diff --git a/Jakefile.js b/Jakefile.js
index 5779d75022f..ea8dc5e0328 100644
--- a/Jakefile.js
+++ b/Jakefile.js
@@ -11,11 +11,7 @@ var ts = require("./lib/typescript");
 
 // Variables
 var compilerDirectory = "src/compiler/";
-var servicesDirectory = "src/services/";
 var serverDirectory = "src/server/";
-var typingsInstallerDirectory = "src/server/typingsInstaller";
-var cancellationTokenDirectory = "src/server/cancellationToken";
-var watchGuardDirectory = "src/server/watchGuard";
 var harnessDirectory = "src/harness/";
 var libraryDirectory = "src/lib/";
 var scriptsDirectory = "scripts/";
@@ -131,6 +127,7 @@ var harnessSources = harnessCoreSources.concat([
     "matchFiles.ts",
     "initializeTSConfig.ts",
     "printer.ts",
+    "textChanges.ts",
     "transform.ts",
     "customTransforms.ts",
 ].map(function (f) {
diff --git a/README.md b/README.md
index 2f631439eb0..d21e558360c 100644
--- a/README.md
+++ b/README.md
@@ -39,8 +39,8 @@ with any additional questions or comments.
 
 ## Documentation
 
-*  [Quick tutorial](http://www.typescriptlang.org/Tutorial)
-*  [Programming handbook](http://www.typescriptlang.org/Handbook)
+*  [Quick tutorial](http://www.typescriptlang.org/docs/tutorial.html)
+*  [Programming handbook](http://www.typescriptlang.org/docs/handbook/basic-types.html)
 *  [Language specification](https://github.com/Microsoft/TypeScript/blob/master/doc/spec.md)
 *  [Homepage](http://www.typescriptlang.org/)
 
@@ -95,4 +95,4 @@ node built/local/tsc.js hello.ts
 
 ## Roadmap
 
-For details on our planned features and future direction please refer to our [roadmap](https://github.com/Microsoft/TypeScript/wiki/Roadmap).
\ No newline at end of file
+For details on our planned features and future direction please refer to our [roadmap](https://github.com/Microsoft/TypeScript/wiki/Roadmap).
diff --git a/issue_template.md b/issue_template.md
index 4d397a0afd6..29190e79763 100644
--- a/issue_template.md
+++ b/issue_template.md
@@ -2,7 +2,7 @@
 <!-- QUESTIONS: This is not a general support forum! Ask Qs at http://stackoverflow.com/questions/tagged/typescript -->
 <!-- SUGGESTIONS: See https://github.com/Microsoft/TypeScript-wiki/blob/master/Writing-Good-Design-Proposals.md -->
 
-**TypeScript Version:**  2.1.1 / nightly (2.2.0-dev.201xxxxx)
+**TypeScript Version:**  2.2.1 / nightly (2.2.0-dev.201xxxxx)
 
 **Code**
 
diff --git a/src/compiler/binder.ts b/src/compiler/binder.ts
index 418905e604c..650797c6dba 100644
--- a/src/compiler/binder.ts
+++ b/src/compiler/binder.ts
@@ -2332,6 +2332,7 @@ namespace ts {
 
         function bindThisPropertyAssignment(node: BinaryExpression) {
             Debug.assert(isInJavaScriptFile(node));
+            const container = getThisContainer(node, /*includeArrowFunctions*/false);
             switch (container.kind) {
                 case SyntaxKind.FunctionDeclaration:
                 case SyntaxKind.FunctionExpression:
@@ -2342,6 +2343,7 @@ namespace ts {
                     break;
 
                 case SyntaxKind.Constructor:
+                case SyntaxKind.PropertyDeclaration:
                 case SyntaxKind.MethodDeclaration:
                 case SyntaxKind.GetAccessor:
                 case SyntaxKind.SetAccessor:
diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index f36f471ee75..00498191f28 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -3973,7 +3973,7 @@ namespace ts {
                 return true;
             }
             if (type.flags & TypeFlags.TypeVariable) {
-                const constraint = getBaseConstraintOfType(<TypeVariable>type);
+                const constraint = getBaseConstraintOfType(type);
                 return constraint && isValidBaseType(constraint) && isMixinConstructorType(constraint);
             }
             return false;
@@ -4989,16 +4989,32 @@ namespace ts {
         }
 
         function getConstraintOfType(type: TypeVariable | UnionOrIntersectionType): Type {
-            return type.flags & TypeFlags.TypeParameter ? getConstraintOfTypeParameter(<TypeParameter>type) : getBaseConstraintOfType(type);
+            return type.flags & TypeFlags.TypeParameter ? getConstraintOfTypeParameter(<TypeParameter>type) :
+                type.flags & TypeFlags.IndexedAccess ? getConstraintOfIndexedAccess(<IndexedAccessType>type) :
+                getBaseConstraintOfType(type);
         }
 
         function getConstraintOfTypeParameter(typeParameter: TypeParameter): Type {
             return hasNonCircularBaseConstraint(typeParameter) ? getConstraintFromTypeParameter(typeParameter) : undefined;
         }
 
-        function getBaseConstraintOfType(type: TypeVariable | UnionOrIntersectionType): Type {
-            const constraint = getResolvedBaseConstraint(type);
-            return constraint !== noConstraintType && constraint !== circularConstraintType ? constraint : undefined;
+        function getConstraintOfIndexedAccess(type: IndexedAccessType) {
+            const baseObjectType = getBaseConstraintOfType(type.objectType);
+            const baseIndexType = getBaseConstraintOfType(type.indexType);
+            return baseObjectType || baseIndexType ? getIndexedAccessType(baseObjectType || type.objectType, baseIndexType || type.indexType) : undefined;
+        }
+
+        function getBaseConstraintOfType(type: Type): Type {
+            if (type.flags & (TypeFlags.TypeVariable | TypeFlags.UnionOrIntersection)) {
+                const constraint = getResolvedBaseConstraint(<TypeVariable | UnionOrIntersectionType>type);
+                if (constraint !== noConstraintType && constraint !== circularConstraintType) {
+                    return constraint;
+                }
+            }
+            else if (type.flags & TypeFlags.Index) {
+                return stringType;
+            }
+            return undefined;
         }
 
         function hasNonCircularBaseConstraint(type: TypeVariable): boolean {
@@ -5096,7 +5112,7 @@ namespace ts {
          * type itself. Note that the apparent type of a union type is the union type itself.
          */
         function getApparentType(type: Type): Type {
-            const t = type.flags & TypeFlags.TypeVariable ? getBaseConstraintOfType(<TypeVariable>type) || emptyObjectType : type;
+            const t = type.flags & TypeFlags.TypeVariable ? getBaseConstraintOfType(type) || emptyObjectType : type;
             return t.flags & TypeFlags.Intersection ? getApparentTypeOfIntersectionType(<IntersectionType>t) :
                 t.flags & TypeFlags.StringLike ? globalStringType :
                 t.flags & TypeFlags.NumberLike ? globalNumberType :
@@ -7921,7 +7937,7 @@ namespace ts {
                     }
                     // A type S is related to a type T[K] if S is related to A[K], where K is string-like and
                     // A is the apparent type of S.
-                    const constraint = getBaseConstraintOfType(<IndexedAccessType>target);
+                    const constraint = getBaseConstraintOfType(target);
                     if (constraint) {
                         if (result = isRelatedTo(source, constraint, reportErrors)) {
                             errorInfo = saveErrorInfo;
@@ -7961,7 +7977,7 @@ namespace ts {
                 else if (source.flags & TypeFlags.IndexedAccess) {
                     // A type S[K] is related to a type T if A[K] is related to T, where K is string-like and
                     // A is the apparent type of S.
-                    const constraint = getBaseConstraintOfType(<IndexedAccessType>source);
+                    const constraint = getConstraintOfType(<IndexedAccessType>source);
                     if (constraint) {
                         if (result = isRelatedTo(constraint, target, reportErrors)) {
                             errorInfo = saveErrorInfo;
@@ -9874,7 +9890,7 @@ namespace ts {
                 return strictNullChecks ? TypeFacts.ObjectStrictFacts : TypeFacts.ObjectFacts;
             }
             if (flags & TypeFlags.TypeVariable) {
-                return getTypeFacts(getBaseConstraintOfType(<TypeVariable>type) || emptyObjectType);
+                return getTypeFacts(getBaseConstraintOfType(type) || emptyObjectType);
             }
             if (flags & TypeFlags.UnionOrIntersection) {
                 return getTypeFactsOfTypes((<UnionOrIntersectionType>type).types);
@@ -10686,7 +10702,7 @@ namespace ts {
                             return targetType;
                         }
                         if (type.flags & TypeFlags.TypeVariable) {
-                            const constraint = getBaseConstraintOfType(<TypeVariable>type) || anyType;
+                            const constraint = getBaseConstraintOfType(type) || anyType;
                             if (isTypeSubtypeOf(targetType, constraint)) {
                                 return getIntersectionType([type, targetType]);
                             }
@@ -16234,7 +16250,7 @@ namespace ts {
         function isLiteralContextualType(contextualType: Type) {
             if (contextualType) {
                 if (contextualType.flags & TypeFlags.TypeVariable) {
-                    const constraint = getBaseConstraintOfType(<TypeVariable>contextualType) || emptyObjectType;
+                    const constraint = getBaseConstraintOfType(contextualType) || emptyObjectType;
                     // If the type parameter is constrained to the base primitive type we're checking for,
                     // consider this a literal context. For example, given a type parameter 'T extends string',
                     // this causes us to infer string literal types for T.
@@ -17124,7 +17140,7 @@ namespace ts {
             // Check if we're indexing with a numeric type and the object type is a generic
             // type with a constraint that has a numeric index signature.
             if (maybeTypeOfKind(objectType, TypeFlags.TypeVariable) && isTypeOfKind(indexType, TypeFlags.NumberLike)) {
-                const constraint = getBaseConstraintOfType(<TypeVariable | UnionOrIntersectionType>objectType);
+                const constraint = getBaseConstraintOfType(objectType);
                 if (constraint && getIndexInfoOfType(constraint, IndexKind.Number)) {
                     return type;
                 }
diff --git a/src/compiler/emitter.ts b/src/compiler/emitter.ts
index b10f2e7cb17..616be35270e 100644
--- a/src/compiler/emitter.ts
+++ b/src/compiler/emitter.ts
@@ -199,6 +199,8 @@ namespace ts {
             onEmitHelpers,
             onSetSourceFile,
             substituteNode,
+            onBeforeEmitNodeArray,
+            onAfterEmitNodeArray
         } = handlers;
 
         const newLine = getNewLineCharacter(printerOptions);
@@ -631,6 +633,11 @@ namespace ts {
             if (isExpression(node)) {
                 return pipelineEmitExpression(trySubstituteNode(EmitHint.Expression, node));
             }
+
+            if (isToken(node)) {
+                writeTokenText(kind);
+                return;
+            }
         }
 
         function pipelineEmitExpression(node: Node): void {
@@ -1553,6 +1560,10 @@ namespace ts {
             emitSignatureAndBody(node, emitSignatureHead);
         }
 
+        function emitBlockCallback(_hint: EmitHint, body: Node): void {
+            emitBlockFunctionBody(<Block>body);
+        }
+
         function emitSignatureAndBody(node: FunctionLikeDeclaration, emitSignatureHead: (node: SignatureDeclaration) => void) {
             const body = node.body;
             if (body) {
@@ -1564,12 +1575,22 @@ namespace ts {
 
                     if (getEmitFlags(node) & EmitFlags.ReuseTempVariableScope) {
                         emitSignatureHead(node);
-                        emitBlockFunctionBody(body);
+                        if (onEmitNode) {
+                            onEmitNode(EmitHint.Unspecified, body, emitBlockCallback);
+                        }
+                        else {
+                            emitBlockFunctionBody(body);
+                        }
                     }
                     else {
                         pushNameGenerationScope();
                         emitSignatureHead(node);
-                        emitBlockFunctionBody(body);
+                        if (onEmitNode) {
+                            onEmitNode(EmitHint.Unspecified, body, emitBlockCallback);
+                        }
+                        else {
+                            emitBlockFunctionBody(body);
+                        }
                         popNameGenerationScope();
                     }
 
@@ -2200,6 +2221,10 @@ namespace ts {
                 write(getOpeningBracket(format));
             }
 
+            if (onBeforeEmitNodeArray) {
+                onBeforeEmitNodeArray(children);
+            }
+
             if (isEmpty) {
                 // Write a line terminator if the parent node was multi-line
                 if (format & ListFormat.MultiLine) {
@@ -2315,6 +2340,10 @@ namespace ts {
                 }
             }
 
+            if (onAfterEmitNodeArray) {
+                onAfterEmitNodeArray(children);
+            }
+
             if (format & ListFormat.BracketsMask) {
                 write(getClosingBracket(format));
             }
diff --git a/src/compiler/factory.ts b/src/compiler/factory.ts
index 3ff3bc2782f..669c66c4337 100644
--- a/src/compiler/factory.ts
+++ b/src/compiler/factory.ts
@@ -1099,6 +1099,10 @@ namespace ts {
             : node;
     }
 
+    export function createKeywordTypeNode(kind: KeywordTypeNode["kind"]): KeywordTypeNode {
+        return <KeywordTypeNode>createSynthesizedNode(kind);
+    }
+
     export function createFunctionDeclaration(decorators: Decorator[] | undefined, modifiers: Modifier[] | undefined, asteriskToken: AsteriskToken | undefined, name: string | Identifier | undefined, typeParameters: TypeParameterDeclaration[] | undefined, parameters: ParameterDeclaration[], type: TypeNode | undefined, body: Block | undefined) {
         const node = <FunctionDeclaration>createSynthesizedNode(SyntaxKind.FunctionDeclaration);
         node.decorators = asNodeArray(decorators);
diff --git a/src/compiler/scanner.ts b/src/compiler/scanner.ts
index fb91b0ff5b7..b7a3f35d728 100644
--- a/src/compiler/scanner.ts
+++ b/src/compiler/scanner.ts
@@ -333,7 +333,7 @@ namespace ts {
     }
 
     /* @internal */
-    export function getLineStarts(sourceFile: SourceFile): number[] {
+    export function getLineStarts(sourceFile: SourceFileLike): number[] {
         return sourceFile.lineMap || (sourceFile.lineMap = computeLineStarts(sourceFile.text));
     }
 
diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index 2d9bd9c8033..63753a31923 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -2209,6 +2209,16 @@ namespace ts {
         name: string;
     }
 
+    /* @internal */
+    /**
+     * Subset of properties from SourceFile that are used in multiple utility functions
+     */
+    export interface SourceFileLike {
+        readonly text: string;
+        lineMap: number[];
+    }
+
+
     // Source files are declarations when they are external modules.
     export interface SourceFile extends Declaration {
         kind: SyntaxKind.SourceFile;
@@ -4138,6 +4148,8 @@ namespace ts {
         /*@internal*/ onEmitSourceMapOfPosition?: (pos: number) => void;
         /*@internal*/ onEmitHelpers?: (node: Node, writeLines: (text: string) => void) => void;
         /*@internal*/ onSetSourceFile?: (node: SourceFile) => void;
+        /*@internal*/ onBeforeEmitNodeArray?: (nodes: NodeArray<any>) => void;
+        /*@internal*/ onAfterEmitNodeArray?: (nodes: NodeArray<any>) => void;
     }
 
     export interface PrinterOptions {
diff --git a/src/compiler/utilities.ts b/src/compiler/utilities.ts
index a5229b614be..030b66813a5 100644
--- a/src/compiler/utilities.ts
+++ b/src/compiler/utilities.ts
@@ -184,7 +184,7 @@ namespace ts {
         return false;
     }
 
-    export function getStartPositionOfLine(line: number, sourceFile: SourceFile): number {
+    export function getStartPositionOfLine(line: number, sourceFile: SourceFileLike): number {
         Debug.assert(line >= 0);
         return getLineStarts(sourceFile)[line];
     }
@@ -204,7 +204,7 @@ namespace ts {
         return value !== undefined;
     }
 
-    export function getEndLinePosition(line: number, sourceFile: SourceFile): number {
+    export function getEndLinePosition(line: number, sourceFile: SourceFileLike): number {
         Debug.assert(line >= 0);
         const lineStarts = getLineStarts(sourceFile);
 
@@ -255,7 +255,11 @@ namespace ts {
         return !nodeIsMissing(node);
     }
 
-    export function getTokenPosOfNode(node: Node, sourceFile?: SourceFile, includeJsDoc?: boolean): number {
+    export function isToken(n: Node): boolean {
+        return n.kind >= SyntaxKind.FirstToken && n.kind <= SyntaxKind.LastToken;
+    }
+
+    export function getTokenPosOfNode(node: Node, sourceFile?: SourceFileLike, includeJsDoc?: boolean): number {
         // With nodes that have no width (i.e. 'Missing' nodes), we actually *don't*
         // want to skip trivia because this will launch us forward to the next token.
         if (nodeIsMissing(node)) {
@@ -289,7 +293,7 @@ namespace ts {
         return node.kind >= SyntaxKind.FirstJSDocTagNode && node.kind <= SyntaxKind.LastJSDocTagNode;
     }
 
-    export function getNonDecoratorTokenPosOfNode(node: Node, sourceFile?: SourceFile): number {
+    export function getNonDecoratorTokenPosOfNode(node: Node, sourceFile?: SourceFileLike): number {
         if (nodeIsMissing(node) || !node.decorators) {
             return getTokenPosOfNode(node, sourceFile);
         }
@@ -2491,7 +2495,7 @@ namespace ts {
         return indentStrings[1].length;
     }
 
-    export function createTextWriter(newLine: String): EmitTextWriter {
+    export function createTextWriter(newLine: string): EmitTextWriter {
         let output: string;
         let indent: number;
         let lineStart: boolean;
diff --git a/src/compiler/visitor.ts b/src/compiler/visitor.ts
index 0f4a4ed6561..133c62e1926 100644
--- a/src/compiler/visitor.ts
+++ b/src/compiler/visitor.ts
@@ -154,9 +154,9 @@ namespace ts {
      * Starts a new lexical environment and visits a parameter list, suspending the lexical
      * environment upon completion.
      */
-    export function visitParameterList(nodes: NodeArray<ParameterDeclaration>, visitor: Visitor, context: TransformationContext) {
+    export function visitParameterList(nodes: NodeArray<ParameterDeclaration>, visitor: Visitor, context: TransformationContext, nodesVisitor = visitNodes) {
         context.startLexicalEnvironment();
-        const updated = visitNodes(nodes, visitor, isParameterDeclaration);
+        const updated = nodesVisitor(nodes, visitor, isParameterDeclaration);
         context.suspendLexicalEnvironment();
         return updated;
     }
@@ -204,9 +204,9 @@ namespace ts {
      * @param visitor The callback used to visit each child.
      * @param context A lexical environment context for the visitor.
      */
-    export function visitEachChild<T extends Node>(node: T | undefined, visitor: Visitor, context: TransformationContext): T | undefined;
+    export function visitEachChild<T extends Node>(node: T | undefined, visitor: Visitor, context: TransformationContext, nodesVisitor?: typeof visitNodes): T | undefined;
 
-    export function visitEachChild(node: Node, visitor: Visitor, context: TransformationContext): Node {
+    export function visitEachChild(node: Node, visitor: Visitor, context: TransformationContext, nodesVisitor = visitNodes): Node {
         if (node === undefined) {
             return undefined;
         }
@@ -243,8 +243,8 @@ namespace ts {
             // Signature elements
             case SyntaxKind.Parameter:
                 return updateParameter(<ParameterDeclaration>node,
-                    visitNodes((<ParameterDeclaration>node).decorators, visitor, isDecorator),
-                    visitNodes((<ParameterDeclaration>node).modifiers, visitor, isModifier),
+                    nodesVisitor((<ParameterDeclaration>node).decorators, visitor, isDecorator),
+                    nodesVisitor((<ParameterDeclaration>node).modifiers, visitor, isModifier),
                     (<ParameterDeclaration>node).dotDotDotToken,
                     visitNode((<ParameterDeclaration>node).name, visitor, isBindingName),
                     visitNode((<ParameterDeclaration>node).type, visitor, isTypeNode),
@@ -257,55 +257,55 @@ namespace ts {
             // Type member
             case SyntaxKind.PropertyDeclaration:
                 return updateProperty(<PropertyDeclaration>node,
-                    visitNodes((<PropertyDeclaration>node).decorators, visitor, isDecorator),
-                    visitNodes((<PropertyDeclaration>node).modifiers, visitor, isModifier),
+                    nodesVisitor((<PropertyDeclaration>node).decorators, visitor, isDecorator),
+                    nodesVisitor((<PropertyDeclaration>node).modifiers, visitor, isModifier),
                     visitNode((<PropertyDeclaration>node).name, visitor, isPropertyName),
                     visitNode((<PropertyDeclaration>node).type, visitor, isTypeNode),
                     visitNode((<PropertyDeclaration>node).initializer, visitor, isExpression));
 
             case SyntaxKind.MethodDeclaration:
                 return updateMethod(<MethodDeclaration>node,
-                    visitNodes((<MethodDeclaration>node).decorators, visitor, isDecorator),
-                    visitNodes((<MethodDeclaration>node).modifiers, visitor, isModifier),
+                    nodesVisitor((<MethodDeclaration>node).decorators, visitor, isDecorator),
+                    nodesVisitor((<MethodDeclaration>node).modifiers, visitor, isModifier),
                     (<MethodDeclaration>node).asteriskToken,
                     visitNode((<MethodDeclaration>node).name, visitor, isPropertyName),
-                    visitNodes((<MethodDeclaration>node).typeParameters, visitor, isTypeParameter),
-                    visitParameterList((<MethodDeclaration>node).parameters, visitor, context),
+                    nodesVisitor((<MethodDeclaration>node).typeParameters, visitor, isTypeParameter),
+                    visitParameterList((<MethodDeclaration>node).parameters, visitor, context, nodesVisitor),
                     visitNode((<MethodDeclaration>node).type, visitor, isTypeNode),
                     visitFunctionBody((<MethodDeclaration>node).body, visitor, context));
 
             case SyntaxKind.Constructor:
                 return updateConstructor(<ConstructorDeclaration>node,
-                    visitNodes((<ConstructorDeclaration>node).decorators, visitor, isDecorator),
-                    visitNodes((<ConstructorDeclaration>node).modifiers, visitor, isModifier),
-                    visitParameterList((<ConstructorDeclaration>node).parameters, visitor, context),
+                    nodesVisitor((<ConstructorDeclaration>node).decorators, visitor, isDecorator),
+                    nodesVisitor((<ConstructorDeclaration>node).modifiers, visitor, isModifier),
+                    visitParameterList((<ConstructorDeclaration>node).parameters, visitor, context, nodesVisitor),
                     visitFunctionBody((<ConstructorDeclaration>node).body, visitor, context));
 
             case SyntaxKind.GetAccessor:
                 return updateGetAccessor(<GetAccessorDeclaration>node,
-                    visitNodes((<GetAccessorDeclaration>node).decorators, visitor, isDecorator),
-                    visitNodes((<GetAccessorDeclaration>node).modifiers, visitor, isModifier),
+                    nodesVisitor((<GetAccessorDeclaration>node).decorators, visitor, isDecorator),
+                    nodesVisitor((<GetAccessorDeclaration>node).modifiers, visitor, isModifier),
                     visitNode((<GetAccessorDeclaration>node).name, visitor, isPropertyName),
-                    visitParameterList((<GetAccessorDeclaration>node).parameters, visitor, context),
+                    visitParameterList((<GetAccessorDeclaration>node).parameters, visitor, context, nodesVisitor),
                     visitNode((<GetAccessorDeclaration>node).type, visitor, isTypeNode),
                     visitFunctionBody((<GetAccessorDeclaration>node).body, visitor, context));
 
             case SyntaxKind.SetAccessor:
                 return updateSetAccessor(<SetAccessorDeclaration>node,
-                    visitNodes((<SetAccessorDeclaration>node).decorators, visitor, isDecorator),
-                    visitNodes((<SetAccessorDeclaration>node).modifiers, visitor, isModifier),
+                    nodesVisitor((<SetAccessorDeclaration>node).decorators, visitor, isDecorator),
+                    nodesVisitor((<SetAccessorDeclaration>node).modifiers, visitor, isModifier),
                     visitNode((<SetAccessorDeclaration>node).name, visitor, isPropertyName),
-                    visitParameterList((<SetAccessorDeclaration>node).parameters, visitor, context),
+                    visitParameterList((<SetAccessorDeclaration>node).parameters, visitor, context, nodesVisitor),
                     visitFunctionBody((<SetAccessorDeclaration>node).body, visitor, context));
 
             // Binding patterns
             case SyntaxKind.ObjectBindingPattern:
                 return updateObjectBindingPattern(<ObjectBindingPattern>node,
-                    visitNodes((<ObjectBindingPattern>node).elements, visitor, isBindingElement));
+                    nodesVisitor((<ObjectBindingPattern>node).elements, visitor, isBindingElement));
 
             case SyntaxKind.ArrayBindingPattern:
                 return updateArrayBindingPattern(<ArrayBindingPattern>node,
-                    visitNodes((<ArrayBindingPattern>node).elements, visitor, isArrayBindingElement));
+                    nodesVisitor((<ArrayBindingPattern>node).elements, visitor, isArrayBindingElement));
 
             case SyntaxKind.BindingElement:
                 return updateBindingElement(<BindingElement>node,
@@ -317,11 +317,11 @@ namespace ts {
             // Expression
             case SyntaxKind.ArrayLiteralExpression:
                 return updateArrayLiteral(<ArrayLiteralExpression>node,
-                    visitNodes((<ArrayLiteralExpression>node).elements, visitor, isExpression));
+                    nodesVisitor((<ArrayLiteralExpression>node).elements, visitor, isExpression));
 
             case SyntaxKind.ObjectLiteralExpression:
                 return updateObjectLiteral(<ObjectLiteralExpression>node,
-                    visitNodes((<ObjectLiteralExpression>node).properties, visitor, isObjectLiteralElementLike));
+                    nodesVisitor((<ObjectLiteralExpression>node).properties, visitor, isObjectLiteralElementLike));
 
             case SyntaxKind.PropertyAccessExpression:
                 return updatePropertyAccess(<PropertyAccessExpression>node,
@@ -336,14 +336,14 @@ namespace ts {
             case SyntaxKind.CallExpression:
                 return updateCall(<CallExpression>node,
                     visitNode((<CallExpression>node).expression, visitor, isExpression),
-                    visitNodes((<CallExpression>node).typeArguments, visitor, isTypeNode),
-                    visitNodes((<CallExpression>node).arguments, visitor, isExpression));
+                    nodesVisitor((<CallExpression>node).typeArguments, visitor, isTypeNode),
+                    nodesVisitor((<CallExpression>node).arguments, visitor, isExpression));
 
             case SyntaxKind.NewExpression:
                 return updateNew(<NewExpression>node,
                     visitNode((<NewExpression>node).expression, visitor, isExpression),
-                    visitNodes((<NewExpression>node).typeArguments, visitor, isTypeNode),
-                    visitNodes((<NewExpression>node).arguments, visitor, isExpression));
+                    nodesVisitor((<NewExpression>node).typeArguments, visitor, isTypeNode),
+                    nodesVisitor((<NewExpression>node).arguments, visitor, isExpression));
 
             case SyntaxKind.TaggedTemplateExpression:
                 return updateTaggedTemplate(<TaggedTemplateExpression>node,
@@ -361,19 +361,19 @@ namespace ts {
 
             case SyntaxKind.FunctionExpression:
                 return updateFunctionExpression(<FunctionExpression>node,
-                    visitNodes((<FunctionExpression>node).modifiers, visitor, isModifier),
+                    nodesVisitor((<FunctionExpression>node).modifiers, visitor, isModifier),
                     (<FunctionExpression>node).asteriskToken,
                     visitNode((<FunctionExpression>node).name, visitor, isIdentifier),
-                    visitNodes((<FunctionExpression>node).typeParameters, visitor, isTypeParameter),
-                    visitParameterList((<FunctionExpression>node).parameters, visitor, context),
+                    nodesVisitor((<FunctionExpression>node).typeParameters, visitor, isTypeParameter),
+                    visitParameterList((<FunctionExpression>node).parameters, visitor, context, nodesVisitor),
                     visitNode((<FunctionExpression>node).type, visitor, isTypeNode),
                     visitFunctionBody((<FunctionExpression>node).body, visitor, context));
 
             case SyntaxKind.ArrowFunction:
                 return updateArrowFunction(<ArrowFunction>node,
-                    visitNodes((<ArrowFunction>node).modifiers, visitor, isModifier),
-                    visitNodes((<ArrowFunction>node).typeParameters, visitor, isTypeParameter),
-                    visitParameterList((<ArrowFunction>node).parameters, visitor, context),
+                    nodesVisitor((<ArrowFunction>node).modifiers, visitor, isModifier),
+                    nodesVisitor((<ArrowFunction>node).typeParameters, visitor, isTypeParameter),
+                    visitParameterList((<ArrowFunction>node).parameters, visitor, context, nodesVisitor),
                     visitNode((<ArrowFunction>node).type, visitor, isTypeNode),
                     visitFunctionBody((<ArrowFunction>node).body, visitor, context));
 
@@ -415,7 +415,7 @@ namespace ts {
             case SyntaxKind.TemplateExpression:
                 return updateTemplateExpression(<TemplateExpression>node,
                     visitNode((<TemplateExpression>node).head, visitor, isTemplateHead),
-                    visitNodes((<TemplateExpression>node).templateSpans, visitor, isTemplateSpan));
+                    nodesVisitor((<TemplateExpression>node).templateSpans, visitor, isTemplateSpan));
 
             case SyntaxKind.YieldExpression:
                 return updateYield(<YieldExpression>node,
@@ -428,15 +428,15 @@ namespace ts {
 
             case SyntaxKind.ClassExpression:
                 return updateClassExpression(<ClassExpression>node,
-                    visitNodes((<ClassExpression>node).modifiers, visitor, isModifier),
+                    nodesVisitor((<ClassExpression>node).modifiers, visitor, isModifier),
                     visitNode((<ClassExpression>node).name, visitor, isIdentifier),
-                    visitNodes((<ClassExpression>node).typeParameters, visitor, isTypeParameter),
-                    visitNodes((<ClassExpression>node).heritageClauses, visitor, isHeritageClause),
-                    visitNodes((<ClassExpression>node).members, visitor, isClassElement));
+                    nodesVisitor((<ClassExpression>node).typeParameters, visitor, isTypeParameter),
+                    nodesVisitor((<ClassExpression>node).heritageClauses, visitor, isHeritageClause),
+                    nodesVisitor((<ClassExpression>node).members, visitor, isClassElement));
 
             case SyntaxKind.ExpressionWithTypeArguments:
                 return updateExpressionWithTypeArguments(<ExpressionWithTypeArguments>node,
-                    visitNodes((<ExpressionWithTypeArguments>node).typeArguments, visitor, isTypeNode),
+                    nodesVisitor((<ExpressionWithTypeArguments>node).typeArguments, visitor, isTypeNode),
                     visitNode((<ExpressionWithTypeArguments>node).expression, visitor, isExpression));
 
             case SyntaxKind.AsExpression:
@@ -457,11 +457,11 @@ namespace ts {
             // Element
             case SyntaxKind.Block:
                 return updateBlock(<Block>node,
-                    visitNodes((<Block>node).statements, visitor, isStatement));
+                    nodesVisitor((<Block>node).statements, visitor, isStatement));
 
             case SyntaxKind.VariableStatement:
                 return updateVariableStatement(<VariableStatement>node,
-                    visitNodes((<VariableStatement>node).modifiers, visitor, isModifier),
+                    nodesVisitor((<VariableStatement>node).modifiers, visitor, isModifier),
                     visitNode((<VariableStatement>node).declarationList, visitor, isVariableDeclarationList));
 
             case SyntaxKind.ExpressionStatement:
@@ -549,61 +549,61 @@ namespace ts {
 
             case SyntaxKind.VariableDeclarationList:
                 return updateVariableDeclarationList(<VariableDeclarationList>node,
-                    visitNodes((<VariableDeclarationList>node).declarations, visitor, isVariableDeclaration));
+                    nodesVisitor((<VariableDeclarationList>node).declarations, visitor, isVariableDeclaration));
 
             case SyntaxKind.FunctionDeclaration:
                 return updateFunctionDeclaration(<FunctionDeclaration>node,
-                    visitNodes((<FunctionDeclaration>node).decorators, visitor, isDecorator),
-                    visitNodes((<FunctionDeclaration>node).modifiers, visitor, isModifier),
+                    nodesVisitor((<FunctionDeclaration>node).decorators, visitor, isDecorator),
+                    nodesVisitor((<FunctionDeclaration>node).modifiers, visitor, isModifier),
                     (<FunctionDeclaration>node).asteriskToken,
                     visitNode((<FunctionDeclaration>node).name, visitor, isIdentifier),
-                    visitNodes((<FunctionDeclaration>node).typeParameters, visitor, isTypeParameter),
-                    visitParameterList((<FunctionDeclaration>node).parameters, visitor, context),
+                    nodesVisitor((<FunctionDeclaration>node).typeParameters, visitor, isTypeParameter),
+                    visitParameterList((<FunctionDeclaration>node).parameters, visitor, context, nodesVisitor),
                     visitNode((<FunctionDeclaration>node).type, visitor, isTypeNode),
                     visitFunctionBody((<FunctionExpression>node).body, visitor, context));
 
             case SyntaxKind.ClassDeclaration:
                 return updateClassDeclaration(<ClassDeclaration>node,
-                    visitNodes((<ClassDeclaration>node).decorators, visitor, isDecorator),
-                    visitNodes((<ClassDeclaration>node).modifiers, visitor, isModifier),
+                    nodesVisitor((<ClassDeclaration>node).decorators, visitor, isDecorator),
+                    nodesVisitor((<ClassDeclaration>node).modifiers, visitor, isModifier),
                     visitNode((<ClassDeclaration>node).name, visitor, isIdentifier),
-                    visitNodes((<ClassDeclaration>node).typeParameters, visitor, isTypeParameter),
-                    visitNodes((<ClassDeclaration>node).heritageClauses, visitor, isHeritageClause),
-                    visitNodes((<ClassDeclaration>node).members, visitor, isClassElement));
+                    nodesVisitor((<ClassDeclaration>node).typeParameters, visitor, isTypeParameter),
+                    nodesVisitor((<ClassDeclaration>node).heritageClauses, visitor, isHeritageClause),
+                    nodesVisitor((<ClassDeclaration>node).members, visitor, isClassElement));
 
             case SyntaxKind.EnumDeclaration:
                 return updateEnumDeclaration(<EnumDeclaration>node,
-                    visitNodes((<EnumDeclaration>node).decorators, visitor, isDecorator),
-                    visitNodes((<EnumDeclaration>node).modifiers, visitor, isModifier),
+                    nodesVisitor((<EnumDeclaration>node).decorators, visitor, isDecorator),
+                    nodesVisitor((<EnumDeclaration>node).modifiers, visitor, isModifier),
                     visitNode((<EnumDeclaration>node).name, visitor, isIdentifier),
-                    visitNodes((<EnumDeclaration>node).members, visitor, isEnumMember));
+                    nodesVisitor((<EnumDeclaration>node).members, visitor, isEnumMember));
 
             case SyntaxKind.ModuleDeclaration:
                 return updateModuleDeclaration(<ModuleDeclaration>node,
-                    visitNodes((<ModuleDeclaration>node).decorators, visitor, isDecorator),
-                    visitNodes((<ModuleDeclaration>node).modifiers, visitor, isModifier),
+                    nodesVisitor((<ModuleDeclaration>node).decorators, visitor, isDecorator),
+                    nodesVisitor((<ModuleDeclaration>node).modifiers, visitor, isModifier),
                     visitNode((<ModuleDeclaration>node).name, visitor, isIdentifier),
                     visitNode((<ModuleDeclaration>node).body, visitor, isModuleBody));
 
             case SyntaxKind.ModuleBlock:
                 return updateModuleBlock(<ModuleBlock>node,
-                    visitNodes((<ModuleBlock>node).statements, visitor, isStatement));
+                    nodesVisitor((<ModuleBlock>node).statements, visitor, isStatement));
 
             case SyntaxKind.CaseBlock:
                 return updateCaseBlock(<CaseBlock>node,
-                    visitNodes((<CaseBlock>node).clauses, visitor, isCaseOrDefaultClause));
+                    nodesVisitor((<CaseBlock>node).clauses, visitor, isCaseOrDefaultClause));
 
             case SyntaxKind.ImportEqualsDeclaration:
                 return updateImportEqualsDeclaration(<ImportEqualsDeclaration>node,
-                    visitNodes((<ImportEqualsDeclaration>node).decorators, visitor, isDecorator),
-                    visitNodes((<ImportEqualsDeclaration>node).modifiers, visitor, isModifier),
+                    nodesVisitor((<ImportEqualsDeclaration>node).decorators, visitor, isDecorator),
+                    nodesVisitor((<ImportEqualsDeclaration>node).modifiers, visitor, isModifier),
                     visitNode((<ImportEqualsDeclaration>node).name, visitor, isIdentifier),
                     visitNode((<ImportEqualsDeclaration>node).moduleReference, visitor, isModuleReference));
 
             case SyntaxKind.ImportDeclaration:
                 return updateImportDeclaration(<ImportDeclaration>node,
-                    visitNodes((<ImportDeclaration>node).decorators, visitor, isDecorator),
-                    visitNodes((<ImportDeclaration>node).modifiers, visitor, isModifier),
+                    nodesVisitor((<ImportDeclaration>node).decorators, visitor, isDecorator),
+                    nodesVisitor((<ImportDeclaration>node).modifiers, visitor, isModifier),
                     visitNode((<ImportDeclaration>node).importClause, visitor, isImportClause),
                     visitNode((<ImportDeclaration>node).moduleSpecifier, visitor, isExpression));
 
