/front_end/accessibility/AXBreadcrumbsPane.js(393,50): error TS2345: Argument of type '-1' is not assignable to parameter of type 'string'.
 node_modules/chrome-devtools-frontend/front_end/accessibility/AXBreadcrumbsPane.js(396,27): error TS2339: Property 'focus' does not exist on type 'Element'.
-node_modules/chrome-devtools-frontend/front_end/accessibility/AXBreadcrumbsPane.js(447,26): error TS2339: Property 'breadcrumb' does not exist on type 'Node'.
+node_modules/chrome-devtools-frontend/front_end/accessibility/AXBreadcrumbsPane.js(447,26): error TS2339: Property 'breadcrumb' does not exist on type 'ChildNode'.
 node_modules/chrome-devtools-frontend/front_end/accessibility/AXBreadcrumbsPane.js(457,30): error TS2339: Property 'breadcrumb' does not exist on type 'Node'.
 node_modules/chrome-devtools-frontend/front_end/accessibility/AXBreadcrumbsPane.js(473,24): error TS2694: Namespace 'Protocol' has no exported member 'Accessibility'.
 node_modules/chrome-devtools-frontend/front_end/accessibility/AXBreadcrumbsPane.js(481,17): error TS2339: Property 'setTextContentTruncatedIfNeeded' does not exist on type 'Element'.
@@ -699,10 +699,6 @@ node_modules/chrome-devtools-frontend/front_end/audits2_worker/lighthouse/lighth
 node_modules/chrome-devtools-frontend/front_end/audits2_worker/lighthouse/lighthouse-background.js(9093,1): error TS2554: Expected 0-2 arguments, but got 3.
 node_modules/chrome-devtools-frontend/front_end/audits2_worker/lighthouse/lighthouse-background.js(9117,1): error TS2554: Expected 0-2 arguments, but got 3.
 node_modules/chrome-devtools-frontend/front_end/audits2_worker/lighthouse/lighthouse-background.js(9467,15): error TS2339: Property 'axe' does not exist on type 'Window'.
-node_modules/chrome-devtools-frontend/front_end/audits2_worker/lighthouse/lighthouse-background.js(9708,34): error TS2345: Argument of type 'any[][]' is not assignable to parameter of type 'readonly [any, any][]'.
-  Type 'any[]' is missing the following properties from type '[any, any]': 0, 1
-node_modules/chrome-devtools-frontend/front_end/audits2_worker/lighthouse/lighthouse-background.js(9948,10): error TS2693: 'ShadowRoot' only refers to a type, but is being used as a value here.
-node_modules/chrome-devtools-frontend/front_end/audits2_worker/lighthouse/lighthouse-background.js(9969,4): error TS2693: 'ShadowRoot' only refers to a type, but is being used as a value here.
 node_modules/chrome-devtools-frontend/front_end/audits2_worker/lighthouse/lighthouse-background.js(10092,16): error TS2304: Cannot find name 'd41d8cd98f00b204e9800998ecf8427e_LibraryDetectorTests'.
 node_modules/chrome-devtools-frontend/front_end/audits2_worker/lighthouse/lighthouse-background.js(10513,19): error TS2488: Type 'NodeListOf<Element>' must have a '[Symbol.iterator]()' method that returns an iterator.
 node_modules/chrome-devtools-frontend/front_end/audits2_worker/lighthouse/lighthouse-background.js(10811,19): error TS2304: Cannot find name 'getElementsInDocument'.
@@ -3755,6 +3751,7 @@ node_modules/chrome-devtools-frontend/front_end/common/ParsedURL.js(152,25): err
 node_modules/chrome-devtools-frontend/front_end/common/ParsedURL.js(161,25): error TS2339: Property 'asParsedURL' does not exist on type 'string'.
 node_modules/chrome-devtools-frontend/front_end/common/ParsedURL.js(211,34): error TS2339: Property 'asParsedURL' does not exist on type 'string'.
 node_modules/chrome-devtools-frontend/front_end/common/ParsedURL.js(215,29): error TS2339: Property 'asParsedURL' does not exist on type 'string'.
+node_modules/chrome-devtools-frontend/front_end/common/ParsedURL.js(318,32): error TS2554: Expected 0 arguments, but got 1.
 node_modules/chrome-devtools-frontend/front_end/common/ParsedURL.js(375,18): error TS2339: Property 'asParsedURL' does not exist on type 'String'.
 node_modules/chrome-devtools-frontend/front_end/common/SegmentedRange.js(48,37): error TS2339: Property 'lowerBound' does not exist on type 'Segment[]'.
 node_modules/chrome-devtools-frontend/front_end/common/Settings.js(49,10): error TS2339: Property 'runtime' does not exist on type 'Window'.
@@ -3906,6 +3903,7 @@ node_modules/chrome-devtools-frontend/front_end/console/ConsoleContextSelector.j
 node_modules/chrome-devtools-frontend/front_end/console/ConsoleContextSelector.js(192,22): error TS2694: Namespace 'Common' has no exported member 'Event'.
 node_modules/chrome-devtools-frontend/front_end/console/ConsoleContextSelector.js(200,22): error TS2694: Namespace 'Common' has no exported member 'Event'.
 node_modules/chrome-devtools-frontend/front_end/console/ConsoleContextSelector.js(255,28): error TS2339: Property 'createChild' does not exist on type 'DocumentFragment'.
+node_modules/chrome-devtools-frontend/front_end/console/ConsoleContextSelector.js(256,27): error TS2554: Expected 0 arguments, but got 1.
 node_modules/chrome-devtools-frontend/front_end/console/ConsoleContextSelector.js(257,31): error TS2339: Property 'createChild' does not exist on type 'DocumentFragment'.
 node_modules/chrome-devtools-frontend/front_end/console/ConsoleContextSelector.js(264,13): error TS2339: Property 'style' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/console/ConsoleContextSelector.js(279,14): error TS2555: Expected at least 2 arguments, but got 1.
@@ -3981,7 +3979,7 @@ node_modules/chrome-devtools-frontend/front_end/console/ConsoleSidebar.js(107,9)
 node_modules/chrome-devtools-frontend/front_end/console/ConsoleSidebar.js(111,9): error TS2339: Property 'ConsoleSidebar' does not exist on type '{ new (): Console; prototype: Console; }'.
 node_modules/chrome-devtools-frontend/front_end/console/ConsoleSidebar.js(119,47): error TS2339: Property 'createChild' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/console/ConsoleSidebar.js(122,25): error TS2345: Argument of type 'Element' is not assignable to parameter of type 'Icon'.
-  Type 'Element' is missing the following properties from type 'Icon': createdCallback, _descriptor, _spriteSheet, _iconType, and 116 more.
+  Type 'Element' is missing the following properties from type 'Icon': createdCallback, _descriptor, _spriteSheet, _iconType, and 117 more.
 node_modules/chrome-devtools-frontend/front_end/console/ConsoleSidebar.js(133,9): error TS2339: Property 'ConsoleSidebar' does not exist on type '{ new (): Console; prototype: Console; }'.
 node_modules/chrome-devtools-frontend/front_end/console/ConsoleSidebar.js(147,27): error TS2322: Type 'Element' is not assignable to type 'Icon'.
 node_modules/chrome-devtools-frontend/front_end/console/ConsoleSidebar.js(177,60): error TS2555: Expected at least 2 arguments, but got 1.