@@ -618,7 +618,7 @@ namespace ts {
 
             case SyntaxKind.NamedImports:
                 return updateNamedImports(<NamedImports>node,
-                    visitNodes((<NamedImports>node).elements, visitor, isImportSpecifier));
+                    nodesVisitor((<NamedImports>node).elements, visitor, isImportSpecifier));
 
             case SyntaxKind.ImportSpecifier:
                 return updateImportSpecifier(<ImportSpecifier>node,
@@ -627,20 +627,20 @@ namespace ts {
 
             case SyntaxKind.ExportAssignment:
                 return updateExportAssignment(<ExportAssignment>node,
-                    visitNodes((<ExportAssignment>node).decorators, visitor, isDecorator),
-                    visitNodes((<ExportAssignment>node).modifiers, visitor, isModifier),
+                    nodesVisitor((<ExportAssignment>node).decorators, visitor, isDecorator),
+                    nodesVisitor((<ExportAssignment>node).modifiers, visitor, isModifier),
                     visitNode((<ExportAssignment>node).expression, visitor, isExpression));
 
             case SyntaxKind.ExportDeclaration:
                 return updateExportDeclaration(<ExportDeclaration>node,
-                    visitNodes((<ExportDeclaration>node).decorators, visitor, isDecorator),
-                    visitNodes((<ExportDeclaration>node).modifiers, visitor, isModifier),
+                    nodesVisitor((<ExportDeclaration>node).decorators, visitor, isDecorator),
+                    nodesVisitor((<ExportDeclaration>node).modifiers, visitor, isModifier),
                     visitNode((<ExportDeclaration>node).exportClause, visitor, isNamedExports),
                     visitNode((<ExportDeclaration>node).moduleSpecifier, visitor, isExpression));
 
             case SyntaxKind.NamedExports:
                 return updateNamedExports(<NamedExports>node,
-                    visitNodes((<NamedExports>node).elements, visitor, isExportSpecifier));
+                    nodesVisitor((<NamedExports>node).elements, visitor, isExportSpecifier));
 
             case SyntaxKind.ExportSpecifier:
                 return updateExportSpecifier(<ExportSpecifier>node,
@@ -656,12 +656,12 @@ namespace ts {
             case SyntaxKind.JsxElement:
                 return updateJsxElement(<JsxElement>node,
                     visitNode((<JsxElement>node).openingElement, visitor, isJsxOpeningElement),
-                    visitNodes((<JsxElement>node).children, visitor, isJsxChild),
+                    nodesVisitor((<JsxElement>node).children, visitor, isJsxChild),
                     visitNode((<JsxElement>node).closingElement, visitor, isJsxClosingElement));
 
             case SyntaxKind.JsxAttributes:
                 return updateJsxAttributes(<JsxAttributes>node,
-                    visitNodes((<JsxAttributes>node).properties, visitor, isJsxAttributeLike));
+                    nodesVisitor((<JsxAttributes>node).properties, visitor, isJsxAttributeLike));
 
             case SyntaxKind.JsxSelfClosingElement:
                 return updateJsxSelfClosingElement(<JsxSelfClosingElement>node,
@@ -694,15 +694,15 @@ namespace ts {
             case SyntaxKind.CaseClause:
                 return updateCaseClause(<CaseClause>node,
                     visitNode((<CaseClause>node).expression, visitor, isExpression),
-                    visitNodes((<CaseClause>node).statements, visitor, isStatement));
+                    nodesVisitor((<CaseClause>node).statements, visitor, isStatement));
 
             case SyntaxKind.DefaultClause:
                 return updateDefaultClause(<DefaultClause>node,
-                    visitNodes((<DefaultClause>node).statements, visitor, isStatement));
+                    nodesVisitor((<DefaultClause>node).statements, visitor, isStatement));
 
             case SyntaxKind.HeritageClause:
                 return updateHeritageClause(<HeritageClause>node,
-                    visitNodes((<HeritageClause>node).types, visitor, isExpressionWithTypeArguments));
+                    nodesVisitor((<HeritageClause>node).types, visitor, isExpressionWithTypeArguments));
 
             case SyntaxKind.CatchClause:
                 return updateCatchClause(<CatchClause>node,
diff --git a/src/harness/fourslash.ts b/src/harness/fourslash.ts
index 11103bf6e2d..e105553e2a7 100644
--- a/src/harness/fourslash.ts
+++ b/src/harness/fourslash.ts
@@ -22,6 +22,10 @@
 namespace FourSlash {
     ts.disableIncrementalParsing = false;
 
+    function normalizeNewLines(s: string) {
+        return s.replace(/\r\n/g, "\n");
+    }
+
     // Represents a parsed source file with metadata
     export interface FourSlashFile {
         // The contents of the file (with markers, etc stripped out)
@@ -1958,8 +1962,7 @@ namespace FourSlash {
 
         public verifyCurrentFileContent(text: string) {
             const actual = this.getFileContent(this.activeFile.fileName);
-            const replaceNewlines = (str: string) => str.replace(/\r\n/g, "\n");
-            if (replaceNewlines(actual) !== replaceNewlines(text)) {
+            if (normalizeNewLines(actual) !== normalizeNewLines(text)) {
                 throw new Error("verifyCurrentFileContent\n" +
                     "\tExpected: \"" + text + "\"\n" +
                     "\t  Actual: \"" + actual + "\"");
@@ -2135,7 +2138,7 @@ namespace FourSlash {
             const actualText = this.rangeText(ranges[0]);
 
             const result = includeWhiteSpace
-                ? actualText === expectedText
+                ? normalizeNewLines(actualText) === normalizeNewLines(expectedText)
                 : this.removeWhitespace(actualText) === this.removeWhitespace(expectedText);
 
             if (!result) {
@@ -2185,7 +2188,7 @@ namespace FourSlash {
                     continue;
                 }
 
-                const newActions = this.languageService.getCodeFixesAtPosition(fileName, diagnostic.start, diagnostic.length, [diagnostic.code]);
+                const newActions = this.languageService.getCodeFixesAtPosition(fileName, diagnostic.start, diagnostic.length, [diagnostic.code], this.formatCodeSettings);
                 if (newActions && newActions.length) {
                     actions = actions ? actions.concat(newActions) : newActions;
                 }
@@ -2248,22 +2251,23 @@ namespace FourSlash {
 
             if (expected === undefined) {
                 if (actual) {
-                    this.raiseError(name + " failed - expected no template but got {newText: \"" + actual.newText + "\" caretOffset: " + actual.caretOffset + "}");
+                    this.raiseError(`${name} failed - expected no template but got {newText: "${actual.newText}", caretOffset: ${actual.caretOffset}}`);
                 }
 
                 return;
             }
             else {
                 if (actual === undefined) {
-                    this.raiseError(name + " failed - expected the template {newText: \"" + actual.newText + "\" caretOffset: " + actual.caretOffset + "} but got nothing instead");
+                    this.raiseError(`${name} failed - expected the template {newText: "${expected.newText}", caretOffset: "${expected.caretOffset}"} but got nothing instead`);
+                    
                 }
 
                 if (actual.newText !== expected.newText) {
-                    this.raiseError(name + " failed - expected insertion:\n" + this.clarifyNewlines(expected.newText) + "\nactual insertion:\n" + this.clarifyNewlines(actual.newText));
+                    this.raiseError(`${name} failed - expected insertion:\n"${this.clarifyNewlines(expected.newText)}"\nactual insertion:\n"${this.clarifyNewlines(actual.newText)}"`);
                 }
 
                 if (actual.caretOffset !== expected.caretOffset) {
-                    this.raiseError(name + " failed - expected caretOffset: " + expected.caretOffset + ",\nactual caretOffset:" + actual.caretOffset);
+                    this.raiseError(`${name} failed - expected caretOffset: ${expected.caretOffset}\nactual caretOffset:${actual.caretOffset}`);
                 }
             }
         }
diff --git a/src/harness/tsconfig.json b/src/harness/tsconfig.json
index 9f0e30baa1c..4fded517e19 100644
--- a/src/harness/tsconfig.json
+++ b/src/harness/tsconfig.json
@@ -126,6 +126,7 @@
         "./unittests/projectErrors.ts",
         "./unittests/printer.ts",
         "./unittests/transform.ts",
-        "./unittests/customTransforms.ts"
+        "./unittests/customTransforms.ts",
+        "./unittests/textChanges.ts"
     ]
 }
diff --git a/src/harness/unittests/textChanges.ts b/src/harness/unittests/textChanges.ts
new file mode 100644
index 00000000000..8269b6de6be
--- /dev/null
+++ b/src/harness/unittests/textChanges.ts
@@ -0,0 +1,791 @@
+/// <reference path="..\..\compiler\emitter.ts" />
+/// <reference path="..\..\services\textChanges.ts" />
+/// <reference path="..\harness.ts" />
+
+namespace ts {
+    describe("textChanges", () => {
+        function findChild(name: string, n: Node) {
+            return find(n);
+
+            function find(node: Node): Node {
+                if (isDeclaration(node) && node.name && isIdentifier(node.name) && node.name.text === name) {
+                    return node;
+                }
+                else {
+                    return forEachChild(node, find);
+                }
+            }
+        }
+
+        const printerOptions = { newLine: NewLineKind.LineFeed };
+        const newLineCharacter = getNewLineCharacter(printerOptions);
+
+        function getRuleProvider(action?: (opts: FormatCodeSettings) => void) {
+            const options = {
+                indentSize: 4,
+                tabSize: 4,
+                newLineCharacter,
+                convertTabsToSpaces: true,
+                indentStyle: ts.IndentStyle.Smart,
+                insertSpaceAfterConstructor: false,
+                insertSpaceAfterCommaDelimiter: true,
+                insertSpaceAfterSemicolonInForStatements: true,
+                insertSpaceBeforeAndAfterBinaryOperators: true,
+                insertSpaceAfterKeywordsInControlFlowStatements: true,
+                insertSpaceAfterFunctionKeywordForAnonymousFunctions: false,
+                insertSpaceAfterOpeningAndBeforeClosingNonemptyParenthesis: false,
+                insertSpaceAfterOpeningAndBeforeClosingNonemptyBrackets: false,
+                insertSpaceAfterOpeningAndBeforeClosingNonemptyBraces: true,
+                insertSpaceAfterOpeningAndBeforeClosingTemplateStringBraces: false,
+                insertSpaceAfterOpeningAndBeforeClosingJsxExpressionBraces: false,
+                insertSpaceBeforeFunctionParenthesis: false,
+                placeOpenBraceOnNewLineForFunctions: false,
+                placeOpenBraceOnNewLineForControlBlocks: false,
+            };
+            if (action) {
+                action(options);
+            }
+            const rulesProvider = new formatting.RulesProvider();
+            rulesProvider.ensureUpToDate(options);
+            return rulesProvider;
+        }
+
+        // validate that positions that were recovered from the printed text actually match positions that will be created if the same text is parsed.
+        function verifyPositions({ text, node }: textChanges.NonFormattedText): void {
+            const nodeList = flattenNodes(node);
+            const sourceFile = createSourceFile("f.ts", text, ScriptTarget.ES2015);
+            const parsedNodeList = flattenNodes(sourceFile.statements[0]);
+            Debug.assert(nodeList.length === parsedNodeList.length);
+            for (let i = 0; i < nodeList.length; i++) {
+                const left = nodeList[i];
+                const right = parsedNodeList[i];
+                Debug.assert(left.pos === right.pos);
+                Debug.assert(left.end === right.end);
+            }
+
+            function flattenNodes(n: Node) {
+                const data: (Node | NodeArray<any>)[] = [];
+                walk(n);
+                return data;
+
+                function walk(n: Node | Node[]): void {
+                    data.push(<any>n);
+                    return isArray(n) ? forEach(n, walk) : forEachChild(n, walk, walk);
+                }
+            }
+        }
+
+        function runSingleFileTest(caption: string, setupFormatOptions: (opts: FormatCodeSettings) => void, text: string, validateNodes: boolean, testBlock: (sourceFile: SourceFile, changeTracker: textChanges.ChangeTracker) => void) {
+            it(caption, () => {
+                Harness.Baseline.runBaseline(`textChanges/${caption}.js`, () => {
+                    const sourceFile = createSourceFile("source.ts", text, ScriptTarget.ES2015, /*setParentNodes*/ true);
+                    const rulesProvider = getRuleProvider(setupFormatOptions);
+                    const changeTracker = new textChanges.ChangeTracker(printerOptions.newLine, rulesProvider, validateNodes ? verifyPositions : undefined);
+                    testBlock(sourceFile, changeTracker);
+                    const changes = changeTracker.getChanges();
+                    assert.equal(changes.length, 1);
+                    assert.equal(changes[0].fileName, sourceFile.fileName);
+                    const modified = textChanges.applyChanges(sourceFile.text, changes[0].textChanges);
+                    return `===ORIGINAL===${newLineCharacter}${text}${newLineCharacter}===MODIFIED===${newLineCharacter}${modified}`;
+                });
+            });
+        }
+
+        function setNewLineForOpenBraceInFunctions(opts: FormatCodeSettings) {
+            opts.placeOpenBraceOnNewLineForFunctions = true;
+        }
+
+        {
+            const text = `
+namespace M 
+{
+    namespace M2 
+    {
+        function foo() {
+            // comment 1
+            const x = 1;
+
+            /**
+             * comment 2 line 1
+             * comment 2 line 2
+             */
+            function f() {
+                return 100;
+            }
+            const y = 2; // comment 3
+            return 1;
+        }
+    }
+}`;
+            runSingleFileTest("extractMethodLike", setNewLineForOpenBraceInFunctions, text, /*validateNodes*/ true, (sourceFile, changeTracker) => {
+                const statements = (<Block>(<FunctionDeclaration>findChild("foo", sourceFile)).body).statements.slice(1);
+                const newFunction = createFunctionDeclaration(
+                        /*decorators*/ undefined,
+                        /*modifiers*/ undefined,
+                        /*asteriskToken*/ undefined,
+                        /*name*/ "bar",
+                        /*typeParameters*/ undefined,
+                        /*parameters*/ emptyArray,
+                        /*type*/ createKeywordTypeNode(SyntaxKind.AnyKeyword),
+                        /*body */ createBlock(statements)
+                );
+
+                changeTracker.insertNodeBefore(sourceFile, /*before*/findChild("M2", sourceFile), newFunction, { suffix: newLineCharacter });
+
+                // replace statements with return statement
+                const newStatement = createReturn(
+                    createCall(
+                        /*expression*/ newFunction.name,
+                        /*typeArguments*/ undefined,
+                        /*argumentsArray*/ emptyArray
+                    ));
+                changeTracker.replaceNodeRange(sourceFile, statements[0], lastOrUndefined(statements), newStatement, { suffix: newLineCharacter });
+            });
+        }
+        {
+            const text = `
+function foo() {
+    return 1;
+}
+
+function bar() {
+    return 2;
+}
+`;
+            runSingleFileTest("deleteRange1", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteRange(sourceFile, { pos: text.indexOf("function foo"), end: text.indexOf("function bar") });
+            });
+        }
+        function findVariableStatementContaining(name: string, sourceFile: SourceFile) {
+            const varDecl = findChild(name, sourceFile);
+            assert.equal(varDecl.kind, SyntaxKind.VariableDeclaration);
+            const varStatement = varDecl.parent.parent;
+            assert.equal(varStatement.kind, SyntaxKind.VariableStatement);
+            return varStatement;
+        }
+        {
+            const text = `
+var x = 1; // some comment - 1
+/**
+ * comment 2
+ */
+var y = 2; // comment 3
+var z = 3; // comment 4
+`;
+            runSingleFileTest("deleteNode1", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNode(sourceFile, findVariableStatementContaining("y", sourceFile));
+            });
+            runSingleFileTest("deleteNode2", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNode(sourceFile, findVariableStatementContaining("y", sourceFile), { useNonAdjustedStartPosition: true });
+            });
+            runSingleFileTest("deleteNode3", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNode(sourceFile, findVariableStatementContaining("y", sourceFile), { useNonAdjustedEndPosition: true });
+            });
+            runSingleFileTest("deleteNode4", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNode(sourceFile, findVariableStatementContaining("y", sourceFile), { useNonAdjustedStartPosition: true, useNonAdjustedEndPosition: true });
+            });
+            runSingleFileTest("deleteNode5", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNode(sourceFile, findVariableStatementContaining("x", sourceFile));
+            });
+        }
+        {
+            const text = `
+// comment 1
+var x = 1; // comment 2
+// comment 3
+var y = 2; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
+`;
+            runSingleFileTest("deleteNodeRange1", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeRange(sourceFile, findVariableStatementContaining("y", sourceFile), findVariableStatementContaining("z", sourceFile));
+            });
+            runSingleFileTest("deleteNodeRange2", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeRange(sourceFile, findVariableStatementContaining("y", sourceFile), findVariableStatementContaining("z", sourceFile),
+                    { useNonAdjustedStartPosition: true });
+            });
+            runSingleFileTest("deleteNodeRange3", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeRange(sourceFile, findVariableStatementContaining("y", sourceFile), findVariableStatementContaining("z", sourceFile),
+                    { useNonAdjustedEndPosition: true });
+            });
+            runSingleFileTest("deleteNodeRange4", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeRange(sourceFile, findVariableStatementContaining("y", sourceFile), findVariableStatementContaining("z", sourceFile),
+                    { useNonAdjustedStartPosition: true, useNonAdjustedEndPosition: true });
+            });
+        }
+        function createTestVariableDeclaration(name: string) {
+            return createVariableDeclaration(name, /*type*/ undefined, createObjectLiteral([createPropertyAssignment("p1", createLiteral(1))], /*multiline*/ true));
+        }
+        function createTestClass() {
+            return createClassDeclaration(
+                    /*decorators*/ undefined,
+                [
+                    createToken(SyntaxKind.PublicKeyword)
+                ],
+                "class1",
+                    /*typeParameters*/ undefined,
+                [
+                    createHeritageClause(
+                        SyntaxKind.ImplementsKeyword,
+                        [
+                            createExpressionWithTypeArguments(/*typeArguments*/ undefined, createIdentifier("interface1"))
+                        ]
+                    )
+                ],
+                [
+                    createProperty(
+                            /*decorators*/ undefined,
+                            /*modifiers*/ undefined,
+                        "property1",
+                            /*questionToken*/ undefined,
+                        createKeywordTypeNode(SyntaxKind.BooleanKeyword),
+                            /*initializer*/ undefined
+                    )
+                ]
+            );
+        }
+        {
+            const text = `
+// comment 1
+var x = 1; // comment 2
+// comment 3
+var y = 2; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7`;
+            runSingleFileTest("replaceRange", setNewLineForOpenBraceInFunctions, text, /*validateNodes*/ true, (sourceFile, changeTracker) => {
+                changeTracker.replaceRange(sourceFile, { pos: text.indexOf("var y"), end: text.indexOf("var a") }, createTestClass(), { suffix: newLineCharacter });
+            });
+            runSingleFileTest("replaceRangeWithForcedIndentation", setNewLineForOpenBraceInFunctions, text, /*validateNodes*/ true, (sourceFile, changeTracker) => {
+                changeTracker.replaceRange(sourceFile, { pos: text.indexOf("var y"), end: text.indexOf("var a") }, createTestClass(), { suffix: newLineCharacter, indentation: 8, delta: 0 });
+            });
+
+            runSingleFileTest("replaceRangeNoLineBreakBefore", setNewLineForOpenBraceInFunctions, `const x = 1, y = "2";`, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                const newNode = createTestVariableDeclaration("z1");
+                changeTracker.replaceRange(sourceFile, { pos: sourceFile.text.indexOf("y"), end: sourceFile.text.indexOf(";") }, newNode);
+            });
+        }
+        {
+            const text = `
+namespace A {
+    const x = 1, y = "2";
+}
+`;
+            runSingleFileTest("replaceNode1NoLineBreakBefore", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                const newNode = createTestVariableDeclaration("z1");
+                changeTracker.replaceNode(sourceFile, findChild("y", sourceFile), newNode);
+            });
+        }
+        {
+            const text = `
+// comment 1
+var x = 1; // comment 2
+// comment 3
+var y = 2; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7`;
+            runSingleFileTest("replaceNode1", setNewLineForOpenBraceInFunctions, text, /*validateNodes*/ true, (sourceFile, changeTracker) => {
+                changeTracker.replaceNode(sourceFile, findVariableStatementContaining("y", sourceFile), createTestClass(), { suffix: newLineCharacter });
+            });
+            runSingleFileTest("replaceNode2", setNewLineForOpenBraceInFunctions, text, /*validateNodes*/ true, (sourceFile, changeTracker) => {
+                changeTracker.replaceNode(sourceFile, findVariableStatementContaining("y", sourceFile), createTestClass(), { useNonAdjustedStartPosition: true, suffix: newLineCharacter, prefix: newLineCharacter });
+            });
+            runSingleFileTest("replaceNode3", setNewLineForOpenBraceInFunctions, text, /*validateNodes*/ true, (sourceFile, changeTracker) => {
+                changeTracker.replaceNode(sourceFile, findVariableStatementContaining("y", sourceFile), createTestClass(), { useNonAdjustedEndPosition: true, suffix: newLineCharacter });
+            });
+            runSingleFileTest("replaceNode4", setNewLineForOpenBraceInFunctions, text, /*validateNodes*/ true, (sourceFile, changeTracker) => {
+                changeTracker.replaceNode(sourceFile, findVariableStatementContaining("y", sourceFile), createTestClass(), { useNonAdjustedStartPosition: true, useNonAdjustedEndPosition: true });
+            });
+            runSingleFileTest("replaceNode5", setNewLineForOpenBraceInFunctions, text, /*validateNodes*/ true, (sourceFile, changeTracker) => {
+                changeTracker.replaceNode(sourceFile, findVariableStatementContaining("x", sourceFile), createTestClass(), { useNonAdjustedStartPosition: true, useNonAdjustedEndPosition: true });
+            });
+        }
+        {
+            const text = `
+// comment 1
+var x = 1; // comment 2
+// comment 3
+var y = 2; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7`;
+            runSingleFileTest("replaceNodeRange1", setNewLineForOpenBraceInFunctions, text, /*validateNodes*/ true, (sourceFile, changeTracker) => {
+                changeTracker.replaceNodeRange(sourceFile, findVariableStatementContaining("y", sourceFile), findVariableStatementContaining("z", sourceFile), createTestClass(), { suffix: newLineCharacter });
+            });
+            runSingleFileTest("replaceNodeRange2", setNewLineForOpenBraceInFunctions, text, /*validateNodes*/ true, (sourceFile, changeTracker) => {
+                changeTracker.replaceNodeRange(sourceFile, findVariableStatementContaining("y", sourceFile), findVariableStatementContaining("z", sourceFile), createTestClass(), { useNonAdjustedStartPosition: true, suffix: newLineCharacter, prefix: newLineCharacter });
+            });
+            runSingleFileTest("replaceNodeRange3", setNewLineForOpenBraceInFunctions, text, /*validateNodes*/ true, (sourceFile, changeTracker) => {
+                changeTracker.replaceNodeRange(sourceFile, findVariableStatementContaining("y", sourceFile), findVariableStatementContaining("z", sourceFile), createTestClass(), { useNonAdjustedEndPosition: true, suffix: newLineCharacter });
+            });
+            runSingleFileTest("replaceNodeRange4", setNewLineForOpenBraceInFunctions, text, /*validateNodes*/ true, (sourceFile, changeTracker) => {
+                changeTracker.replaceNodeRange(sourceFile, findVariableStatementContaining("y", sourceFile), findVariableStatementContaining("z", sourceFile), createTestClass(), { useNonAdjustedStartPosition: true, useNonAdjustedEndPosition: true });
+            });
+        }
+        {
+            const text = `
+// comment 1
+var x = 1; // comment 2
+// comment 3
+var y; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7`;
+            runSingleFileTest("insertNodeAt1", setNewLineForOpenBraceInFunctions, text, /*validateNodes*/ true, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeAt(sourceFile, text.indexOf("var y"), createTestClass(), { suffix: newLineCharacter });
+            });
+            runSingleFileTest("insertNodeAt2", setNewLineForOpenBraceInFunctions, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeAt(sourceFile, text.indexOf("; // comment 4"), createTestVariableDeclaration("z1"));
+            });
+        }
+        {
+            const text = `
+namespace M {
+    // comment 1
+    var x = 1; // comment 2
+    // comment 3
+    var y; // comment 4
+    var z = 3; // comment 5
+    // comment 6
+    var a = 4; // comment 7
+}`;
+            runSingleFileTest("insertNodeBefore1", setNewLineForOpenBraceInFunctions, text, /*validateNodes*/ true, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeBefore(sourceFile, findVariableStatementContaining("y", sourceFile), createTestClass(), { suffix: newLineCharacter });
+            });
+            runSingleFileTest("insertNodeBefore2", setNewLineForOpenBraceInFunctions, text, /*validateNodes*/ true, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeBefore(sourceFile, findChild("M", sourceFile), createTestClass(), { suffix: newLineCharacter });
+            });
+            runSingleFileTest("insertNodeAfter1", setNewLineForOpenBraceInFunctions, text, /*validateNodes*/ true, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeAfter(sourceFile, findVariableStatementContaining("y", sourceFile), createTestClass(), { suffix: newLineCharacter });
+            });
+            runSingleFileTest("insertNodeAfter2", setNewLineForOpenBraceInFunctions, text, /*validateNodes*/ true, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeAfter(sourceFile, findChild("M", sourceFile), createTestClass(), { prefix: newLineCharacter });
+            });
+        }
+        {
+            function findOpenBraceForConstructor(sourceFile: SourceFile) {
+                const classDecl = <ClassDeclaration>sourceFile.statements[0];
+                const constructorDecl = forEach(classDecl.members, m => m.kind === SyntaxKind.Constructor && (<ConstructorDeclaration>m).body && <ConstructorDeclaration>m);
+                return constructorDecl.body.getFirstToken();
+            }
+            function createTestSuperCall() {
+                const superCall = createCall(
+                    createSuper(),
+                    /*typeArguments*/ undefined,
+                    /*argumentsArray*/ emptyArray
+                );
+                return createStatement(superCall);
+            }
+            const text1 = `
+class A {
+    constructor() {
+    }
+}
+`;
+            runSingleFileTest("insertNodeAfter3", noop, text1, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeAfter(sourceFile, findOpenBraceForConstructor(sourceFile), createTestSuperCall(), { suffix: newLineCharacter });
+            });
+            const text2 = `
+class A {
+    constructor() {
+        var x = 1;
+    }
+}
+`;
+            runSingleFileTest("insertNodeAfter4", noop, text2, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeAfter(sourceFile, findVariableStatementContaining("x", sourceFile), createTestSuperCall(), { suffix: newLineCharacter });
+            });
+            const text3 = `
+class A {
+    constructor() {
+
+    }
+}
+`;
+            runSingleFileTest("insertNodeAfter3-block with newline", noop, text3, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeAfter(sourceFile, findOpenBraceForConstructor(sourceFile), createTestSuperCall(), { suffix: newLineCharacter });
+            });
+        }
+        {
+            const text = `var a = 1, b = 2, c = 3;`;
+            runSingleFileTest("deleteNodeInList1", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeInList(sourceFile, findChild("a", sourceFile));
+            });
+            runSingleFileTest("deleteNodeInList2", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeInList(sourceFile, findChild("b", sourceFile));
+            });
+            runSingleFileTest("deleteNodeInList3", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeInList(sourceFile, findChild("c", sourceFile));
+            });
+        }
+        {
+            const text = `var a = 1,b = 2,c = 3;`;
+            runSingleFileTest("deleteNodeInList1_1", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeInList(sourceFile, findChild("a", sourceFile));
+            });
+            runSingleFileTest("deleteNodeInList2_1", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeInList(sourceFile, findChild("b", sourceFile));
+            });
+            runSingleFileTest("deleteNodeInList3_1", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeInList(sourceFile, findChild("c", sourceFile));
+            });
+        }
+        {
+            const text = `
+namespace M {
+    var a = 1,
+        b = 2,
+        c = 3;
+}`;
+            runSingleFileTest("deleteNodeInList4", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeInList(sourceFile, findChild("a", sourceFile));
+            });
+            runSingleFileTest("deleteNodeInList5", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeInList(sourceFile, findChild("b", sourceFile));
+            });
+            runSingleFileTest("deleteNodeInList6", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeInList(sourceFile, findChild("c", sourceFile));
+            });
+        }
+        {
+            const text = `
+namespace M {
+    var a = 1, // comment 1
+        // comment 2
+        b = 2, // comment 3
+        // comment 4
+        c = 3; // comment 5
+}`;
+            runSingleFileTest("deleteNodeInList4_1", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeInList(sourceFile, findChild("a", sourceFile));
+            });
+            runSingleFileTest("deleteNodeInList5_1", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeInList(sourceFile, findChild("b", sourceFile));
+            });
+            runSingleFileTest("deleteNodeInList6_1", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeInList(sourceFile, findChild("c", sourceFile));
+            });
+        }
+        {
+            const text = `
+function foo(a: number, b: string, c = true) {
+    return 1;
+}`;
+            runSingleFileTest("deleteNodeInList7", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeInList(sourceFile, findChild("a", sourceFile));
+            });
+            runSingleFileTest("deleteNodeInList8", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeInList(sourceFile, findChild("b", sourceFile));
+            });
+            runSingleFileTest("deleteNodeInList9", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeInList(sourceFile, findChild("c", sourceFile));
+            });
+        }
+        {
+            const text = `
+function foo(a: number,b: string,c = true) {
+    return 1;
+}`;
+            runSingleFileTest("deleteNodeInList10", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeInList(sourceFile, findChild("a", sourceFile));
+            });
+            runSingleFileTest("deleteNodeInList11", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeInList(sourceFile, findChild("b", sourceFile));
+            });
+            runSingleFileTest("deleteNodeInList12", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeInList(sourceFile, findChild("c", sourceFile));
+            });
+        }
+        {
+            const text = `
+function foo(
+    a: number,
+    b: string,
+    c = true) {
+    return 1;
+}`;
+            runSingleFileTest("deleteNodeInList13", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeInList(sourceFile, findChild("a", sourceFile));
+            });
+            runSingleFileTest("deleteNodeInList14", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeInList(sourceFile, findChild("b", sourceFile));
+            });
+            runSingleFileTest("deleteNodeInList15", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNodeInList(sourceFile, findChild("c", sourceFile));
+            });
+        }
+        {
+            const text = `
+const x = 1, y = 2;`;
+            runSingleFileTest("insertNodeInListAfter1", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeInListAfter(sourceFile, findChild("x", sourceFile), createVariableDeclaration("z", /*type*/ undefined, createLiteral(1)));
+            });
+            runSingleFileTest("insertNodeInListAfter2", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeInListAfter(sourceFile, findChild("y", sourceFile), createVariableDeclaration("z", /*type*/ undefined, createLiteral(1)));
+            });
+        }
+        {
+            const text = `
+const /*x*/ x = 1, /*y*/ y = 2;`;
+            runSingleFileTest("insertNodeInListAfter3", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeInListAfter(sourceFile, findChild("x", sourceFile), createVariableDeclaration("z", /*type*/ undefined, createLiteral(1)));
+            });
+            runSingleFileTest("insertNodeInListAfter4", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeInListAfter(sourceFile, findChild("y", sourceFile), createVariableDeclaration("z", /*type*/ undefined, createLiteral(1)));
+            });
+        }
+        {
+            const text = `
+const x = 1;`;
+            runSingleFileTest("insertNodeInListAfter5", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeInListAfter(sourceFile, findChild("x", sourceFile), createVariableDeclaration("z", /*type*/ undefined, createLiteral(1)));
+            });
+        }
+        {
+            const text = `
+const x = 1, 
+    y = 2;`;
+            runSingleFileTest("insertNodeInListAfter6", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeInListAfter(sourceFile, findChild("x", sourceFile), createVariableDeclaration("z", /*type*/ undefined, createLiteral(1)));
+            });
+            runSingleFileTest("insertNodeInListAfter7", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeInListAfter(sourceFile, findChild("y", sourceFile), createVariableDeclaration("z", /*type*/ undefined, createLiteral(1)));
+            });
+        }
+        {
+            const text = `
+const /*x*/ x = 1, 
+    /*y*/ y = 2;`;
+            runSingleFileTest("insertNodeInListAfter8", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeInListAfter(sourceFile, findChild("x", sourceFile), createVariableDeclaration("z", /*type*/ undefined, createLiteral(1)));
+            });
+            runSingleFileTest("insertNodeInListAfter9", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeInListAfter(sourceFile, findChild("y", sourceFile), createVariableDeclaration("z", /*type*/ undefined, createLiteral(1)));
+            });
+        }
+        {
+            const text = `
+import {
+    x
+} from "bar"`;
+            runSingleFileTest("insertNodeInListAfter10", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeInListAfter(sourceFile, findChild("x", sourceFile), createImportSpecifier(createIdentifier("b"), createIdentifier("a")));
+            })
+        }
+        {
+            const text = `
+import {
+    x // this is x
+} from "bar"`;
+            runSingleFileTest("insertNodeInListAfter11", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeInListAfter(sourceFile, findChild("x", sourceFile), createImportSpecifier(createIdentifier("b"), createIdentifier("a")));
+            })
+        }
+        {
+            const text = `
+import {
+    x
+} from "bar"`;
+            runSingleFileTest("insertNodeInListAfter12", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeInListAfter(sourceFile, findChild("x", sourceFile), createImportSpecifier(undefined, createIdentifier("a")));
+            })
+        }
+        {
+            const text = `
+import {
+    x // this is x
+} from "bar"`;
+            runSingleFileTest("insertNodeInListAfter13", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeInListAfter(sourceFile, findChild("x", sourceFile), createImportSpecifier(undefined, createIdentifier("a")));
+            })
+        }
+        {
+            const text = `
+import {
+    x0,
+    x
+} from "bar"`;
+            runSingleFileTest("insertNodeInListAfter14", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeInListAfter(sourceFile, findChild("x", sourceFile), createImportSpecifier(createIdentifier("b"), createIdentifier("a")));
+            })
+        }
+        {
+            const text = `
+import {
+    x0,
+    x // this is x
+} from "bar"`;
+            runSingleFileTest("insertNodeInListAfter15", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeInListAfter(sourceFile, findChild("x", sourceFile), createImportSpecifier(createIdentifier("b"), createIdentifier("a")));
+            })
+        }
+        {
+            const text = `
+import {
+    x0,
+    x
+} from "bar"`;
+            runSingleFileTest("insertNodeInListAfter16", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeInListAfter(sourceFile, findChild("x", sourceFile), createImportSpecifier(undefined, createIdentifier("a")));
+            })
+        }
+        {
+            const text = `
+import {
+    x0,
+    x // this is x
+} from "bar"`;
+            runSingleFileTest("insertNodeInListAfter17", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeInListAfter(sourceFile, findChild("x", sourceFile), createImportSpecifier(undefined, createIdentifier("a")));
+            })
+        }
+        {
+            const text = `
+import {
+    x0, x
+} from "bar"`;
+            runSingleFileTest("insertNodeInListAfter18", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeInListAfter(sourceFile, findChild("x", sourceFile), createImportSpecifier(undefined, createIdentifier("a")));
+            })
+        }
+        {
+            const text = `
+class A {
+    x;
+}`;
+            runSingleFileTest("insertNodeAfterMultipleNodes", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                let newNodes = [];
+                for (let i = 0; i < 11 /*error doesn't occur with fewer nodes*/; ++i) {
+                    newNodes.push(
+                        createProperty(undefined, undefined, i + "", undefined, undefined, undefined));
+                }
+                const insertAfter = findChild("x", sourceFile);
+                for (const newNode of newNodes) {
+                    changeTracker.insertNodeAfter(sourceFile, insertAfter, newNode, { suffix: newLineCharacter });
+                }
+            });
+        }
+        {
+            const text = `
+class A {
+    x
+}
+`;
+            runSingleFileTest("insertNodeAfterInClass1", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeAfter(sourceFile, findChild("x", sourceFile), createProperty(undefined, undefined, "a", undefined, createKeywordTypeNode(SyntaxKind.BooleanKeyword), undefined), { suffix: newLineCharacter });
+            });
+        }
+        {
+            const text = `
+class A {
+    x;
+}
+`;
+            runSingleFileTest("insertNodeAfterInClass2", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.insertNodeAfter(sourceFile, findChild("x", sourceFile), createProperty(undefined, undefined, "a", undefined, createKeywordTypeNode(SyntaxKind.BooleanKeyword), undefined), { suffix: newLineCharacter });
+            });
+        }
+        {
+            const text = `
+class A {
+    x;
+    y = 1;
+}
+`;
+            runSingleFileTest("deleteNodeAfterInClass1", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNode(sourceFile, findChild("x", sourceFile));
+            });
+        }
+        {
+            const text = `
+class A {
+    x
+    y = 1;
+}
+`;
+            runSingleFileTest("deleteNodeAfterInClass2", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                changeTracker.deleteNode(sourceFile, findChild("x", sourceFile));
+            });
+        }
+        {
+            const text = `
+class A {
+    x = foo
+}
+`
+            runSingleFileTest("insertNodeInClassAfterNodeWithoutSeparator1", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                const newNode = createProperty(
+                    /*decorators*/ undefined,
+                    /*modifiers*/ undefined,
+                    createComputedPropertyName(createLiteral(1)),
+                    /*questionToken*/ undefined,
+                    createKeywordTypeNode(SyntaxKind.AnyKeyword),
+                    /*initializer*/ undefined);
+                changeTracker.insertNodeAfter(sourceFile, findChild("x", sourceFile), newNode, { suffix: newLineCharacter });
+            });
+        }
+        {
+            const text = `
+class A {
+    x() {
+    }
+}
+`
+            runSingleFileTest("insertNodeInClassAfterNodeWithoutSeparator2", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                const newNode = createProperty(
+                    /*decorators*/ undefined,
+                    /*modifiers*/ undefined,
+                    createComputedPropertyName(createLiteral(1)),
+                    /*questionToken*/ undefined,
+                    createKeywordTypeNode(SyntaxKind.AnyKeyword),
+                    /*initializer*/ undefined);
+                changeTracker.insertNodeAfter(sourceFile, findChild("x", sourceFile), newNode, { suffix: newLineCharacter });
+            });
+        }
+        {
+            const text = `
+interface A {
+    x
+}
+`
+            runSingleFileTest("insertNodeInInterfaceAfterNodeWithoutSeparator1", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                const newNode = createProperty(
+                    /*decorators*/ undefined,
+                    /*modifiers*/ undefined,
+                    createComputedPropertyName(createLiteral(1)),
+                    /*questionToken*/ undefined,
+                    createKeywordTypeNode(SyntaxKind.AnyKeyword),
+                    /*initializer*/ undefined);
+                changeTracker.insertNodeAfter(sourceFile, findChild("x", sourceFile), newNode, { suffix: newLineCharacter });
+            });
+        }
+        {
+            const text = `
+interface A {
+    x()
+}
+`
+            runSingleFileTest("insertNodeInInterfaceAfterNodeWithoutSeparator2", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                const newNode = createProperty(
+                    /*decorators*/ undefined,
+                    /*modifiers*/ undefined,
+                    createComputedPropertyName(createLiteral(1)),
+                    /*questionToken*/ undefined,
+                    createKeywordTypeNode(SyntaxKind.AnyKeyword),
+                    /*initializer*/ undefined);
+                changeTracker.insertNodeAfter(sourceFile, findChild("x", sourceFile), newNode, { suffix: newLineCharacter });
+            });
+        }
+        {
+            const text = `
+let x = foo
+`
+            runSingleFileTest("insertNodeInStatementListAfterNodeWithoutSeparator1", noop, text, /*validateNodes*/ false, (sourceFile, changeTracker) => {
+                const newNode = createStatement(createParen(createLiteral(1)));
+                changeTracker.insertNodeAfter(sourceFile, findVariableStatementContaining("x", sourceFile), newNode, { suffix: newLineCharacter });
+            });
+        }
+    });
+}
\ No newline at end of file
diff --git a/src/lib/dom.iterable.d.ts b/src/lib/dom.iterable.d.ts
index 7f653dc8e0c..e4da7a62763 100644
--- a/src/lib/dom.iterable.d.ts
+++ b/src/lib/dom.iterable.d.ts
@@ -5,9 +5,53 @@ interface DOMTokenList {
 }
 
 interface NodeList {
+
+
+    /** 
+    * Returns an array of key, value pairs for every entry in the list
+    */
+    entries(): IterableIterator<[number, Node]>;
+    /**
+      * Performs the specified action for each node in an list.
+      * @param callbackfn  A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the list.
+      * @param thisArg  An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
+      */
+    forEach(callbackfn: (value: Node, index: number, listObj: NodeList) => void, thisArg?: any): void;
+    /** 
+      * Returns an list of keys in the list
+      */
+    keys(): IterableIterator<number>;
+
+    /** 
+      * Returns an list of values in the list
+      */
+    values(): IterableIterator<Node>;
+   
+
     [Symbol.iterator](): IterableIterator<Node>
 }
 
 interface NodeListOf<TNode extends Node> {
+
+    /** 
+    * Returns an array of key, value pairs for every entry in the list
+    */
+    entries(): IterableIterator<[number, TNode]>;
+
+    /**
+      * Performs the specified action for each node in an list.
+      * @param callbackfn  A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the list.
+      * @param thisArg  An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
+      */
+    forEach(callbackfn: (value: TNode, index: number, listObj: NodeListOf<TNode>) => void, thisArg?: any): void;
+    /** 
+      * Returns an list of keys in the list
+      */
+    keys(): IterableIterator<number>;
+    /** 
+      * Returns an list of values in the list
+      */
+    values(): IterableIterator<TNode>;   
+     
     [Symbol.iterator](): IterableIterator<TNode>
 }
diff --git a/src/lib/es2015.core.d.ts b/src/lib/es2015.core.d.ts
index eb23ce7901f..88f70758e5a 100644
--- a/src/lib/es2015.core.d.ts
+++ b/src/lib/es2015.core.d.ts
@@ -10,7 +10,9 @@ interface Array<T> {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    find(predicate: (value: T, index: number, obj: Array<T>) => boolean, thisArg?: any): T | undefined;
+    find(predicate: (this: undefined, value: T, index: number, obj: Array<T>) => boolean): T | undefined;
+    find(predicate: (this: undefined, value: T, index: number, obj: Array<T>) => boolean, thisArg: undefined): T | undefined;
+    find<Z>(predicate: (this: Z, value: T, index: number, obj: Array<T>) => boolean, thisArg: Z): T | undefined;
 
     /**
       * Returns the index of the first element in the array where predicate is true, and -1
@@ -21,7 +23,9 @@ interface Array<T> {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    findIndex(predicate: (value: T, index: number, obj: Array<T>) => boolean, thisArg?: any): number;
+    findIndex(predicate: (this: undefined, value: T, index: number, obj: Array<T>) => boolean): number;
+    findIndex(predicate: (this: undefined, value: T, index: number, obj: Array<T>) => boolean, thisArg: undefined): number;
+    findIndex<Z>(predicate: (this: Z, value: T, index: number, obj: Array<T>) => boolean, thisArg: Z): number;
 
     /**
       * Returns the this object after filling the section identified by start and end with value
@@ -52,7 +56,9 @@ interface ArrayConstructor {
       * @param mapfn A mapping function to call on every element of the array.
       * @param thisArg Value of 'this' used to invoke the mapfn.
       */
-    from<T, U>(arrayLike: ArrayLike<T>, mapfn: (v: T, k: number) => U, thisArg?: any): Array<U>;
+    from<T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U): Array<U>;
+    from<T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): Array<U>;
+    from<Z, T, U>(arrayLike: ArrayLike<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): Array<U>;
 
 
     /**
@@ -357,7 +363,9 @@ interface ReadonlyArray<T> {
     * @param thisArg If provided, it will be used as the this value for each invocation of
     * predicate. If it is not provided, undefined is used instead.
     */
-  find(predicate: (value: T, index: number, obj: ReadonlyArray<T>) => boolean, thisArg?: any): T | undefined;
+  find(predicate: (this: undefined, value: T, index: number, obj: ReadonlyArray<T>) => boolean): T | undefined;
+  find(predicate: (this: undefined, value: T, index: number, obj: ReadonlyArray<T>) => boolean, thisArg: undefined): T | undefined;
+  find<Z>(predicate: (this: Z, value: T, index: number, obj: ReadonlyArray<T>) => boolean, thisArg: Z): T | undefined;
 
   /**
     * Returns the index of the first element in the array where predicate is true, and -1
@@ -368,7 +376,9 @@ interface ReadonlyArray<T> {
     * @param thisArg If provided, it will be used as the this value for each invocation of
     * predicate. If it is not provided, undefined is used instead.
     */
-  findIndex(predicate: (value: T, index: number, obj: Array<T>) => boolean, thisArg?: any): number;
+  findIndex(predicate: (this: undefined, value: T, index: number, obj: Array<T>) => boolean): number;
+  findIndex(predicate: (this: undefined, value: T, index: number, obj: Array<T>) => boolean, thisArg: undefined): number;
+  findIndex<Z>(predicate: (this: Z, value: T, index: number, obj: Array<T>) => boolean, thisArg: Z): number;
 }
 
 interface RegExp {
diff --git a/src/lib/es2015.iterable.d.ts b/src/lib/es2015.iterable.d.ts
index 247017bae7d..fe56c6e8bfb 100644
--- a/src/lib/es2015.iterable.d.ts
+++ b/src/lib/es2015.iterable.d.ts
@@ -54,7 +54,9 @@ interface ArrayConstructor {
       * @param mapfn A mapping function to call on every element of the array.
       * @param thisArg Value of 'this' used to invoke the mapfn.
       */
-    from<T, U>(iterable: Iterable<T>, mapfn: (v: T, k: number) => U, thisArg?: any): Array<U>;
+    from<T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U): Array<U>;
+    from<T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): Array<U>;
+    from<Z, T, U>(iterable: Iterable<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): Array<U>;
 
     /**
       * Creates an array from an iterable object.
@@ -180,7 +182,11 @@ interface Int8ArrayConstructor {
       * @param mapfn A mapping function to call on every element of the array.
       * @param thisArg Value of 'this' used to invoke the mapfn.
       */
-    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int8Array;
+    from(arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int8Array;
+    from(arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int8Array;
+    from<Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int8Array;
+
+    from(arrayLike: Iterable<number>): Int8Array;
 }
 
 /**
@@ -212,7 +218,11 @@ interface Uint8ArrayConstructor {
       * @param mapfn A mapping function to call on every element of the array.
       * @param thisArg Value of 'this' used to invoke the mapfn.
       */
-    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8Array;
+    from(arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8Array;
+    from(arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8Array;
+    from<Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8Array;
+
+    from(arrayLike: Iterable<number>): Uint8Array;
 }
 
 /**
@@ -247,7 +257,11 @@ interface Uint8ClampedArrayConstructor {
       * @param mapfn A mapping function to call on every element of the array.
       * @param thisArg Value of 'this' used to invoke the mapfn.
       */
-    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8ClampedArray;
+    from(arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8ClampedArray;
+    from(arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8ClampedArray;
+    from<Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8ClampedArray;
+
+    from(arrayLike: Iterable<number>): Uint8ClampedArray;
 }
 
 /**
@@ -281,7 +295,11 @@ interface Int16ArrayConstructor {
       * @param mapfn A mapping function to call on every element of the array.
       * @param thisArg Value of 'this' used to invoke the mapfn.
       */
-    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int16Array;
+    from(arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int16Array;
+    from(arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int16Array;
+    from<Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int16Array;
+
+    from(arrayLike: Iterable<number>): Int16Array;
 }
 
 /**
@@ -313,7 +331,11 @@ interface Uint16ArrayConstructor {
       * @param mapfn A mapping function to call on every element of the array.
       * @param thisArg Value of 'this' used to invoke the mapfn.
       */
-    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint16Array;
+    from(arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint16Array;
+    from(arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint16Array;
+    from<Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint16Array;
+
+    from(arrayLike: Iterable<number>): Uint16Array;
 }
 
 /**
@@ -345,7 +367,11 @@ interface Int32ArrayConstructor {
       * @param mapfn A mapping function to call on every element of the array.
       * @param thisArg Value of 'this' used to invoke the mapfn.
       */
-    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int32Array;
+    from(arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int32Array;
+    from(arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int32Array;
+    from<Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int32Array;
+
+    from(arrayLike: Iterable<number>): Int32Array;
 }
 
 /**
@@ -377,7 +403,11 @@ interface Uint32ArrayConstructor {
       * @param mapfn A mapping function to call on every element of the array.
       * @param thisArg Value of 'this' used to invoke the mapfn.
       */
-    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint32Array;
+    from(arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint32Array;
+    from(arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint32Array;
+    from<Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint32Array;
+
+    from(arrayLike: Iterable<number>): Uint32Array;
 }
 
 /**
@@ -409,7 +439,11 @@ interface Float32ArrayConstructor {
       * @param mapfn A mapping function to call on every element of the array.
       * @param thisArg Value of 'this' used to invoke the mapfn.
       */
-    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float32Array;
+    from(arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Float32Array;
+    from(arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float32Array;
+    from<Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float32Array;
+
+    from(arrayLike: Iterable<number>): Float32Array;
 }
 
 /**
@@ -441,5 +475,9 @@ interface Float64ArrayConstructor {
       * @param mapfn A mapping function to call on every element of the array.
       * @param thisArg Value of 'this' used to invoke the mapfn.
       */
-    from(arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float64Array;
+    from(arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Float64Array;
+    from(arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float64Array;
+    from<Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float64Array;
+
+    from(arrayLike: Iterable<number>): Float64Array;
 }
diff --git a/src/lib/es5.d.ts b/src/lib/es5.d.ts
index 04743f7d77f..7d3a2179a38 100644
--- a/src/lib/es5.d.ts
+++ b/src/lib/es5.d.ts
@@ -325,53 +325,27 @@ interface String {
       * Matches a string with a regular expression, and returns an array containing the results of that search.
       * @param regexp A variable name or string literal containing the regular expression pattern and flags.
       */
-    match(regexp: string): RegExpMatchArray | null;
-
-    /**
-      * Matches a string with a regular expression, and returns an array containing the results of that search.
-      * @param regexp A regular expression object that contains the regular expression pattern and applicable flags.
-      */
-    match(regexp: RegExp): RegExpMatchArray | null;
+    match(regexp: string | RegExp): RegExpMatchArray | null;
 
     /**
       * Replaces text in a string, using a regular expression or search string.
       * @param searchValue A string to search for.
       * @param replaceValue A string containing the text to replace for every successful match of searchValue in this string.
       */
-    replace(searchValue: string, replaceValue: string): string;
+    replace(searchValue: string | RegExp, replaceValue: string): string;
 
     /**
       * Replaces text in a string, using a regular expression or search string.
       * @param searchValue A string to search for.
       * @param replacer A function that returns the replacement text.
       */
-    replace(searchValue: string, replacer: (substring: string, ...args: any[]) => string): string;
-
-    /**
-      * Replaces text in a string, using a regular expression or search string.
-      * @param searchValue A Regular Expression object containing the regular expression pattern and applicable flags.
-      * @param replaceValue A string containing the text to replace for every successful match of searchValue in this string.
-      */
-    replace(searchValue: RegExp, replaceValue: string): string;
-
-    /**
-      * Replaces text in a string, using a regular expression or search string.
-      * @param searchValue A Regular Expression object containing the regular expression pattern and applicable flags
-      * @param replacer A function that returns the replacement text.
-      */
-    replace(searchValue: RegExp, replacer: (substring: string, ...args: any[]) => string): string;
+    replace(searchValue: string | RegExp, replacer: (substring: string, ...args: any[]) => string): string;
 
     /**
       * Finds the first substring match in a regular expression search.
       * @param regexp The regular expression pattern and applicable flags.
       */
-    search(regexp: string): number;
-
-    /**
-      * Finds the first substring match in a regular expression search.
-      * @param regexp The regular expression pattern and applicable flags.
-      */
-    search(regexp: RegExp): number;
+    search(regexp: string | RegExp): number;
 
     /**
       * Returns a section of a string.
@@ -386,14 +360,7 @@ interface String {
       * @param separator A string that identifies character or characters to use in separating the string. If omitted, a single-element array containing the entire string is returned.
       * @param limit A value used to limit the number of elements returned in the array.
       */
-    split(separator: string, limit?: number): string[];
-
-    /**
-      * Split a string into substrings using the specified separator and return them as an array.
-      * @param separator A Regular Express that identifies character or characters to use in separating the string. If omitted, a single-element array containing the entire string is returned.
-      * @param limit A value used to limit the number of elements returned in the array.
-      */
-    split(separator: RegExp, limit?: number): string[];
+    split(separator: string | RegExp, limit?: number): string[];
 
     /**
       * Returns the substring at the specified location within a String object.
@@ -861,9 +828,9 @@ interface RegExp {
 }
 
 interface RegExpConstructor {
-    new (pattern: RegExp): RegExp;
+    new (pattern: RegExp | string): RegExp;
     new (pattern: string, flags?: string): RegExp;
-    (pattern: RegExp): RegExp;
+    (pattern: RegExp | string): RegExp;
     (pattern: string, flags?: string): RegExp;
     readonly prototype: RegExp;
 
@@ -1050,37 +1017,49 @@ interface ReadonlyArray<T> {
       * @param callbackfn A function that accepts up to three arguments. The every method calls the callbackfn function for each element in array1 until the callbackfn returns false, or until the end of the array.
       * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
       */
-    every(callbackfn: (value: T, index: number, array: ReadonlyArray<T>) => boolean, thisArg?: any): boolean;
+    every(callbackfn: (this: undefined, value: T, index: number, array: ReadonlyArray<T>) => boolean): boolean;
+    every(callbackfn: (this: undefined, value: T, index: number, array: ReadonlyArray<T>) => boolean, thisArg: undefined): boolean;
+    every<Z>(callbackfn: (this: Z, value: T, index: number, array: ReadonlyArray<T>) => boolean, thisArg: Z): boolean;
     /**
       * Determines whether the specified callback function returns true for any element of an array.
       * @param callbackfn A function that accepts up to three arguments. The some method calls the callbackfn function for each element in array1 until the callbackfn returns true, or until the end of the array.
       * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
       */
-    some(callbackfn: (value: T, index: number, array: ReadonlyArray<T>) => boolean, thisArg?: any): boolean;
+    some(callbackfn: (this: undefined, value: T, index: number, array: ReadonlyArray<T>) => boolean): boolean;
+    some(callbackfn: (this: undefined, value: T, index: number, array: ReadonlyArray<T>) => boolean, thisArg: undefined): boolean;
+    some<Z>(callbackfn: (this: Z, value: T, index: number, array: ReadonlyArray<T>) => boolean, thisArg: Z): boolean;
     /**
       * Performs the specified action for each element in an array.
       * @param callbackfn  A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the array.
       * @param thisArg  An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
       */
-    forEach(callbackfn: (value: T, index: number, array: ReadonlyArray<T>) => void, thisArg?: any): void;
+    forEach(callbackfn: (this: undefined, value: T, index: number, array: ReadonlyArray<T>) => void): void;
+    forEach(callbackfn: (this: undefined, value: T, index: number, array: ReadonlyArray<T>) => void, thisArg: undefined): void;
+    forEach<Z>(callbackfn: (this: Z, value: T, index: number, array: ReadonlyArray<T>) => void, thisArg: Z): void;
     /**
       * Calls a defined callback function on each element of an array, and returns an array that contains the results.
       * @param callbackfn A function that accepts up to three arguments. The map method calls the callbackfn function one time for each element in the array.
       * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
       */
-    map<U>(callbackfn: (value: T, index: number, array: ReadonlyArray<T>) => U, thisArg?: any): U[];
+    map<U>(callbackfn: (this: undefined, value: T, index: number, array: ReadonlyArray<T>) => U): U[];
+    map<U>(callbackfn: (this: undefined, value: T, index: number, array: ReadonlyArray<T>) => U, thisArg: undefined): U[];
+    map<Z, U>(callbackfn: (this: Z, value: T, index: number, array: ReadonlyArray<T>) => U, thisArg: Z): U[];
     /**
      * Returns the elements of an array that meet the condition specified in a callback function.
      * @param callbackfn A function that accepts up to three arguments. The filter method calls the callbackfn function one time for each element in the array.
      * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
      */
-    filter<S extends T>(callbackfn: (value: T, index: number, array: ReadonlyArray<T>) => value is S, thisArg?: any): S[];
+    filter<S extends T>(callbackfn: (this: undefined, value: T, index: number, array: ReadonlyArray<T>) => value is S): S[];
+    filter<S extends T>(callbackfn: (this: undefined, value: T, index: number, array: ReadonlyArray<T>) => value is S, thisArg: undefined): S[];
+    filter<Z, S extends T>(callbackfn: (this: Z, value: T, index: number, array: ReadonlyArray<T>) => value is S, thisArg: Z): S[];
     /**
       * Returns the elements of an array that meet the condition specified in a callback function.
       * @param callbackfn A function that accepts up to three arguments. The filter method calls the callbackfn function one time for each element in the array.
       * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
       */
-    filter(callbackfn: (value: T, index: number, array: ReadonlyArray<T>) => any, thisArg?: any): T[];
+    filter(callbackfn: (this: undefined, value: T, index: number, array: ReadonlyArray<T>) => any): T[];
+    filter(callbackfn: (this: undefined, value: T, index: number, array: ReadonlyArray<T>) => any, thisArg: undefined): T[];
+    filter<Z>(callbackfn: (this: Z, value: T, index: number, array: ReadonlyArray<T>) => any, thisArg: Z): T[];
     /**
       * Calls the specified callback function for all the elements in an array. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
       * @param callbackfn A function that accepts up to four arguments. The reduce method calls the callbackfn function one time for each element in the array.
@@ -1197,55 +1176,73 @@ interface Array<T> {
       * @param callbackfn A function that accepts up to three arguments. The every method calls the callbackfn function for each element in array1 until the callbackfn returns false, or until the end of the array.
       * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
       */
-    every(callbackfn: (value: T, index: number, array: T[]) => boolean, thisArg?: any): boolean;
+    every(callbackfn: (this: undefined, value: T, index: number, array: T[]) => boolean): boolean;
+    every(callbackfn: (this: undefined, value: T, index: number, array: T[]) => boolean, thisArg: undefined): boolean;
+    every<Z>(callbackfn: (this: Z, value: T, index: number, array: T[]) => boolean, thisArg: Z): boolean;
     /**
       * Determines whether the specified callback function returns true for any element of an array.
       * @param callbackfn A function that accepts up to three arguments. The some method calls the callbackfn function for each element in array1 until the callbackfn returns true, or until the end of the array.
       * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
       */
-    some(callbackfn: (value: T, index: number, array: T[]) => boolean, thisArg?: any): boolean;
+    some(callbackfn: (this: undefined, value: T, index: number, array: T[]) => boolean): boolean;
+    some(callbackfn: (this: undefined, value: T, index: number, array: T[]) => boolean, thisArg: undefined): boolean;
+    some<Z>(callbackfn: (this: Z, value: T, index: number, array: T[]) => boolean, thisArg: Z): boolean;
     /**
       * Performs the specified action for each element in an array.
       * @param callbackfn  A function that accepts up to three arguments. forEach calls the callbackfn function one time for each element in the array.
       * @param thisArg  An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
       */
-    forEach(callbackfn: (value: T, index: number, array: T[]) => void, thisArg?: any): void;
+    forEach(callbackfn: (this: undefined, value: T, index: number, array: T[]) => void): void;
+    forEach(callbackfn: (this: undefined, value: T, index: number, array: T[]) => void, thisArg: undefined): void;
+    forEach<Z>(callbackfn: (this: Z, value: T, index: number, array: T[]) => void, thisArg: Z): void;
     /**
       * Calls a defined callback function on each element of an array, and returns an array that contains the results.
       * @param callbackfn A function that accepts up to three arguments. The map method calls the callbackfn function one time for each element in the array.
       * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
       */
-    map<U>(this: [T, T, T, T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U, U, U, U];
+    map<U>(this: [T, T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U, U, U, U];
+    map<U>(this: [T, T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U, U, U, U];
+    map<Z, U>(this: [T, T, T, T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U, U, U, U];
     /**
       * Calls a defined callback function on each element of an array, and returns an array that contains the results.
       * @param callbackfn A function that accepts up to three arguments. The map method calls the callbackfn function one time for each element in the array.
       * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
       */
-    map<U>(this: [T, T, T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U, U, U];
+    map<U>(this: [T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U, U, U];
+    map<U>(this: [T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U, U, U];
+    map<Z, U>(this: [T, T, T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U, U, U];
     /**
       * Calls a defined callback function on each element of an array, and returns an array that contains the results.
       * @param callbackfn A function that accepts up to three arguments. The map method calls the callbackfn function one time for each element in the array.
       * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
       */
-    map<U>(this: [T, T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U, U];
+    map<U>(this: [T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U, U];
+    map<U>(this: [T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U, U];
+    map<Z, U>(this: [T, T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U, U];
     /**
       * Calls a defined callback function on each element of an array, and returns an array that contains the results.
       * @param callbackfn A function that accepts up to three arguments. The map method calls the callbackfn function one time for each element in the array.
       * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
       */
-    map<U>(this: [T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U];
+    map<U>(this: [T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U];
+    map<U>(this: [T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U];
+    map<Z, U>(this: [T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U];
     /**
       * Calls a defined callback function on each element of an array, and returns an array that contains the results.
       * @param callbackfn A function that accepts up to three arguments. The map method calls the callbackfn function one time for each element in the array.
       * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
       */
-    map<U>(callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): U[];
+    map<U>(callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): U[];
+    map<U>(callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): U[];
+    map<Z, U>(callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): U[];
     /**
       * Returns the elements of an array that meet the condition specified in a callback function.
       * @param callbackfn A function that accepts up to three arguments. The filter method calls the callbackfn function one time for each element in the array.
       * @param thisArg An object to which the this keyword can refer in the callbackfn function. If thisArg is omitted, undefined is used as the this value.
       */
-    filter(callbackfn: (value: T, index: number, array: T[]) => any, thisArg?: any): T[];
+    filter(callbackfn: (this: undefined, value: T, index: number, array: T[]) => any): T[];
+    filter(callbackfn: (this: undefined, value: T, index: number, array: T[]) => any, thisArg: undefined): T[];
+    filter<Z>(callbackfn: (this: Z, value: T, index: number, array: T[]) => any, thisArg: Z): T[];
     /**
       * Calls the specified callback function for all the elements in an array. The return value of the callback function is the accumulated result, and is provided as an argument in the next call to the callback function.
       * @param callbackfn A function that accepts up to four arguments. The reduce method calls the callbackfn function one time for each element in the array.
@@ -1590,7 +1587,9 @@ interface Int8Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    every(callbackfn: (value: number, index: number, array: Int8Array) => boolean, thisArg?: any): boolean;
+    every(callbackfn: (this: undefined, value: number, index: number, array: Int8Array) => boolean): boolean;
+    every(callbackfn: (this: undefined, value: number, index: number, array: Int8Array) => boolean, thisArg: undefined): boolean;
+    every<Z>(callbackfn: (this: Z, value: number, index: number, array: Int8Array) => boolean, thisArg: Z): boolean;
 
     /**
         * Returns the this object after filling the section identified by start and end with value
@@ -1609,7 +1608,9 @@ interface Int8Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    filter(callbackfn: (value: number, index: number, array: Int8Array) => any, thisArg?: any): Int8Array;
+    filter(callbackfn: (this: undefined, value: number, index: number, array: Int8Array) => any): Int8Array;
+    filter(callbackfn: (this: undefined, value: number, index: number, array: Int8Array) => any, thisArg: undefined): Int8Array;
+    filter<Z>(callbackfn: (this: Z, value: number, index: number, array: Int8Array) => any, thisArg: Z): Int8Array;
 
     /**
       * Returns the value of the first element in the array where predicate is true, and undefined
@@ -1620,7 +1621,9 @@ interface Int8Array {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    find(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number | undefined;
+    find(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean): number | undefined;
+    find(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean, thisArg: undefined): number | undefined;
+    find<Z>(predicate: (this: Z, value: number, index: number, obj: Array<number>) => boolean, thisArg: Z): number | undefined;
 
     /**
       * Returns the index of the first element in the array where predicate is true, and -1
@@ -1631,7 +1634,9 @@ interface Int8Array {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    findIndex(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number;
+    findIndex(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean): number;
+    findIndex(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean, thisArg: undefined): number;
+    findIndex<Z>(predicate: (this: Z, value: number, index: number, obj: Array<number>) => boolean, thisArg: Z): number;
 
     /**
       * Performs the specified action for each element in an array.
@@ -1640,7 +1645,9 @@ interface Int8Array {
       * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    forEach(callbackfn: (value: number, index: number, array: Int8Array) => void, thisArg?: any): void;
+    forEach(callbackfn: (this: undefined, value: number, index: number, array: Int8Array) => void): void;
+    forEach(callbackfn: (this: undefined, value: number, index: number, array: Int8Array) => void, thisArg: undefined): void;
+    forEach<Z>(callbackfn: (this: Z, value: number, index: number, array: Int8Array) => void, thisArg: Z): void;
 
     /**
       * Returns the index of the first occurrence of a value in an array.
@@ -1678,7 +1685,9 @@ interface Int8Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    map(callbackfn: (value: number, index: number, array: Int8Array) => number, thisArg?: any): Int8Array;
+    map(callbackfn: (this: undefined, value: number, index: number, array: Int8Array) => number): Int8Array;
+    map(callbackfn: (this: undefined, value: number, index: number, array: Int8Array) => number, thisArg: undefined): Int8Array;
+    map<Z>(callbackfn: (this: Z, value: number, index: number, array: Int8Array) => number, thisArg: Z): Int8Array;
 
     /**
       * Calls the specified callback function for all the elements in an array. The return value of
@@ -1762,7 +1771,9 @@ interface Int8Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    some(callbackfn: (value: number, index: number, array: Int8Array) => boolean, thisArg?: any): boolean;
+    some(callbackfn: (this: undefined, value: number, index: number, array: Int8Array) => boolean): boolean;
+    some(callbackfn: (this: undefined, value: number, index: number, array: Int8Array) => boolean, thisArg: undefined): boolean;
+    some<Z>(callbackfn: (this: Z, value: number, index: number, array: Int8Array) => boolean, thisArg: Z): boolean;
 
     /**
       * Sorts an array.
@@ -1814,7 +1825,11 @@ interface Int8ArrayConstructor {
       * @param mapfn A mapping function to call on every element of the array.
       * @param thisArg Value of 'this' used to invoke the mapfn.
       */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int8Array;
+    from(arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int8Array;
+    from(arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int8Array;
+    from<Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int8Array;
+
+    from(arrayLike: ArrayLike<number>): Int8Array;
 
 }
 declare const Int8Array: Int8ArrayConstructor;
@@ -1863,7 +1878,9 @@ interface Uint8Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    every(callbackfn: (value: number, index: number, array: Uint8Array) => boolean, thisArg?: any): boolean;
+    every(callbackfn: (this: undefined, value: number, index: number, array: Uint8Array) => boolean): boolean;
+    every(callbackfn: (this: undefined, value: number, index: number, array: Uint8Array) => boolean, thisArg: undefined): boolean;
+    every<Z>(callbackfn: (this: Z, value: number, index: number, array: Uint8Array) => boolean, thisArg: Z): boolean;
 
     /**
         * Returns the this object after filling the section identified by start and end with value
@@ -1882,7 +1899,9 @@ interface Uint8Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    filter(callbackfn: (value: number, index: number, array: Uint8Array) => any, thisArg?: any): Uint8Array;
+    filter(callbackfn: (this: undefined, value: number, index: number, array: Uint8Array) => any): Uint8Array;
+    filter(callbackfn: (this: undefined, value: number, index: number, array: Uint8Array) => any, thisArg: undefined): Uint8Array;
+    filter<Z>(callbackfn: (this: Z, value: number, index: number, array: Uint8Array) => any, thisArg: Z): Uint8Array;
 
     /**
       * Returns the value of the first element in the array where predicate is true, and undefined
@@ -1893,7 +1912,9 @@ interface Uint8Array {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    find(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number | undefined;
+    find(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean): number | undefined;
+    find(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean, thisArg: undefined): number | undefined;
+    find<Z>(predicate: (this: Z, value: number, index: number, obj: Array<number>) => boolean, thisArg: Z): number | undefined;
 
     /**
       * Returns the index of the first element in the array where predicate is true, and -1
@@ -1904,7 +1925,9 @@ interface Uint8Array {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    findIndex(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number;
+    findIndex(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean): number;
+    findIndex(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean, thisArg: undefined): number;
+    findIndex<Z>(predicate: (this: Z, value: number, index: number, obj: Array<number>) => boolean, thisArg: Z): number;
 
     /**
       * Performs the specified action for each element in an array.
@@ -1913,7 +1936,9 @@ interface Uint8Array {
       * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    forEach(callbackfn: (value: number, index: number, array: Uint8Array) => void, thisArg?: any): void;
+    forEach(callbackfn: (this: undefined, value: number, index: number, array: Uint8Array) => void): void;
+    forEach(callbackfn: (this: undefined, value: number, index: number, array: Uint8Array) => void, thisArg: undefined): void;
+    forEach<Z>(callbackfn: (this: Z, value: number, index: number, array: Uint8Array) => void, thisArg: Z): void;
 
     /**
       * Returns the index of the first occurrence of a value in an array.
@@ -1951,7 +1976,9 @@ interface Uint8Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    map(callbackfn: (value: number, index: number, array: Uint8Array) => number, thisArg?: any): Uint8Array;
+    map(callbackfn: (this: undefined, value: number, index: number, array: Uint8Array) => number): Uint8Array;
+    map(callbackfn: (this: undefined, value: number, index: number, array: Uint8Array) => number, thisArg: undefined): Uint8Array;
+    map<Z>(callbackfn: (this: Z, value: number, index: number, array: Uint8Array) => number, thisArg: Z): Uint8Array;
 
     /**
       * Calls the specified callback function for all the elements in an array. The return value of
@@ -2035,7 +2062,9 @@ interface Uint8Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    some(callbackfn: (value: number, index: number, array: Uint8Array) => boolean, thisArg?: any): boolean;
+    some(callbackfn: (this: undefined, value: number, index: number, array: Uint8Array) => boolean): boolean;
+    some(callbackfn: (this: undefined, value: number, index: number, array: Uint8Array) => boolean, thisArg: undefined): boolean;
+    some<Z>(callbackfn: (this: Z, value: number, index: number, array: Uint8Array) => boolean, thisArg: Z): boolean;
 
     /**
       * Sorts an array.
@@ -2088,7 +2117,11 @@ interface Uint8ArrayConstructor {
       * @param mapfn A mapping function to call on every element of the array.
       * @param thisArg Value of 'this' used to invoke the mapfn.
       */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8Array;
+    from(arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8Array;
+    from(arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8Array;
+    from<Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8Array;
+
+    from(arrayLike: ArrayLike<number>): Uint8Array;
 
 }
 declare const Uint8Array: Uint8ArrayConstructor;
@@ -2137,7 +2170,9 @@ interface Uint8ClampedArray {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    every(callbackfn: (value: number, index: number, array: Uint8ClampedArray) => boolean, thisArg?: any): boolean;
+    every(callbackfn: (this: undefined, value: number, index: number, array: Uint8ClampedArray) => boolean): boolean;
+    every(callbackfn: (this: undefined, value: number, index: number, array: Uint8ClampedArray) => boolean, thisArg: undefined): boolean;
+    every<Z>(callbackfn: (this: Z, value: number, index: number, array: Uint8ClampedArray) => boolean, thisArg: Z): boolean;
 
     /**
         * Returns the this object after filling the section identified by start and end with value
@@ -2156,7 +2191,9 @@ interface Uint8ClampedArray {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    filter(callbackfn: (value: number, index: number, array: Uint8ClampedArray) => any, thisArg?: any): Uint8ClampedArray;
+    filter(callbackfn: (this: undefined, value: number, index: number, array: Uint8ClampedArray) => any): Uint8ClampedArray;
+    filter(callbackfn: (this: undefined, value: number, index: number, array: Uint8ClampedArray) => any, thisArg: undefined): Uint8ClampedArray;
+    filter<Z>(callbackfn: (this: Z, value: number, index: number, array: Uint8ClampedArray) => any, thisArg: Z): Uint8ClampedArray;
 
     /**
       * Returns the value of the first element in the array where predicate is true, and undefined
@@ -2167,7 +2204,9 @@ interface Uint8ClampedArray {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    find(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number | undefined;
+    find(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean): number | undefined;
+    find(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean, thisArg: undefined): number | undefined;
+    find<Z>(predicate: (this: Z, value: number, index: number, obj: Array<number>) => boolean, thisArg: Z): number | undefined;
 
     /**
       * Returns the index of the first element in the array where predicate is true, and -1
@@ -2178,7 +2217,9 @@ interface Uint8ClampedArray {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    findIndex(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number;
+    findIndex(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean): number;
+    findIndex(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean, thisArg: undefined): number;
+    findIndex<Z>(predicate: (this: Z, value: number, index: number, obj: Array<number>) => boolean, thisArg: Z): number;
 
     /**
       * Performs the specified action for each element in an array.
@@ -2187,7 +2228,9 @@ interface Uint8ClampedArray {
       * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    forEach(callbackfn: (value: number, index: number, array: Uint8ClampedArray) => void, thisArg?: any): void;
+    forEach(callbackfn: (this: undefined, value: number, index: number, array: Uint8ClampedArray) => void): void;
+    forEach(callbackfn: (this: undefined, value: number, index: number, array: Uint8ClampedArray) => void, thisArg: undefined): void;
+    forEach<Z>(callbackfn: (this: Z, value: number, index: number, array: Uint8ClampedArray) => void, thisArg: Z): void;
 
     /**
       * Returns the index of the first occurrence of a value in an array.
@@ -2225,7 +2268,9 @@ interface Uint8ClampedArray {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    map(callbackfn: (value: number, index: number, array: Uint8ClampedArray) => number, thisArg?: any): Uint8ClampedArray;
+    map(callbackfn: (this: undefined, value: number, index: number, array: Uint8ClampedArray) => number): Uint8ClampedArray;
+    map(callbackfn: (this: undefined, value: number, index: number, array: Uint8ClampedArray) => number, thisArg: undefined): Uint8ClampedArray;
+    map<Z>(callbackfn: (this: Z, value: number, index: number, array: Uint8ClampedArray) => number, thisArg: Z): Uint8ClampedArray;
 
     /**
       * Calls the specified callback function for all the elements in an array. The return value of
@@ -2309,7 +2354,9 @@ interface Uint8ClampedArray {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    some(callbackfn: (value: number, index: number, array: Uint8ClampedArray) => boolean, thisArg?: any): boolean;
+    some(callbackfn: (this: undefined, value: number, index: number, array: Uint8ClampedArray) => boolean): boolean;
+    some(callbackfn: (this: undefined, value: number, index: number, array: Uint8ClampedArray) => boolean, thisArg: undefined): boolean;
+    some<Z>(callbackfn: (this: Z, value: number, index: number, array: Uint8ClampedArray) => boolean, thisArg: Z): boolean;
 
     /**
       * Sorts an array.
@@ -2362,7 +2409,11 @@ interface Uint8ClampedArrayConstructor {
       * @param mapfn A mapping function to call on every element of the array.
       * @param thisArg Value of 'this' used to invoke the mapfn.
       */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8ClampedArray;
+    from(arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8ClampedArray;
+    from(arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8ClampedArray;
+    from<Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8ClampedArray;
+
+    from(arrayLike: ArrayLike<number>): Uint8ClampedArray;
 }
 declare const Uint8ClampedArray: Uint8ClampedArrayConstructor;
 
@@ -2410,7 +2461,9 @@ interface Int16Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    every(callbackfn: (value: number, index: number, array: Int16Array) => boolean, thisArg?: any): boolean;
+    every(callbackfn: (this: undefined, value: number, index: number, array: Int16Array) => boolean): boolean;
+    every(callbackfn: (this: undefined, value: number, index: number, array: Int16Array) => boolean, thisArg: undefined): boolean;
+    every<Z>(callbackfn: (this: Z, value: number, index: number, array: Int16Array) => boolean, thisArg: Z): boolean;
 