@@ -4184,6 +4182,7 @@ node_modules/chrome-devtools-frontend/front_end/console/ConsoleViewMessage.js(70
 node_modules/chrome-devtools-frontend/front_end/console/ConsoleViewMessage.js(733,19): error TS2339: Property 'removeChildren' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/console/ConsoleViewMessage.js(735,35): error TS2339: Property 'createChild' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/console/ConsoleViewMessage.js(736,31): error TS2555: Expected at least 2 arguments, but got 1.
+node_modules/chrome-devtools-frontend/front_end/console/ConsoleViewMessage.js(750,27): error TS2554: Expected 0 arguments, but got 1.
 node_modules/chrome-devtools-frontend/front_end/console/ConsoleViewMessage.js(803,34): error TS2339: Property 'style' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/console/ConsoleViewMessage.js(804,31): error TS2339: Property 'style' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/console/ConsoleViewMessage.js(806,43): error TS2339: Property 'style' does not exist on type 'Element'.
@@ -4521,6 +4520,7 @@ node_modules/chrome-devtools-frontend/front_end/data_grid/DataGrid.js(98,48): er
 node_modules/chrome-devtools-frontend/front_end/data_grid/DataGrid.js(109,26): error TS2352: Conversion of type 'DataGridNode<any>' to type 'NODE_TYPE' may be a mistake because neither type sufficiently overlaps with the other. If this was intentional, convert the expression to 'unknown' first.
 node_modules/chrome-devtools-frontend/front_end/data_grid/DataGrid.js(121,17): error TS7014: Function type, which lacks return-type annotation, implicitly has an 'any' return type.
 node_modules/chrome-devtools-frontend/front_end/data_grid/DataGrid.js(123,17): error TS7014: Function type, which lacks return-type annotation, implicitly has an 'any' return type.
+node_modules/chrome-devtools-frontend/front_end/data_grid/DataGrid.js(134,29): error TS2554: Expected 0 arguments, but got 1.
 node_modules/chrome-devtools-frontend/front_end/data_grid/DataGrid.js(135,15): error TS2339: Property 'title' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/data_grid/DataGrid.js(139,15): error TS2339: Property 'title' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/data_grid/DataGrid.js(159,33): error TS2694: Namespace 'DataGrid.DataGrid' has no exported member 'ColumnDescriptor'.
@@ -5065,8 +5065,6 @@ node_modules/chrome-devtools-frontend/front_end/dom_extension/DOMExtension.js(25
 node_modules/chrome-devtools-frontend/front_end/dom_extension/DOMExtension.js(253,61): error TS2339: Property 'host' does not exist on type 'Node'.
 node_modules/chrome-devtools-frontend/front_end/dom_extension/DOMExtension.js(254,17): error TS2339: Property 'host' does not exist on type 'Node'.
 node_modules/chrome-devtools-frontend/front_end/dom_extension/DOMExtension.js(261,16): error TS2339: Property 'getComponentSelection' does not exist on type 'Node'.
-node_modules/chrome-devtools-frontend/front_end/dom_extension/DOMExtension.js(265,28): error TS2693: 'ShadowRoot' only refers to a type, but is being used as a value here.
-node_modules/chrome-devtools-frontend/front_end/dom_extension/DOMExtension.js(265,48): error TS2339: Property 'getSelection' does not exist on type 'Node & ParentNode'.
 node_modules/chrome-devtools-frontend/front_end/dom_extension/DOMExtension.js(265,70): error TS2339: Property 'window' does not exist on type 'Node'.
 node_modules/chrome-devtools-frontend/front_end/dom_extension/DOMExtension.js(271,16): error TS2339: Property 'hasSelection' does not exist on type 'Node'.
 node_modules/chrome-devtools-frontend/front_end/dom_extension/DOMExtension.js(273,23): error TS2339: Property 'querySelectorAll' does not exist on type 'Node'.
@@ -5149,7 +5147,7 @@ node_modules/chrome-devtools-frontend/front_end/dom_extension/DOMExtension.js(74
 node_modules/chrome-devtools-frontend/front_end/dom_extension/DOMExtension.js(745,48): error TS2339: Property 'pageX' does not exist on type 'Event'.
 node_modules/chrome-devtools-frontend/front_end/dom_extension/DOMExtension.js(745,60): error TS2339: Property 'pageY' does not exist on type 'Event'.
 node_modules/chrome-devtools-frontend/front_end/dom_extension/DOMExtension.js(753,20): error TS2339: Property 'deepElementFromPoint' does not exist on type 'Document'.
-node_modules/chrome-devtools-frontend/front_end/dom_extension/DOMExtension.js(761,5): error TS2740: Type 'ShadowRoot' is missing the following properties from type 'Document': URL, alinkColor, all, anchors, and 169 more.
+node_modules/chrome-devtools-frontend/front_end/dom_extension/DOMExtension.js(761,5): error TS2740: Type 'ShadowRoot' is missing the following properties from type 'Document': URL, alinkColor, all, anchors, and 174 more.
 node_modules/chrome-devtools-frontend/front_end/dom_extension/DOMExtension.js(766,28): error TS2339: Property 'deepElementFromPoint' does not exist on type 'DocumentFragment'.
 node_modules/chrome-devtools-frontend/front_end/dom_extension/DOMExtension.js(766,70): error TS2339: Property 'deepElementFromPoint' does not exist on type 'Document'.
 node_modules/chrome-devtools-frontend/front_end/dom_extension/DOMExtension.js(771,20): error TS2339: Property 'deepActiveElement' does not exist on type 'Document'.
@@ -5367,7 +5365,7 @@ node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(
 node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(575,10): error TS2339: Property 'style' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(576,10): error TS2339: Property 'style' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(580,10): error TS2339: Property 'scrollIntoViewIfNeeded' does not exist on type 'Element'.
-node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(592,20): error TS2339: Property 'classList' does not exist on type 'Node'.
+node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(592,20): error TS2339: Property 'classList' does not exist on type 'ChildNode'.
 node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(600,41): error TS2339: Property 'isAncestor' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(632,27): error TS2555: Expected at least 2 arguments, but got 1.
 node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(655,26): error TS2339: Property 'getComponentSelection' does not exist on type 'Element'.
@@ -5377,7 +5375,6 @@ node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(
 node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(738,14): error TS7014: Function type, which lacks return-type annotation, implicitly has an 'any' return type.
 node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(739,14): error TS7014: Function type, which lacks return-type annotation, implicitly has an 'any' return type.
 node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(762,13): error TS2339: Property 'style' does not exist on type 'ChildNode'.
-node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(763,7): error TS2739: Type 'Node' is missing the following properties from type 'ChildNode': after, before, remove, replaceWith
 node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(767,32): error TS2339: Property 'style' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(772,10): error TS2339: Property 'runtime' does not exist on type 'Window'.
 node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(796,24): error TS2339: Property 'setMultilineEditing' does not exist on type 'TreeOutline'.
@@ -5385,7 +5382,6 @@ node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(
 node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(803,60): error TS2339: Property 'visibleWidth' does not exist on type 'TreeOutline'.
 node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(828,34): error TS2339: Property 'style' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(832,15): error TS2339: Property 'style' does not exist on type 'ChildNode'.