     /**
         * Returns the this object after filling the section identified by start and end with value
@@ -2429,7 +2482,9 @@ interface Int16Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    filter(callbackfn: (value: number, index: number, array: Int16Array) => any, thisArg?: any): Int16Array;
+    filter(callbackfn: (this: undefined, value: number, index: number, array: Int16Array) => any): Int16Array;
+    filter(callbackfn: (this: undefined, value: number, index: number, array: Int16Array) => any, thisArg: undefined): Int16Array;
+    filter<Z>(callbackfn: (this: Z, value: number, index: number, array: Int16Array) => any, thisArg: Z): Int16Array;
 
     /**
       * Returns the value of the first element in the array where predicate is true, and undefined
@@ -2440,7 +2495,9 @@ interface Int16Array {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    find(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number | undefined;
+    find(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean): number | undefined;
+    find(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean, thisArg: undefined): number | undefined;
+    find<Z>(predicate: (this: Z, value: number, index: number, obj: Array<number>) => boolean, thisArg: Z): number | undefined;
 
     /**
       * Returns the index of the first element in the array where predicate is true, and -1
@@ -2451,7 +2508,9 @@ interface Int16Array {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    findIndex(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number;
+    findIndex(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean): number;
+    findIndex(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean, thisArg: undefined): number;
+    findIndex<Z>(predicate: (this: Z, value: number, index: number, obj: Array<number>) => boolean, thisArg: Z): number;
 
     /**
       * Performs the specified action for each element in an array.
@@ -2460,7 +2519,9 @@ interface Int16Array {
       * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    forEach(callbackfn: (value: number, index: number, array: Int16Array) => void, thisArg?: any): void;
+    forEach(callbackfn: (this: undefined, value: number, index: number, array: Int16Array) => void): void;
+    forEach(callbackfn: (this: undefined, value: number, index: number, array: Int16Array) => void, thisArg: undefined): void;
+    forEach<Z>(callbackfn: (this: Z, value: number, index: number, array: Int16Array) => void, thisArg: Z): void;
 
     /**
       * Returns the index of the first occurrence of a value in an array.
@@ -2498,7 +2559,9 @@ interface Int16Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    map(callbackfn: (value: number, index: number, array: Int16Array) => number, thisArg?: any): Int16Array;
+    map(callbackfn: (this: undefined, value: number, index: number, array: Int16Array) => number): Int16Array;
+    map(callbackfn: (this: undefined, value: number, index: number, array: Int16Array) => number, thisArg: undefined): Int16Array;
+    map<Z>(callbackfn: (this: Z, value: number, index: number, array: Int16Array) => number, thisArg: Z): Int16Array;
 
     /**
       * Calls the specified callback function for all the elements in an array. The return value of
@@ -2582,7 +2645,9 @@ interface Int16Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    some(callbackfn: (value: number, index: number, array: Int16Array) => boolean, thisArg?: any): boolean;
+    some(callbackfn: (this: undefined, value: number, index: number, array: Int16Array) => boolean): boolean;
+    some(callbackfn: (this: undefined, value: number, index: number, array: Int16Array) => boolean, thisArg: undefined): boolean;
+    some<Z>(callbackfn: (this: Z, value: number, index: number, array: Int16Array) => boolean, thisArg: Z): boolean;
 
     /**
       * Sorts an array.
@@ -2635,7 +2700,11 @@ interface Int16ArrayConstructor {
       * @param mapfn A mapping function to call on every element of the array.
       * @param thisArg Value of 'this' used to invoke the mapfn.
       */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int16Array;
+    from(arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int16Array;
+    from(arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int16Array;
+    from<Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int16Array;
+
+    from(arrayLike: ArrayLike<number>): Int16Array;
 
 }
 declare const Int16Array: Int16ArrayConstructor;
@@ -2684,7 +2753,9 @@ interface Uint16Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    every(callbackfn: (value: number, index: number, array: Uint16Array) => boolean, thisArg?: any): boolean;
+    every(callbackfn: (this: undefined, value: number, index: number, array: Uint16Array) => boolean): boolean;
+    every(callbackfn: (this: undefined, value: number, index: number, array: Uint16Array) => boolean, thisArg: undefined): boolean;
+    every<Z>(callbackfn: (this: Z, value: number, index: number, array: Uint16Array) => boolean, thisArg: Z): boolean;
 
     /**
         * Returns the this object after filling the section identified by start and end with value
@@ -2703,7 +2774,9 @@ interface Uint16Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    filter(callbackfn: (value: number, index: number, array: Uint16Array) => any, thisArg?: any): Uint16Array;
+    filter(callbackfn: (this: undefined, value: number, index: number, array: Uint16Array) => any): Uint16Array;
+    filter(callbackfn: (this: undefined, value: number, index: number, array: Uint16Array) => any, thisArg: undefined): Uint16Array;
+    filter<Z>(callbackfn: (this: Z, value: number, index: number, array: Uint16Array) => any, thisArg: Z): Uint16Array;
 
     /**
       * Returns the value of the first element in the array where predicate is true, and undefined
@@ -2714,7 +2787,9 @@ interface Uint16Array {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    find(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number | undefined;
+    find(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean): number | undefined;
+    find(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean, thisArg: undefined): number | undefined;
+    find<Z>(predicate: (this: Z, value: number, index: number, obj: Array<number>) => boolean, thisArg: Z): number | undefined;
 
     /**
       * Returns the index of the first element in the array where predicate is true, and -1
@@ -2725,7 +2800,9 @@ interface Uint16Array {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    findIndex(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number;
+    findIndex(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean): number;
+    findIndex(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean, thisArg: undefined): number;
+    findIndex<Z>(predicate: (this: Z, value: number, index: number, obj: Array<number>) => boolean, thisArg: Z): number;
 
     /**
       * Performs the specified action for each element in an array.
@@ -2734,7 +2811,9 @@ interface Uint16Array {
       * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    forEach(callbackfn: (value: number, index: number, array: Uint16Array) => void, thisArg?: any): void;
+    forEach(callbackfn: (this: undefined, value: number, index: number, array: Uint16Array) => void): void;
+    forEach(callbackfn: (this: undefined, value: number, index: number, array: Uint16Array) => void, thisArg: undefined): void;
+    forEach<Z>(callbackfn: (this: Z, value: number, index: number, array: Uint16Array) => void, thisArg: Z): void;
 
     /**
       * Returns the index of the first occurrence of a value in an array.
@@ -2772,7 +2851,9 @@ interface Uint16Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    map(callbackfn: (value: number, index: number, array: Uint16Array) => number, thisArg?: any): Uint16Array;
+    map(callbackfn: (this: undefined, value: number, index: number, array: Uint16Array) => number): Uint16Array;
+    map(callbackfn: (this: undefined, value: number, index: number, array: Uint16Array) => number, thisArg: undefined): Uint16Array;
+    map<Z>(callbackfn: (this: Z, value: number, index: number, array: Uint16Array) => number, thisArg: Z): Uint16Array;
 
     /**
       * Calls the specified callback function for all the elements in an array. The return value of
@@ -2856,7 +2937,9 @@ interface Uint16Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    some(callbackfn: (value: number, index: number, array: Uint16Array) => boolean, thisArg?: any): boolean;
+    some(callbackfn: (this: undefined, value: number, index: number, array: Uint16Array) => boolean): boolean;
+    some(callbackfn: (this: undefined, value: number, index: number, array: Uint16Array) => boolean, thisArg: undefined): boolean;
+    some<Z>(callbackfn: (this: Z, value: number, index: number, array: Uint16Array) => boolean, thisArg: Z): boolean;
 
     /**
       * Sorts an array.
@@ -2909,7 +2992,11 @@ interface Uint16ArrayConstructor {
       * @param mapfn A mapping function to call on every element of the array.
       * @param thisArg Value of 'this' used to invoke the mapfn.
       */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint16Array;
+    from(arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint16Array;
+    from(arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint16Array;
+    from<Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint16Array;
+
+    from(arrayLike: ArrayLike<number>): Uint16Array;
 
 }
 declare const Uint16Array: Uint16ArrayConstructor;
@@ -2957,7 +3044,9 @@ interface Int32Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    every(callbackfn: (value: number, index: number, array: Int32Array) => boolean, thisArg?: any): boolean;
+    every(callbackfn: (this: undefined, value: number, index: number, array: Int32Array) => boolean): boolean;
+    every(callbackfn: (this: undefined, value: number, index: number, array: Int32Array) => boolean, thisArg: undefined): boolean;
+    every<Z>(callbackfn: (this: Z, value: number, index: number, array: Int32Array) => boolean, thisArg: Z): boolean;
 
     /**
         * Returns the this object after filling the section identified by start and end with value
@@ -2976,7 +3065,9 @@ interface Int32Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    filter(callbackfn: (value: number, index: number, array: Int32Array) => any, thisArg?: any): Int32Array;
+    filter(callbackfn: (this: undefined, value: number, index: number, array: Int32Array) => any): Int32Array;
+    filter(callbackfn: (this: undefined, value: number, index: number, array: Int32Array) => any, thisArg: undefined): Int32Array;
+    filter<Z>(callbackfn: (this: Z, value: number, index: number, array: Int32Array) => any, thisArg: Z): Int32Array;
 
     /**
       * Returns the value of the first element in the array where predicate is true, and undefined
@@ -2987,7 +3078,9 @@ interface Int32Array {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    find(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number | undefined;
+    find(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean): number | undefined;
+    find(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean, thisArg: undefined): number | undefined;
+    find<Z>(predicate: (this: Z, value: number, index: number, obj: Array<number>) => boolean, thisArg: Z): number | undefined;
 
     /**
       * Returns the index of the first element in the array where predicate is true, and -1
@@ -2998,7 +3091,9 @@ interface Int32Array {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    findIndex(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number;
+    findIndex(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean): number;
+    findIndex(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean, thisArg: undefined): number;
+    findIndex<Z>(predicate: (this: Z, value: number, index: number, obj: Array<number>) => boolean, thisArg: Z): number;
 
     /**
       * Performs the specified action for each element in an array.
@@ -3007,7 +3102,9 @@ interface Int32Array {
       * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    forEach(callbackfn: (value: number, index: number, array: Int32Array) => void, thisArg?: any): void;
+    forEach(callbackfn: (this: undefined, value: number, index: number, array: Int32Array) => void): void;
+    forEach(callbackfn: (this: undefined, value: number, index: number, array: Int32Array) => void, thisArg: undefined): void;
+    forEach<Z>(callbackfn: (this: Z, value: number, index: number, array: Int32Array) => void, thisArg: Z): void;
 
     /**
       * Returns the index of the first occurrence of a value in an array.
@@ -3045,7 +3142,9 @@ interface Int32Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    map(callbackfn: (value: number, index: number, array: Int32Array) => number, thisArg?: any): Int32Array;
+    map(callbackfn: (this: undefined, value: number, index: number, array: Int32Array) => number): Int32Array;
+    map(callbackfn: (this: undefined, value: number, index: number, array: Int32Array) => number, thisArg: undefined): Int32Array;
+    map<Z>(callbackfn: (this: Z, value: number, index: number, array: Int32Array) => number, thisArg: Z): Int32Array;
 
     /**
       * Calls the specified callback function for all the elements in an array. The return value of
@@ -3129,7 +3228,9 @@ interface Int32Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    some(callbackfn: (value: number, index: number, array: Int32Array) => boolean, thisArg?: any): boolean;
+    some(callbackfn: (this: undefined, value: number, index: number, array: Int32Array) => boolean): boolean;
+    some(callbackfn: (this: undefined, value: number, index: number, array: Int32Array) => boolean, thisArg: undefined): boolean;
+    some<Z>(callbackfn: (this: Z, value: number, index: number, array: Int32Array) => boolean, thisArg: Z): boolean;
 
     /**
       * Sorts an array.
@@ -3182,7 +3283,11 @@ interface Int32ArrayConstructor {
       * @param mapfn A mapping function to call on every element of the array.
       * @param thisArg Value of 'this' used to invoke the mapfn.
       */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int32Array;
+    from(arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int32Array;
+    from(arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int32Array;
+    from<Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int32Array;
+
+    from(arrayLike: ArrayLike<number>): Int32Array;
 }
 declare const Int32Array: Int32ArrayConstructor;
 
@@ -3230,7 +3335,9 @@ interface Uint32Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    every(callbackfn: (value: number, index: number, array: Uint32Array) => boolean, thisArg?: any): boolean;
+    every(callbackfn: (this: undefined, value: number, index: number, array: Uint32Array) => boolean): boolean;
+    every(callbackfn: (this: undefined, value: number, index: number, array: Uint32Array) => boolean, thisArg: undefined): boolean;
+    every<Z>(callbackfn: (this: Z, value: number, index: number, array: Uint32Array) => boolean, thisArg: Z): boolean;
 
     /**
         * Returns the this object after filling the section identified by start and end with value
@@ -3249,7 +3356,9 @@ interface Uint32Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    filter(callbackfn: (value: number, index: number, array: Uint32Array) => any, thisArg?: any): Uint32Array;
+    filter(callbackfn: (this: undefined, value: number, index: number, array: Uint32Array) => any): Uint32Array;
+    filter(callbackfn: (this: undefined, value: number, index: number, array: Uint32Array) => any, thisArg: undefined): Uint32Array;
+    filter<Z>(callbackfn: (this: Z, value: number, index: number, array: Uint32Array) => any, thisArg: Z): Uint32Array;
 
     /**
       * Returns the value of the first element in the array where predicate is true, and undefined
@@ -3260,7 +3369,9 @@ interface Uint32Array {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    find(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number | undefined;
+    find(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean): number | undefined;
+    find(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean, thisArg: undefined): number | undefined;
+    find<Z>(predicate: (this: Z, value: number, index: number, obj: Array<number>) => boolean, thisArg: Z): number | undefined;
 
     /**
       * Returns the index of the first element in the array where predicate is true, and -1
@@ -3271,7 +3382,9 @@ interface Uint32Array {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    findIndex(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number;
+    findIndex(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean): number;
+    findIndex(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean, thisArg: undefined): number;
+    findIndex<Z>(predicate: (this: Z, value: number, index: number, obj: Array<number>) => boolean, thisArg: Z): number;
 
     /**
       * Performs the specified action for each element in an array.
@@ -3280,7 +3393,9 @@ interface Uint32Array {
       * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    forEach(callbackfn: (value: number, index: number, array: Uint32Array) => void, thisArg?: any): void;
+    forEach(callbackfn: (this: undefined, value: number, index: number, array: Uint32Array) => void): void;
+    forEach(callbackfn: (this: undefined, value: number, index: number, array: Uint32Array) => void, thisArg: undefined): void;
+    forEach<Z>(callbackfn: (this: Z, value: number, index: number, array: Uint32Array) => void, thisArg: Z): void;
 
     /**
       * Returns the index of the first occurrence of a value in an array.
@@ -3318,7 +3433,9 @@ interface Uint32Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    map(callbackfn: (value: number, index: number, array: Uint32Array) => number, thisArg?: any): Uint32Array;
+    map(callbackfn: (this: undefined, value: number, index: number, array: Uint32Array) => number): Uint32Array;
+    map(callbackfn: (this: undefined, value: number, index: number, array: Uint32Array) => number, thisArg: undefined): Uint32Array;
+    map<Z>(callbackfn: (this: Z, value: number, index: number, array: Uint32Array) => number, thisArg: Z): Uint32Array;
 
     /**
       * Calls the specified callback function for all the elements in an array. The return value of
@@ -3402,7 +3519,9 @@ interface Uint32Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    some(callbackfn: (value: number, index: number, array: Uint32Array) => boolean, thisArg?: any): boolean;
+    some(callbackfn: (this: undefined, value: number, index: number, array: Uint32Array) => boolean): boolean;
+    some(callbackfn: (this: undefined, value: number, index: number, array: Uint32Array) => boolean, thisArg: undefined): boolean;
+    some<Z>(callbackfn: (this: Z, value: number, index: number, array: Uint32Array) => boolean, thisArg: Z): boolean;
 
     /**
       * Sorts an array.
@@ -3455,7 +3574,11 @@ interface Uint32ArrayConstructor {
       * @param mapfn A mapping function to call on every element of the array.
       * @param thisArg Value of 'this' used to invoke the mapfn.
       */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint32Array;
+    from(arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint32Array;
+    from(arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint32Array;
+    from<Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint32Array;
+
+    from(arrayLike: ArrayLike<number>): Uint32Array;
 }
 declare const Uint32Array: Uint32ArrayConstructor;
 
@@ -3503,7 +3626,9 @@ interface Float32Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    every(callbackfn: (value: number, index: number, array: Float32Array) => boolean, thisArg?: any): boolean;
+    every(callbackfn: (this: undefined, value: number, index: number, array: Float32Array) => boolean): boolean;
+    every(callbackfn: (this: undefined, value: number, index: number, array: Float32Array) => boolean, thisArg: undefined): boolean;
+    every<Z>(callbackfn: (this: Z, value: number, index: number, array: Float32Array) => boolean, thisArg: Z): boolean;
 
     /**
         * Returns the this object after filling the section identified by start and end with value
@@ -3522,7 +3647,9 @@ interface Float32Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    filter(callbackfn: (value: number, index: number, array: Float32Array) => any, thisArg?: any): Float32Array;
+    filter(callbackfn: (this: undefined, value: number, index: number, array: Float32Array) => any): Float32Array;
+    filter(callbackfn: (this: undefined, value: number, index: number, array: Float32Array) => any, thisArg: undefined): Float32Array;
+    filter<Z>(callbackfn: (this: Z, value: number, index: number, array: Float32Array) => any, thisArg: Z): Float32Array;
 
     /**
       * Returns the value of the first element in the array where predicate is true, and undefined
@@ -3533,7 +3660,9 @@ interface Float32Array {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    find(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number | undefined;
+    find(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean): number | undefined;
+    find(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean, thisArg: undefined): number | undefined;
+    find<Z>(predicate: (this: Z, value: number, index: number, obj: Array<number>) => boolean, thisArg: Z): number | undefined;
 
     /**
       * Returns the index of the first element in the array where predicate is true, and -1
@@ -3544,7 +3673,9 @@ interface Float32Array {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    findIndex(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number;
+    findIndex(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean): number;
+    findIndex(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean, thisArg: undefined): number;
+    findIndex<Z>(predicate: (this: Z, value: number, index: number, obj: Array<number>) => boolean, thisArg: Z): number;
 
     /**
       * Performs the specified action for each element in an array.
@@ -3553,7 +3684,9 @@ interface Float32Array {
       * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    forEach(callbackfn: (value: number, index: number, array: Float32Array) => void, thisArg?: any): void;
+    forEach(callbackfn: (this: undefined, value: number, index: number, array: Float32Array) => void): void;
+    forEach(callbackfn: (this: undefined, value: number, index: number, array: Float32Array) => void, thisArg: undefined): void;
+    forEach<Z>(callbackfn: (this: Z, value: number, index: number, array: Float32Array) => void, thisArg: Z): void;
 
     /**
       * Returns the index of the first occurrence of a value in an array.
@@ -3591,7 +3724,9 @@ interface Float32Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    map(callbackfn: (value: number, index: number, array: Float32Array) => number, thisArg?: any): Float32Array;
+    map(callbackfn: (this: undefined, value: number, index: number, array: Float32Array) => number): Float32Array;
+    map(callbackfn: (this: undefined, value: number, index: number, array: Float32Array) => number, thisArg: undefined): Float32Array;
+    map<Z>(callbackfn: (this: Z, value: number, index: number, array: Float32Array) => number, thisArg: Z): Float32Array;
 
     /**
       * Calls the specified callback function for all the elements in an array. The return value of
@@ -3675,7 +3810,9 @@ interface Float32Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    some(callbackfn: (value: number, index: number, array: Float32Array) => boolean, thisArg?: any): boolean;
+    some(callbackfn: (this: undefined, value: number, index: number, array: Float32Array) => boolean): boolean;
+    some(callbackfn: (this: undefined, value: number, index: number, array: Float32Array) => boolean, thisArg: undefined): boolean;
+    some<Z>(callbackfn: (this: Z, value: number, index: number, array: Float32Array) => boolean, thisArg: Z): boolean;
 
     /**
       * Sorts an array.
@@ -3728,7 +3865,11 @@ interface Float32ArrayConstructor {
       * @param mapfn A mapping function to call on every element of the array.
       * @param thisArg Value of 'this' used to invoke the mapfn.
       */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float32Array;
+    from(arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Float32Array;
+    from(arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float32Array;
+    from<Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float32Array;
+
+    from(arrayLike: ArrayLike<number>): Float32Array;
 
 }
 declare const Float32Array: Float32ArrayConstructor;
@@ -3777,7 +3918,9 @@ interface Float64Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    every(callbackfn: (value: number, index: number, array: Float64Array) => boolean, thisArg?: any): boolean;
+    every(callbackfn: (this: undefined, value: number, index: number, array: Float64Array) => boolean): boolean;
+    every(callbackfn: (this: undefined, value: number, index: number, array: Float64Array) => boolean, thisArg: undefined): boolean;
+    every<Z>(callbackfn: (this: Z, value: number, index: number, array: Float64Array) => boolean, thisArg: Z): boolean;
 
     /**
         * Returns the this object after filling the section identified by start and end with value
@@ -3796,7 +3939,9 @@ interface Float64Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    filter(callbackfn: (value: number, index: number, array: Float64Array) => any, thisArg?: any): Float64Array;
+    filter(callbackfn: (this: undefined, value: number, index: number, array: Float64Array) => any): Float64Array;
+    filter(callbackfn: (this: undefined, value: number, index: number, array: Float64Array) => any, thisArg: undefined): Float64Array;
+    filter<Z>(callbackfn: (this: Z, value: number, index: number, array: Float64Array) => any, thisArg: Z): Float64Array;
 
     /**
       * Returns the value of the first element in the array where predicate is true, and undefined
@@ -3807,7 +3952,9 @@ interface Float64Array {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    find(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number | undefined;
+    find(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean): number | undefined;
+    find(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean, thisArg: undefined): number | undefined;
+    find<Z>(predicate: (this: Z, value: number, index: number, obj: Array<number>) => boolean, thisArg: Z): number | undefined;
 
     /**
       * Returns the index of the first element in the array where predicate is true, and -1
@@ -3818,7 +3965,9 @@ interface Float64Array {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    findIndex(predicate: (value: number, index: number, obj: Array<number>) => boolean, thisArg?: any): number;
+    findIndex(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean): number;
+    findIndex(predicate: (this: undefined, value: number, index: number, obj: Array<number>) => boolean, thisArg: undefined): number;
+    findIndex<Z>(predicate: (this: Z, value: number, index: number, obj: Array<number>) => boolean, thisArg: Z): number;
 
     /**
       * Performs the specified action for each element in an array.
@@ -3827,7 +3976,9 @@ interface Float64Array {
       * @param thisArg  An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    forEach(callbackfn: (value: number, index: number, array: Float64Array) => void, thisArg?: any): void;
+    forEach(callbackfn: (this: undefined, value: number, index: number, array: Float64Array) => void): void;
+    forEach(callbackfn: (this: undefined, value: number, index: number, array: Float64Array) => void, thisArg: undefined): void;
+    forEach<Z>(callbackfn: (this: Z, value: number, index: number, array: Float64Array) => void, thisArg: Z): void;
 
     /**
       * Returns the index of the first occurrence of a value in an array.
@@ -3865,7 +4016,9 @@ interface Float64Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    map(callbackfn: (value: number, index: number, array: Float64Array) => number, thisArg?: any): Float64Array;
+    map(callbackfn: (this: undefined, value: number, index: number, array: Float64Array) => number): Float64Array;
+    map(callbackfn: (this: undefined, value: number, index: number, array: Float64Array) => number, thisArg: undefined): Float64Array;
+    map<Z>(callbackfn: (this: Z, value: number, index: number, array: Float64Array) => number, thisArg: Z): Float64Array;
 
     /**
       * Calls the specified callback function for all the elements in an array. The return value of
@@ -3949,7 +4102,9 @@ interface Float64Array {
       * @param thisArg An object to which the this keyword can refer in the callbackfn function.
       * If thisArg is omitted, undefined is used as the this value.
       */
-    some(callbackfn: (value: number, index: number, array: Float64Array) => boolean, thisArg?: any): boolean;
+    some(callbackfn: (this: undefined, value: number, index: number, array: Float64Array) => boolean): boolean;
+    some(callbackfn: (this: undefined, value: number, index: number, array: Float64Array) => boolean, thisArg: undefined): boolean;
+    some<Z>(callbackfn: (this: Z, value: number, index: number, array: Float64Array) => boolean, thisArg: Z): boolean;
 
     /**
       * Sorts an array.
@@ -4002,7 +4157,11 @@ interface Float64ArrayConstructor {
       * @param mapfn A mapping function to call on every element of the array.
       * @param thisArg Value of 'this' used to invoke the mapfn.
       */
-    from(arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float64Array;
+    from(arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Float64Array;
+    from(arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float64Array;
+    from<Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float64Array;
+
+    from(arrayLike: ArrayLike<number>): Float64Array;
 }
 declare const Float64Array: Float64ArrayConstructor;
 
diff --git a/src/server/cancellationToken/cancellationToken.ts b/src/server/cancellationToken/cancellationToken.ts
index 0e7969c1e45..6f2f4a8897c 100644
--- a/src/server/cancellationToken/cancellationToken.ts
+++ b/src/server/cancellationToken/cancellationToken.ts
@@ -48,7 +48,7 @@ function createCancellationToken(args: string[]): ServerCancellationToken {
         return {
             isCancellationRequested: () =>  perRequestPipeName !== undefined && pipeExists(perRequestPipeName),
             setRequest(requestId: number) {
-                currentRequestId = currentRequestId;
+                currentRequestId = requestId;
                 perRequestPipeName = namePrefix + requestId;
             },
             resetRequest(requestId: number) {
@@ -67,4 +67,4 @@ function createCancellationToken(args: string[]): ServerCancellationToken {
         };
     }
 }
-export = createCancellationToken;
\ No newline at end of file
+export = createCancellationToken;
diff --git a/src/server/protocol.ts b/src/server/protocol.ts
index d054867cd1c..d12aa2e0a48 100644
--- a/src/server/protocol.ts
+++ b/src/server/protocol.ts
@@ -2127,6 +2127,17 @@ namespace ts.server.protocol {
         payload: any;
     }
 
+    export type TypesInstallerInitializationFailedEventName = "typesInstallerInitializationFailed";
+
+    export interface TypesInstallerInitializationFailedEvent extends Event {
+        event: TypesInstallerInitializationFailedEventName;
+        body: TypesInstallerInitializationFailedEventBody;
+    }
+
+    export interface TypesInstallerInitializationFailedEventBody {
+        message: string;
+    }
+
     export type TypingsInstalledTelemetryEventName = "typingsInstalled";
 
     export interface TypingsInstalledTelemetryEventBody extends TelemetryEventBody {
diff --git a/src/server/server.ts b/src/server/server.ts
index 2c68963ec5c..bfd4e422047 100644
--- a/src/server/server.ts
+++ b/src/server/server.ts
@@ -131,6 +131,14 @@ namespace ts.server {
         constructor(private readonly logFilename: string,
             private readonly traceToConsole: boolean,
             private readonly level: LogLevel) {
+            if (this.logFilename) {
+                try {
+                    this.fd = fs.openSync(this.logFilename, "w");
+                }
+                catch(_) {
+                    // swallow the error and keep logging disabled if file cannot be opened
+                }
+            }
         }
 
         static padStringRight(str: string, padding: string) {
@@ -175,11 +183,6 @@ namespace ts.server {
         }
 
         msg(s: string, type: Msg.Types = Msg.Err) {
-            if (this.fd < 0) {
-                if (this.logFilename) {
-                    this.fd = fs.openSync(this.logFilename, "w");
-                }
-            }
             if (this.fd >= 0 || this.traceToConsole) {
                 s = s + "\n";
                 const prefix = Logger.padStringRight(type + " " + this.seq.toString(), "          ");
@@ -301,11 +304,23 @@ namespace ts.server {
             });
         }
 
-        private handleMessage(response: SetTypings | InvalidateCachedTypings | BeginInstallTypes | EndInstallTypes) {
+        private handleMessage(response: SetTypings | InvalidateCachedTypings | BeginInstallTypes | EndInstallTypes | InitializationFailedResponse) {
             if (this.logger.hasLevel(LogLevel.verbose)) {
                 this.logger.info(`Received response: ${JSON.stringify(response)}`);
             }
 
+            if (response.kind === EventInitializationFailed) {
+                if (!this.eventSender) {
+                    return;
+                }
+                const body: protocol.TypesInstallerInitializationFailedEventBody = {
+                    message: response.message
+                }
+                const eventName: protocol.TypesInstallerInitializationFailedEventName = "typesInstallerInitializationFailed";
+                this.eventSender.event(body, eventName);
+                return;
+            }
+
             if (response.kind === EventBeginInstallTypes) {
                 if (!this.eventSender) {
                     return;
@@ -410,6 +425,9 @@ namespace ts.server {
     }
 
     function parseLoggingEnvironmentString(logEnvStr: string): LogOptions {
+        if (!logEnvStr) {
+            return {};
+        }
         const logEnv: LogOptions = { logToFile: true };
         const args = logEnvStr.split(" ");
         const len = args.length - 1;
@@ -422,8 +440,8 @@ namespace ts.server {
                         logEnv.file = stripQuotes(value);
                         break;
                     case "-level":
-                        const level: LogLevel = (<any>LogLevel)[value];
-                        logEnv.detailLevel = typeof level === "number" ? level : LogLevel.normal;
+                        const level = getLogLevel(value);
+                        logEnv.detailLevel = level !== undefined ? level : LogLevel.normal;
                         break;
                     case "-traceToConsole":
                         logEnv.traceToConsole = value.toLowerCase() === "true";
@@ -437,28 +455,32 @@ namespace ts.server {
         return logEnv;
     }
 
-    // TSS_LOG "{ level: "normal | verbose | terse", file?: string}"
-    function createLoggerFromEnv() {
-        let fileName: string = undefined;
-        let detailLevel = LogLevel.normal;
-        let traceToConsole = false;
-        const logEnvStr = process.env["TSS_LOG"];
-        if (logEnvStr) {
-            const logEnv = parseLoggingEnvironmentString(logEnvStr);
-            if (logEnv.logToFile) {
-                if (logEnv.file) {
-                    fileName = logEnv.file;
-                }
-                else {
-                    fileName = __dirname + "/.log" + process.pid.toString();
+    function getLogLevel(level: string) {
+        if (level) {
+            const l = level.toLowerCase();
+            for (const name in LogLevel) {
+                if (isNaN(+name) && l === name.toLowerCase()) {
+                    return <LogLevel><any>LogLevel[name];
                 }
             }
-            if (logEnv.detailLevel) {
-                detailLevel = logEnv.detailLevel;
-            }
-            traceToConsole = logEnv.traceToConsole;
         }
-        return new Logger(fileName, traceToConsole, detailLevel);
+        return undefined;
+    }
+
+    // TSS_LOG "{ level: "normal | verbose | terse", file?: string}"
+    function createLogger() {
+        const cmdLineLogFileName = findArgument("--logFile");
+        const cmdLineVerbosity = getLogLevel(findArgument("--logVerbosity"));
+        const envLogOptions = parseLoggingEnvironmentString(process.env["TSS_LOG"]);
+
+        const logFileName = cmdLineLogFileName 
+            ? stripQuotes(cmdLineLogFileName) 
+            : envLogOptions.logToFile
+                ? envLogOptions.file || (__dirname + "/.log" + process.pid.toString())
+                : undefined;
+
+        const logVerbosity = cmdLineVerbosity || envLogOptions.detailLevel;
+        return new Logger(logFileName, envLogOptions.traceToConsole, logVerbosity)
     }
     // This places log file in the directory containing editorServices.js
     // TODO: check that this location is writable
@@ -555,7 +577,6 @@ namespace ts.server {
     // to increase the chunk size or decrease the interval
     // time dynamically to match the large reference set?
     const pollingWatchedFileSet = createPollingWatchedFileSet();
-    const logger = createLoggerFromEnv();
 
     const pending: Buffer[] = [];
     let canWrite = true;
@@ -607,6 +628,8 @@ namespace ts.server {
         return s.length > 2 && s.charCodeAt(0) === CharacterCodes.slash && s.charCodeAt(1) === CharacterCodes.slash;
     }
 
+    const logger = createLogger();
+
     const sys = <ServerHost>ts.sys;
     // use watchGuard process on Windows when node version is 4 or later
     const useWatchGuard = process.platform === "win32" && getNodeMajorVersion() >= 4;
diff --git a/src/server/session.ts b/src/server/session.ts
index b5e7e44970d..64fce61a095 100644
--- a/src/server/session.ts
+++ b/src/server/session.ts
@@ -1420,8 +1420,9 @@ namespace ts.server {
             const scriptInfo = project.getScriptInfoForNormalizedPath(file);
             const startPosition = getStartPosition();
             const endPosition = getEndPosition();
+            const formatOptions = this.projectService.getFormatCodeOptions(file);
 
-            const codeActions = project.getLanguageService().getCodeFixesAtPosition(file, startPosition, endPosition, args.errorCodes);
+            const codeActions = project.getLanguageService().getCodeFixesAtPosition(file, startPosition, endPosition, args.errorCodes, formatOptions);
             if (!codeActions) {
                 return undefined;
             }
diff --git a/src/server/shared.ts b/src/server/shared.ts
index 77f66fc5a2d..5d65f8c90e9 100644
--- a/src/server/shared.ts
+++ b/src/server/shared.ts
@@ -5,6 +5,7 @@ namespace ts.server {
     export const ActionInvalidate: ActionInvalidate = "action::invalidate";
     export const EventBeginInstallTypes: EventBeginInstallTypes = "event::beginInstallTypes";
     export const EventEndInstallTypes: EventEndInstallTypes = "event::endInstallTypes";
+    export const EventInitializationFailed: EventInitializationFailed = "event::initializationFailed";
 
     export namespace Arguments {
         export const GlobalCacheLocation = "--globalTypingsCacheLocation";
diff --git a/src/server/types.ts b/src/server/types.ts
index 6edf424cbe6..81e1f09639f 100644
--- a/src/server/types.ts
+++ b/src/server/types.ts
@@ -47,9 +47,15 @@ declare namespace ts.server {
     export type ActionInvalidate = "action::invalidate";
     export type EventBeginInstallTypes = "event::beginInstallTypes";
     export type EventEndInstallTypes = "event::endInstallTypes";
+    export type EventInitializationFailed = "event::initializationFailed";
 
     export interface TypingInstallerResponse {
-        readonly kind: ActionSet | ActionInvalidate | EventBeginInstallTypes | EventEndInstallTypes;
+        readonly kind: ActionSet | ActionInvalidate | EventBeginInstallTypes | EventEndInstallTypes | EventInitializationFailed;
+    }
+
+    export interface InitializationFailedResponse extends TypingInstallerResponse {
+        readonly kind: EventInitializationFailed;
+        readonly message: string;
     }
 
     export interface ProjectResponse extends TypingInstallerResponse {
diff --git a/src/server/typingsInstaller/nodeTypingsInstaller.ts b/src/server/typingsInstaller/nodeTypingsInstaller.ts
index 0a69d701953..74497504ba3 100644
--- a/src/server/typingsInstaller/nodeTypingsInstaller.ts
+++ b/src/server/typingsInstaller/nodeTypingsInstaller.ts
@@ -13,14 +13,20 @@ namespace ts.server.typingsInstaller {
     } = require("path");
 
     class FileLog implements Log {
+        private logEnabled = true;
         constructor(private readonly logFile?: string) {
         }
 
         isEnabled() {
-            return this.logFile !== undefined;
+            return this.logEnabled && this.logFile !== undefined;
         }
         writeLine(text: string) {
-            fs.appendFileSync(this.logFile, text + sys.newLine);
+            try {
+                fs.appendFileSync(this.logFile, text + sys.newLine);
+            }
+            catch(e) {
+                this.logEnabled = false;
+            }
         }
     }
 
@@ -68,6 +74,8 @@ namespace ts.server.typingsInstaller {
         private readonly npmPath: string;
         readonly typesRegistry: Map<void>;
 
+        private delayedInitializationError: InitializationFailedResponse;
+
         constructor(globalTypingsCacheLocation: string, throttleLimit: number, log: Log) {
             super(
                 sys,
@@ -93,6 +101,11 @@ namespace ts.server.typingsInstaller {
                 if (this.log.isEnabled()) {
                     this.log.writeLine(`Error updating ${TypesRegistryPackageName} package: ${(<Error>e).message}`);
                 }
+                // store error info to report it later when it is known that server is already listening to events from typings installer
+                this.delayedInitializationError = {
+                    kind: "event::initializationFailed",
+                    message: (<Error>e).message
+                };
             }
 
             this.typesRegistry = loadTypesRegistryFile(getTypesRegistryFileLocation(globalTypingsCacheLocation), this.installTypingHost, this.log);
@@ -100,6 +113,11 @@ namespace ts.server.typingsInstaller {
 
         listen() {
             process.on("message", (req: DiscoverTypings | CloseProject) => {
+                if (this.delayedInitializationError) {
+                    // report initializationFailed error
+                    this.sendResponse(this.delayedInitializationError);
+                    this.delayedInitializationError = undefined;
+                }
                 switch (req.kind) {
                     case "discover":
                         this.install(req);
@@ -110,7 +128,7 @@ namespace ts.server.typingsInstaller {
             });
         }
 