-node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(833,9): error TS2322: Type 'Node' is not assignable to type 'ChildNode'.
 node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(837,26): error TS2339: Property 'setMultilineEditing' does not exist on type 'TreeOutline'.
 node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(851,18): error TS2339: Property 'altKey' does not exist on type 'Event'.
 node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeElement.js(851,35): error TS2339: Property 'shiftKey' does not exist on type 'Event'.
@@ -5466,7 +5462,7 @@ node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeOutline.js(
 node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeOutline.js(755,33): error TS2339: Property 'enclosingNodeOrSelfWithClass' does not exist on type 'EventTarget'.
 node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeOutline.js(758,36): error TS2339: Property 'enclosingNodeOrSelfWithClass' does not exist on type 'EventTarget'.
 node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeOutline.js(813,22): error TS2339: Property 'index' does not exist on type 'DOMNode'.
-node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeOutline.js(920,9): error TS2740: Type 'Node & ParentNode' is missing the following properties from type 'Element': assignedSlot, attributes, classList, className, and 63 more.
+node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeOutline.js(920,9): error TS2740: Type 'Node & ParentNode' is missing the following properties from type 'Element': assignedSlot, attributes, classList, className, and 64 more.
 node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeOutline.js(930,13): error TS2339: Property 'type' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeOutline.js(1010,22): error TS2694: Namespace 'Common' has no exported member 'Event'.
 node_modules/chrome-devtools-frontend/front_end/elements/ElementsTreeOutline.js(1025,22): error TS2694: Namespace 'Common' has no exported member 'Event'.
@@ -5658,14 +5654,13 @@ node_modules/chrome-devtools-frontend/front_end/elements/StylesSidebarPane.js(10
 node_modules/chrome-devtools-frontend/front_end/elements/StylesSidebarPane.js(1040,69): error TS2339: Property 'selectorText' does not exist on type 'CSSRule'.
 node_modules/chrome-devtools-frontend/front_end/elements/StylesSidebarPane.js(1055,24): error TS2339: Property '_section' does not exist on type 'ChildNode'.
 node_modules/chrome-devtools-frontend/front_end/elements/StylesSidebarPane.js(1056,29): error TS2339: Property '_section' does not exist on type 'ChildNode'.
-node_modules/chrome-devtools-frontend/front_end/elements/StylesSidebarPane.js(1057,7): error TS2322: Type 'Node' is not assignable to type 'ChildNode'.
 node_modules/chrome-devtools-frontend/front_end/elements/StylesSidebarPane.js(1073,24): error TS2339: Property '_section' does not exist on type 'ChildNode'.
 node_modules/chrome-devtools-frontend/front_end/elements/StylesSidebarPane.js(1074,29): error TS2339: Property '_section' does not exist on type 'ChildNode'.
-node_modules/chrome-devtools-frontend/front_end/elements/StylesSidebarPane.js(1075,7): error TS2322: Type 'Node' is not assignable to type 'ChildNode'.
-node_modules/chrome-devtools-frontend/front_end/elements/StylesSidebarPane.js(1087,7): error TS2740: Type 'Node' is missing the following properties from type 'Element': assignedSlot, attributes, classList, className, and 71 more.
+node_modules/chrome-devtools-frontend/front_end/elements/StylesSidebarPane.js(1075,7): error TS2739: Type 'Node' is missing the following properties from type 'ChildNode': after, before, remove, replaceWith
+node_modules/chrome-devtools-frontend/front_end/elements/StylesSidebarPane.js(1087,7): error TS2740: Type 'ChildNode' is missing the following properties from type 'Element': assignedSlot, attributes, classList, className, and 68 more.
 node_modules/chrome-devtools-frontend/front_end/elements/StylesSidebarPane.js(1088,38): error TS2339: Property '_section' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/elements/StylesSidebarPane.js(1090,36): error TS2339: Property '_section' does not exist on type 'Element'.
-node_modules/chrome-devtools-frontend/front_end/elements/StylesSidebarPane.js(1099,7): error TS2322: Type 'Node' is not assignable to type 'Element'.
+node_modules/chrome-devtools-frontend/front_end/elements/StylesSidebarPane.js(1099,7): error TS2740: Type 'Node' is missing the following properties from type 'Element': assignedSlot, attributes, classList, className, and 72 more.
 node_modules/chrome-devtools-frontend/front_end/elements/StylesSidebarPane.js(1100,38): error TS2339: Property '_section' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/elements/StylesSidebarPane.js(1102,36): error TS2339: Property '_section' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/elements/StylesSidebarPane.js(1106,22): error TS2694: Namespace 'Common' has no exported member 'Event'.
@@ -6143,7 +6138,6 @@ node_modules/chrome-devtools-frontend/front_end/extensions/ExtensionServer.js(13
 node_modules/chrome-devtools-frontend/front_end/extensions/ExtensionServer.js(161,5): error TS2555: Expected at least 2 arguments, but got 1.
 node_modules/chrome-devtools-frontend/front_end/extensions/ExtensionServer.js(219,43): error TS2694: Namespace 'Protocol' has no exported member 'Network'.
 node_modules/chrome-devtools-frontend/front_end/extensions/ExtensionServer.js(244,54): error TS2339: Property 'traverseNextNode' does not exist on type 'HTMLElement'.
-node_modules/chrome-devtools-frontend/front_end/extensions/ExtensionServer.js(245,27): error TS2693: 'ShadowRoot' only refers to a type, but is being used as a value here.
 node_modules/chrome-devtools-frontend/front_end/extensions/ExtensionServer.js(463,53): error TS2345: Argument of type '{ url: string; type: string; }' is not assignable to parameter of type '{ contentURL(): string; contentType(): ResourceType; contentEncoded(): Promise<boolean>; requestContent(): Promise<string>; searchInContent(query: string, caseSensitive: boolean, isRegex: boolean): Promise<...>; }'.
   Type '{ url: string; type: string; }' is missing the following properties from type '{ contentURL(): string; contentType(): ResourceType; contentEncoded(): Promise<boolean>; requestContent(): Promise<string>; searchInContent(query: string, caseSensitive: boolean, isRegex: boolean): Promise<...>; }': contentURL, contentType, contentEncoded, requestContent, searchInContent
 node_modules/chrome-devtools-frontend/front_end/extensions/ExtensionServer.js(471,22): error TS2339: Property 'valuesArray' does not exist on type 'Map<string, { contentURL(): string; contentType(): ResourceType; contentEncoded(): Promise<boolean>; requestContent(): Promise<string>; searchInContent(query: string, caseSensitive: boolean, isRegex: boolean): Promise<...>; }>'.
@@ -6927,7 +6921,6 @@ node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(852
 node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(858,13): error TS2339: Property 'image' does not exist on type 'WebGLTexture'.
 node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(861,81): error TS2339: Property 'image' does not exist on type 'WebGLTexture'.
 node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(928,26): error TS2694: Namespace 'SDK' has no exported member 'SnapshotWithRect'.
-node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(932,39): error TS2345: Argument of type 'any[][]' is not assignable to parameter of type 'readonly [any, any][]'.
 node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(1080,24): error TS2694: Namespace 'Protocol' has no exported member 'DOM'.
 node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(1098,15): error TS2304: Cannot find name 'CSSMatrix'.
 node_modules/chrome-devtools-frontend/front_end/layer_viewer/Layers3DView.js(1143,19): error TS2694: Namespace 'SDK' has no exported member 'SnapshotWithRect'.
@@ -7762,6 +7755,7 @@ node_modules/chrome-devtools-frontend/front_end/object_ui/JavaScriptAutocomplete
 node_modules/chrome-devtools-frontend/front_end/object_ui/JavaScriptAutocomplete.js(471,33): error TS2339: Property 'CompletionGroup' does not exist on type 'typeof JavaScriptAutocomplete'.
 node_modules/chrome-devtools-frontend/front_end/object_ui/ObjectPopoverHelper.js(82,35): error TS2694: Namespace 'SDK.DebuggerModel' has no exported member 'FunctionDetails'.
 node_modules/chrome-devtools-frontend/front_end/object_ui/ObjectPopoverHelper.js(91,29): error TS2339: Property 'createChild' does not exist on type 'Element'.
+node_modules/chrome-devtools-frontend/front_end/object_ui/ObjectPopoverHelper.js(108,23): error TS2554: Expected 0 arguments, but got 1.
 node_modules/chrome-devtools-frontend/front_end/object_ui/ObjectPopoverHelper.js(114,48): error TS2339: Property 'createChild' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/object_ui/ObjectPopoverHelper.js(129,7): error TS2722: Cannot invoke an object which is possibly 'undefined'.
 node_modules/chrome-devtools-frontend/front_end/object_ui/ObjectPopoverHelper.js(145,50): error TS2339: Property 'createChild' does not exist on type 'Element'.
@@ -7774,6 +7768,7 @@ node_modules/chrome-devtools-frontend/front_end/object_ui/ObjectPropertiesSectio
 node_modules/chrome-devtools-frontend/front_end/object_ui/ObjectPropertiesSection.js(181,18): error TS2339: Property 'title' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/object_ui/ObjectPropertiesSection.js(207,22): error TS2339: Property 'createChild' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/object_ui/ObjectPropertiesSection.js(209,22): error TS2339: Property 'createTextChild' does not exist on type 'Element'.
+node_modules/chrome-devtools-frontend/front_end/object_ui/ObjectPropertiesSection.js(209,38): error TS2554: Expected 0 arguments, but got 1.
 node_modules/chrome-devtools-frontend/front_end/object_ui/ObjectPropertiesSection.js(211,22): error TS2339: Property 'createTextChild' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/object_ui/ObjectPropertiesSection.js(263,20): error TS2339: Property 'title' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/object_ui/ObjectPropertiesSection.js(268,22): error TS2339: Property 'setTextContentTruncatedIfNeeded' does not exist on type 'Element'.
@@ -8059,8 +8054,8 @@ node_modules/chrome-devtools-frontend/front_end/perf_ui/TimelineGrid.js(189,25):
 node_modules/chrome-devtools-frontend/front_end/perf_ui/TimelineGrid.js(196,23): error TS2339: Property '_labelElement' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/perf_ui/TimelineGrid.js(199,15): error TS2339: Property 'style' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/perf_ui/TimelineGrid.js(200,23): error TS2339: Property 'style' does not exist on type 'Element'.
-node_modules/chrome-devtools-frontend/front_end/perf_ui/TimelineGrid.js(210,7): error TS2322: Type 'Node' is not assignable to type 'Element'.
-node_modules/chrome-devtools-frontend/front_end/perf_ui/TimelineGrid.js(215,7): error TS2322: Type 'Node' is not assignable to type 'Element'.
+node_modules/chrome-devtools-frontend/front_end/perf_ui/TimelineGrid.js(210,7): error TS2322: Type 'ChildNode' is not assignable to type 'Element'.
+node_modules/chrome-devtools-frontend/front_end/perf_ui/TimelineGrid.js(215,7): error TS2322: Type 'ChildNode' is not assignable to type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/perf_ui/TimelineGrid.js(267,21): error TS2339: Property 'DividersData' does not exist on type 'typeof TimelineGrid'.
 node_modules/chrome-devtools-frontend/front_end/perf_ui/TimelineGrid.js(277,15): error TS2355: A function whose declared type is neither 'void' nor 'any' must return a value.
 node_modules/chrome-devtools-frontend/front_end/perf_ui/TimelineGrid.js(284,15): error TS2355: A function whose declared type is neither 'void' nor 'any' must return a value.
@@ -8253,6 +8248,7 @@ node_modules/chrome-devtools-frontend/front_end/platform/utilities.js(125,15): e
 node_modules/chrome-devtools-frontend/front_end/platform/utilities.js(125,39): error TS2339: Property 'regexSpecialCharacters' does not exist on type 'StringConstructor'.
 node_modules/chrome-devtools-frontend/front_end/platform/utilities.js(132,8): error TS2339: Property 'filterRegex' does not exist on type 'StringConstructor'.
 node_modules/chrome-devtools-frontend/front_end/platform/utilities.js(133,27): error TS2339: Property 'regexSpecialCharacters' does not exist on type 'StringConstructor'.
+node_modules/chrome-devtools-frontend/front_end/platform/utilities.js(198,1): error TS2322: Type '(maxLength: number) => string' is not assignable to type '() => string'.
 node_modules/chrome-devtools-frontend/front_end/platform/utilities.js(250,8): error TS2339: Property 'hashCode' does not exist on type 'StringConstructor'.
 node_modules/chrome-devtools-frontend/front_end/platform/utilities.js(275,8): error TS2339: Property 'isDigitAt' does not exist on type 'StringConstructor'.
 node_modules/chrome-devtools-frontend/front_end/platform/utilities.js(320,8): error TS2339: Property 'naturalOrderComparator' does not exist on type 'StringConstructor'.
@@ -8343,7 +8339,212 @@ node_modules/chrome-devtools-frontend/front_end/product_registry/ProductRegistry
 node_modules/chrome-devtools-frontend/front_end/product_registry/ProductRegistry.js(34,15): error TS2355: A function whose declared type is neither 'void' nor 'any' must return a value.
 node_modules/chrome-devtools-frontend/front_end/product_registry/ProductRegistry.js(55,41): error TS2694: Namespace 'ProductRegistry.Registry' has no exported member 'ProductEntry'.
 node_modules/chrome-devtools-frontend/front_end/product_registry/ProductRegistry.js(72,26): error TS2339: Property 'ProductEntry' does not exist on type 'typeof Registry'.
-node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(1488,1): error TS2590: Expression produces a union type that is too complex to represent.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(1559,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(1563,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(1604,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(1605,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(1606,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(1865,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(2136,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(2136,64): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(2136,86): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(2208,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(2269,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(2270,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(2322,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(2323,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(2503,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(2856,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(2857,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(2858,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(2859,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(2860,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(2861,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(2862,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(2863,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(2864,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(2865,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(3126,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(3572,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(3573,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(3574,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(3575,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(3576,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(3747,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(3748,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(3770,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(3771,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(3772,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(3773,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(3774,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(3775,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(3776,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(3780,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(3819,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(3826,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(3873,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(3874,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(3957,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(3958,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(4068,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(4069,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(4138,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(4139,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(4203,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(4230,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(4260,104): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(4264,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(4265,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(4266,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(4312,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(4480,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(4832,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(4833,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(4834,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(4835,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5127,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5137,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5159,70): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5175,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5186,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5202,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5249,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5522,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5523,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5524,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5525,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5539,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5565,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5612,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5613,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5614,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5615,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5616,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5617,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5618,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5619,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5684,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5789,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5820,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5852,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5858,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5859,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5860,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5970,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5971,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(5972,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6145,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6151,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6152,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6153,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6154,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6180,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6181,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6182,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6183,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6184,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6185,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6186,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6187,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6193,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6194,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6195,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6196,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6197,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6198,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6199,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6217,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6218,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6225,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6227,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6228,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6229,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6230,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6231,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6232,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6233,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6243,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6270,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6272,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6276,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6294,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6296,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6297,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6298,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6299,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6300,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6303,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6305,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6323,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6324,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6325,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6326,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6327,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6333,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6334,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6335,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6336,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6337,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6338,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6339,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6340,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6341,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6342,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6343,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6344,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6345,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6346,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6347,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6348,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6349,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6350,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6351,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6360,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6361,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6362,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6363,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6364,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6365,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6369,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6382,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6388,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6389,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6404,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6405,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6406,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6425,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6441,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6442,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6445,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6481,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6521,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6560,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6573,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6574,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6575,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6576,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6577,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6578,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6579,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6580,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6581,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6582,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6583,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6615,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6620,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6629,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6637,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6661,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6668,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6675,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6689,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6690,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6699,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6726,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6735,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6737,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6738,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
+node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryData.js(6741,42): error TS2741: Property 'type' is missing in type '{ "product": number; }' but required in type '{ product: number; type: number; }'.