-        protected sendResponse(response: SetTypings | InvalidateCachedTypings | BeginInstallTypes | EndInstallTypes) {
+        protected sendResponse(response: SetTypings | InvalidateCachedTypings | BeginInstallTypes | EndInstallTypes | InitializationFailedResponse) {
             if (this.log.isEnabled()) {
                 this.log.writeLine(`Sending response: ${JSON.stringify(response)}`);
             }
diff --git a/src/services/codeFixProvider.ts b/src/services/codeFixProvider.ts
index c22ba779d19..bab5356e99c 100644
--- a/src/services/codeFixProvider.ts
+++ b/src/services/codeFixProvider.ts
@@ -13,6 +13,7 @@ namespace ts {
         newLineCharacter: string;
         host: LanguageServiceHost;
         cancellationToken: CancellationToken;
+        rulesProvider: formatting.RulesProvider;
     }
 
     export namespace codefix {
diff --git a/src/services/codefixes/fixClassSuperMustPrecedeThisAccess.ts b/src/services/codefixes/fixClassSuperMustPrecedeThisAccess.ts
index 4528c48774d..6d7efb64c6f 100644
--- a/src/services/codefixes/fixClassSuperMustPrecedeThisAccess.ts
+++ b/src/services/codefixes/fixClassSuperMustPrecedeThisAccess.ts
@@ -26,22 +26,13 @@ namespace ts.codefix {
                     }
                 }
             }
-
-            const newPosition = getOpenBraceEnd(<ConstructorDeclaration>constructor, sourceFile);
-            const changes = [{
-                fileName: sourceFile.fileName, textChanges: [{
-                    newText: superCall.getText(sourceFile),
-                    span: { start: newPosition, length: 0 }
-                },
-                {
-                    newText: "",
-                    span: { start: superCall.getStart(sourceFile), length: superCall.getWidth(sourceFile) }
-                }]
-            }];
+            const changeTracker = textChanges.ChangeTracker.fromCodeFixContext(context);
+            changeTracker.insertNodeAfter(sourceFile, getOpenBrace(<ConstructorDeclaration>constructor, sourceFile), superCall, { suffix: context.newLineCharacter });
+            changeTracker.deleteNode(sourceFile, superCall);
 
             return [{
                 description: getLocaleSpecificMessage(Diagnostics.Make_super_call_the_first_statement_in_the_constructor),
-                changes
+                changes: changeTracker.getChanges()
             }];
 
             function findSuperCall(n: Node): ExpressionStatement {
diff --git a/src/services/codefixes/fixConstructorForDerivedNeedSuperCall.ts b/src/services/codefixes/fixConstructorForDerivedNeedSuperCall.ts
index 0dede87cf28..822c34842fd 100644
--- a/src/services/codefixes/fixConstructorForDerivedNeedSuperCall.ts
+++ b/src/services/codefixes/fixConstructorForDerivedNeedSuperCall.ts
@@ -10,10 +10,13 @@ namespace ts.codefix {
                 return undefined;
             }
 
-            const newPosition = getOpenBraceEnd(<ConstructorDeclaration>token.parent, sourceFile);
+            const changeTracker = textChanges.ChangeTracker.fromCodeFixContext(context);
+            const superCall = createStatement(createCall(createSuper(), /*typeArguments*/ undefined, /*argumentsArray*/ emptyArray));
+            changeTracker.insertNodeAfter(sourceFile, getOpenBrace(<ConstructorDeclaration>token.parent, sourceFile), superCall, { suffix: context.newLineCharacter });
+
             return [{
                 description: getLocaleSpecificMessage(Diagnostics.Add_missing_super_call),
-                changes: [{ fileName: sourceFile.fileName, textChanges: [{ newText: "super();", span: { start: newPosition, length: 0 } }] }]
+                changes: changeTracker.getChanges()
             }];
         }
     });
diff --git a/src/services/codefixes/fixExtendsInterfaceBecomesImplements.ts b/src/services/codefixes/fixExtendsInterfaceBecomesImplements.ts
index 1e72700ec01..80d4345a943 100644
--- a/src/services/codefixes/fixExtendsInterfaceBecomesImplements.ts
+++ b/src/services/codefixes/fixExtendsInterfaceBecomesImplements.ts
@@ -21,26 +21,20 @@ namespace ts.codefix {
                 return undefined;
             }
 
-            let changeStart = extendsToken.getStart(sourceFile);
-            let changeEnd = extendsToken.getEnd();
-            const textChanges: TextChange[] = [{ newText: " implements", span: { start: changeStart, length: changeEnd - changeStart } }];
+            const changeTracker = textChanges.ChangeTracker.fromCodeFixContext(context);
+            changeTracker.replaceNode(sourceFile, extendsToken, createToken(SyntaxKind.ImplementsKeyword));
 
             // We replace existing keywords with commas.
             for (let i = 1; i < heritageClauses.length; i++) {
                 const keywordToken = heritageClauses[i].getFirstToken();
                 if (keywordToken) {
-                    changeStart = keywordToken.getStart(sourceFile);
-                    changeEnd = keywordToken.getEnd();
-                    textChanges.push({ newText: ",", span: { start: changeStart, length: changeEnd - changeStart } });
+                    changeTracker.replaceNode(sourceFile, keywordToken, createToken(SyntaxKind.CommaToken));
                 }
             }
 
             const result = [{
                 description: getLocaleSpecificMessage(Diagnostics.Change_extends_to_implements),
-                changes: [{
-                    fileName: sourceFile.fileName,
-                    textChanges: textChanges
-                }]
+                changes: changeTracker.getChanges()
             }];
 
             return result;
diff --git a/src/services/codefixes/fixForgottenThisPropertyAccess.ts b/src/services/codefixes/fixForgottenThisPropertyAccess.ts
index c9d59dd8337..711a3289a27 100644
--- a/src/services/codefixes/fixForgottenThisPropertyAccess.ts
+++ b/src/services/codefixes/fixForgottenThisPropertyAccess.ts
@@ -5,11 +5,15 @@ namespace ts.codefix {
         getCodeActions: (context: CodeFixContext) => {
             const sourceFile = context.sourceFile;
             const token = getTokenAtPosition(sourceFile, context.span.start);
-            const start = token.getStart(sourceFile);
+            if (token.kind !== SyntaxKind.Identifier) {
+                return undefined;
+            }
+            const changeTracker = textChanges.ChangeTracker.fromCodeFixContext(context);
+            changeTracker.replaceNode(sourceFile, token, createPropertyAccess(createThis(), <Identifier>token));
 
             return [{
                 description: getLocaleSpecificMessage(Diagnostics.Add_this_to_unresolved_variable),
-                changes: [{ fileName: sourceFile.fileName, textChanges: [{ newText: "this.", span: { start, length: 0 } }] }]
+                changes: changeTracker.getChanges()
             }];
         }
     });
diff --git a/src/services/codefixes/importFixes.ts b/src/services/codefixes/importFixes.ts
index 3e07efbc3de..743c13ccf38 100644
--- a/src/services/codefixes/importFixes.ts
+++ b/src/services/codefixes/importFixes.ts
@@ -130,7 +130,7 @@ namespace ts.codefix {
 
             // this is a module id -> module import declaration map
             const cachedImportDeclarations: (ImportDeclaration | ImportEqualsDeclaration)[][] = [];
-            let cachedNewImportInsertPosition: number;
+            let lastImportDeclaration: Node;
 
             const currentTokenMeaning = getMeaningFromLocation(token);
             if (context.errorCode === Diagnostics._0_refers_to_a_UMD_global_but_the_current_file_is_a_module_Consider_adding_an_import_instead.code) {
@@ -138,14 +138,14 @@ namespace ts.codefix {
                 return getCodeActionForImport(symbol, /*isDefault*/ false, /*isNamespaceImport*/ true);
             }
 
-            const allPotentialModules = checker.getAmbientModules();
+            const candidateModules = checker.getAmbientModules();
             for (const otherSourceFile of allSourceFiles) {
                 if (otherSourceFile !== sourceFile && isExternalOrCommonJsModule(otherSourceFile)) {
-                    allPotentialModules.push(otherSourceFile.symbol);
+                    candidateModules.push(otherSourceFile.symbol);
                 }
             }
 
-            for (const moduleSymbol of allPotentialModules) {
+            for (const moduleSymbol of candidateModules) {
                 context.cancellationToken.throwIfCancellationRequested();
 
                 // check the default export
@@ -277,14 +277,12 @@ namespace ts.codefix {
                          * If the existing import declaration already has a named import list, just
                          * insert the identifier into that list.
                          */
-                        const textChange = getTextChangeForImportClause(namedImportDeclaration.importClause);
+                        const fileTextChanges = getTextChangeForImportClause(namedImportDeclaration.importClause);
                         const moduleSpecifierWithoutQuotes = stripQuotes(namedImportDeclaration.moduleSpecifier.getText());
                         actions.push(createCodeAction(
                             Diagnostics.Add_0_to_existing_import_declaration_from_1,
                             [name, moduleSpecifierWithoutQuotes],
-                            textChange.newText,
-                            textChange.span,
-                            sourceFile.fileName,
+                            fileTextChanges,
                             "InsertingIntoExistingImport",
                             moduleSpecifierWithoutQuotes
                         ));
@@ -302,49 +300,31 @@ namespace ts.codefix {
                         return declaration.moduleReference.getText();
                     }
 
-                    function getTextChangeForImportClause(importClause: ImportClause): TextChange {
-                        const newImportText = isDefault ? `default as ${name}` : name;
+                    function getTextChangeForImportClause(importClause: ImportClause): FileTextChanges[] {
+                        //const newImportText = isDefault ? `default as ${name}` : name;
                         const importList = <NamedImports>importClause.namedBindings;
+                        const newImportSpecifier = createImportSpecifier(/*propertyName*/ undefined, createIdentifier(name));
                         // case 1:
                         // original text: import default from "module"
                         // change to: import default, { name } from "module"
-                        if (!importList && importClause.name) {
-                            const start = importClause.name.getEnd();
-                            return {
-                                newText: `, { ${newImportText} }`,
-                                span: { start, length: 0 }
-                            };
-                        }
-
                         // case 2:
                         // original text: import {} from "module"
                         // change to: import { name } from "module"
-                        if (importList.elements.length === 0) {
-                            const start = importList.getStart();
-                            return {
-                                newText: `{ ${newImportText} }`,
-                                span: { start, length: importList.getEnd() - start }
-                            };
+                        if (!importList || importList.elements.length === 0) {
+                            const newImportClause = createImportClause(importClause.name, createNamedImports([newImportSpecifier]));
+                            return createChangeTracker().replaceNode(sourceFile, importClause, newImportClause).getChanges();
                         }
 
-                        // case 3:
-                        // original text: import { foo, bar } from "module"
-                        // change to: import { foo, bar, name } from "module"
-                        const insertPoint = importList.elements[importList.elements.length - 1].getEnd();
                         /**
                          * If the import list has one import per line, preserve that. Otherwise, insert on same line as last element
                          *     import {
                          *         foo
                          *     } from "./module";
                          */
-                        const startLine = getLineOfLocalPosition(sourceFile, importList.getStart());
-                        const endLine = getLineOfLocalPosition(sourceFile, importList.getEnd());
-                        const oneImportPerLine = endLine - startLine > importList.elements.length;
-
-                        return {
-                            newText: `,${oneImportPerLine ? context.newLineCharacter : " "}${newImportText}`,
-                            span: { start: insertPoint, length: 0 }
-                        };
+                        return createChangeTracker().insertNodeInListAfter(
+                            sourceFile,
+                            importList.elements[importList.elements.length - 1],
+                            newImportSpecifier).getChanges();
                     }
 
                     function getCodeActionForNamespaceImport(declaration: ImportDeclaration | ImportEqualsDeclaration): ImportCodeAction {
@@ -370,48 +350,47 @@ namespace ts.codefix {
                         return createCodeAction(
                             Diagnostics.Change_0_to_1,
                             [name, `${namespacePrefix}.${name}`],
-                            `${namespacePrefix}.`,
-                            { start: token.getStart(), length: 0 },
-                            sourceFile.fileName,
+                            createChangeTracker().replaceNode(sourceFile, token, createPropertyAccess(createIdentifier(namespacePrefix), name)).getChanges(),
                             "CodeChange"
                         );
                     }
                 }
 
                 function getCodeActionForNewImport(moduleSpecifier?: string): ImportCodeAction {
-                    if (!cachedNewImportInsertPosition) {
+                    if (!lastImportDeclaration) {
                         // insert after any existing imports
-                        let lastModuleSpecifierEnd = -1;
-                        for (const moduleSpecifier of sourceFile.imports) {
-                            const end = moduleSpecifier.getEnd();
-                            if (!lastModuleSpecifierEnd || end > lastModuleSpecifierEnd) {
-                                lastModuleSpecifierEnd = end;
+                        for (let i = sourceFile.statements.length - 1; i >= 0; i--) {
+                            const statement = sourceFile.statements[i];
+                            if (statement.kind === SyntaxKind.ImportEqualsDeclaration || statement.kind === SyntaxKind.ImportDeclaration) {
+                                lastImportDeclaration = statement;
+                                break;
                             }
                         }
-                        cachedNewImportInsertPosition = lastModuleSpecifierEnd > 0 ? sourceFile.getLineEndOfPosition(lastModuleSpecifierEnd) : sourceFile.getStart();
                     }
 
                     const getCanonicalFileName = createGetCanonicalFileName(useCaseSensitiveFileNames);
                     const moduleSpecifierWithoutQuotes = stripQuotes(moduleSpecifier || getModuleSpecifierForNewImport());
-                    const importStatementText = isDefault
-                        ? `import ${name} from "${moduleSpecifierWithoutQuotes}"`
+                    const changeTracker = createChangeTracker();
+                    const importClause = isDefault
+                        ? createImportClause(createIdentifier(name), /*namedBindings*/ undefined)
                         : isNamespaceImport
-                            ? `import * as ${name} from "${moduleSpecifierWithoutQuotes}"`
-                            : `import { ${name} } from "${moduleSpecifierWithoutQuotes}"`;
+                            ? createImportClause(/*name*/ undefined, createNamespaceImport(createIdentifier(name)))
+                            : createImportClause(/*name*/ undefined, createNamedImports([createImportSpecifier(/*propertyName*/ undefined, createIdentifier(name))]));
+                    const importDecl = createImportDeclaration(/*decorators*/ undefined, /*modifiers*/ undefined, importClause, createLiteral(moduleSpecifierWithoutQuotes));
+                    if (!lastImportDeclaration) {
+                        changeTracker.insertNodeAt(sourceFile, sourceFile.getStart(), importDecl, { suffix: `${context.newLineCharacter}${context.newLineCharacter}` });
+                    }
+                    else {
+                        changeTracker.insertNodeAfter(sourceFile, lastImportDeclaration, importDecl, { suffix: context.newLineCharacter });
+                    }
 
                     // if this file doesn't have any import statements, insert an import statement and then insert a new line
                     // between the only import statement and user code. Otherwise just insert the statement because chances
                     // are there are already a new line seperating code and import statements.
-                    const newText = cachedNewImportInsertPosition === sourceFile.getStart()
-                        ? `${importStatementText};${context.newLineCharacter}${context.newLineCharacter}`
-                        : `${context.newLineCharacter}${importStatementText};`;
-
                     return createCodeAction(
                         Diagnostics.Import_0_from_1,
                         [name, `"${moduleSpecifierWithoutQuotes}"`],
-                        newText,
-                        { start: cachedNewImportInsertPosition, length: 0 },
-                        sourceFile.fileName,
+                        changeTracker.getChanges(),
                         "NewImport",
                         moduleSpecifierWithoutQuotes
                     );
@@ -576,17 +555,19 @@ namespace ts.codefix {
 
             }
 
+            function createChangeTracker() {
+                return textChanges.ChangeTracker.fromCodeFixContext(context);;
+            }
+
             function createCodeAction(
                 description: DiagnosticMessage,
                 diagnosticArgs: string[],
-                newText: string,
-                span: TextSpan,
-                fileName: string,
+                changes: FileTextChanges[],
                 kind: ImportCodeActionKind,
                 moduleSpecifier?: string): ImportCodeAction {
                 return {
                     description: formatMessage.apply(undefined, [undefined, description].concat(<any[]>diagnosticArgs)),
-                    changes: [{ fileName, textChanges: [{ newText, span }] }],
+                    changes,
                     kind,
                     moduleSpecifier
                 };
diff --git a/src/services/codefixes/unusedIdentifierFixes.ts b/src/services/codefixes/unusedIdentifierFixes.ts
index 6c8bd0a9dbe..f77f9723d0f 100644
--- a/src/services/codefixes/unusedIdentifierFixes.ts
+++ b/src/services/codefixes/unusedIdentifierFixes.ts
@@ -25,17 +25,17 @@ namespace ts.codefix {
                                     const forStatement = <ForStatement>token.parent.parent.parent;
                                     const forInitializer = <VariableDeclarationList>forStatement.initializer;
                                     if (forInitializer.declarations.length === 1) {
-                                        return createCodeFixToRemoveNode(forInitializer);
+                                        return deleteNode(forInitializer);
                                     }
                                     else {
-                                        return removeSingleItem(forInitializer.declarations, token);
+                                        return deleteNodeInList(token.parent);
                                     }
 
                                 case SyntaxKind.ForOfStatement:
                                     const forOfStatement = <ForOfStatement>token.parent.parent.parent;
                                     if (forOfStatement.initializer.kind === SyntaxKind.VariableDeclarationList) {
                                         const forOfInitializer = <VariableDeclarationList>forOfStatement.initializer;
-                                        return createCodeFix("{}", forOfInitializer.declarations[0].getStart(), forOfInitializer.declarations[0].getWidth());
+                                        return replaceNode(forOfInitializer.declarations[0], createObjectLiteral());
                                     }
                                     break;
 
@@ -47,51 +47,59 @@ namespace ts.codefix {
                                 case SyntaxKind.CatchClause:
                                     const catchClause = <CatchClause>token.parent.parent;
                                     const parameter = catchClause.variableDeclaration.getChildren()[0];
-                                    return createCodeFixToRemoveNode(parameter);
+                                    return deleteNode(parameter);
 
                                 default:
                                     const variableStatement = <VariableStatement>token.parent.parent.parent;
                                     if (variableStatement.declarationList.declarations.length === 1) {
-                                        return createCodeFixToRemoveNode(variableStatement);
+                                        return deleteNode(variableStatement);
                                     }
                                     else {
-                                        const declarations = variableStatement.declarationList.declarations;
-                                        return removeSingleItem(declarations, token);
+                                        return deleteNodeInList(token.parent);
                                     }
                             }
 
                         case SyntaxKind.TypeParameter:
                             const typeParameters = (<DeclarationWithTypeParameters>token.parent.parent).typeParameters;
                             if (typeParameters.length === 1) {
-                                return createCodeFix("", token.parent.pos - 1, token.parent.end - token.parent.pos + 2);
+                                const previousToken = getTokenAtPosition(sourceFile, typeParameters.pos - 1);
+                                if (!previousToken || previousToken.kind !== SyntaxKind.LessThanToken) {
+                                    return deleteRange(typeParameters);
+                                }
+                                const nextToken = getTokenAtPosition(sourceFile, typeParameters.end);
+                                if (!nextToken || nextToken.kind !== SyntaxKind.GreaterThanToken) {
+                                    return deleteRange(typeParameters);
+                                }
+                                return deleteNodeRange(previousToken, nextToken);
                             }
                             else {
-                                return removeSingleItem(typeParameters, token);
+                                return deleteNodeInList(token.parent);
                             }
 
                         case ts.SyntaxKind.Parameter:
                             const functionDeclaration = <FunctionDeclaration>token.parent.parent;
                             if (functionDeclaration.parameters.length === 1) {
-                                return createCodeFixToRemoveNode(token.parent);
+                                return deleteNode(token.parent);
                             }
                             else {
-                                return removeSingleItem(functionDeclaration.parameters, token);
+                                return deleteNodeInList(token.parent);
                             }
 
                         // handle case where 'import a = A;'
                         case SyntaxKind.ImportEqualsDeclaration:
-                            const importEquals = findImportDeclaration(token);
-                            return createCodeFixToRemoveNode(importEquals);
+                            const importEquals = getAncestor(token, SyntaxKind.ImportEqualsDeclaration);
+                            return deleteNode(importEquals);
 
                         case SyntaxKind.ImportSpecifier:
                             const namedImports = <NamedImports>token.parent.parent;
                             if (namedImports.elements.length === 1) {
                                 // Only 1 import and it is unused. So the entire declaration should be removed.
-                                const importSpec = findImportDeclaration(token);
-                                return createCodeFixToRemoveNode(importSpec);
+                                const importSpec = getAncestor(token, SyntaxKind.ImportDeclaration);
+                                return deleteNode(importSpec);
                             }
                             else {
-                                return removeSingleItem(namedImports.elements, token);
+                                // delete import specifier
+                                return deleteNodeInList(token.parent);
                             }
 
                         // handle case where "import d, * as ns from './file'"
@@ -99,92 +107,79 @@ namespace ts.codefix {
                         case SyntaxKind.ImportClause: // this covers both 'import |d|' and 'import |d,| *'
                             const importClause = <ImportClause>token.parent;
                             if (!importClause.namedBindings) { // |import d from './file'| or |import * as ns from './file'|
-                                const importDecl = findImportDeclaration(importClause);
-                                return createCodeFixToRemoveNode(importDecl);
+                                const importDecl = getAncestor(importClause, SyntaxKind.ImportDeclaration);
+                                return deleteNode(importDecl);
                             }
                             else {
                                 // import |d,| * as ns from './file'
-                                const start = importClause.name.getStart();
-                                const text = sourceFile.text;
-                                let end = getFirstNonSpaceCharacterPosition(text, importClause.name.end);
-                                if (sourceFile.text.charCodeAt(end) === CharacterCodes.comma) {
-                                    end = getFirstNonSpaceCharacterPosition(text, end + 1);
+                                const start = importClause.name.getStart(sourceFile);
+                                const nextToken = getTokenAtPosition(sourceFile, importClause.name.end);
+                                if (nextToken && nextToken.kind === SyntaxKind.CommaToken) {
+                                    // shift first non-whitespace position after comma to the start position of the node
+                                    return deleteRange({ pos: start, end: skipTrivia(sourceFile.text, nextToken.end, /*stopAfterLineBreaks*/ false, /*stopAtComments*/true) });
+                                }
+                                else {
+                                    return deleteNode(importClause.name);
                                 }
-
-                                return createCodeFix("", start, end - start);
                             }
 
                         case SyntaxKind.NamespaceImport:
                             const namespaceImport = <NamespaceImport>token.parent;
                             if (namespaceImport.name == token && !(<ImportClause>namespaceImport.parent).name) {
-                                const importDecl = findImportDeclaration(namespaceImport);
-                                return createCodeFixToRemoveNode(importDecl);
+                                const importDecl = getAncestor(namespaceImport, SyntaxKind.ImportDeclaration);
+                                return deleteNode(importDecl);
                             }
                             else {
-                                const start = (<ImportClause>namespaceImport.parent).name.end;
-                                return createCodeFix("", start, (<ImportClause>namespaceImport.parent).namedBindings.end - start);
+                                const previousToken = getTokenAtPosition(sourceFile, namespaceImport.pos - 1);
+                                if (previousToken && previousToken.kind === SyntaxKind.CommaToken) {
+                                    const startPosition = textChanges.getAdjustedStartPosition(sourceFile, previousToken, {}, textChanges.Position.FullStart);
+                                    return deleteRange({ pos: startPosition, end: namespaceImport.end });
+                                }
+                                return deleteRange(namespaceImport);
                             }
                     }
                     break;
 
                 case SyntaxKind.PropertyDeclaration:
                 case SyntaxKind.NamespaceImport:
-                    return createCodeFixToRemoveNode(token.parent);
+                    return deleteNode(token.parent);
             }
             if (isDeclarationName(token)) {
-                return createCodeFixToRemoveNode(token.parent);
+                return deleteNode(token.parent);
             }
             else if (isLiteralComputedPropertyDeclarationName(token)) {
-                return createCodeFixToRemoveNode(token.parent.parent);
+                return deleteNode(token.parent.parent);
             }
             else {
                 return undefined;
             }
 
-            function findImportDeclaration(token: Node): Node {
-                let importDecl = token;
-                while (importDecl.kind != SyntaxKind.ImportDeclaration && importDecl.parent) {
-                    importDecl = importDecl.parent;
-                }
-
-                return importDecl;
+            function deleteNode(n: Node) {
+                return makeChange(textChanges.ChangeTracker.fromCodeFixContext(context).deleteNode(sourceFile, n));
             }
 
-            function createCodeFixToRemoveNode(node: Node) {
-                let end = node.getEnd();
-                const endCharCode = sourceFile.text.charCodeAt(end);
-                const afterEndCharCode = sourceFile.text.charCodeAt(end + 1);
-                if (isLineBreak(endCharCode)) {
-                    end += 1;
-                }
-                // in the case of CR LF, you could have two consecutive new line characters for one new line.
-                // this needs to be differenciated from two LF LF chars that actually mean two new lines.
-                if (isLineBreak(afterEndCharCode) && endCharCode !== afterEndCharCode) {
-                    end += 1;
-                }
-
-                const start = node.getStart();
-                return createCodeFix("", start, end - start);
+            function deleteRange(range: TextRange) {
+                return makeChange(textChanges.ChangeTracker.fromCodeFixContext(context).deleteRange(sourceFile, range));
             }
 
-            function createCodeFix(newText: string, start: number, length: number): CodeAction[] {
+            function deleteNodeInList(n: Node) {
+                return makeChange(textChanges.ChangeTracker.fromCodeFixContext(context).deleteNodeInList(sourceFile, n));
+            }
+
+            function deleteNodeRange(start: Node, end: Node) {
+                return makeChange(textChanges.ChangeTracker.fromCodeFixContext(context).deleteNodeRange(sourceFile, start, end));
+            }
+
+            function replaceNode(n: Node, newNode: Node) {
+                return makeChange(textChanges.ChangeTracker.fromCodeFixContext(context).replaceNode(sourceFile, n, newNode));
+            }
+
+            function makeChange(changeTracker: textChanges.ChangeTracker) {
                 return [{
                     description: formatStringFromArgs(getLocaleSpecificMessage(Diagnostics.Remove_declaration_for_Colon_0), { 0: token.getText() }),
-                    changes: [{
-                        fileName: sourceFile.fileName,
-                        textChanges: [{ newText, span: { start, length } }]
-                    }]
+                    changes: changeTracker.getChanges()
                 }];
             }
-
-            function removeSingleItem<T extends Node>(elements: NodeArray<T>, token: T): CodeAction[] {
-                if (elements[0] === token.parent) {
-                    return createCodeFix("", token.parent.pos, token.parent.end - token.parent.pos + 1);
-                }
-                else {
-                    return createCodeFix("", token.parent.pos - 1, token.parent.end - token.parent.pos + 1);
-                }
-            }
         }
     });
 }
\ No newline at end of file
diff --git a/src/services/completions.ts b/src/services/completions.ts
index 525f1a8416c..738c8b3b8bd 100644
--- a/src/services/completions.ts
+++ b/src/services/completions.ts
@@ -447,8 +447,8 @@ namespace ts.Completions {
                 return undefined;
             }
 
-            const { parent, kind } = contextToken;
-            if (kind === SyntaxKind.DotToken) {
+            let parent = contextToken.parent;
+            if (contextToken.kind === SyntaxKind.DotToken) {
                 if (parent.kind === SyntaxKind.PropertyAccessExpression) {
                     node = (<PropertyAccessExpression>contextToken.parent).expression;
                     isRightOfDot = true;
@@ -464,16 +464,24 @@ namespace ts.Completions {
                 }
             }
             else if (sourceFile.languageVariant === LanguageVariant.JSX) {
-                switch (contextToken.parent.kind) {
+                // <UI.Test /* completion position */ />
+                // If the tagname is a property access expression, we will then walk up to the top most of property access expression.
+                // Then, try to get a JSX container and its associated attributes type.
+                if (parent && parent.kind === SyntaxKind.PropertyAccessExpression) {
+                    contextToken = parent;
+                    parent = parent.parent;
+                }
+
+                switch (parent.kind) {
                     case SyntaxKind.JsxClosingElement:
-                        if (kind === SyntaxKind.SlashToken) {
+                        if (contextToken.kind === SyntaxKind.SlashToken) {
                             isStartingCloseTag = true;
                             location = contextToken;
                         }
                         break;
 
                     case SyntaxKind.BinaryExpression:
-                        if (!((contextToken.parent as BinaryExpression).left.flags & NodeFlags.ThisNodeHasError)) {
+                        if (!((parent as BinaryExpression).left.flags & NodeFlags.ThisNodeHasError)) {
                             // It has a left-hand side, so we're not in an opening JSX tag.
                             break;
                         }
@@ -482,7 +490,7 @@ namespace ts.Completions {
                     case SyntaxKind.JsxSelfClosingElement:
                     case SyntaxKind.JsxElement:
                     case SyntaxKind.JsxOpeningElement:
-                        if (kind === SyntaxKind.LessThanToken) {
+                        if (contextToken.kind === SyntaxKind.LessThanToken) {
                             isRightOfOpenTag = true;
                             location = contextToken;
                         }
@@ -950,6 +958,7 @@ namespace ts.Completions {
                     case SyntaxKind.LessThanSlashToken:
                     case SyntaxKind.SlashToken:
                     case SyntaxKind.Identifier:
+                    case SyntaxKind.PropertyAccessExpression:
                     case SyntaxKind.JsxAttributes:
                     case SyntaxKind.JsxAttribute:
                     case SyntaxKind.JsxSpreadAttribute:
diff --git a/src/services/formatting/formatting.ts b/src/services/formatting/formatting.ts
index 201d64e4d7e..4fa3b71a3a2 100644
--- a/src/services/formatting/formatting.ts
+++ b/src/services/formatting/formatting.ts
@@ -314,24 +314,55 @@ namespace ts.formatting {
         return 0;
     }
 
+    /* @internal */
+    export function formatNode(node: Node, sourceFileLike: SourceFileLike, languageVariant: LanguageVariant, initialIndentation: number, delta: number,  rulesProvider: RulesProvider): TextChange[] {
+        const range = { pos: 0, end: sourceFileLike.text.length };
+        return formatSpanWorker(
+            range,
+            node,
+            initialIndentation,
+            delta,
+            getFormattingScanner(sourceFileLike.text, languageVariant, range.pos, range.end),
+            rulesProvider.getFormatOptions(),
+            rulesProvider,
+            FormattingRequestKind.FormatSelection,
+            _ => false, // assume that node does not have any errors
+            sourceFileLike);
+    }
+
     function formatSpan(originalRange: TextRange,
         sourceFile: SourceFile,
         options: FormatCodeSettings,
         rulesProvider: RulesProvider,
         requestKind: FormattingRequestKind): TextChange[] {
+        // find the smallest node that fully wraps the range and compute the initial indentation for the node
+        const enclosingNode = findEnclosingNode(originalRange, sourceFile);
+        return formatSpanWorker(
+            originalRange,
+            enclosingNode,
+            SmartIndenter.getIndentationForNode(enclosingNode, originalRange, sourceFile, options),
+            getOwnOrInheritedDelta(enclosingNode, options, sourceFile),
+            getFormattingScanner(sourceFile.text, sourceFile.languageVariant, getScanStartPosition(enclosingNode, originalRange, sourceFile), originalRange.end),
+            options,
+            rulesProvider,
+            requestKind,
+            prepareRangeContainsErrorFunction(sourceFile.parseDiagnostics, originalRange),
+            sourceFile);
+    }
 
-        const rangeContainsError = prepareRangeContainsErrorFunction(sourceFile.parseDiagnostics, originalRange);
+    function formatSpanWorker(originalRange: TextRange,
+        enclosingNode: Node,
+        initialIndentation: number,
+        delta: number,
+        formattingScanner: FormattingScanner,
+        options: FormatCodeSettings,
+        rulesProvider: RulesProvider,
+        requestKind: FormattingRequestKind,
+        rangeContainsError: (r: TextRange) => boolean,
+        sourceFile: SourceFileLike): TextChange[] {
 
         // formatting context is used by rules provider
         const formattingContext = new FormattingContext(sourceFile, requestKind);
-
-        // find the smallest node that fully wraps the range and compute the initial indentation for the node
-        const enclosingNode = findEnclosingNode(originalRange, sourceFile);
-
-        const formattingScanner = getFormattingScanner(sourceFile, getScanStartPosition(enclosingNode, originalRange, sourceFile), originalRange.end);
-
-        const initialIndentation = SmartIndenter.getIndentationForNode(enclosingNode, originalRange, sourceFile, options);
-
         let previousRangeHasError: boolean;
         let previousRange: TextRangeWithKind;
         let previousParent: Node;
@@ -351,7 +382,6 @@ namespace ts.formatting {
                 undecoratedStartLine = sourceFile.getLineAndCharacterOfPosition(getNonDecoratorTokenPosOfNode(enclosingNode, sourceFile)).line;
             }
 
-            const delta = getOwnOrInheritedDelta(enclosingNode, options, sourceFile);
             processNode(enclosingNode, enclosingNode, startLine, undecoratedStartLine, initialIndentation, delta);
         }
 
diff --git a/src/services/formatting/formattingContext.ts b/src/services/formatting/formattingContext.ts
index bd5ca352476..26b538dfc5e 100644
--- a/src/services/formatting/formattingContext.ts
+++ b/src/services/formatting/formattingContext.ts
@@ -15,7 +15,7 @@ namespace ts.formatting {
         private contextNodeBlockIsOnOneLine: boolean;
         private nextNodeBlockIsOnOneLine: boolean;
 
-        constructor(public sourceFile: SourceFile, public formattingRequestKind: FormattingRequestKind) {
+        constructor(public readonly sourceFile: SourceFileLike, public formattingRequestKind: FormattingRequestKind) {
         }
 
         public updateContext(currentRange: TextRangeWithKind, currentTokenParent: Node, nextRange: TextRangeWithKind, nextTokenParent: Node, commonParent: Node) {
diff --git a/src/services/formatting/formattingScanner.ts b/src/services/formatting/formattingScanner.ts
index 2020352f86b..20d190de2f3 100644
--- a/src/services/formatting/formattingScanner.ts
+++ b/src/services/formatting/formattingScanner.ts
@@ -30,11 +30,11 @@ namespace ts.formatting {
         RescanJsxText,
     }
 
-    export function getFormattingScanner(sourceFile: SourceFile, startPos: number, endPos: number): FormattingScanner {
+    export function getFormattingScanner(text: string, languageVariant: LanguageVariant, startPos: number, endPos: number): FormattingScanner {
         Debug.assert(scanner === undefined, "Scanner should be undefined");
-        scanner = sourceFile.languageVariant === LanguageVariant.JSX ? jsxScanner : standardScanner;
+        scanner = languageVariant === LanguageVariant.JSX ? jsxScanner : standardScanner;
 
-        scanner.setText(sourceFile.text);
+        scanner.setText(text);
         scanner.setTextPos(startPos);
 
         let wasNewLine = true;
@@ -276,8 +276,8 @@ namespace ts.formatting {
         function isOnToken(): boolean {
             Debug.assert(scanner !== undefined);
 
-            const current = (lastTokenInfo && lastTokenInfo.token.kind) || scanner.getToken();
-            const startPos = (lastTokenInfo && lastTokenInfo.token.pos) || scanner.getStartPos();
+            const current = lastTokenInfo ? lastTokenInfo.token.kind : scanner.getToken();
+            const startPos = lastTokenInfo ? lastTokenInfo.token.pos : scanner.getStartPos();
             return startPos < endPos && current !== SyntaxKind.EndOfFileToken && !isTrivia(current);
         }
 
diff --git a/src/services/formatting/rulesProvider.ts b/src/services/formatting/rulesProvider.ts
index 14e08e4857a..660d5f34a0e 100644
--- a/src/services/formatting/rulesProvider.ts
+++ b/src/services/formatting/rulesProvider.ts
@@ -24,6 +24,10 @@ namespace ts.formatting {
             return this.rulesMap;
         }
 
+        public getFormatOptions(): Readonly<ts.FormatCodeSettings> {
+            return this.options;
+        }
+
         public ensureUpToDate(options: ts.FormatCodeSettings) {
             if (!this.options || !ts.compareDataObjects(this.options, options)) {
                 const activeRules = this.createActiveRules(options);
diff --git a/src/services/formatting/smartIndenter.ts b/src/services/formatting/smartIndenter.ts
index eb9e1ba04c5..b5c901482a7 100644
--- a/src/services/formatting/smartIndenter.ts
+++ b/src/services/formatting/smartIndenter.ts
@@ -8,7 +8,19 @@ namespace ts.formatting {
             Unknown = -1
         }
 
-        export function getIndentation(position: number, sourceFile: SourceFile, options: EditorSettings): number {
+        /**
+         * Computed indentation for a given position in source file
+         * @param position - position in file
+         * @param sourceFile - target source file
+         * @param options - set of editor options that control indentation
+         * @param assumeNewLineBeforeCloseBrace - false when getIndentation is called on the text from the real source file.
+         * true - when we need to assume that position is on the newline. This is usefult for codefixes, i.e.
+         * function f() {
+         * |}
+         * when inserting some text after open brace we would like to get the value of indentation as if newline was already there.
+         * However by default indentation at position | will be 0 so 'assumeNewLineBeforeCloseBrace' allows to override this behavior,
+         */
+        export function getIndentation(position: number, sourceFile: SourceFile, options: EditorSettings, assumeNewLineBeforeCloseBrace = false): number {
             if (position > sourceFile.text.length) {
                 return getBaseIndentation(options); // past EOF
             }
@@ -71,13 +83,14 @@ namespace ts.formatting {
                 if (positionBelongsToNode(current, position, sourceFile) && shouldIndentChildNode(current, previous)) {
                     currentStart = getStartLineAndCharacterForNode(current, sourceFile);
 
-                    if (nextTokenIsCurlyBraceOnSameLineAsCursor(precedingToken, current, lineAtPosition, sourceFile)) {
-                        indentationDelta = 0;
+                    const nextTokenKind = nextTokenIsCurlyBraceOnSameLineAsCursor(precedingToken, current, lineAtPosition, sourceFile);
+                    if (nextTokenKind !== NextTokenKind.Unknown) {
+                        // handle cases when codefix is about to be inserted before the close brace
+                        indentationDelta = assumeNewLineBeforeCloseBrace && nextTokenKind === NextTokenKind.CloseBrace ? options.indentSize : 0;
                     }
                     else {
                         indentationDelta = lineAtPosition !== currentStart.line ? options.indentSize : 0;
                     }
-
                     break;
                 }
 
@@ -218,15 +231,21 @@ namespace ts.formatting {
             return findColumnForFirstNonWhitespaceCharacterInLine(currentLineAndChar, sourceFile, options);
         }
 
-        function nextTokenIsCurlyBraceOnSameLineAsCursor(precedingToken: Node, current: Node, lineAtPosition: number, sourceFile: SourceFile): boolean {
+        const enum NextTokenKind {
+            Unknown,
+            OpenBrace,
+            CloseBrace
+        }
+
+        function nextTokenIsCurlyBraceOnSameLineAsCursor(precedingToken: Node, current: Node, lineAtPosition: number, sourceFile: SourceFile): NextTokenKind {
             const nextToken = findNextToken(precedingToken, current);
             if (!nextToken) {
-                return false;
+                return NextTokenKind.Unknown;
             }
 
             if (nextToken.kind === SyntaxKind.OpenBraceToken) {
                 // open braces are always indented at the parent level
-                return true;
+                return NextTokenKind.OpenBrace;
             }
             else if (nextToken.kind === SyntaxKind.CloseBraceToken) {
                 // close braces are indented at the parent level if they are located on the same line with cursor
@@ -239,17 +258,17 @@ namespace ts.formatting {
                 // $}
 
                 const nextTokenStartLine = getStartLineAndCharacterForNode(nextToken, sourceFile).line;
-                return lineAtPosition === nextTokenStartLine;
+                return lineAtPosition === nextTokenStartLine ? NextTokenKind.CloseBrace : NextTokenKind.Unknown;
             }
 
-            return false;
+            return NextTokenKind.Unknown;
         }
 
-        function getStartLineAndCharacterForNode(n: Node, sourceFile: SourceFile): LineAndCharacter {
+        function getStartLineAndCharacterForNode(n: Node, sourceFile: SourceFileLike): LineAndCharacter {
             return sourceFile.getLineAndCharacterOfPosition(n.getStart(sourceFile));
         }
 
-        export function childStartsOnTheSameLineWithElseInIfStatement(parent: Node, child: TextRangeWithKind, childStartLine: number, sourceFile: SourceFile): boolean {
+        export function childStartsOnTheSameLineWithElseInIfStatement(parent: Node, child: TextRangeWithKind, childStartLine: number, sourceFile: SourceFileLike): boolean {
             if (parent.kind === SyntaxKind.IfStatement && (<IfStatement>parent).elseStatement === child) {
                 const elseKeyword = findChildOfKind(parent, SyntaxKind.ElseKeyword, sourceFile);
                 Debug.assert(elseKeyword !== undefined);
@@ -261,15 +280,15 @@ namespace ts.formatting {
             return false;
         }
 
-        function getContainingList(node: Node, sourceFile: SourceFile): NodeArray<Node> {
+        function getListIfStartEndIsInListRange(list: NodeArray<Node>, start: number, end: number) {
+            return list && rangeContainsStartEnd(list, start, end) ? list : undefined;
+        }
+
+        export function getContainingList(node: Node, sourceFile: SourceFile): NodeArray<Node> {
             if (node.parent) {
                 switch (node.parent.kind) {
                     case SyntaxKind.TypeReference:
-                        if ((<TypeReferenceNode>node.parent).typeArguments &&
-                            rangeContainsStartEnd((<TypeReferenceNode>node.parent).typeArguments, node.getStart(sourceFile), node.getEnd())) {
-                            return (<TypeReferenceNode>node.parent).typeArguments;
-                        }
-                        break;
+                        return getListIfStartEndIsInListRange((<TypeReferenceNode>node.parent).typeArguments, node.getStart(sourceFile), node.getEnd());
                     case SyntaxKind.ObjectLiteralExpression:
                         return (<ObjectLiteralExpression>node.parent).properties;
                     case SyntaxKind.ArrayLiteralExpression:
@@ -280,30 +299,26 @@ namespace ts.formatting {
                     case SyntaxKind.MethodDeclaration:
                     case SyntaxKind.MethodSignature:
                     case SyntaxKind.CallSignature:
+                    case SyntaxKind.Constructor:
+                    case SyntaxKind.ConstructorType:
                     case SyntaxKind.ConstructSignature: {
                         const start = node.getStart(sourceFile);
-                        if ((<SignatureDeclaration>node.parent).typeParameters &&
-                            rangeContainsStartEnd((<SignatureDeclaration>node.parent).typeParameters, start, node.getEnd())) {
-                            return (<SignatureDeclaration>node.parent).typeParameters;
-                        }
-                        if (rangeContainsStartEnd((<SignatureDeclaration>node.parent).parameters, start, node.getEnd())) {
-                            return (<SignatureDeclaration>node.parent).parameters;
-                        }
-                        break;
+                        return getListIfStartEndIsInListRange((<SignatureDeclaration>node.parent).typeParameters, start, node.getEnd()) ||
+                            getListIfStartEndIsInListRange((<SignatureDeclaration>node.parent).parameters, start, node.getEnd());
                     }
+                    case SyntaxKind.ClassDeclaration:
+                        return getListIfStartEndIsInListRange((<ClassDeclaration>node.parent).typeParameters, node.getStart(sourceFile), node.getEnd());
                     case SyntaxKind.NewExpression:
                     case SyntaxKind.CallExpression: {
                         const start = node.getStart(sourceFile);
-                        if ((<CallExpression>node.parent).typeArguments &&
-                            rangeContainsStartEnd((<CallExpression>node.parent).typeArguments, start, node.getEnd())) {
-                            return (<CallExpression>node.parent).typeArguments;
-                        }
-                        if ((<CallExpression>node.parent).arguments &&
-                            rangeContainsStartEnd((<CallExpression>node.parent).arguments, start, node.getEnd())) {
-                            return (<CallExpression>node.parent).arguments;
-                        }
-                        break;
+                        return getListIfStartEndIsInListRange((<CallExpression>node.parent).typeArguments, start, node.getEnd()) ||
+                            getListIfStartEndIsInListRange((<CallExpression>node.parent).arguments, start, node.getEnd());
                     }
+                    case SyntaxKind.VariableDeclarationList:
+                        return getListIfStartEndIsInListRange((<VariableDeclarationList>node.parent).declarations, node.getStart(sourceFile), node.getEnd());
+                    case SyntaxKind.NamedImports:
+                    case SyntaxKind.NamedExports:
+                        return getListIfStartEndIsInListRange((<NamedImportsOrExports>node.parent).elements, node.getStart(sourceFile), node.getEnd());
                 }
             }
             return undefined;
@@ -400,7 +415,7 @@ namespace ts.formatting {
             value of 'character' for '$' is 3
             value of 'column' for '$' is 6 (assuming that tab size is 4)
         */
-        export function findFirstNonWhitespaceCharacterAndColumn(startPos: number, endPos: number, sourceFile: SourceFile, options: EditorSettings) {
+        export function findFirstNonWhitespaceCharacterAndColumn(startPos: number, endPos: number, sourceFile: SourceFileLike, options: EditorSettings) {
             let character = 0;
             let column = 0;
             for (let pos = startPos; pos < endPos; pos++) {
@@ -421,7 +436,7 @@ namespace ts.formatting {
             return { column, character };
         }
 
-        export function findFirstNonWhitespaceColumn(startPos: number, endPos: number, sourceFile: SourceFile, options: EditorSettings): number {
+        export function findFirstNonWhitespaceColumn(startPos: number, endPos: number, sourceFile: SourceFileLike, options: EditorSettings): number {
             return findFirstNonWhitespaceCharacterAndColumn(startPos, endPos, sourceFile, options).column;
         }
 
diff --git a/src/services/jsDoc.ts b/src/services/jsDoc.ts
index d0cf8c0aec8..d993facbb1d 100644
--- a/src/services/jsDoc.ts
+++ b/src/services/jsDoc.ts
@@ -178,7 +178,8 @@ namespace ts.JsDoc {
         const posLineAndChar = sourceFile.getLineAndCharacterOfPosition(position);
         const lineStart = sourceFile.getLineStarts()[posLineAndChar.line];
 
-        const indentationStr = sourceFile.text.substr(lineStart, posLineAndChar.character);
+        // replace non-whitespace characters in prefix with spaces.
+        const indentationStr = sourceFile.text.substr(lineStart, posLineAndChar.character).replace(/\S/i, () => " ");
         const isJavaScriptFile = hasJavaScriptFileExtension(sourceFile.fileName);
 
         let docParams = "";
diff --git a/src/services/services.ts b/src/services/services.ts
index 24744c0d204..4f51d46a816 100644
--- a/src/services/services.ts
+++ b/src/services/services.ts
@@ -24,6 +24,7 @@
 /// <reference path='transpile.ts' />
 /// <reference path='formatting\formatting.ts' />
 /// <reference path='formatting\smartIndenter.ts' />
+/// <reference path='textChanges.ts' />
 /// <reference path='codeFixProvider.ts' />
 /// <reference path='codefixes\fixes.ts' />
 
@@ -63,7 +64,7 @@ namespace ts {
             return getSourceFileOfNode(this);
         }
 
-        public getStart(sourceFile?: SourceFile, includeJsDocComment?: boolean): number {
+        public getStart(sourceFile?: SourceFileLike, includeJsDocComment?: boolean): number {
             return getTokenPosOfNode(this, sourceFile, includeJsDocComment);
         }
 
@@ -129,7 +130,7 @@ namespace ts {
             return list;
         }
 
-        private createChildren(sourceFile?: SourceFile) {
+        private createChildren(sourceFile?: SourceFileLike) {
             let children: Node[];
             if (this.kind >= SyntaxKind.FirstNode) {
                 scanner.setText((sourceFile || this.getSourceFile()).text);
@@ -182,7 +183,7 @@ namespace ts {
             return this._children[index];
         }
 
-        public getChildren(sourceFile?: SourceFile): Node[] {
+        public getChildren(sourceFile?: SourceFileLike): Node[] {
             if (!this._children) this.createChildren(sourceFile);
             return this._children;
         }
@@ -231,7 +232,7 @@ namespace ts {
             return getSourceFileOfNode(this);
         }
 
-        public getStart(sourceFile?: SourceFile, includeJsDocComment?: boolean): number {
+        public getStart(sourceFile?: SourceFileLike, includeJsDocComment?: boolean): number {
             return getTokenPosOfNode(this, sourceFile, includeJsDocComment);
         }
 
@@ -1683,7 +1684,7 @@ namespace ts {
             return [];
         }
 
-        function getCodeFixesAtPosition(fileName: string, start: number, end: number, errorCodes: number[]): CodeAction[] {
+        function getCodeFixesAtPosition(fileName: string, start: number, end: number, errorCodes: number[], formatOptions: FormatCodeSettings): CodeAction[] {
             synchronizeHostData();
             const sourceFile = getValidSourceFile(fileName);
             const span = { start, length: end - start };
@@ -1701,7 +1702,8 @@ namespace ts {
                     program: program,
                     newLineCharacter: newLineChar,
                     host: host,
-                    cancellationToken: cancellationToken
+                    cancellationToken: cancellationToken,
+                    rulesProvider: getRuleProvider(formatOptions)
                 };
 
                 const fixes = codefix.getFixes(context);
diff --git a/src/services/textChanges.ts b/src/services/textChanges.ts
new file mode 100644
index 00000000000..6f8a67a0535
--- /dev/null
+++ b/src/services/textChanges.ts
@@ -0,0 +1,666 @@
+/* @internal */
+namespace ts.textChanges {
+
+    /**
+     * Currently for simplicity we store recovered positions on the node itself.
+     * It can be changed to side-table later if we decide that current design is too invasive.
+     */
+    function getPos(n: TextRange) {
+        return (<any>n)["__pos"];
+    }
+
+    function setPos(n: TextRange, pos: number) {
+        (<any>n)["__pos"] = pos;
+    }
+
+    function getEnd(n: TextRange) {
+        return (<any>n)["__end"];
+    }
+
+    function setEnd(n: TextRange, end: number) {
+        (<any>n)["__end"] = end;
+    }
+
+    export interface ConfigurableStart {
+        useNonAdjustedStartPosition?: boolean;
+    }
+    export interface ConfigurableEnd {
+        useNonAdjustedEndPosition?: boolean;
+    }
+
+    export enum Position {
+        FullStart,
+        Start
+    }
+
+    function skipWhitespacesAndLineBreaks(text: string, start: number) {
+        return skipTrivia(text, start, /*stopAfterLineBreak*/ false, /*stopAtComments*/ true);
+    }
+
+    function hasCommentsBeforeLineBreak(text: string, start: number) {
+        let i = start;
+        while (i < text.length) {
+            const ch = text.charCodeAt(i);
+            if (isWhiteSpaceSingleLine(ch)) {
+                i++;
+                continue;
+            }
+            return ch === CharacterCodes.slash;
+        }
+        return false;
+    }
+
+    /**
+     * Usually node.pos points to a position immediately after the previous token.
+     * If this position is used as a beginning of the span to remove - it might lead to removing the trailing trivia of the previous node, i.e:
+     * const x; // this is x
+     *        ^ - pos for the next variable declaration will point here
+     * const y; // this is y
+     *        ^ - end for previous variable declaration
+     * Usually leading trivia of the variable declaration 'y' should not include trailing trivia (whitespace, comment 'this is x' and newline) from the preceding 
+     * variable declaration and trailing trivia for 'y' should include (whitespace, comment 'this is y', newline).
+     * By default when removing nodes we adjust start and end positions to respect specification of the trivia above.
+     * If pos\end should be interpreted literally 'useNonAdjustedStartPosition' or 'useNonAdjustedEndPosition' should be set to true
+     */
+    export type ConfigurableStartEnd = ConfigurableStart & ConfigurableEnd;
+
+    export interface InsertNodeOptions {
+        /**
+         * Text to be inserted before the new node
+         */
+        prefix?: string;
+        /**
+         * Text to be inserted after the new node
+         */
+        suffix?: string;
+        /**
+         * Text of inserted node will be formatted with this indentation, otherwise indentation will be inferred from the old node
+         */
+        indentation?: number;
+        /**
+         * Text of inserted node will be formatted with this delta, otherwise delta will be inferred from the new node kind
+         */
+        delta?: number;
+    }
+
+    export type ChangeNodeOptions = ConfigurableStartEnd & InsertNodeOptions;
+
+    interface Change {
+        readonly sourceFile: SourceFile;
+        readonly range: TextRange;
+        readonly useIndentationFromFile?: boolean;
+        readonly node?: Node;
+        readonly options?: ChangeNodeOptions;
+    }
+
+    export function getSeparatorCharacter(separator: Token<SyntaxKind.CommaToken | SyntaxKind.SemicolonToken>) {
+        return tokenToString(separator.kind);
+    }
+
+    export function getAdjustedStartPosition(sourceFile: SourceFile, node: Node, options: ConfigurableStart, position: Position) {
+        if (options.useNonAdjustedStartPosition) {
+            return node.getFullStart();
+        }
+        const fullStart = node.getFullStart();
+        const start = node.getStart(sourceFile);
+        if (fullStart === start) {
+            return start;
+        }
+        const fullStartLine = getLineStartPositionForPosition(fullStart, sourceFile);
+        const startLine = getLineStartPositionForPosition(start, sourceFile);
+        if (startLine === fullStartLine) {
+            // full start and start of the node are on the same line
+            //   a,     b;
+            //    ^     ^
+            //    |   start
+            // fullstart
+            // when b is replaced - we usually want to keep the leading trvia
+            // when b is deleted - we delete it
+            return position === Position.Start ? start : fullStart;
+        }
+        // get start position of the line following the line that contains fullstart position
+        let adjustedStartPosition = getStartPositionOfLine(getLineOfLocalPosition(sourceFile, fullStartLine) + 1, sourceFile);
+        // skip whitespaces/newlines
+        adjustedStartPosition = skipWhitespacesAndLineBreaks(sourceFile.text, adjustedStartPosition);
+        return getStartPositionOfLine(getLineOfLocalPosition(sourceFile, adjustedStartPosition), sourceFile);
+    }
+
+    export function getAdjustedEndPosition(sourceFile: SourceFile, node: Node, options: ConfigurableEnd) {
+        if (options.useNonAdjustedEndPosition) {
+            return node.getEnd();
+        }
+        const end = node.getEnd();
+        const newEnd = skipTrivia(sourceFile.text, end, /*stopAfterLineBreak*/ true);
+        // check if last character before newPos is linebreak
+        // if yes - considered all skipped trivia to be trailing trivia of the node
+        return newEnd !== end && isLineBreak(sourceFile.text.charCodeAt(newEnd - 1))
+            ? newEnd
+            : end;
+    }
+
+    /**
+     * Checks if 'candidate' argument is a legal separator in the list that contains 'node' as an element
+     */
+    function isSeparator(node: Node, candidate: Node): candidate is Token<SyntaxKind.CommaToken | SyntaxKind.SemicolonToken> {
+        return candidate && node.parent && (candidate.kind === SyntaxKind.CommaToken || (candidate.kind === SyntaxKind.SemicolonToken && node.parent.kind === SyntaxKind.ObjectLiteralExpression));
+    }
+
+    function spaces(count: number) {
+        let s = "";
+        for (let i = 0; i < count; i++) {
+            s += " ";
+        }
+        return s;
+    }
+
+    export class ChangeTracker {
+        private changes: Change[] = [];
+        private readonly newLineCharacter: string;
+
+        public static fromCodeFixContext(context: CodeFixContext) {
+            return new ChangeTracker(context.newLineCharacter === "\n" ? NewLineKind.LineFeed : NewLineKind.CarriageReturnLineFeed, context.rulesProvider);
+        }
+
+        constructor(
+            private readonly newLine: NewLineKind,
+            private readonly rulesProvider: formatting.RulesProvider,
+            private readonly validator?: (text: NonFormattedText) => void) {
+            this.newLineCharacter = getNewLineCharacter({ newLine });
+        }
+
+        public deleteNode(sourceFile: SourceFile, node: Node, options: ConfigurableStartEnd = {}) {
+            const startPosition = getAdjustedStartPosition(sourceFile, node, options, Position.FullStart);
+            const endPosition = getAdjustedEndPosition(sourceFile, node, options);
+            this.changes.push({ sourceFile, options, range: { pos: startPosition, end: endPosition } });
+            return this;
+        }
+
+        public deleteRange(sourceFile: SourceFile, range: TextRange) {
+            this.changes.push({ sourceFile, range });
+            return this;
+        }
+
+        public deleteNodeRange(sourceFile: SourceFile, startNode: Node, endNode: Node, options: ConfigurableStartEnd = {}) {
+            const startPosition = getAdjustedStartPosition(sourceFile, startNode, options, Position.FullStart);
+            const endPosition = getAdjustedEndPosition(sourceFile, endNode, options);
+            this.changes.push({ sourceFile, options, range: { pos: startPosition, end: endPosition } });
+            return this;
+        }
+
+        public deleteNodeInList(sourceFile: SourceFile, node: Node) {
+            const containingList = formatting.SmartIndenter.getContainingList(node, sourceFile);
+            if (!containingList) {
+                Debug.fail("node is not a list element");
+                return this;
+            }
+            const index = containingList.indexOf(node);
+            if (index < 0) {
+                return this;
+            }
+            if (containingList.length === 1) {
+                this.deleteNode(sourceFile, node);
+                return this;
+            }
+            if (index !== containingList.length - 1) {
+                const nextToken = getTokenAtPosition(sourceFile, node.end);
+                if (nextToken && isSeparator(node, nextToken)) {
+                    // find first non-whitespace position in the leading trivia of the node
+                    const startPosition = skipTrivia(sourceFile.text, getAdjustedStartPosition(sourceFile, node, {}, Position.FullStart), /*stopAfterLineBreak*/ false, /*stopAtComments*/ true);
+                    const nextElement = containingList[index + 1];
+                    /// find first non-whitespace position in the leading trivia of the next node
+                    const endPosition = skipTrivia(sourceFile.text, getAdjustedStartPosition(sourceFile, nextElement, {}, Position.FullStart), /*stopAfterLineBreak*/ false, /*stopAtComments*/ true);
+                    // shift next node so its first non-whitespace position will be moved to the first non-whitespace position of the deleted node
+                    this.deleteRange(sourceFile, { pos: startPosition, end: endPosition });
+                }
+            }
+            else {
+                const previousToken = getTokenAtPosition(sourceFile, containingList[index - 1].end);
+                if (previousToken && isSeparator(node, previousToken)) {
+                    this.deleteNodeRange(sourceFile, previousToken, node);
+                }
+            }
+            return this;
+        }
+
+        public replaceRange(sourceFile: SourceFile, range: TextRange, newNode: Node, options: InsertNodeOptions = {}) {
+            this.changes.push({ sourceFile, range, options, node: newNode });
+            return this;
+        }
+
+        public replaceNode(sourceFile: SourceFile, oldNode: Node, newNode: Node, options: ChangeNodeOptions = {}) {
+            const startPosition = getAdjustedStartPosition(sourceFile, oldNode, options, Position.Start);
+            const endPosition = getAdjustedEndPosition(sourceFile, oldNode, options);
+            this.changes.push({ sourceFile, options, useIndentationFromFile: true, node: newNode, range: { pos: startPosition, end: endPosition } });
+            return this;
+        }
+
+        public replaceNodeRange(sourceFile: SourceFile, startNode: Node, endNode: Node, newNode: Node, options: ChangeNodeOptions = {}) {
+            const startPosition = getAdjustedStartPosition(sourceFile, startNode, options, Position.Start);
+            const endPosition = getAdjustedEndPosition(sourceFile, endNode, options);
+            this.changes.push({ sourceFile, options, useIndentationFromFile: true, node: newNode, range: { pos: startPosition, end: endPosition } });
+            return this;
+        }
+
+        public insertNodeAt(sourceFile: SourceFile, pos: number, newNode: Node, options: InsertNodeOptions = {}) {
+            this.changes.push({ sourceFile, options, node: newNode, range: { pos: pos, end: pos } });
+            return this;
+        }
+
+        public insertNodeBefore(sourceFile: SourceFile, before: Node, newNode: Node, options: InsertNodeOptions & ConfigurableStart = {}) {
+            const startPosition = getAdjustedStartPosition(sourceFile, before, options, Position.Start);
+            this.changes.push({ sourceFile, options, useIndentationFromFile: true, node: newNode, range: { pos: startPosition, end: startPosition } });
+            return this;
+        }
+
+        public insertNodeAfter(sourceFile: SourceFile, after: Node, newNode: Node, options: InsertNodeOptions & ConfigurableEnd = {}) {
+            if ((isStatementButNotDeclaration(after)) ||
+                 after.kind === SyntaxKind.PropertyDeclaration ||
+                 after.kind === SyntaxKind.PropertySignature ||
+                 after.kind === SyntaxKind.MethodSignature) {
+                // check if previous statement ends with semicolon
+                // if not - insert semicolon to preserve the code from changing the meaning due to ASI
+                if (sourceFile.text.charCodeAt(after.end - 1) !== CharacterCodes.semicolon) {
+                    this.changes.push({
+                        sourceFile,
+                        options: {},
+                        range: { pos: after.end, end: after.end },
+                        node: createToken(SyntaxKind.SemicolonToken)
+                    })
+                }
+            }
+            const endPosition = getAdjustedEndPosition(sourceFile, after, options);
+            this.changes.push({ sourceFile, options, useIndentationFromFile: true, node: newNode, range: { pos: endPosition, end: endPosition } });
+            return this;
+        }
+
+        /**
+         * This function should be used to insert nodes in lists when nodes  don't carry separators as the part of the node range,
+         * i.e. arguments in arguments lists, parameters in parameter lists etc. Statements or class elements are different in sense that 
+         * for them separators are treated as the part of the node.
+         */
+        public insertNodeInListAfter(sourceFile: SourceFile, after: Node, newNode: Node) {
+            const containingList = formatting.SmartIndenter.getContainingList(after, sourceFile);
+            if (!containingList) {
+                Debug.fail("node is not a list element");
+                return this;
+            }
+            const index = containingList.indexOf(after);
+            if (index < 0) {
+                return this;
+            }
+            const end = after.getEnd();
+            if (index !== containingList.length - 1) {
+                // any element except the last one
+                // use next sibling as an anchor
+                const nextToken = getTokenAtPosition(sourceFile, after.end);
+                if (nextToken && isSeparator(after, nextToken)) {
+                    // for list
+                    // a, b, c
+                    // create change for adding 'e' after 'a' as
+                    // - find start of next element after a (it is b)
+                    // - use this start as start and end position in final change
+                    // - build text of change by formatting the text of node + separator + whitespace trivia of b
+
+                    // in multiline case it will work as
+                    //   a,
+                    //   b,
+                    //   c,
+                    // result - '*' denotes leading trivia that will be inserted after new text (displayed as '#')
+                    //   a,*
+                    //***insertedtext<separator>#
+                    //###b,
+                    //   c,
+                    // find line and character of the next element
+                    const lineAndCharOfNextElement = getLineAndCharacterOfPosition(sourceFile, skipWhitespacesAndLineBreaks(sourceFile.text, containingList[index + 1].getFullStart()));
+                    // find line and character of the token that precedes next element (usually it is separator)
+                    const lineAndCharOfNextToken = getLineAndCharacterOfPosition(sourceFile, nextToken.end);
+                    let prefix: string;
+                    let startPos: number;
+                    if (lineAndCharOfNextToken.line === lineAndCharOfNextElement.line) {
+                        // next element is located on the same line with separator: 
+                        // a,$$$$b
+                        //  ^    ^
+                        //  |    |-next element
+                        //  |-separator
+                        // where $$$ is some leading trivia
+                        // for a newly inserted node we'll maintain the same relative position comparing to separator and replace leading trivia with spaces
+                        // a,    x,$$$$b
+                        //  ^    ^     ^
+                        //  |    |     |-next element
+                        //  |    |-new inserted node padded with spaces
+                        //  |-separator
+                        startPos = nextToken.end;
+                        prefix = spaces(lineAndCharOfNextElement.character - lineAndCharOfNextToken.character);
+                    }
+                    else {
+                        // next element is located on different line that separator
+                        // let insert position be the beginning of the line that contains next element
+                        startPos = getStartPositionOfLine(lineAndCharOfNextElement.line, sourceFile);
+                    }
+
+                    this.changes.push({
+                        sourceFile,
+                        range: { pos: startPos, end: containingList[index + 1].getStart(sourceFile) },
+                        node: newNode,
+                        useIndentationFromFile: true,
+                        options: {
+                            prefix,
+                            // write separator and leading trivia of the next element as suffix
+                            suffix: `${tokenToString(nextToken.kind)}${sourceFile.text.substring(nextToken.end, containingList[index + 1].getStart(sourceFile))}`
+                        }
+                    });
+                }
+            }
+            else {
+                const afterStart = after.getStart(sourceFile);
+                const afterStartLinePosition = getLineStartPositionForPosition(afterStart, sourceFile);
+
+                let separator: SyntaxKind.CommaToken | SyntaxKind.SemicolonToken;
+                let multilineList = false;
+
+                // insert element after the last element in the list that has more than one item
+                // pick the element preceding the after element to:
+                // - pick the separator
+                // - determine if list is a multiline
+                if (containingList.length === 1) {
+                    // if list has only one element then we'll format is as multiline if node has comment in trailing trivia, or as singleline otherwise
+                    // i.e. var x = 1 // this is x
+                    //     | new element will be inserted at this position
+                    separator = SyntaxKind.CommaToken;
+                }
+                else {
+                    // element has more than one element, pick separator from the list
+                    const tokenBeforeInsertPosition = findPrecedingToken(after.pos, sourceFile);
+                    separator = isSeparator(after, tokenBeforeInsertPosition) ? tokenBeforeInsertPosition.kind : SyntaxKind.CommaToken;
+                    // determine if list is multiline by checking lines of after element and element that precedes it.
+                    const afterMinusOneStartLinePosition = getLineStartPositionForPosition(containingList[index - 1].getStart(sourceFile), sourceFile);
+                    multilineList = afterMinusOneStartLinePosition !== afterStartLinePosition;
+                }
+                if (hasCommentsBeforeLineBreak(sourceFile.text, after.end)) {
+                    // in this case we'll always treat containing list as multiline
+                    multilineList = true;
+                }
+                if (multilineList) {
+                    // insert separator immediately following the 'after' node to preserve comments in trailing trivia
+                    this.changes.push({
+                        sourceFile,
+                        range: { pos: end, end },
+                        node: createToken(separator),
+                        options: {}
+                    });
+                    // use the same indentation as 'after' item
+                    const indentation = formatting.SmartIndenter.findFirstNonWhitespaceColumn(afterStartLinePosition, afterStart, sourceFile, this.rulesProvider.getFormatOptions());
+                    // insert element before the line break on the line that contains 'after' element
+                    let insertPos = skipTrivia(sourceFile.text, end, /*stopAfterLineBreak*/ true, /*stopAtComments*/ false);
+                    if (insertPos !== end && isLineBreak(sourceFile.text.charCodeAt(insertPos - 1))) {
+                        insertPos--
+                    }
+                    this.changes.push({
+                        sourceFile,
+                        range: { pos: insertPos, end: insertPos },
+                        node: newNode,
+                        options: { indentation, prefix: this.newLineCharacter }
+                    });
+                }
+                else {
+                    this.changes.push({
+                        sourceFile,
+                        range: { pos: end, end },
+                        node: newNode,
+                        options: { prefix: `${tokenToString(separator)} ` }
+                    });
+                }
+            }
+            return this;
+        }
+
+        public getChanges(): FileTextChanges[] {
+            const changesPerFile = createFileMap<Change[]>();
+            // group changes per file
+            for (const c of this.changes) {
+                let changesInFile = changesPerFile.get(c.sourceFile.path);
+                if (!changesInFile) {
+                    changesPerFile.set(c.sourceFile.path, changesInFile = []);
+                };
+                changesInFile.push(c);
+            }
+            // convert changes
+            const fileChangesList: FileTextChanges[] = [];
+            changesPerFile.forEachValue(path => {
+                const changesInFile = changesPerFile.get(path);
+                const sourceFile = changesInFile[0].sourceFile;
+                const fileTextChanges: FileTextChanges = { fileName: sourceFile.fileName, textChanges: [] };
+                for (const c of ChangeTracker.normalize(changesInFile)) {
+                    fileTextChanges.textChanges.push({
+                        span: this.computeSpan(c, sourceFile),
+                        newText: this.computeNewText(c, sourceFile)
+                    });
+                }
+                fileChangesList.push(fileTextChanges);
+            });
+
+            return fileChangesList;
+        }
+
+        private computeSpan(change: Change, _sourceFile: SourceFile): TextSpan {
+            return createTextSpanFromBounds(change.range.pos, change.range.end);
+        }
+
+        private computeNewText(change: Change, sourceFile: SourceFile): string {
+            if (!change.node) {
+                // deletion case
+                return "";
+            }
+            const options = change.options || {};
+            const nonFormattedText = getNonformattedText(change.node, sourceFile, this.newLine);
+            if (this.validator) {
+                this.validator(nonFormattedText);
+            }
+
+            const formatOptions = this.rulesProvider.getFormatOptions();
+            const pos = change.range.pos;
+            const posStartsLine = getLineStartPositionForPosition(pos, sourceFile) === pos;
+
+            const initialIndentation =
+                change.options.indentation !== undefined
+                    ? change.options.indentation
+                    : change.useIndentationFromFile
+                        ? formatting.SmartIndenter.getIndentation(change.range.pos, sourceFile, formatOptions, posStartsLine || (change.options.prefix == this.newLineCharacter))
+                        : 0;
+            const delta =
+                change.options.delta !== undefined
+                    ? change.options.delta
+                    : formatting.SmartIndenter.shouldIndentChildNode(change.node)
+                        ? formatOptions.indentSize
+                        : 0;
+
+            let text = applyFormatting(nonFormattedText, sourceFile, initialIndentation, delta, this.rulesProvider);
+            // strip initial indentation (spaces or tabs) if text will be inserted in the middle of the line
+            // however keep indentation if it is was forced
+            text = posStartsLine || change.options.indentation !== undefined ? text : text.replace(/^\s+/, "");
+            return (options.prefix || "") + text + (options.suffix || "");
+        }
+
+        private static normalize(changes: Change[]) {
+            // order changes by start position
+            const normalized = stableSort(changes, (a, b) => a.range.pos - b.range.pos);
+            // verify that end position of the change is less than start position of the next change
+            for (let i = 0; i < normalized.length - 2; i++) {
+                Debug.assert(normalized[i].range.end <= normalized[i + 1].range.pos);
+            }
+            return normalized;
+        }
+    }
+
+    export interface NonFormattedText {
+        readonly text: string;
+        readonly node: Node;
+    }
+
+    export function getNonformattedText(node: Node, sourceFile: SourceFile, newLine: NewLineKind): NonFormattedText {
+        const options = { newLine, target: sourceFile.languageVersion };
+        const writer = new Writer(getNewLineCharacter(options));
+        const printer = createPrinter(options, writer);
+        printer.writeNode(EmitHint.Unspecified, node, sourceFile, writer);
+        return { text: writer.getText(), node: assignPositionsToNode(node) };
+    }
+
+    export function applyFormatting(nonFormattedText: NonFormattedText, sourceFile: SourceFile, initialIndentation: number, delta: number, rulesProvider: formatting.RulesProvider) {
+        const lineMap = computeLineStarts(nonFormattedText.text);
+        const file: SourceFileLike = {
+            text: nonFormattedText.text,
+            lineMap,
+            getLineAndCharacterOfPosition: pos => computeLineAndCharacterOfPosition(lineMap, pos)
+        };
+        const changes = formatting.formatNode(nonFormattedText.node, file, sourceFile.languageVariant, initialIndentation, delta, rulesProvider);
+        return applyChanges(nonFormattedText.text, changes);
+    }
+
+    export function applyChanges(text: string, changes: TextChange[]): string {
+        for (let i = changes.length - 1; i >= 0; i--) {
+            const change = changes[i];
+            text = `${text.substring(0, change.span.start)}${change.newText}${text.substring(textSpanEnd(change.span))}`;
+        }
+        return text;
+    }
+
+    function isTrivia(s: string) {
+        return skipTrivia(s, 0) === s.length;
+    }
+
+    const nullTransformationContext: TransformationContext = {
+        enableEmitNotification: noop,
+        enableSubstitution: noop,
+        endLexicalEnvironment: () => undefined,
+        getCompilerOptions: notImplemented,
+        getEmitHost: notImplemented,
+        getEmitResolver: notImplemented,
+        hoistFunctionDeclaration: noop,
+        hoistVariableDeclaration: noop,
+        isEmitNotificationEnabled: notImplemented,
+        isSubstitutionEnabled: notImplemented,
+        onEmitNode: noop,
+        onSubstituteNode: notImplemented,
+        readEmitHelpers: notImplemented,
+        requestEmitHelper: noop,
+        resumeLexicalEnvironment: noop,
+        startLexicalEnvironment: noop,
+        suspendLexicalEnvironment: noop
+    };
+
+    function assignPositionsToNode(node: Node): Node {
+        const visited = visitEachChild(node, assignPositionsToNode, nullTransformationContext, assignPositionsToNodeArray);
+        // create proxy node for non synthesized nodes
+        const newNode = nodeIsSynthesized(visited)
+            ? visited
+            : (Proxy.prototype = visited, new (<any>Proxy)());
+        newNode.pos = getPos(node);
+        newNode.end = getEnd(node);
+        return newNode;
+
+        function Proxy() { }
+    }
+
+    function assignPositionsToNodeArray(nodes: NodeArray<any>, visitor: Visitor, test?: (node: Node) => boolean, start?: number, count?: number) {
+        const visited = visitNodes(nodes, visitor, test, start, count);
+        if (!visited) {
+            return visited;
+        }
+        // clone nodearray if necessary
+        const nodeArray = visited === nodes ? createNodeArray(visited.slice(0)) : visited;
+        nodeArray.pos = getPos(nodes);
+        nodeArray.end = getEnd(nodes);
+        return nodeArray;
+    }
+
+    class Writer implements EmitTextWriter, PrintHandlers {
+        private lastNonTriviaPosition = 0;
+        private readonly writer: EmitTextWriter;
+
+        public readonly onEmitNode: PrintHandlers["onEmitNode"];
+        public readonly onBeforeEmitNodeArray: PrintHandlers["onBeforeEmitNodeArray"];
+        public readonly onAfterEmitNodeArray: PrintHandlers["onAfterEmitNodeArray"];
+
+        constructor(newLine: string) {
+            this.writer = createTextWriter(newLine);
+            this.onEmitNode = (hint, node, printCallback) => {
+                if (node) {
+                    setPos(node, this.lastNonTriviaPosition);
+                }
+                printCallback(hint, node);
+                if (node) {
+                    setEnd(node, this.lastNonTriviaPosition);
+                }
+            };
+            this.onBeforeEmitNodeArray = nodes => {
+                if (nodes) {
+                    setPos(nodes, this.lastNonTriviaPosition);
+                }
+            };
+            this.onAfterEmitNodeArray = nodes => {
+                if (nodes) {
+                    setEnd(nodes, this.lastNonTriviaPosition);
+                }
+            };
+        }
+
+        private setLastNonTriviaPosition(s: string, force: boolean) {
+            if (force || !isTrivia(s)) {
+                this.lastNonTriviaPosition = this.writer.getTextPos();
+                let i = 0;
+                while (isWhiteSpace(s.charCodeAt(s.length - i - 1))) {
+                    i++;
+                }
+                // trim trailing whitespaces
+                this.lastNonTriviaPosition -= i;
+            }
+        }
+
+        write(s: string): void {
+            this.writer.write(s);
+            this.setLastNonTriviaPosition(s, /*force*/ false);
+        }
+        writeTextOfNode(text: string, node: Node): void {
+            this.writer.writeTextOfNode(text, node);
+        }
+        writeLine(): void {
+            this.writer.writeLine();
+        }
+        increaseIndent(): void {
+            this.writer.increaseIndent();
+        }
+        decreaseIndent(): void {
+            this.writer.decreaseIndent();
+        }
+        getText(): string {
+            return this.writer.getText();
+        }
+        rawWrite(s: string): void {
+            this.writer.rawWrite(s);
+            this.setLastNonTriviaPosition(s, /*force*/ false);
+        }
+        writeLiteral(s: string): void {
+            this.writer.writeLiteral(s);
+            this.setLastNonTriviaPosition(s, /*force*/ true);
+        }
+        getTextPos(): number {
+            return this.writer.getTextPos();
+        }
+        getLine(): number {
+            return this.writer.getLine();
+        }
+        getColumn(): number {
+            return this.writer.getColumn();
+        }
+        getIndent(): number {
+            return this.writer.getIndent();
+        }
+        isAtStartOfLine(): boolean {
+            return this.writer.isAtStartOfLine();
+        }
+        reset(): void {
+            this.writer.reset();
+            this.lastNonTriviaPosition = 0;
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/services/tsconfig.json b/src/services/tsconfig.json
index b97b3c509f8..6b40c71e204 100644
--- a/src/services/tsconfig.json
+++ b/src/services/tsconfig.json
@@ -63,6 +63,7 @@
         "shims.ts",
         "signatureHelp.ts",
         "symbolDisplay.ts",
+        "textChanges.ts",
         "formatting/formatting.ts",
         "formatting/formattingContext.ts",
         "formatting/formattingRequestKind.ts",
diff --git a/src/services/types.ts b/src/services/types.ts
index c7852db6d6e..149bb4340dc 100644
--- a/src/services/types.ts
+++ b/src/services/types.ts
@@ -4,7 +4,11 @@ namespace ts {
         getChildCount(sourceFile?: SourceFile): number;
         getChildAt(index: number, sourceFile?: SourceFile): Node;
         getChildren(sourceFile?: SourceFile): Node[];
+        /* @internal */
+        getChildren(sourceFile?: SourceFileLike): Node[];
         getStart(sourceFile?: SourceFile, includeJsDocComment?: boolean): number;
+        /* @internal */
+        getStart(sourceFile?: SourceFileLike, includeJsDocComment?: boolean): number;
         getFullStart(): number;
         getEnd(): number;
         getWidth(sourceFile?: SourceFile): number;
@@ -59,6 +63,10 @@ namespace ts {
         update(newText: string, textChangeRange: TextChangeRange): SourceFile;
     }
 