 node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryImpl.js(27,41): error TS2694: Namespace 'ProductRegistry.Registry' has no exported member 'ProductEntry'.
 node_modules/chrome-devtools-frontend/front_end/product_registry_impl/ProductRegistryImpl.js(103,67): error TS2694: Namespace 'ProductRegistry.Registry' has no exported member 'ProductEntry'.
 node_modules/chrome-devtools-frontend/front_end/profiler/BottomUpProfileDataGrid.js(83,15): error TS2339: Property '_remainingNodeInfos' does not exist on type 'ProfileDataGridNode'.
@@ -8772,8 +8973,6 @@ node_modules/chrome-devtools-frontend/front_end/profiler/ProfileView.js(57,23):
 node_modules/chrome-devtools-frontend/front_end/profiler/ProfileView.js(78,46): error TS2555: Expected at least 2 arguments, but got 1.
 node_modules/chrome-devtools-frontend/front_end/profiler/ProfileView.js(79,46): error TS2555: Expected at least 2 arguments, but got 1.
 node_modules/chrome-devtools-frontend/front_end/profiler/ProfileView.js(80,45): error TS2555: Expected at least 2 arguments, but got 1.
-node_modules/chrome-devtools-frontend/front_end/profiler/ProfileView.js(84,17): error TS2345: Argument of type '(string | Element)[][]' is not assignable to parameter of type 'readonly [any, any][]'.
-  Type '(string | Element)[]' is missing the following properties from type '[any, any]': 0, 1
 node_modules/chrome-devtools-frontend/front_end/profiler/ProfileView.js(136,59): error TS2339: Property 'profile' does not exist on type 'ProfileView'.
 node_modules/chrome-devtools-frontend/front_end/profiler/ProfileView.js(136,78): error TS2339: Property 'adjustedTotal' does not exist on type 'ProfileView'.
 node_modules/chrome-devtools-frontend/front_end/profiler/ProfileView.js(147,59): error TS2339: Property 'profile' does not exist on type 'ProfileView'.
@@ -10730,7 +10929,6 @@ node_modules/chrome-devtools-frontend/front_end/source_frame/XMLView.js(54,59):
 node_modules/chrome-devtools-frontend/front_end/source_frame/XMLView.js(73,28): error TS2339: Property 'setSearchRegex' does not exist on type 'TreeElement'.
 node_modules/chrome-devtools-frontend/front_end/source_frame/XMLView.js(80,23): error TS2339: Property 'setSearchRegex' does not exist on type 'TreeElement'.
 node_modules/chrome-devtools-frontend/front_end/source_frame/XMLView.js(223,35): error TS2339: Property 'childElementCount' does not exist on type 'Node'.
-node_modules/chrome-devtools-frontend/front_end/source_frame/XMLView.js(242,7): error TS2322: Type 'Node' is not assignable to type 'ChildNode'.
 node_modules/chrome-devtools-frontend/front_end/source_frame/XMLView.js(290,24): error TS2339: Property 'tagName' does not exist on type 'Node'.
 node_modules/chrome-devtools-frontend/front_end/source_frame/XMLView.js(296,31): error TS2339: Property 'attributes' does not exist on type 'Node'.
 node_modules/chrome-devtools-frontend/front_end/source_frame/XMLView.js(305,20): error TS2339: Property 'childElementCount' does not exist on type 'Node'.
@@ -10860,9 +11058,8 @@ node_modules/chrome-devtools-frontend/front_end/sources/JavaScriptBreakpointsSid
 node_modules/chrome-devtools-frontend/front_end/sources/JavaScriptBreakpointsSidebarPane.js(80,71): error TS2339: Property 'uiLocation' does not exist on type 'V'.
 node_modules/chrome-devtools-frontend/front_end/sources/JavaScriptBreakpointsSidebarPane.js(81,60): error TS2339: Property 'breakpoint' does not exist on type 'V'.
 node_modules/chrome-devtools-frontend/front_end/sources/JavaScriptBreakpointsSidebarPane.js(82,62): error TS2339: Property 'breakpoint' does not exist on type 'V'.
-node_modules/chrome-devtools-frontend/front_end/sources/JavaScriptBreakpointsSidebarPane.js(87,7): error TS2322: Type 'Node' is not assignable to type 'ChildNode'.
-node_modules/chrome-devtools-frontend/front_end/sources/JavaScriptBreakpointsSidebarPane.js(92,7): error TS2322: Type 'Node' is not assignable to type 'ChildNode'.
 node_modules/chrome-devtools-frontend/front_end/sources/JavaScriptBreakpointsSidebarPane.js(119,5): error TS2322: Type 'Promise<string>' is not assignable to type 'Promise<undefined>'.
+node_modules/chrome-devtools-frontend/front_end/sources/JavaScriptBreakpointsSidebarPane.js(131,38): error TS2554: Expected 0 arguments, but got 1.
 node_modules/chrome-devtools-frontend/front_end/sources/JavaScriptBreakpointsSidebarPane.js(141,29): error TS2339: Property 'enclosingNodeOrSelfWithClass' does not exist on type 'EventTarget'.
 node_modules/chrome-devtools-frontend/front_end/sources/JavaScriptBreakpointsSidebarPane.js(156,33): error TS2339: Property 'checkboxElement' does not exist on type 'EventTarget'.
 node_modules/chrome-devtools-frontend/front_end/sources/JavaScriptBreakpointsSidebarPane.js(159,11): error TS2339: Property 'consume' does not exist on type 'Event'.
@@ -11345,8 +11542,6 @@ node_modules/chrome-devtools-frontend/front_end/sources_test_runner/SourcesTestR
 node_modules/chrome-devtools-frontend/front_end/sources_test_runner/SourcesTestRunner.js(129,11): error TS2339: Property 'pushAll' does not exist on type 'any[]'.
 node_modules/chrome-devtools-frontend/front_end/terminal/TerminalWidget.js(29,54): error TS2339: Property 'createChild' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/terminal/TerminalWidget.js(30,65): error TS2555: Expected at least 2 arguments, but got 1.
-node_modules/chrome-devtools-frontend/front_end/terminal/TerminalWidget.js(139,9): error TS2322: Type 'Node' is not assignable to type 'ChildNode'.
-node_modules/chrome-devtools-frontend/front_end/terminal/TerminalWidget.js(146,7): error TS2322: Type 'Node' is not assignable to type 'ChildNode'.
 node_modules/chrome-devtools-frontend/front_end/terminal/xterm.js/addons/fit/fit.js(19,34): error TS2307: Cannot find module '../../xterm'.
 node_modules/chrome-devtools-frontend/front_end/terminal/xterm.js/addons/fit/fit.js(20,21): error TS2304: Cannot find name 'define'.
 node_modules/chrome-devtools-frontend/front_end/terminal/xterm.js/addons/fit/fit.js(24,5): error TS2304: Cannot find name 'define'.
@@ -11500,7 +11695,6 @@ node_modules/chrome-devtools-frontend/front_end/test_runner/TestRunner.js(683,28
 node_modules/chrome-devtools-frontend/front_end/test_runner/TestRunner.js(717,24): error TS2694: Namespace 'TestRunner' has no exported member 'CustomFormatters'.
 node_modules/chrome-devtools-frontend/front_end/test_runner/TestRunner.js(748,24): error TS2694: Namespace 'TestRunner' has no exported member 'CustomFormatters'.
 node_modules/chrome-devtools-frontend/front_end/test_runner/TestRunner.js(777,22): error TS2339: Property 'attributes' does not exist on type 'Node'.
-node_modules/chrome-devtools-frontend/front_end/test_runner/TestRunner.js(783,46): error TS2322: Type 'Node' is not assignable to type 'ChildNode'.
 node_modules/chrome-devtools-frontend/front_end/test_runner/TestRunner.js(785,14): error TS2339: Property 'shadowRoot' does not exist on type 'Node'.
 node_modules/chrome-devtools-frontend/front_end/test_runner/TestRunner.js(786,39): error TS2339: Property 'shadowRoot' does not exist on type 'Node'.
 node_modules/chrome-devtools-frontend/front_end/test_runner/TestRunner.js(805,12): error TS2339: Property 'shadowRoot' does not exist on type 'Node'.
@@ -11742,7 +11936,7 @@ node_modules/chrome-devtools-frontend/front_end/timeline/TimelineEventOverview.j
 node_modules/chrome-devtools-frontend/front_end/timeline/TimelineEventOverview.js(246,68): error TS2339: Property 'peekLast' does not exist on type 'any[]'.
 node_modules/chrome-devtools-frontend/front_end/timeline/TimelineEventOverview.js(248,81): error TS2339: Property '_overviewIndex' does not exist on type 'TimelineCategory'.
 node_modules/chrome-devtools-frontend/front_end/timeline/TimelineEventOverview.js(384,7): error TS2322: Type 'Promise<new (width?: number, height?: number) => HTMLImageElement>' is not assignable to type 'Promise<HTMLImageElement>'.
-  Type 'new (width?: number, height?: number) => HTMLImageElement' is missing the following properties from type 'HTMLImageElement': align, alt, border, complete, and 259 more.
+  Type 'new (width?: number, height?: number) => HTMLImageElement' is missing the following properties from type 'HTMLImageElement': align, alt, border, complete, and 261 more.
 node_modules/chrome-devtools-frontend/front_end/timeline/TimelineEventOverview.js(457,17): error TS2339: Property 'createChild' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/timeline/TimelineEventOverview.js(483,24): error TS2555: Expected at least 2 arguments, but got 1.
 node_modules/chrome-devtools-frontend/front_end/timeline/TimelineEventOverview.js(524,28): error TS2339: Property 'peekLast' does not exist on type 'TimelineFrame[]'.
@@ -12252,7 +12446,7 @@ node_modules/chrome-devtools-frontend/front_end/timeline/TimelineUIUtils.js(1652
 node_modules/chrome-devtools-frontend/front_end/timeline/TimelineUIUtils.js(1657,64): error TS2345: Argument of type 'new (width?: number, height?: number) => HTMLImageElement' is not assignable to parameter of type 'Node'.
 node_modules/chrome-devtools-frontend/front_end/timeline/TimelineUIUtils.js(1664,11): error TS2555: Expected at least 2 arguments, but got 1.
 node_modules/chrome-devtools-frontend/front_end/timeline/TimelineUIUtils.js(1665,67): error TS2555: Expected at least 2 arguments, but got 1.
-node_modules/chrome-devtools-frontend/front_end/timeline/TimelineUIUtils.js(1675,5): error TS2740: Type 'DocumentFragment' is missing the following properties from type 'Element': assignedSlot, attributes, classList, className, and 63 more.
+node_modules/chrome-devtools-frontend/front_end/timeline/TimelineUIUtils.js(1675,5): error TS2740: Type 'DocumentFragment' is missing the following properties from type 'Element': assignedSlot, attributes, classList, className, and 64 more.
 node_modules/chrome-devtools-frontend/front_end/timeline/TimelineUIUtils.js(1684,30): error TS2339: Property 'millisToString' does not exist on type 'NumberConstructor'.
 node_modules/chrome-devtools-frontend/front_end/timeline/TimelineUIUtils.js(1685,16): error TS2339: Property 'millisToString' does not exist on type 'NumberConstructor'.
 node_modules/chrome-devtools-frontend/front_end/timeline/TimelineUIUtils.js(1687,13): error TS2339: Property 'createTextChild' does not exist on type 'Element'.
@@ -13027,7 +13221,7 @@ node_modules/chrome-devtools-frontend/front_end/ui/TextPrompt.js(592,35): error
 node_modules/chrome-devtools-frontend/front_end/ui/TextPrompt.js(601,32): error TS2339: Property 'isAncestor' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/ui/TextPrompt.js(610,54): error TS2339: Property 'isAncestor' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/ui/TextPrompt.js(622,35): error TS2339: Property 'getComponentSelection' does not exist on type 'Element'.
-node_modules/chrome-devtools-frontend/front_end/ui/TextPrompt.js(627,7): error TS2740: Type 'ChildNode' is missing the following properties from type 'Element': assignedSlot, attributes, classList, className, and 67 more.
+node_modules/chrome-devtools-frontend/front_end/ui/TextPrompt.js(627,7): error TS2322: Type 'ChildNode' is not assignable to type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/ui/Toolbar.js(43,50): error TS2339: Property 'createChild' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/ui/Toolbar.js(48,45): error TS2339: Property 'createChild' does not exist on type 'DocumentFragment'.
 node_modules/chrome-devtools-frontend/front_end/ui/Toolbar.js(75,24): error TS2694: Namespace 'Common' has no exported member 'Event'.
@@ -13213,6 +13407,7 @@ node_modules/chrome-devtools-frontend/front_end/ui/UIUtils.js(1561,11): error TS
 node_modules/chrome-devtools-frontend/front_end/ui/UIUtils.js(1562,17): error TS2339: Property 'value' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/ui/UIUtils.js(1570,25): error TS2339: Property 'value' does not exist on type 'Element'.
 node_modules/chrome-devtools-frontend/front_end/ui/UIUtils.js(1574,11): error TS2339: Property 'value' does not exist on type 'Element'.