+    export interface SourceFileLike {
+        getLineAndCharacterOfPosition(pos: number): LineAndCharacter;
+    }
+
     /**
      * Represents an immutable snapshot of a script at a specified time.Once acquired, the
      * snapshot is observably immutable. i.e. the same calls with the same parameters will return
@@ -248,7 +256,7 @@ namespace ts {
 
         isValidBraceCompletionAtPosition(fileName: string, position: number, openingBrace: number): boolean;
 
-        getCodeFixesAtPosition(fileName: string, start: number, end: number, errorCodes: number[]): CodeAction[];
+        getCodeFixesAtPosition(fileName: string, start: number, end: number, errorCodes: number[], formatOptions: FormatCodeSettings): CodeAction[];
 
         getEmitOutput(fileName: string, emitOnlyDtsFiles?: boolean): EmitOutput;
 
diff --git a/src/services/utilities.ts b/src/services/utilities.ts
index c894df121f8..de062d312c9 100644
--- a/src/services/utilities.ts
+++ b/src/services/utilities.ts
@@ -394,8 +394,8 @@ namespace ts {
         list: Node;
     }
 
-    export function getLineStartPositionForPosition(position: number, sourceFile: SourceFile): number {
-        const lineStarts = sourceFile.getLineStarts();
+    export function getLineStartPositionForPosition(position: number, sourceFile: SourceFileLike): number {
+        const lineStarts = getLineStarts(sourceFile);
         const line = sourceFile.getLineAndCharacterOfPosition(position).line;
         return lineStarts[line];
     }
@@ -604,7 +604,7 @@ namespace ts {
         return !!findChildOfKind(n, kind, sourceFile);
     }
 
-    export function findChildOfKind(n: Node, kind: SyntaxKind, sourceFile?: SourceFile): Node | undefined {
+    export function findChildOfKind(n: Node, kind: SyntaxKind, sourceFile?: SourceFileLike): Node | undefined {
         return forEach(n.getChildren(sourceFile), c => c.kind === kind && c);
     }
 
@@ -1003,10 +1003,6 @@ namespace ts {
         return undefined;
     }
 
-    export function isToken(n: Node): boolean {
-        return n.kind >= SyntaxKind.FirstToken && n.kind <= SyntaxKind.LastToken;
-    }
-
     export function isWord(kind: SyntaxKind): boolean {
         return kind === SyntaxKind.Identifier || isKeyword(kind);
     }
@@ -1384,9 +1380,9 @@ namespace ts {
         };
     }
 
-    export function getOpenBraceEnd(constructor: ConstructorDeclaration, sourceFile: SourceFile) {
+    export function getOpenBrace(constructor: ConstructorDeclaration, sourceFile: SourceFile) {
         // First token is the open curly, this is where we want to put the 'super' call.
-        return constructor.body.getFirstToken(sourceFile).getEnd();
+        return constructor.body.getFirstToken(sourceFile);
     }
 
     export function getFirstNonSpaceCharacterPosition(text: string, position: number) {
diff --git a/tests/baselines/reference/2dArrays.symbols b/tests/baselines/reference/2dArrays.symbols
index 8d6b6b167e6..6f02cdcf963 100644
--- a/tests/baselines/reference/2dArrays.symbols
+++ b/tests/baselines/reference/2dArrays.symbols
@@ -25,11 +25,11 @@ class Board {
 >allShipsSunk : Symbol(Board.allShipsSunk, Decl(2dArrays.ts, 9, 18))
 
         return this.ships.every(function (val) { return val.isSunk; });
->this.ships.every : Symbol(Array.every, Decl(lib.d.ts, --, --))
+>this.ships.every : Symbol(Array.every, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >this.ships : Symbol(Board.ships, Decl(2dArrays.ts, 7, 13))
 >this : Symbol(Board, Decl(2dArrays.ts, 5, 1))
 >ships : Symbol(Board.ships, Decl(2dArrays.ts, 7, 13))
->every : Symbol(Array.every, Decl(lib.d.ts, --, --))
+>every : Symbol(Array.every, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >val : Symbol(val, Decl(2dArrays.ts, 12, 42))
 >val.isSunk : Symbol(Ship.isSunk, Decl(2dArrays.ts, 3, 12))
 >val : Symbol(val, Decl(2dArrays.ts, 12, 42))
diff --git a/tests/baselines/reference/2dArrays.types b/tests/baselines/reference/2dArrays.types
index 00805899294..cd5ddc0efa5 100644
--- a/tests/baselines/reference/2dArrays.types
+++ b/tests/baselines/reference/2dArrays.types
@@ -26,12 +26,12 @@ class Board {
 
         return this.ships.every(function (val) { return val.isSunk; });
 >this.ships.every(function (val) { return val.isSunk; }) : boolean
->this.ships.every : (callbackfn: (value: Ship, index: number, array: Ship[]) => boolean, thisArg?: any) => boolean
+>this.ships.every : { (callbackfn: (this: undefined, value: Ship, index: number, array: Ship[]) => boolean): boolean; (callbackfn: (this: undefined, value: Ship, index: number, array: Ship[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Ship, index: number, array: Ship[]) => boolean, thisArg: Z): boolean; }
 >this.ships : Ship[]
 >this : this
 >ships : Ship[]
->every : (callbackfn: (value: Ship, index: number, array: Ship[]) => boolean, thisArg?: any) => boolean
->function (val) { return val.isSunk; } : (val: Ship) => boolean
+>every : { (callbackfn: (this: undefined, value: Ship, index: number, array: Ship[]) => boolean): boolean; (callbackfn: (this: undefined, value: Ship, index: number, array: Ship[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Ship, index: number, array: Ship[]) => boolean, thisArg: Z): boolean; }
+>function (val) { return val.isSunk; } : (this: undefined, val: Ship) => boolean
 >val : Ship
 >val.isSunk : boolean
 >val : Ship
diff --git a/tests/baselines/reference/anyInferenceAnonymousFunctions.symbols b/tests/baselines/reference/anyInferenceAnonymousFunctions.symbols
index ff576a36423..750c7ba85af 100644
--- a/tests/baselines/reference/anyInferenceAnonymousFunctions.symbols
+++ b/tests/baselines/reference/anyInferenceAnonymousFunctions.symbols
@@ -35,16 +35,16 @@ paired.reduce((b3, b4) => b3.concat({}), []);
 >b3 : Symbol(b3, Decl(anyInferenceAnonymousFunctions.ts, 13, 15))
 
 paired.map((c1) => c1.count);
->paired.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>paired.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >paired : Symbol(paired, Decl(anyInferenceAnonymousFunctions.ts, 0, 3))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >c1 : Symbol(c1, Decl(anyInferenceAnonymousFunctions.ts, 15, 12))
 >c1 : Symbol(c1, Decl(anyInferenceAnonymousFunctions.ts, 15, 12))
 
 paired.map(function (c2) { return c2.count; });
->paired.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>paired.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >paired : Symbol(paired, Decl(anyInferenceAnonymousFunctions.ts, 0, 3))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >c2 : Symbol(c2, Decl(anyInferenceAnonymousFunctions.ts, 16, 21))
 >c2 : Symbol(c2, Decl(anyInferenceAnonymousFunctions.ts, 16, 21))
 
diff --git a/tests/baselines/reference/anyInferenceAnonymousFunctions.types b/tests/baselines/reference/anyInferenceAnonymousFunctions.types
index 1f3bb78f958..ee176215421 100644
--- a/tests/baselines/reference/anyInferenceAnonymousFunctions.types
+++ b/tests/baselines/reference/anyInferenceAnonymousFunctions.types
@@ -57,10 +57,10 @@ paired.reduce((b3, b4) => b3.concat({}), []);
 
 paired.map((c1) => c1.count);
 >paired.map((c1) => c1.count) : any[]
->paired.map : { <U>(this: [any, any, any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U]; <U>(this: [any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): U[]; }
+>paired.map : { <U>(this: [any, any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U, U, U]; <U>(this: [any, any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [any, any, any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [any, any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U]; <U>(this: [any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U]; <U>(this: [any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U]; <U>(this: [any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): U[]; <U>(callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): U[]; }
 >paired : any[]
->map : { <U>(this: [any, any, any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U]; <U>(this: [any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): U[]; }
->(c1) => c1.count : (c1: any) => any
+>map : { <U>(this: [any, any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U, U, U]; <U>(this: [any, any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [any, any, any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [any, any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U]; <U>(this: [any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U]; <U>(this: [any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U]; <U>(this: [any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): U[]; <U>(callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): U[]; }
+>(c1) => c1.count : (this: undefined, c1: any) => any
 >c1 : any
 >c1.count : any
 >c1 : any
@@ -68,10 +68,10 @@ paired.map((c1) => c1.count);
 
 paired.map(function (c2) { return c2.count; });
 >paired.map(function (c2) { return c2.count; }) : any[]
->paired.map : { <U>(this: [any, any, any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U]; <U>(this: [any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): U[]; }
+>paired.map : { <U>(this: [any, any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U, U, U]; <U>(this: [any, any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [any, any, any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [any, any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U]; <U>(this: [any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U]; <U>(this: [any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U]; <U>(this: [any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): U[]; <U>(callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): U[]; }
 >paired : any[]
->map : { <U>(this: [any, any, any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U]; <U>(this: [any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): U[]; }
->function (c2) { return c2.count; } : (c2: any) => any
+>map : { <U>(this: [any, any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U, U, U]; <U>(this: [any, any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [any, any, any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [any, any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U]; <U>(this: [any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U]; <U>(this: [any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U]; <U>(this: [any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): U[]; <U>(callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): U[]; }
+>function (c2) { return c2.count; } : (this: undefined, c2: any) => any
 >c2 : any
 >c2.count : any
 >c2 : any
diff --git a/tests/baselines/reference/argumentsAsPropertyName.symbols b/tests/baselines/reference/argumentsAsPropertyName.symbols
index 1e3e41abb6e..a17c660374c 100644
--- a/tests/baselines/reference/argumentsAsPropertyName.symbols
+++ b/tests/baselines/reference/argumentsAsPropertyName.symbols
@@ -34,8 +34,8 @@ function myFunction(myType: MyType) {
 >x : Symbol(x, Decl(argumentsAsPropertyName.ts, 11, 13))
 
         [1, 2, 3].forEach(function(j) { use(x); })
->[1, 2, 3].forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --))
->forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --))
+>[1, 2, 3].forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >j : Symbol(j, Decl(argumentsAsPropertyName.ts, 12, 35))
 >use : Symbol(use, Decl(argumentsAsPropertyName.ts, 3, 1))
 >x : Symbol(x, Decl(argumentsAsPropertyName.ts, 11, 13))
diff --git a/tests/baselines/reference/argumentsAsPropertyName.types b/tests/baselines/reference/argumentsAsPropertyName.types
index d0aaaa1cc72..00773d2a3cf 100644
--- a/tests/baselines/reference/argumentsAsPropertyName.types
+++ b/tests/baselines/reference/argumentsAsPropertyName.types
@@ -42,13 +42,13 @@ function myFunction(myType: MyType) {
 
         [1, 2, 3].forEach(function(j) { use(x); })
 >[1, 2, 3].forEach(function(j) { use(x); }) : void
->[1, 2, 3].forEach : (callbackfn: (value: number, index: number, array: number[]) => void, thisArg?: any) => void
+>[1, 2, 3].forEach : { (callbackfn: (this: undefined, value: number, index: number, array: number[]) => void): void; (callbackfn: (this: undefined, value: number, index: number, array: number[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: number, index: number, array: number[]) => void, thisArg: Z): void; }
 >[1, 2, 3] : number[]
 >1 : 1
 >2 : 2
 >3 : 3
->forEach : (callbackfn: (value: number, index: number, array: number[]) => void, thisArg?: any) => void
->function(j) { use(x); } : (j: number) => void
+>forEach : { (callbackfn: (this: undefined, value: number, index: number, array: number[]) => void): void; (callbackfn: (this: undefined, value: number, index: number, array: number[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: number, index: number, array: number[]) => void, thisArg: Z): void; }
+>function(j) { use(x); } : (this: undefined, j: number) => void
 >j : number
 >use(x) : any
 >use : (s: any) => any
diff --git a/tests/baselines/reference/arrayConcatMap.symbols b/tests/baselines/reference/arrayConcatMap.symbols
index c3df6bed533..1b26708ae94 100644
--- a/tests/baselines/reference/arrayConcatMap.symbols
+++ b/tests/baselines/reference/arrayConcatMap.symbols
@@ -1,14 +1,14 @@
 === tests/cases/compiler/arrayConcatMap.ts ===
 var x = [].concat([{ a: 1 }], [{ a: 2 }])
 >x : Symbol(x, Decl(arrayConcatMap.ts, 0, 3))
->[].concat([{ a: 1 }], [{ a: 2 }])          .map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>[].concat([{ a: 1 }], [{ a: 2 }])          .map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >[].concat : Symbol(Array.concat, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >concat : Symbol(Array.concat, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >a : Symbol(a, Decl(arrayConcatMap.ts, 0, 20))
 >a : Symbol(a, Decl(arrayConcatMap.ts, 0, 32))
 
           .map(b => b.a);
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >b : Symbol(b, Decl(arrayConcatMap.ts, 1, 15))
 >b : Symbol(b, Decl(arrayConcatMap.ts, 1, 15))
 
diff --git a/tests/baselines/reference/arrayConcatMap.types b/tests/baselines/reference/arrayConcatMap.types
index 10e0a74c16d..da4e998f92c 100644
--- a/tests/baselines/reference/arrayConcatMap.types
+++ b/tests/baselines/reference/arrayConcatMap.types
@@ -2,7 +2,7 @@
 var x = [].concat([{ a: 1 }], [{ a: 2 }])
 >x : any[]
 >[].concat([{ a: 1 }], [{ a: 2 }])          .map(b => b.a) : any[]
->[].concat([{ a: 1 }], [{ a: 2 }])          .map : { <U>(this: [any, any, any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U]; <U>(this: [any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): U[]; }
+>[].concat([{ a: 1 }], [{ a: 2 }])          .map : { <U>(this: [any, any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U, U, U]; <U>(this: [any, any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [any, any, any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [any, any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U]; <U>(this: [any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U]; <U>(this: [any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U]; <U>(this: [any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): U[]; <U>(callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): U[]; }
 >[].concat([{ a: 1 }], [{ a: 2 }]) : any[]
 >[].concat : { (...items: any[][]): any[]; (...items: any[]): any[]; }
 >[] : undefined[]
@@ -17,8 +17,8 @@ var x = [].concat([{ a: 1 }], [{ a: 2 }])
 >2 : 2
 
           .map(b => b.a);
->map : { <U>(this: [any, any, any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U]; <U>(this: [any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): U[]; }
->b => b.a : (b: any) => any
+>map : { <U>(this: [any, any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U, U, U]; <U>(this: [any, any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [any, any, any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [any, any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U]; <U>(this: [any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U]; <U>(this: [any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U]; <U>(this: [any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): U[]; <U>(callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): U[]; }
+>b => b.a : (this: undefined, b: any) => any
 >b : any
 >b.a : any
 >b : any
diff --git a/tests/baselines/reference/arrayFilter.symbols b/tests/baselines/reference/arrayFilter.symbols
index fcdd39117a7..81d92ba04b6 100644
--- a/tests/baselines/reference/arrayFilter.symbols
+++ b/tests/baselines/reference/arrayFilter.symbols
@@ -14,9 +14,9 @@ var foo = [
 ]
 
 foo.filter(x => x.name); //should accepted all possible types not only boolean! 
->foo.filter : Symbol(Array.filter, Decl(lib.d.ts, --, --))
+>foo.filter : Symbol(Array.filter, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >foo : Symbol(foo, Decl(arrayFilter.ts, 0, 3))
->filter : Symbol(Array.filter, Decl(lib.d.ts, --, --))
+>filter : Symbol(Array.filter, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >x : Symbol(x, Decl(arrayFilter.ts, 6, 11))
 >x.name : Symbol(name, Decl(arrayFilter.ts, 1, 5))
 >x : Symbol(x, Decl(arrayFilter.ts, 6, 11))
diff --git a/tests/baselines/reference/arrayFilter.types b/tests/baselines/reference/arrayFilter.types
index 43ef4161a06..de11296f832 100644
--- a/tests/baselines/reference/arrayFilter.types
+++ b/tests/baselines/reference/arrayFilter.types
@@ -22,10 +22,10 @@ var foo = [
 
 foo.filter(x => x.name); //should accepted all possible types not only boolean! 
 >foo.filter(x => x.name) : { name: string; }[]
->foo.filter : (callbackfn: (value: { name: string; }, index: number, array: { name: string; }[]) => any, thisArg?: any) => { name: string; }[]
+>foo.filter : { (callbackfn: (this: undefined, value: { name: string; }, index: number, array: { name: string; }[]) => any): { name: string; }[]; (callbackfn: (this: undefined, value: { name: string; }, index: number, array: { name: string; }[]) => any, thisArg: undefined): { name: string; }[]; <Z>(callbackfn: (this: Z, value: { name: string; }, index: number, array: { name: string; }[]) => any, thisArg: Z): { name: string; }[]; }
 >foo : { name: string; }[]
->filter : (callbackfn: (value: { name: string; }, index: number, array: { name: string; }[]) => any, thisArg?: any) => { name: string; }[]
->x => x.name : (x: { name: string; }) => string
+>filter : { (callbackfn: (this: undefined, value: { name: string; }, index: number, array: { name: string; }[]) => any): { name: string; }[]; (callbackfn: (this: undefined, value: { name: string; }, index: number, array: { name: string; }[]) => any, thisArg: undefined): { name: string; }[]; <Z>(callbackfn: (this: Z, value: { name: string; }, index: number, array: { name: string; }[]) => any, thisArg: Z): { name: string; }[]; }
+>x => x.name : (this: undefined, x: { name: string; }) => string
 >x : { name: string; }
 >x.name : string
 >x : { name: string; }
diff --git a/tests/baselines/reference/bestChoiceType.symbols b/tests/baselines/reference/bestChoiceType.symbols
index 737ba35b520..d6197ad9a6b 100644
--- a/tests/baselines/reference/bestChoiceType.symbols
+++ b/tests/baselines/reference/bestChoiceType.symbols
@@ -3,10 +3,10 @@
 // Repro from #10041
 
 (''.match(/ /) || []).map(s => s.toLowerCase());
->(''.match(/ /) || []).map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
->''.match : Symbol(String.match, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
->match : Symbol(String.match, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>(''.match(/ /) || []).map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>''.match : Symbol(String.match, Decl(lib.d.ts, --, --))
+>match : Symbol(String.match, Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >s : Symbol(s, Decl(bestChoiceType.ts, 3, 26))
 >s.toLowerCase : Symbol(String.toLowerCase, Decl(lib.d.ts, --, --))
 >s : Symbol(s, Decl(bestChoiceType.ts, 3, 26))
@@ -19,8 +19,8 @@ function f1() {
 
     let x = ''.match(/ /);
 >x : Symbol(x, Decl(bestChoiceType.ts, 8, 7))
->''.match : Symbol(String.match, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
->match : Symbol(String.match, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>''.match : Symbol(String.match, Decl(lib.d.ts, --, --))
+>match : Symbol(String.match, Decl(lib.d.ts, --, --))
 
     let y = x || [];
 >y : Symbol(y, Decl(bestChoiceType.ts, 9, 7))
@@ -28,9 +28,9 @@ function f1() {
 
     let z = y.map(s => s.toLowerCase());
 >z : Symbol(z, Decl(bestChoiceType.ts, 10, 7))
->y.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>y.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >y : Symbol(y, Decl(bestChoiceType.ts, 9, 7))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >s : Symbol(s, Decl(bestChoiceType.ts, 10, 18))
 >s.toLowerCase : Symbol(String.toLowerCase, Decl(lib.d.ts, --, --))
 >s : Symbol(s, Decl(bestChoiceType.ts, 10, 18))
@@ -42,8 +42,8 @@ function f2() {
 
     let x = ''.match(/ /);
 >x : Symbol(x, Decl(bestChoiceType.ts, 14, 7))
->''.match : Symbol(String.match, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
->match : Symbol(String.match, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>''.match : Symbol(String.match, Decl(lib.d.ts, --, --))
+>match : Symbol(String.match, Decl(lib.d.ts, --, --))
 
     let y = x ? x : [];
 >y : Symbol(y, Decl(bestChoiceType.ts, 15, 7))
@@ -52,9 +52,9 @@ function f2() {
 
     let z = y.map(s => s.toLowerCase());
 >z : Symbol(z, Decl(bestChoiceType.ts, 16, 7))
->y.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>y.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >y : Symbol(y, Decl(bestChoiceType.ts, 15, 7))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >s : Symbol(s, Decl(bestChoiceType.ts, 16, 18))
 >s.toLowerCase : Symbol(String.toLowerCase, Decl(lib.d.ts, --, --))
 >s : Symbol(s, Decl(bestChoiceType.ts, 16, 18))
diff --git a/tests/baselines/reference/bestChoiceType.types b/tests/baselines/reference/bestChoiceType.types
index 07b61fc9f84..1aa35c8da9e 100644
--- a/tests/baselines/reference/bestChoiceType.types
+++ b/tests/baselines/reference/bestChoiceType.types
@@ -4,17 +4,17 @@
 
 (''.match(/ /) || []).map(s => s.toLowerCase());
 >(''.match(/ /) || []).map(s => s.toLowerCase()) : string[]
->(''.match(/ /) || []).map : { <U>(this: [string, string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U]; <U>(this: [string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): U[]; }
+>(''.match(/ /) || []).map : { <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U, U]; <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [string, string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): U[]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): U[]; }
 >(''.match(/ /) || []) : RegExpMatchArray
 >''.match(/ /) || [] : RegExpMatchArray
 >''.match(/ /) : RegExpMatchArray | null
->''.match : { (regexp: string): RegExpMatchArray | null; (regexp: RegExp): RegExpMatchArray | null; }
+>''.match : (regexp: string | RegExp) => RegExpMatchArray | null
 >'' : ""
->match : { (regexp: string): RegExpMatchArray | null; (regexp: RegExp): RegExpMatchArray | null; }
+>match : (regexp: string | RegExp) => RegExpMatchArray | null
 >/ / : RegExp
 >[] : never[]
->map : { <U>(this: [string, string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U]; <U>(this: [string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): U[]; }
->s => s.toLowerCase() : (s: string) => string
+>map : { <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U, U]; <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [string, string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): U[]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): U[]; }
+>s => s.toLowerCase() : (this: undefined, s: string) => string
 >s : string
 >s.toLowerCase() : string
 >s.toLowerCase : () => string
@@ -29,9 +29,9 @@ function f1() {
     let x = ''.match(/ /);
 >x : RegExpMatchArray | null
 >''.match(/ /) : RegExpMatchArray | null
->''.match : { (regexp: string): RegExpMatchArray | null; (regexp: RegExp): RegExpMatchArray | null; }
+>''.match : (regexp: string | RegExp) => RegExpMatchArray | null
 >'' : ""
->match : { (regexp: string): RegExpMatchArray | null; (regexp: RegExp): RegExpMatchArray | null; }
+>match : (regexp: string | RegExp) => RegExpMatchArray | null
 >/ / : RegExp
 
     let y = x || [];
@@ -43,10 +43,10 @@ function f1() {
     let z = y.map(s => s.toLowerCase());
 >z : string[]
 >y.map(s => s.toLowerCase()) : string[]
->y.map : { <U>(this: [string, string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U]; <U>(this: [string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): U[]; }
+>y.map : { <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U, U]; <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [string, string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): U[]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): U[]; }
 >y : RegExpMatchArray
->map : { <U>(this: [string, string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U]; <U>(this: [string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): U[]; }
->s => s.toLowerCase() : (s: string) => string
+>map : { <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U, U]; <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [string, string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): U[]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): U[]; }
+>s => s.toLowerCase() : (this: undefined, s: string) => string
 >s : string
 >s.toLowerCase() : string
 >s.toLowerCase : () => string
@@ -60,9 +60,9 @@ function f2() {
     let x = ''.match(/ /);
 >x : RegExpMatchArray | null
 >''.match(/ /) : RegExpMatchArray | null
->''.match : { (regexp: string): RegExpMatchArray | null; (regexp: RegExp): RegExpMatchArray | null; }
+>''.match : (regexp: string | RegExp) => RegExpMatchArray | null
 >'' : ""
->match : { (regexp: string): RegExpMatchArray | null; (regexp: RegExp): RegExpMatchArray | null; }
+>match : (regexp: string | RegExp) => RegExpMatchArray | null
 >/ / : RegExp
 
     let y = x ? x : [];
@@ -75,10 +75,10 @@ function f2() {
     let z = y.map(s => s.toLowerCase());
 >z : string[]
 >y.map(s => s.toLowerCase()) : string[]
->y.map : { <U>(this: [string, string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U]; <U>(this: [string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): U[]; }
+>y.map : { <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U, U]; <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [string, string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): U[]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): U[]; }
 >y : RegExpMatchArray
->map : { <U>(this: [string, string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U]; <U>(this: [string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): U[]; }
->s => s.toLowerCase() : (s: string) => string
+>map : { <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U, U]; <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [string, string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): U[]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): U[]; }
+>s => s.toLowerCase() : (this: undefined, s: string) => string
 >s : string
 >s.toLowerCase() : string
 >s.toLowerCase : () => string
diff --git a/tests/baselines/reference/checkSwitchStatementIfCaseTypeIsString.symbols b/tests/baselines/reference/checkSwitchStatementIfCaseTypeIsString.symbols
index 2a6ba238b4b..33f8f88f9e0 100644
--- a/tests/baselines/reference/checkSwitchStatementIfCaseTypeIsString.symbols
+++ b/tests/baselines/reference/checkSwitchStatementIfCaseTypeIsString.symbols
@@ -12,9 +12,9 @@ class A {
 >Array : Symbol(Array, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 
         x.forEach((v) => {
->x.forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --))
+>x.forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >x : Symbol(x, Decl(checkSwitchStatementIfCaseTypeIsString.ts, 3, 9))
->forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --))
+>forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >v : Symbol(v, Decl(checkSwitchStatementIfCaseTypeIsString.ts, 4, 19))
 
             switch(v) {
diff --git a/tests/baselines/reference/checkSwitchStatementIfCaseTypeIsString.types b/tests/baselines/reference/checkSwitchStatementIfCaseTypeIsString.types
index 30f584894fc..7bae17fb922 100644
--- a/tests/baselines/reference/checkSwitchStatementIfCaseTypeIsString.types
+++ b/tests/baselines/reference/checkSwitchStatementIfCaseTypeIsString.types
@@ -13,10 +13,10 @@ class A {
 
         x.forEach((v) => {
 >x.forEach((v) => {            switch(v) {                case "test": use(this);            }        }) : void
->x.forEach : (callbackfn: (value: string, index: number, array: string[]) => void, thisArg?: any) => void
+>x.forEach : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void): void; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => void, thisArg: Z): void; }
 >x : string[]
->forEach : (callbackfn: (value: string, index: number, array: string[]) => void, thisArg?: any) => void
->(v) => {            switch(v) {                case "test": use(this);            }        } : (v: string) => void
+>forEach : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void): void; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => void, thisArg: Z): void; }
+>(v) => {            switch(v) {                case "test": use(this);            }        } : (this: undefined, v: string) => void
 >v : string
 
             switch(v) {
diff --git a/tests/baselines/reference/classExpressionWithStaticProperties3.symbols b/tests/baselines/reference/classExpressionWithStaticProperties3.symbols
index ff9b7b0d311..4c7750c12a7 100644
--- a/tests/baselines/reference/classExpressionWithStaticProperties3.symbols
+++ b/tests/baselines/reference/classExpressionWithStaticProperties3.symbols
@@ -31,9 +31,9 @@ for (let i = 0; i < 3; i++) {
     });
 }
 arr.forEach(C => console.log(C.y()));
->arr.forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --))
+>arr.forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >arr : Symbol(arr, Decl(classExpressionWithStaticProperties3.ts, 2, 5))
->forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --))
+>forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >C : Symbol(C, Decl(classExpressionWithStaticProperties3.ts, 9, 12))
 >console : Symbol(console, Decl(classExpressionWithStaticProperties3.ts, 1, 11))
 >C.y : Symbol(y, Decl(classExpressionWithStaticProperties3.ts, 2, 12))
diff --git a/tests/baselines/reference/classExpressionWithStaticProperties3.types b/tests/baselines/reference/classExpressionWithStaticProperties3.types
index b7f6102c8b7..dbbb1f378a8 100644
--- a/tests/baselines/reference/classExpressionWithStaticProperties3.types
+++ b/tests/baselines/reference/classExpressionWithStaticProperties3.types
@@ -42,10 +42,10 @@ for (let i = 0; i < 3; i++) {
 }
 arr.forEach(C => console.log(C.y()));
 >arr.forEach(C => console.log(C.y())) : void
->arr.forEach : (callbackfn: (value: { y(): number; }, index: number, array: { y(): number; }[]) => void, thisArg?: any) => void
+>arr.forEach : { (callbackfn: (this: undefined, value: { y(): number; }, index: number, array: { y(): number; }[]) => void): void; (callbackfn: (this: undefined, value: { y(): number; }, index: number, array: { y(): number; }[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: { y(): number; }, index: number, array: { y(): number; }[]) => void, thisArg: Z): void; }
 >arr : { y(): number; }[]
->forEach : (callbackfn: (value: { y(): number; }, index: number, array: { y(): number; }[]) => void, thisArg?: any) => void
->C => console.log(C.y()) : (C: { y(): number; }) => any
+>forEach : { (callbackfn: (this: undefined, value: { y(): number; }, index: number, array: { y(): number; }[]) => void): void; (callbackfn: (this: undefined, value: { y(): number; }, index: number, array: { y(): number; }[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: { y(): number; }, index: number, array: { y(): number; }[]) => void, thisArg: Z): void; }
+>C => console.log(C.y()) : (this: undefined, C: { y(): number; }) => any
 >C : { y(): number; }
 >console.log(C.y()) : any
 >console.log : any
diff --git a/tests/baselines/reference/classExpressionWithStaticPropertiesES63.symbols b/tests/baselines/reference/classExpressionWithStaticPropertiesES63.symbols
index f1a7fa807f5..94ea5cfaa8c 100644
--- a/tests/baselines/reference/classExpressionWithStaticPropertiesES63.symbols
+++ b/tests/baselines/reference/classExpressionWithStaticPropertiesES63.symbols
@@ -31,9 +31,9 @@ for (let i = 0; i < 3; i++) {
     });
 }
 arr.forEach(C => console.log(C.y()));
->arr.forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --))
+>arr.forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
 >arr : Symbol(arr, Decl(classExpressionWithStaticPropertiesES63.ts, 2, 5))
->forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --))
+>forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
 >C : Symbol(C, Decl(classExpressionWithStaticPropertiesES63.ts, 9, 12))
 >console : Symbol(console, Decl(classExpressionWithStaticPropertiesES63.ts, 1, 11))
 >C.y : Symbol(y, Decl(classExpressionWithStaticPropertiesES63.ts, 2, 12))
diff --git a/tests/baselines/reference/classExpressionWithStaticPropertiesES63.types b/tests/baselines/reference/classExpressionWithStaticPropertiesES63.types
index 3bc780785aa..b725df6fd74 100644
--- a/tests/baselines/reference/classExpressionWithStaticPropertiesES63.types
+++ b/tests/baselines/reference/classExpressionWithStaticPropertiesES63.types
@@ -42,10 +42,10 @@ for (let i = 0; i < 3; i++) {
 }
 arr.forEach(C => console.log(C.y()));
 >arr.forEach(C => console.log(C.y())) : void
->arr.forEach : (callbackfn: (value: { y(): number; }, index: number, array: { y(): number; }[]) => void, thisArg?: any) => void
+>arr.forEach : { (callbackfn: (this: undefined, value: { y(): number; }, index: number, array: { y(): number; }[]) => void): void; (callbackfn: (this: undefined, value: { y(): number; }, index: number, array: { y(): number; }[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: { y(): number; }, index: number, array: { y(): number; }[]) => void, thisArg: Z): void; }
 >arr : { y(): number; }[]
->forEach : (callbackfn: (value: { y(): number; }, index: number, array: { y(): number; }[]) => void, thisArg?: any) => void
->C => console.log(C.y()) : (C: { y(): number; }) => any
+>forEach : { (callbackfn: (this: undefined, value: { y(): number; }, index: number, array: { y(): number; }[]) => void): void; (callbackfn: (this: undefined, value: { y(): number; }, index: number, array: { y(): number; }[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: { y(): number; }, index: number, array: { y(): number; }[]) => void, thisArg: Z): void; }
+>C => console.log(C.y()) : (this: undefined, C: { y(): number; }) => any
 >C : { y(): number; }
 >console.log(C.y()) : any
 >console.log : any
diff --git a/tests/baselines/reference/commaOperatorInConditionalExpression.symbols b/tests/baselines/reference/commaOperatorInConditionalExpression.symbols
index 18f749c5c5c..cb124f21f15 100644
--- a/tests/baselines/reference/commaOperatorInConditionalExpression.symbols
+++ b/tests/baselines/reference/commaOperatorInConditionalExpression.symbols
@@ -4,8 +4,8 @@ function f (m: string) {
 >m : Symbol(m, Decl(commaOperatorInConditionalExpression.ts, 0, 12))
 
     [1, 2, 3].map(i => {
->[1, 2, 3].map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>[1, 2, 3].map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >i : Symbol(i, Decl(commaOperatorInConditionalExpression.ts, 1, 18))
 
         return true? { [m]: i } : { [m]: i + 1 }
diff --git a/tests/baselines/reference/commaOperatorInConditionalExpression.types b/tests/baselines/reference/commaOperatorInConditionalExpression.types
index f46282f9b6b..de8a95cd6c3 100644
--- a/tests/baselines/reference/commaOperatorInConditionalExpression.types
+++ b/tests/baselines/reference/commaOperatorInConditionalExpression.types
@@ -5,13 +5,13 @@ function f (m: string) {
 
     [1, 2, 3].map(i => {
 >[1, 2, 3].map(i => {        return true? { [m]: i } : { [m]: i + 1 }    }) : { [x: string]: number; }[]
->[1, 2, 3].map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
+>[1, 2, 3].map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
 >[1, 2, 3] : number[]
 >1 : 1
 >2 : 2
 >3 : 3
->map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
->i => {        return true? { [m]: i } : { [m]: i + 1 }    } : (i: number) => { [x: string]: number; }
+>map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
+>i => {        return true? { [m]: i } : { [m]: i + 1 }    } : (this: undefined, i: number) => { [x: string]: number; }
 >i : number
 
         return true? { [m]: i } : { [m]: i + 1 }
diff --git a/tests/baselines/reference/commentInMethodCall.symbols b/tests/baselines/reference/commentInMethodCall.symbols
index 1ef762da871..e082d24daf3 100644
--- a/tests/baselines/reference/commentInMethodCall.symbols
+++ b/tests/baselines/reference/commentInMethodCall.symbols
@@ -4,9 +4,9 @@ var s: string[];
 >s : Symbol(s, Decl(commentInMethodCall.ts, 1, 3))
 
 s.map(// do something
->s.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>s.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >s : Symbol(s, Decl(commentInMethodCall.ts, 1, 3))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 
     function () { });
 
diff --git a/tests/baselines/reference/commentInMethodCall.types b/tests/baselines/reference/commentInMethodCall.types
index a97b0319777..eebbc15823e 100644
--- a/tests/baselines/reference/commentInMethodCall.types
+++ b/tests/baselines/reference/commentInMethodCall.types
@@ -5,10 +5,10 @@ var s: string[];
 
 s.map(// do something
 >s.map(// do something    function () { }) : void[]
->s.map : { <U>(this: [string, string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U]; <U>(this: [string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): U[]; }
+>s.map : { <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U, U]; <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [string, string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): U[]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): U[]; }
 >s : string[]
->map : { <U>(this: [string, string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U]; <U>(this: [string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): U[]; }
+>map : { <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U, U]; <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [string, string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): U[]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): U[]; }
 
     function () { });
->function () { } : () => void
+>function () { } : (this: undefined) => void
 
diff --git a/tests/baselines/reference/contextualSignatureInstantiation3.symbols b/tests/baselines/reference/contextualSignatureInstantiation3.symbols
index 50dac0b5d67..a9653673ff2 100644
--- a/tests/baselines/reference/contextualSignatureInstantiation3.symbols
+++ b/tests/baselines/reference/contextualSignatureInstantiation3.symbols
@@ -12,9 +12,9 @@ function map<T, U>(items: T[], f: (x: T) => U): U[]{
 >U : Symbol(U, Decl(contextualSignatureInstantiation3.ts, 0, 15))
 
     return items.map(f);
->items.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>items.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >items : Symbol(items, Decl(contextualSignatureInstantiation3.ts, 0, 19))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >f : Symbol(f, Decl(contextualSignatureInstantiation3.ts, 0, 30))
 }
 