+node_modules/chrome-devtools-frontend/front_end/ui/UIUtils.js(1633,64): error TS2554: Expected 0 arguments, but got 1.
 node_modules/chrome-devtools-frontend/front_end/ui/UIUtils.js(1646,40): error TS2339: Property '_textWidthCache' does not exist on type '(context: CanvasRenderingContext2D, text: string) => number'.
 node_modules/chrome-devtools-frontend/front_end/ui/UIUtils.js(1649,25): error TS2339: Property '_textWidthCache' does not exist on type '(context: CanvasRenderingContext2D, text: string) => number'.
 node_modules/chrome-devtools-frontend/front_end/ui/UIUtils.js(1715,20): error TS2339: Property 'type' does not exist on type 'Element'.
diff --git a/tests/baselines/reference/user/npm.log b/tests/baselines/reference/user/npm.log
index 91a408b91d7..525a1007870 100644
--- a/tests/baselines/reference/user/npm.log
+++ b/tests/baselines/reference/user/npm.log
@@ -802,9 +802,9 @@ node_modules/npm/lib/utils/error-handler.js(146,27): error TS2339: Property 'con
 node_modules/npm/lib/utils/error-handler.js(166,14): error TS2339: Property 'code' does not exist on type 'Error'.
 node_modules/npm/lib/utils/error-handler.js(167,16): error TS2339: Property 'code' does not exist on type 'Error'.
 node_modules/npm/lib/utils/error-handler.js(168,8): error TS2339: Property 'code' does not exist on type 'Error'.
-node_modules/npm/lib/utils/error-handler.js(186,40): error TS2345: Argument of type '{ (value: any, replacer?: ((key: string, value: any) => any) | undefined, space?: string | number | undefined): string; (value: any, replacer?: (string | number)[] | null | undefined, space?: string | ... 1 more ... | undefined): string; }' is not assignable to parameter of type '(value: string, index: number, array: string[]) => string'.
+node_modules/npm/lib/utils/error-handler.js(186,40): error TS2345: Argument of type '{ (value: any, replacer?: ((this: any, key: string, value: any) => any) | undefined, space?: string | number | undefined): string; (value: any, replacer?: (string | number)[] | null | undefined, space?: string | ... 1 more ... | undefined): string; }' is not assignable to parameter of type '(value: string, index: number, array: string[]) => string'.
   Types of parameters 'replacer' and 'index' are incompatible.
-    Type 'number' is not assignable to type '((key: string, value: any) => any) | undefined'.
+    Type 'number' is not assignable to type '((this: any, key: string, value: any) => any) | undefined'.
 node_modules/npm/lib/utils/error-handler.js(188,33): error TS2339: Property 'version' does not exist on type 'typeof EventEmitter'.
 node_modules/npm/lib/utils/error-handler.js(205,11): error TS2339: Property 'config' does not exist on type 'typeof EventEmitter'.
 node_modules/npm/lib/utils/error-handler.js(208,18): error TS2339: Property 'code' does not exist on type 'Error'.
diff --git a/tests/cases/compiler/arrayFlatMap.ts b/tests/cases/compiler/arrayFlatMap.ts
index dc67bf02490..98f84e78773 100644
--- a/tests/cases/compiler/arrayFlatMap.ts
+++ b/tests/cases/compiler/arrayFlatMap.ts
@@ -1,4 +1,4 @@
-// @lib: esnext
+// @lib: es2019
 
 const array: number[] = [];
 const readonlyArray: ReadonlyArray<number> = [];
diff --git a/tests/cases/compiler/declarationEmitExpandoPropertyPrivateName.ts b/tests/cases/compiler/declarationEmitExpandoPropertyPrivateName.ts
new file mode 100644
index 00000000000..09be2a08ff8
--- /dev/null
+++ b/tests/cases/compiler/declarationEmitExpandoPropertyPrivateName.ts
@@ -0,0 +1,9 @@
+// @declaration: true
+// @filename: a.ts
+interface I {}
+export function f(): I { return null as I; }
+// @filename: b.ts
+import {f} from "./a";
+
+export function q() {}
+q.val = f();
diff --git a/tests/cases/compiler/jqueryInference.ts b/tests/cases/compiler/jqueryInference.ts
index 60165916257..5784638e453 100644
--- a/tests/cases/compiler/jqueryInference.ts
+++ b/tests/cases/compiler/jqueryInference.ts
@@ -10,4 +10,4 @@ declare function shouldBeIdentity<T, U>(p: DoNothingAlias<T, U>): MyPromise<T, U
 
 declare const p1: MyPromise<boolean, any>;
 var p2 = shouldBeIdentity(p1);
-var p2: MyPromise<boolean, {}>;
+var p2: MyPromise<boolean, any>;
diff --git a/tests/cases/compiler/stringTrim.ts b/tests/cases/compiler/stringTrim.ts
new file mode 100644
index 00000000000..d0329b87749
--- /dev/null
+++ b/tests/cases/compiler/stringTrim.ts
@@ -0,0 +1,7 @@
+// @target: es2019
+
+var trimmed: string;
+trimmed = "abcde".trimEnd();
+trimmed = "abcde".trimStart();
+trimmed = "abcde".trimLeft();
+trimmed = "abcde".trimRight();
diff --git a/tests/cases/conformance/emitter/esnext/noCatchBinding/emitter.noCatchBinding.esnext.ts b/tests/cases/conformance/emitter/es2019/noCatchBinding/emitter.noCatchBinding.es2019.ts
similarity index 85%
rename from tests/cases/conformance/emitter/esnext/noCatchBinding/emitter.noCatchBinding.esnext.ts
rename to tests/cases/conformance/emitter/es2019/noCatchBinding/emitter.noCatchBinding.es2019.ts
index 8e87b3c8c8f..d9dfb1bcd9a 100644
--- a/tests/cases/conformance/emitter/esnext/noCatchBinding/emitter.noCatchBinding.esnext.ts
+++ b/tests/cases/conformance/emitter/es2019/noCatchBinding/emitter.noCatchBinding.es2019.ts
@@ -1,8 +1,8 @@
-// @target: esnext
+// @target: es2019
 function f() {
     try { } catch { }
     try { } catch { 
         try { } catch { }
     }
     try { } catch { } finally { }
-}
\ No newline at end of file
+}
diff --git a/tests/cases/conformance/types/conditional/conditionalTypes2.ts b/tests/cases/conformance/types/conditional/conditionalTypes2.ts
index 4b65b5ddeb2..5d73c58fe7f 100644
--- a/tests/cases/conformance/types/conditional/conditionalTypes2.ts
+++ b/tests/cases/conformance/types/conditional/conditionalTypes2.ts
@@ -1,6 +1,8 @@
 // @strict: true
 // @declaration: true
 
+// #27118: Conditional types are now invariant in the check type.
+
 interface Covariant<T> {
     foo: T extends string ? T : number;
 }
@@ -14,13 +16,13 @@ interface Invariant<T> {
 }
 
 function f1<A, B extends A>(a: Covariant<A>, b: Covariant<B>) {
-    a = b;
+    a = b;  // Error
     b = a;  // Error
 }
 
 function f2<A, B extends A>(a: Contravariant<A>, b: Contravariant<B>) {
     a = b;  // Error
-    b = a;
+    b = a;  // Error
 }
 
 function f3<A, B extends A>(a: Invariant<A>, b: Invariant<B>) {
@@ -78,38 +80,6 @@ function f21<T>(x: Extract<Extract<T, Foo>, Bar>, y: Extract<T, Foo & Bar>, z: E
     fooBat(z);  // Error
 }
 
-// Repros from #22860
-
-class Opt<T> {
-    toVector(): Vector<T> {
-        return <any>undefined;
-    }
-}
-
-interface Seq<T> {
-    tail(): Opt<Seq<T>>;
-}
-
-class Vector<T> implements Seq<T> {
-    tail(): Opt<Vector<T>> {
-        return <any>undefined;
-    }
-    partition2<U extends T>(predicate:(v:T)=>v is U): [Vector<U>,Vector<Exclude<T, U>>];
-    partition2(predicate:(x:T)=>boolean): [Vector<T>,Vector<T>];
-    partition2<U extends T>(predicate:(v:T)=>boolean): [Vector<U>,Vector<any>] {
-        return <any>undefined;
-    }
-}
-
-interface A1<T> {
-    bat: B1<A1<T>>;
-}
-
-interface B1<T> extends A1<T> {
-    bat: B1<B1<T>>;
-    boom: T extends any ? true : true
-}
-
 // Repro from #22899
 
 declare function toString1(value: object | Function): string ;
@@ -190,3 +160,22 @@ type ProductComplementComplement = {
 };
 type PCCA = ProductComplementComplement['a'];
 type PCCB = ProductComplementComplement['b'];
+
+// Repros from #27118
+
+type MyElement<A> = [A] extends [[infer E]] ? E : never;
+function oops<A, B extends A>(arg: MyElement<A>): MyElement<B> {
+    return arg;  // Unsound, should be error
+}
+
+type MyAcceptor<A> = [A] extends [[infer E]] ? (arg: E) => void : never;
+function oops2<A, B extends A>(arg: MyAcceptor<B>): MyAcceptor<A> {
+    return arg;  // Unsound, should be error
+}
+
+type Dist<T> = T extends number ? number : string;
+type Aux<A extends { a: unknown }> = A["a"] extends number ? number : string;
+type Nondist<T> = Aux<{a: T}>;
+function oops3<T>(arg: Dist<T>): Nondist<T> {
+    return arg;  // Unsound, should be error
+}
diff --git a/tests/cases/conformance/types/mapped/isomorphicMappedTypeInference.ts b/tests/cases/conformance/types/mapped/isomorphicMappedTypeInference.ts
index 14bb765a840..031cf840d33 100644
--- a/tests/cases/conformance/types/mapped/isomorphicMappedTypeInference.ts
+++ b/tests/cases/conformance/types/mapped/isomorphicMappedTypeInference.ts
@@ -152,4 +152,31 @@ var g2 = applySpec({ foo: { bar: { baz: (x: any) => true } } });
 const foo = <T>(object: T, partial: Partial<T>) => object;
 let o = {a: 5, b: 7};
 foo(o, {b: 9});
-o = foo(o, {b: 9});
\ No newline at end of file
+o = foo(o, {b: 9});
+
+// Inferring to { [P in K]: X }, where K extends keyof T, produces same inferences as
+// inferring to { [P in keyof T]: X }.
+
+declare function f20<T, K extends keyof T>(obj: Pick<T, K>): T;
+declare function f21<T, K extends keyof T>(obj: Pick<T, K>): K;
+declare function f22<T, K extends keyof T>(obj: Boxified<Pick<T, K>>): T;
+declare function f23<T, U extends keyof T, K extends U>(obj: Pick<T, K>): T;
+declare function f24<T, U, K extends keyof T | keyof U>(obj: Pick<T & U, K>): T & U;
+
+let x0 = f20({ foo: 42, bar: "hello" });
+let x1 = f21({ foo: 42, bar: "hello" });
+let x2 = f22({ foo: { value: 42} , bar: { value: "hello" } });
+let x3 = f23({ foo: 42, bar: "hello" });
+let x4 = f24({ foo: 42, bar: "hello" });
+
+// Repro from #29765
+
+function getProps<T, K extends keyof T>(obj: T, list: K[]): Pick<T, K> {
+    return {} as any;
+}
+
+const myAny: any = {};
+
+const o1 = getProps(myAny, ['foo', 'bar']);
+
+const o2: { foo: any; bar: any } = getProps(myAny, ['foo', 'bar']);
diff --git a/tests/cases/conformance/types/rest/restTuplesFromContextualTypes.ts b/tests/cases/conformance/types/rest/restTuplesFromContextualTypes.ts
index 84bf81195b0..d5623a000a2 100644
--- a/tests/cases/conformance/types/rest/restTuplesFromContextualTypes.ts
+++ b/tests/cases/conformance/types/rest/restTuplesFromContextualTypes.ts
@@ -70,3 +70,17 @@ declare function take(cb: (a: number, b: string) => void): void;
 
 (function foo(...rest){}(1, ''));
 take(function(...rest){});
+
+// Repro from #29833
+
+type ArgsUnion = [number, string] | [number, Error];
+type TupleUnionFunc = (...params: ArgsUnion) => number;
+
+const funcUnionTupleNoRest: TupleUnionFunc = (num, strOrErr) => {
+  return num;
+};
+
+const funcUnionTupleRest: TupleUnionFunc = (...params) => {
+  const [num, strOrErr] = params;
+  return num;
+};
diff --git a/tests/cases/conformance/types/typeRelationships/typeInference/unionAndIntersectionInference1.ts b/tests/cases/conformance/types/typeRelationships/typeInference/unionAndIntersectionInference1.ts
index 7066c3e6790..d4c7d25615e 100644
--- a/tests/cases/conformance/types/typeRelationships/typeInference/unionAndIntersectionInference1.ts
+++ b/tests/cases/conformance/types/typeRelationships/typeInference/unionAndIntersectionInference1.ts
@@ -1,3 +1,5 @@
+// @target: es2015
+
 // Repro from #2264
 
 interface Y { 'i am a very certain type': Y }
@@ -70,3 +72,21 @@ declare var mbp: Man & Bear;
 
 pigify(mbp).oinks; // OK, mbp is treated as Pig
 pigify(mbp).walks; // Ok, mbp is treated as Man
+
+// Repros from #29815
+
+interface ITest {
+  name: 'test'
+}
+
+const createTestAsync = (): Promise<ITest> => Promise.resolve().then(() => ({ name: 'test' }))
+
+const createTest = (): ITest => {
+  return { name: 'test' }
+}
+
+declare function f1<T, U>(x: T | U): T | U;
+declare function f2<T, U>(x: T & U): T & U;
+
+let x1: string = f1('a');
+let x2: string = f2('a');
diff --git a/tslint.json b/tslint.json
index a3ca10e75ed..5952c770c5e 100644
--- a/tslint.json
+++ b/tslint.json
@@ -5,6 +5,11 @@
         "no-unnecessary-type-assertion": true,
 
         "array-type": [true, "array"],
+        "ban": [
+            true,
+            "setInterval",
+            "setTimeout"
+        ],
         "ban-types": {
             "options": [
                 ["Object", "Avoid using the `Object` type. Did you mean `object`?"],
@@ -34,6 +39,7 @@
         ],
         "no-bom": true,
         "no-double-space": true,
+        "no-eval": true,
         "no-in-operator": true,
         "no-increment-decrement": true,
         "no-inferrable-types": true,
@@ -100,7 +106,6 @@
         "no-console": false,
         "no-debugger": false,
         "no-empty-interface": false,
-        "no-eval": false,
         "no-object-literal-type-assertion": false,
         "no-shadowed-variable": false,
         "no-submodule-imports": false,