@@ -47,9 +47,9 @@ var v1: number[];
 
 var v1 = xs.map(identity);      // Error if not number[]
 >v1 : Symbol(v1, Decl(contextualSignatureInstantiation3.ts, 15, 3), Decl(contextualSignatureInstantiation3.ts, 16, 3), Decl(contextualSignatureInstantiation3.ts, 17, 3))
->xs.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>xs.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >xs : Symbol(xs, Decl(contextualSignatureInstantiation3.ts, 12, 3))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >identity : Symbol(identity, Decl(contextualSignatureInstantiation3.ts, 2, 1))
 
 var v1 = map(xs, identity);     // Error if not number[]
@@ -63,9 +63,9 @@ var v2: number[][];
 
 var v2 = xs.map(singleton);     // Error if not number[][]
 >v2 : Symbol(v2, Decl(contextualSignatureInstantiation3.ts, 19, 3), Decl(contextualSignatureInstantiation3.ts, 20, 3), Decl(contextualSignatureInstantiation3.ts, 21, 3))
->xs.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>xs.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >xs : Symbol(xs, Decl(contextualSignatureInstantiation3.ts, 12, 3))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >singleton : Symbol(singleton, Decl(contextualSignatureInstantiation3.ts, 6, 1))
 
 var v2 = map(xs, singleton);    // Error if not number[][]
diff --git a/tests/baselines/reference/contextualSignatureInstantiation3.types b/tests/baselines/reference/contextualSignatureInstantiation3.types
index 409c685215d..dcb7284ceaa 100644
--- a/tests/baselines/reference/contextualSignatureInstantiation3.types
+++ b/tests/baselines/reference/contextualSignatureInstantiation3.types
@@ -13,9 +13,9 @@ function map<T, U>(items: T[], f: (x: T) => U): U[]{
 
     return items.map(f);
 >items.map(f) : U[]
->items.map : { <U>(this: [T, T, T, T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [T, T, T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [T, T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U, U]; <U>(this: [T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): U[]; }
+>items.map : { <U>(this: [T, T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U, U, U, U]; <U>(this: [T, T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [T, T, T, T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U, U, U]; <U>(this: [T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [T, T, T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U, U]; <U>(this: [T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [T, T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U, U]; <U>(this: [T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U]; <U>(this: [T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): U[]; <U>(callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): U[]; }
 >items : T[]
->map : { <U>(this: [T, T, T, T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [T, T, T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [T, T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U, U]; <U>(this: [T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): U[]; }
+>map : { <U>(this: [T, T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U, U, U, U]; <U>(this: [T, T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [T, T, T, T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U, U, U]; <U>(this: [T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [T, T, T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U, U]; <U>(this: [T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [T, T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U, U]; <U>(this: [T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U]; <U>(this: [T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): U[]; <U>(callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): U[]; }
 >f : (x: T) => U
 }
 
@@ -54,9 +54,9 @@ var v1: number[];
 var v1 = xs.map(identity);      // Error if not number[]
 >v1 : number[]
 >xs.map(identity) : number[]
->xs.map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
+>xs.map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
 >xs : number[]
->map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
+>map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
 >identity : <T>(x: T) => T
 
 var v1 = map(xs, identity);     // Error if not number[]
@@ -72,9 +72,9 @@ var v2: number[][];
 var v2 = xs.map(singleton);     // Error if not number[][]
 >v2 : number[][]
 >xs.map(singleton) : number[][]
->xs.map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
+>xs.map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
 >xs : number[]
->map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
+>map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
 >singleton : <T>(x: T) => T[]
 
 var v2 = map(xs, singleton);    // Error if not number[][]
diff --git a/tests/baselines/reference/contextuallyTypedIife.symbols b/tests/baselines/reference/contextuallyTypedIife.symbols
index 7a73beaad16..96e57c1f62f 100644
--- a/tests/baselines/reference/contextuallyTypedIife.symbols
+++ b/tests/baselines/reference/contextuallyTypedIife.symbols
@@ -47,25 +47,25 @@
 // rest parameters
 ((...numbers) => numbers.every(n => n > 0))(5,6,7);
 >numbers : Symbol(numbers, Decl(contextuallyTypedIife.ts, 17, 2))
->numbers.every : Symbol(Array.every, Decl(lib.d.ts, --, --))
+>numbers.every : Symbol(Array.every, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >numbers : Symbol(numbers, Decl(contextuallyTypedIife.ts, 17, 2))
->every : Symbol(Array.every, Decl(lib.d.ts, --, --))
+>every : Symbol(Array.every, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >n : Symbol(n, Decl(contextuallyTypedIife.ts, 17, 31))
 >n : Symbol(n, Decl(contextuallyTypedIife.ts, 17, 31))
 
 ((...mixed) => mixed.every(n => !!n))(5,'oops','oh no');
 >mixed : Symbol(mixed, Decl(contextuallyTypedIife.ts, 18, 2))
->mixed.every : Symbol(Array.every, Decl(lib.d.ts, --, --))
+>mixed.every : Symbol(Array.every, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >mixed : Symbol(mixed, Decl(contextuallyTypedIife.ts, 18, 2))
->every : Symbol(Array.every, Decl(lib.d.ts, --, --))
+>every : Symbol(Array.every, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >n : Symbol(n, Decl(contextuallyTypedIife.ts, 18, 27))
 >n : Symbol(n, Decl(contextuallyTypedIife.ts, 18, 27))
 
 ((...noNumbers) => noNumbers.some(n => n > 0))();
 >noNumbers : Symbol(noNumbers, Decl(contextuallyTypedIife.ts, 19, 2))
->noNumbers.some : Symbol(Array.some, Decl(lib.d.ts, --, --))
+>noNumbers.some : Symbol(Array.some, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >noNumbers : Symbol(noNumbers, Decl(contextuallyTypedIife.ts, 19, 2))
->some : Symbol(Array.some, Decl(lib.d.ts, --, --))
+>some : Symbol(Array.some, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >n : Symbol(n, Decl(contextuallyTypedIife.ts, 19, 34))
 >n : Symbol(n, Decl(contextuallyTypedIife.ts, 19, 34))
 
@@ -73,9 +73,9 @@
 >first : Symbol(first, Decl(contextuallyTypedIife.ts, 20, 2))
 >rest : Symbol(rest, Decl(contextuallyTypedIife.ts, 20, 8))
 >first : Symbol(first, Decl(contextuallyTypedIife.ts, 20, 2))
->rest.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>rest.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >rest : Symbol(rest, Decl(contextuallyTypedIife.ts, 20, 8))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >n : Symbol(n, Decl(contextuallyTypedIife.ts, 20, 43))
 >n : Symbol(n, Decl(contextuallyTypedIife.ts, 20, 43))
 
diff --git a/tests/baselines/reference/contextuallyTypedIife.types b/tests/baselines/reference/contextuallyTypedIife.types
index 676755fb341..b8c59a618b8 100644
--- a/tests/baselines/reference/contextuallyTypedIife.types
+++ b/tests/baselines/reference/contextuallyTypedIife.types
@@ -105,10 +105,10 @@
 >(...numbers) => numbers.every(n => n > 0) : (...numbers: number[]) => boolean
 >numbers : number[]
 >numbers.every(n => n > 0) : boolean
->numbers.every : (callbackfn: (value: number, index: number, array: number[]) => boolean, thisArg?: any) => boolean
+>numbers.every : { (callbackfn: (this: undefined, value: number, index: number, array: number[]) => boolean): boolean; (callbackfn: (this: undefined, value: number, index: number, array: number[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: number, index: number, array: number[]) => boolean, thisArg: Z): boolean; }
 >numbers : number[]
->every : (callbackfn: (value: number, index: number, array: number[]) => boolean, thisArg?: any) => boolean
->n => n > 0 : (n: number) => boolean
+>every : { (callbackfn: (this: undefined, value: number, index: number, array: number[]) => boolean): boolean; (callbackfn: (this: undefined, value: number, index: number, array: number[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: number, index: number, array: number[]) => boolean, thisArg: Z): boolean; }
+>n => n > 0 : (this: undefined, n: number) => boolean
 >n : number
 >n > 0 : boolean
 >n : number
@@ -123,10 +123,10 @@
 >(...mixed) => mixed.every(n => !!n) : (...mixed: (string | number)[]) => boolean
 >mixed : (string | number)[]
 >mixed.every(n => !!n) : boolean
->mixed.every : (callbackfn: (value: string | number, index: number, array: (string | number)[]) => boolean, thisArg?: any) => boolean
+>mixed.every : { (callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => boolean): boolean; (callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: string | number, index: number, array: (string | number)[]) => boolean, thisArg: Z): boolean; }
 >mixed : (string | number)[]
->every : (callbackfn: (value: string | number, index: number, array: (string | number)[]) => boolean, thisArg?: any) => boolean
->n => !!n : (n: string | number) => boolean
+>every : { (callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => boolean): boolean; (callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: string | number, index: number, array: (string | number)[]) => boolean, thisArg: Z): boolean; }
+>n => !!n : (this: undefined, n: string | number) => boolean
 >n : string | number
 >!!n : boolean
 >!n : boolean
@@ -141,10 +141,10 @@
 >(...noNumbers) => noNumbers.some(n => n > 0) : (...noNumbers: any[]) => boolean
 >noNumbers : any[]
 >noNumbers.some(n => n > 0) : boolean
->noNumbers.some : (callbackfn: (value: any, index: number, array: any[]) => boolean, thisArg?: any) => boolean
+>noNumbers.some : { (callbackfn: (this: undefined, value: any, index: number, array: any[]) => boolean): boolean; (callbackfn: (this: undefined, value: any, index: number, array: any[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: any, index: number, array: any[]) => boolean, thisArg: Z): boolean; }
 >noNumbers : any[]
->some : (callbackfn: (value: any, index: number, array: any[]) => boolean, thisArg?: any) => boolean
->n => n > 0 : (n: any) => boolean
+>some : { (callbackfn: (this: undefined, value: any, index: number, array: any[]) => boolean): boolean; (callbackfn: (this: undefined, value: any, index: number, array: any[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: any, index: number, array: any[]) => boolean, thisArg: Z): boolean; }
+>n => n > 0 : (this: undefined, n: any) => boolean
 >n : any
 >n > 0 : boolean
 >n : any
@@ -160,10 +160,10 @@
 >first : number
 >[] : undefined[]
 >rest.map(n => n > 0) : boolean[]
->rest.map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
+>rest.map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
 >rest : number[]
->map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
->n => n > 0 : (n: number) => boolean
+>map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
+>n => n > 0 : (this: undefined, n: number) => boolean
 >n : number
 >n > 0 : boolean
 >n : number
diff --git a/tests/baselines/reference/contextuallyTypedIifeStrict.symbols b/tests/baselines/reference/contextuallyTypedIifeStrict.symbols
index f76c9caa104..62b585122dd 100644
--- a/tests/baselines/reference/contextuallyTypedIifeStrict.symbols
+++ b/tests/baselines/reference/contextuallyTypedIifeStrict.symbols
@@ -47,25 +47,25 @@
 // rest parameters
 ((...numbers) => numbers.every(n => n > 0))(5,6,7);
 >numbers : Symbol(numbers, Decl(contextuallyTypedIifeStrict.ts, 17, 2))
->numbers.every : Symbol(Array.every, Decl(lib.d.ts, --, --))
+>numbers.every : Symbol(Array.every, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >numbers : Symbol(numbers, Decl(contextuallyTypedIifeStrict.ts, 17, 2))
->every : Symbol(Array.every, Decl(lib.d.ts, --, --))
+>every : Symbol(Array.every, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >n : Symbol(n, Decl(contextuallyTypedIifeStrict.ts, 17, 31))
 >n : Symbol(n, Decl(contextuallyTypedIifeStrict.ts, 17, 31))
 
 ((...mixed) => mixed.every(n => !!n))(5,'oops','oh no');
 >mixed : Symbol(mixed, Decl(contextuallyTypedIifeStrict.ts, 18, 2))
->mixed.every : Symbol(Array.every, Decl(lib.d.ts, --, --))
+>mixed.every : Symbol(Array.every, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >mixed : Symbol(mixed, Decl(contextuallyTypedIifeStrict.ts, 18, 2))
->every : Symbol(Array.every, Decl(lib.d.ts, --, --))
+>every : Symbol(Array.every, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >n : Symbol(n, Decl(contextuallyTypedIifeStrict.ts, 18, 27))
 >n : Symbol(n, Decl(contextuallyTypedIifeStrict.ts, 18, 27))
 
 ((...noNumbers) => noNumbers.some(n => n > 0))();
 >noNumbers : Symbol(noNumbers, Decl(contextuallyTypedIifeStrict.ts, 19, 2))
->noNumbers.some : Symbol(Array.some, Decl(lib.d.ts, --, --))
+>noNumbers.some : Symbol(Array.some, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >noNumbers : Symbol(noNumbers, Decl(contextuallyTypedIifeStrict.ts, 19, 2))
->some : Symbol(Array.some, Decl(lib.d.ts, --, --))
+>some : Symbol(Array.some, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >n : Symbol(n, Decl(contextuallyTypedIifeStrict.ts, 19, 34))
 >n : Symbol(n, Decl(contextuallyTypedIifeStrict.ts, 19, 34))
 
@@ -73,9 +73,9 @@
 >first : Symbol(first, Decl(contextuallyTypedIifeStrict.ts, 20, 2))
 >rest : Symbol(rest, Decl(contextuallyTypedIifeStrict.ts, 20, 8))
 >first : Symbol(first, Decl(contextuallyTypedIifeStrict.ts, 20, 2))
->rest.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>rest.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >rest : Symbol(rest, Decl(contextuallyTypedIifeStrict.ts, 20, 8))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >n : Symbol(n, Decl(contextuallyTypedIifeStrict.ts, 20, 43))
 >n : Symbol(n, Decl(contextuallyTypedIifeStrict.ts, 20, 43))
 
diff --git a/tests/baselines/reference/contextuallyTypedIifeStrict.types b/tests/baselines/reference/contextuallyTypedIifeStrict.types
index cbeee53ec2e..0f888f98277 100644
--- a/tests/baselines/reference/contextuallyTypedIifeStrict.types
+++ b/tests/baselines/reference/contextuallyTypedIifeStrict.types
@@ -105,10 +105,10 @@
 >(...numbers) => numbers.every(n => n > 0) : (...numbers: number[]) => boolean
 >numbers : number[]
 >numbers.every(n => n > 0) : boolean
->numbers.every : (callbackfn: (value: number, index: number, array: number[]) => boolean, thisArg?: any) => boolean
+>numbers.every : { (callbackfn: (this: undefined, value: number, index: number, array: number[]) => boolean): boolean; (callbackfn: (this: undefined, value: number, index: number, array: number[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: number, index: number, array: number[]) => boolean, thisArg: Z): boolean; }
 >numbers : number[]
->every : (callbackfn: (value: number, index: number, array: number[]) => boolean, thisArg?: any) => boolean
->n => n > 0 : (n: number) => boolean
+>every : { (callbackfn: (this: undefined, value: number, index: number, array: number[]) => boolean): boolean; (callbackfn: (this: undefined, value: number, index: number, array: number[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: number, index: number, array: number[]) => boolean, thisArg: Z): boolean; }
+>n => n > 0 : (this: undefined, n: number) => boolean
 >n : number
 >n > 0 : boolean
 >n : number
@@ -123,10 +123,10 @@
 >(...mixed) => mixed.every(n => !!n) : (...mixed: (string | number)[]) => boolean
 >mixed : (string | number)[]
 >mixed.every(n => !!n) : boolean
->mixed.every : (callbackfn: (value: string | number, index: number, array: (string | number)[]) => boolean, thisArg?: any) => boolean
+>mixed.every : { (callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => boolean): boolean; (callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: string | number, index: number, array: (string | number)[]) => boolean, thisArg: Z): boolean; }
 >mixed : (string | number)[]
->every : (callbackfn: (value: string | number, index: number, array: (string | number)[]) => boolean, thisArg?: any) => boolean
->n => !!n : (n: string | number) => boolean
+>every : { (callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => boolean): boolean; (callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: string | number, index: number, array: (string | number)[]) => boolean, thisArg: Z): boolean; }
+>n => !!n : (this: undefined, n: string | number) => boolean
 >n : string | number
 >!!n : boolean
 >!n : boolean
@@ -141,10 +141,10 @@
 >(...noNumbers) => noNumbers.some(n => n > 0) : (...noNumbers: any[]) => boolean
 >noNumbers : any[]
 >noNumbers.some(n => n > 0) : boolean
->noNumbers.some : (callbackfn: (value: any, index: number, array: any[]) => boolean, thisArg?: any) => boolean
+>noNumbers.some : { (callbackfn: (this: undefined, value: any, index: number, array: any[]) => boolean): boolean; (callbackfn: (this: undefined, value: any, index: number, array: any[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: any, index: number, array: any[]) => boolean, thisArg: Z): boolean; }
 >noNumbers : any[]
->some : (callbackfn: (value: any, index: number, array: any[]) => boolean, thisArg?: any) => boolean
->n => n > 0 : (n: any) => boolean
+>some : { (callbackfn: (this: undefined, value: any, index: number, array: any[]) => boolean): boolean; (callbackfn: (this: undefined, value: any, index: number, array: any[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: any, index: number, array: any[]) => boolean, thisArg: Z): boolean; }
+>n => n > 0 : (this: undefined, n: any) => boolean
 >n : any
 >n > 0 : boolean
 >n : any
@@ -160,10 +160,10 @@
 >first : number
 >[] : never[]
 >rest.map(n => n > 0) : boolean[]
->rest.map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
+>rest.map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
 >rest : number[]
->map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
->n => n > 0 : (n: number) => boolean
+>map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
+>n => n > 0 : (this: undefined, n: number) => boolean
 >n : number
 >n > 0 : boolean
 >n : number
diff --git a/tests/baselines/reference/controlFlowDestructuringParameters.symbols b/tests/baselines/reference/controlFlowDestructuringParameters.symbols
index 58d2edfc12c..1874c16c3d3 100644
--- a/tests/baselines/reference/controlFlowDestructuringParameters.symbols
+++ b/tests/baselines/reference/controlFlowDestructuringParameters.symbols
@@ -3,9 +3,9 @@
 
 
 [{ x: 1 }].map(
->[{ x: 1 }].map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>[{ x: 1 }].map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >x : Symbol(x, Decl(controlFlowDestructuringParameters.ts, 3, 2))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 
   ({ x }) => x
 >x : Symbol(x, Decl(controlFlowDestructuringParameters.ts, 4, 4))
diff --git a/tests/baselines/reference/controlFlowDestructuringParameters.types b/tests/baselines/reference/controlFlowDestructuringParameters.types
index c38a8fb1aa4..d1adadfee17 100644
--- a/tests/baselines/reference/controlFlowDestructuringParameters.types
+++ b/tests/baselines/reference/controlFlowDestructuringParameters.types
@@ -4,15 +4,15 @@
 
 [{ x: 1 }].map(
 >[{ x: 1 }].map(  ({ x }) => x) : number[]
->[{ x: 1 }].map : { <U>(this: [{ x: number; }, { x: number; }, { x: number; }, { x: number; }, { x: number; }], callbackfn: (value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [{ x: number; }, { x: number; }, { x: number; }, { x: number; }], callbackfn: (value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [{ x: number; }, { x: number; }, { x: number; }], callbackfn: (value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg?: any): [U, U, U]; <U>(this: [{ x: number; }, { x: number; }], callbackfn: (value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg?: any): U[]; }
+>[{ x: 1 }].map : { <U>(this: [{ x: number; }, { x: number; }, { x: number; }, { x: number; }, { x: number; }], callbackfn: (this: undefined, value: { x: number; }, index: number, array: { x: number; }[]) => U): [U, U, U, U, U]; <U>(this: [{ x: number; }, { x: number; }, { x: number; }, { x: number; }, { x: number; }], callbackfn: (this: undefined, value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [{ x: number; }, { x: number; }, { x: number; }, { x: number; }, { x: number; }], callbackfn: (this: Z, value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [{ x: number; }, { x: number; }, { x: number; }, { x: number; }], callbackfn: (this: undefined, value: { x: number; }, index: number, array: { x: number; }[]) => U): [U, U, U, U]; <U>(this: [{ x: number; }, { x: number; }, { x: number; }, { x: number; }], callbackfn: (this: undefined, value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [{ x: number; }, { x: number; }, { x: number; }, { x: number; }], callbackfn: (this: Z, value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [{ x: number; }, { x: number; }, { x: number; }], callbackfn: (this: undefined, value: { x: number; }, index: number, array: { x: number; }[]) => U): [U, U, U]; <U>(this: [{ x: number; }, { x: number; }, { x: number; }], callbackfn: (this: undefined, value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [{ x: number; }, { x: number; }, { x: number; }], callbackfn: (this: Z, value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg: Z): [U, U, U]; <U>(this: [{ x: number; }, { x: number; }], callbackfn: (this: undefined, value: { x: number; }, index: number, array: { x: number; }[]) => U): [U, U]; <U>(this: [{ x: number; }, { x: number; }], callbackfn: (this: undefined, value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [{ x: number; }, { x: number; }], callbackfn: (this: Z, value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: { x: number; }, index: number, array: { x: number; }[]) => U): U[]; <U>(callbackfn: (this: undefined, value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg: Z): U[]; }
 >[{ x: 1 }] : { x: number; }[]
 >{ x: 1 } : { x: number; }
 >x : number
 >1 : 1
->map : { <U>(this: [{ x: number; }, { x: number; }, { x: number; }, { x: number; }, { x: number; }], callbackfn: (value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [{ x: number; }, { x: number; }, { x: number; }, { x: number; }], callbackfn: (value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [{ x: number; }, { x: number; }, { x: number; }], callbackfn: (value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg?: any): [U, U, U]; <U>(this: [{ x: number; }, { x: number; }], callbackfn: (value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg?: any): U[]; }
+>map : { <U>(this: [{ x: number; }, { x: number; }, { x: number; }, { x: number; }, { x: number; }], callbackfn: (this: undefined, value: { x: number; }, index: number, array: { x: number; }[]) => U): [U, U, U, U, U]; <U>(this: [{ x: number; }, { x: number; }, { x: number; }, { x: number; }, { x: number; }], callbackfn: (this: undefined, value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [{ x: number; }, { x: number; }, { x: number; }, { x: number; }, { x: number; }], callbackfn: (this: Z, value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [{ x: number; }, { x: number; }, { x: number; }, { x: number; }], callbackfn: (this: undefined, value: { x: number; }, index: number, array: { x: number; }[]) => U): [U, U, U, U]; <U>(this: [{ x: number; }, { x: number; }, { x: number; }, { x: number; }], callbackfn: (this: undefined, value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [{ x: number; }, { x: number; }, { x: number; }, { x: number; }], callbackfn: (this: Z, value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [{ x: number; }, { x: number; }, { x: number; }], callbackfn: (this: undefined, value: { x: number; }, index: number, array: { x: number; }[]) => U): [U, U, U]; <U>(this: [{ x: number; }, { x: number; }, { x: number; }], callbackfn: (this: undefined, value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [{ x: number; }, { x: number; }, { x: number; }], callbackfn: (this: Z, value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg: Z): [U, U, U]; <U>(this: [{ x: number; }, { x: number; }], callbackfn: (this: undefined, value: { x: number; }, index: number, array: { x: number; }[]) => U): [U, U]; <U>(this: [{ x: number; }, { x: number; }], callbackfn: (this: undefined, value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [{ x: number; }, { x: number; }], callbackfn: (this: Z, value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: { x: number; }, index: number, array: { x: number; }[]) => U): U[]; <U>(callbackfn: (this: undefined, value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: { x: number; }, index: number, array: { x: number; }[]) => U, thisArg: Z): U[]; }
 
   ({ x }) => x
->({ x }) => x : ({x}: { x: number; }) => number
+>({ x }) => x : (this: undefined, {x}: { x: number; }) => number
 >x : number
 >x : number
 
diff --git a/tests/baselines/reference/controlFlowPropertyDeclarations.symbols b/tests/baselines/reference/controlFlowPropertyDeclarations.symbols
index 8e87d71ae33..fdaa61c2e2d 100644
--- a/tests/baselines/reference/controlFlowPropertyDeclarations.symbols
+++ b/tests/baselines/reference/controlFlowPropertyDeclarations.symbols
@@ -220,15 +220,15 @@ export class HTMLtoJSX {
       // wrapping newlines and sequences of two or more spaces in variables.
       text = text
 >text : Symbol(text, Decl(controlFlowPropertyDeclarations.ts, 113, 7))
->text        .replace(/\r/g, '')        .replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
->text        .replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>text        .replace(/\r/g, '')        .replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>text        .replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >text : Symbol(text, Decl(controlFlowPropertyDeclarations.ts, 113, 7))
 
         .replace(/\r/g, '')
->replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 
         .replace(/( {2,}|\n|\t|\{|\})/g, function(whitespace) {
->replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >whitespace : Symbol(whitespace, Decl(controlFlowPropertyDeclarations.ts, 121, 50))
 
           return '{' + JSON.stringify(whitespace) + '}';
diff --git a/tests/baselines/reference/controlFlowPropertyDeclarations.types b/tests/baselines/reference/controlFlowPropertyDeclarations.types
index fae5ed27da2..286124ca346 100644
--- a/tests/baselines/reference/controlFlowPropertyDeclarations.types
+++ b/tests/baselines/reference/controlFlowPropertyDeclarations.types
@@ -295,18 +295,18 @@ export class HTMLtoJSX {
 >text = text        .replace(/\r/g, '')        .replace(/( {2,}|\n|\t|\{|\})/g, function(whitespace) {          return '{' + JSON.stringify(whitespace) + '}';        }) : string
 >text : string
 >text        .replace(/\r/g, '')        .replace(/( {2,}|\n|\t|\{|\})/g, function(whitespace) {          return '{' + JSON.stringify(whitespace) + '}';        }) : string
->text        .replace(/\r/g, '')        .replace : { (searchValue: string, replaceValue: string): string; (searchValue: string, replacer: (substring: string, ...args: any[]) => string): string; (searchValue: RegExp, replaceValue: string): string; (searchValue: RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
+>text        .replace(/\r/g, '')        .replace : { (searchValue: string | RegExp, replaceValue: string): string; (searchValue: string | RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
 >text        .replace(/\r/g, '') : string
->text        .replace : { (searchValue: string, replaceValue: string): string; (searchValue: string, replacer: (substring: string, ...args: any[]) => string): string; (searchValue: RegExp, replaceValue: string): string; (searchValue: RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
+>text        .replace : { (searchValue: string | RegExp, replaceValue: string): string; (searchValue: string | RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
 >text : string
 
         .replace(/\r/g, '')
->replace : { (searchValue: string, replaceValue: string): string; (searchValue: string, replacer: (substring: string, ...args: any[]) => string): string; (searchValue: RegExp, replaceValue: string): string; (searchValue: RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
+>replace : { (searchValue: string | RegExp, replaceValue: string): string; (searchValue: string | RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
 >/\r/g : RegExp
 >'' : ""
 
         .replace(/( {2,}|\n|\t|\{|\})/g, function(whitespace) {
->replace : { (searchValue: string, replaceValue: string): string; (searchValue: string, replacer: (substring: string, ...args: any[]) => string): string; (searchValue: RegExp, replaceValue: string): string; (searchValue: RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
+>replace : { (searchValue: string | RegExp, replaceValue: string): string; (searchValue: string | RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
 >/( {2,}|\n|\t|\{|\})/g : RegExp
 >function(whitespace) {          return '{' + JSON.stringify(whitespace) + '}';        } : (whitespace: string) => string
 >whitespace : string
diff --git a/tests/baselines/reference/declarationEmitPromise.symbols b/tests/baselines/reference/declarationEmitPromise.symbols
index 2c37e1dfa78..23d00ec6386 100644
--- a/tests/baselines/reference/declarationEmitPromise.symbols
+++ b/tests/baselines/reference/declarationEmitPromise.symbols
@@ -40,13 +40,13 @@ export async function runSampleWorks<A, B, C, D, E>(
 >bluebird.all : Symbol(bluebird.all, Decl(declarationEmitPromise.ts, 1, 26))
 >bluebird : Symbol(bluebird, Decl(declarationEmitPromise.ts, 0, 0))
 >all : Symbol(bluebird.all, Decl(declarationEmitPromise.ts, 1, 26))
->[a, b, c, d, e].filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --))
+>[a, b, c, d, e].filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
 >a : Symbol(a, Decl(declarationEmitPromise.ts, 5, 52))
 >b : Symbol(b, Decl(declarationEmitPromise.ts, 6, 19))
 >c : Symbol(c, Decl(declarationEmitPromise.ts, 6, 36))
 >d : Symbol(d, Decl(declarationEmitPromise.ts, 6, 53))
 >e : Symbol(e, Decl(declarationEmitPromise.ts, 6, 70))
->filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --))
+>filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
 >el : Symbol(el, Decl(declarationEmitPromise.ts, 7, 68))
 >el : Symbol(el, Decl(declarationEmitPromise.ts, 7, 68))
 
@@ -112,13 +112,13 @@ export async function runSampleBreaks<A, B, C, D, E>(
 >bluebird.all : Symbol(bluebird.all, Decl(declarationEmitPromise.ts, 1, 26))
 >bluebird : Symbol(bluebird, Decl(declarationEmitPromise.ts, 0, 0))
 >all : Symbol(bluebird.all, Decl(declarationEmitPromise.ts, 1, 26))
->[a, b, c, d, e].filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --))
+>[a, b, c, d, e].filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
 >a : Symbol(a, Decl(declarationEmitPromise.ts, 14, 53))
 >b : Symbol(b, Decl(declarationEmitPromise.ts, 15, 19))
 >c : Symbol(c, Decl(declarationEmitPromise.ts, 15, 36))
 >d : Symbol(d, Decl(declarationEmitPromise.ts, 15, 53))
 >e : Symbol(e, Decl(declarationEmitPromise.ts, 15, 70))
->filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --))
+>filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
 >el : Symbol(el, Decl(declarationEmitPromise.ts, 16, 68))
 >el : Symbol(el, Decl(declarationEmitPromise.ts, 16, 68))
 
diff --git a/tests/baselines/reference/declarationEmitPromise.types b/tests/baselines/reference/declarationEmitPromise.types
index 4edaa444326..3cdf63ef478 100644
--- a/tests/baselines/reference/declarationEmitPromise.types
+++ b/tests/baselines/reference/declarationEmitPromise.types
@@ -45,15 +45,15 @@ export async function runSampleWorks<A, B, C, D, E>(
 >bluebird : typeof bluebird
 >all : bluebird<any>[]
 >[a, b, c, d, e].filter(el => !!el) : bluebird<A>[]
->[a, b, c, d, e].filter : (callbackfn: (value: bluebird<A>, index: number, array: bluebird<A>[]) => any, thisArg?: any) => bluebird<A>[]
+>[a, b, c, d, e].filter : { (callbackfn: (this: undefined, value: bluebird<A>, index: number, array: bluebird<A>[]) => any): bluebird<A>[]; (callbackfn: (this: undefined, value: bluebird<A>, index: number, array: bluebird<A>[]) => any, thisArg: undefined): bluebird<A>[]; <Z>(callbackfn: (this: Z, value: bluebird<A>, index: number, array: bluebird<A>[]) => any, thisArg: Z): bluebird<A>[]; }
 >[a, b, c, d, e] : bluebird<A>[]
 >a : bluebird<A>
 >b : bluebird<B>
 >c : bluebird<C>
 >d : bluebird<D>
 >e : bluebird<E>
->filter : (callbackfn: (value: bluebird<A>, index: number, array: bluebird<A>[]) => any, thisArg?: any) => bluebird<A>[]
->el => !!el : (el: bluebird<A>) => boolean
+>filter : { (callbackfn: (this: undefined, value: bluebird<A>, index: number, array: bluebird<A>[]) => any): bluebird<A>[]; (callbackfn: (this: undefined, value: bluebird<A>, index: number, array: bluebird<A>[]) => any, thisArg: undefined): bluebird<A>[]; <Z>(callbackfn: (this: Z, value: bluebird<A>, index: number, array: bluebird<A>[]) => any, thisArg: Z): bluebird<A>[]; }
+>el => !!el : (this: undefined, el: bluebird<A>) => boolean
 >el : bluebird<A>
 >!!el : boolean
 >!el : boolean
@@ -130,15 +130,15 @@ export async function runSampleBreaks<A, B, C, D, E>(
 >bluebird : typeof bluebird
 >all : bluebird<any>[]
 >[a, b, c, d, e].filter(el => !!el) : bluebird<A>[]
->[a, b, c, d, e].filter : (callbackfn: (value: bluebird<A>, index: number, array: bluebird<A>[]) => any, thisArg?: any) => bluebird<A>[]
+>[a, b, c, d, e].filter : { (callbackfn: (this: undefined, value: bluebird<A>, index: number, array: bluebird<A>[]) => any): bluebird<A>[]; (callbackfn: (this: undefined, value: bluebird<A>, index: number, array: bluebird<A>[]) => any, thisArg: undefined): bluebird<A>[]; <Z>(callbackfn: (this: Z, value: bluebird<A>, index: number, array: bluebird<A>[]) => any, thisArg: Z): bluebird<A>[]; }
 >[a, b, c, d, e] : bluebird<A>[]
 >a : bluebird<A>
 >b : bluebird<B>
 >c : bluebird<C>
 >d : bluebird<D>
 >e : bluebird<E>
->filter : (callbackfn: (value: bluebird<A>, index: number, array: bluebird<A>[]) => any, thisArg?: any) => bluebird<A>[]
->el => !!el : (el: bluebird<A>) => boolean
+>filter : { (callbackfn: (this: undefined, value: bluebird<A>, index: number, array: bluebird<A>[]) => any): bluebird<A>[]; (callbackfn: (this: undefined, value: bluebird<A>, index: number, array: bluebird<A>[]) => any, thisArg: undefined): bluebird<A>[]; <Z>(callbackfn: (this: Z, value: bluebird<A>, index: number, array: bluebird<A>[]) => any, thisArg: Z): bluebird<A>[]; }
+>el => !!el : (this: undefined, el: bluebird<A>) => boolean
 >el : bluebird<A>
 >!!el : boolean
 >!el : boolean
diff --git a/tests/baselines/reference/enumIndexer.symbols b/tests/baselines/reference/enumIndexer.symbols
index 79baee66498..cf87cb106d1 100644
--- a/tests/baselines/reference/enumIndexer.symbols
+++ b/tests/baselines/reference/enumIndexer.symbols
@@ -19,9 +19,9 @@ var enumValue = MyEnumType.foo;
 
 var x = _arr.map(o => MyEnumType[o.key] === enumValue); // these are not same type
 >x : Symbol(x, Decl(enumIndexer.ts, 5, 3))
->_arr.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>_arr.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >_arr : Symbol(_arr, Decl(enumIndexer.ts, 3, 3))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >o : Symbol(o, Decl(enumIndexer.ts, 5, 17))
 >MyEnumType : Symbol(MyEnumType, Decl(enumIndexer.ts, 0, 0))
 >o.key : Symbol(key, Decl(enumIndexer.ts, 3, 13))
diff --git a/tests/baselines/reference/enumIndexer.types b/tests/baselines/reference/enumIndexer.types
index 3abd7eaaa4c..981ad5c8c81 100644
--- a/tests/baselines/reference/enumIndexer.types
+++ b/tests/baselines/reference/enumIndexer.types
@@ -25,10 +25,10 @@ var enumValue = MyEnumType.foo;
 var x = _arr.map(o => MyEnumType[o.key] === enumValue); // these are not same type
 >x : boolean[]
 >_arr.map(o => MyEnumType[o.key] === enumValue) : boolean[]
->_arr.map : { <U>(this: [{ key: string; }, { key: string; }, { key: string; }, { key: string; }, { key: string; }], callbackfn: (value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [{ key: string; }, { key: string; }, { key: string; }, { key: string; }], callbackfn: (value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [{ key: string; }, { key: string; }, { key: string; }], callbackfn: (value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg?: any): [U, U, U]; <U>(this: [{ key: string; }, { key: string; }], callbackfn: (value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg?: any): U[]; }
+>_arr.map : { <U>(this: [{ key: string; }, { key: string; }, { key: string; }, { key: string; }, { key: string; }], callbackfn: (this: undefined, value: { key: string; }, index: number, array: { key: string; }[]) => U): [U, U, U, U, U]; <U>(this: [{ key: string; }, { key: string; }, { key: string; }, { key: string; }, { key: string; }], callbackfn: (this: undefined, value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [{ key: string; }, { key: string; }, { key: string; }, { key: string; }, { key: string; }], callbackfn: (this: Z, value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [{ key: string; }, { key: string; }, { key: string; }, { key: string; }], callbackfn: (this: undefined, value: { key: string; }, index: number, array: { key: string; }[]) => U): [U, U, U, U]; <U>(this: [{ key: string; }, { key: string; }, { key: string; }, { key: string; }], callbackfn: (this: undefined, value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [{ key: string; }, { key: string; }, { key: string; }, { key: string; }], callbackfn: (this: Z, value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [{ key: string; }, { key: string; }, { key: string; }], callbackfn: (this: undefined, value: { key: string; }, index: number, array: { key: string; }[]) => U): [U, U, U]; <U>(this: [{ key: string; }, { key: string; }, { key: string; }], callbackfn: (this: undefined, value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [{ key: string; }, { key: string; }, { key: string; }], callbackfn: (this: Z, value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg: Z): [U, U, U]; <U>(this: [{ key: string; }, { key: string; }], callbackfn: (this: undefined, value: { key: string; }, index: number, array: { key: string; }[]) => U): [U, U]; <U>(this: [{ key: string; }, { key: string; }], callbackfn: (this: undefined, value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [{ key: string; }, { key: string; }], callbackfn: (this: Z, value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: { key: string; }, index: number, array: { key: string; }[]) => U): U[]; <U>(callbackfn: (this: undefined, value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg: Z): U[]; }
 >_arr : { key: string; }[]
->map : { <U>(this: [{ key: string; }, { key: string; }, { key: string; }, { key: string; }, { key: string; }], callbackfn: (value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [{ key: string; }, { key: string; }, { key: string; }, { key: string; }], callbackfn: (value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [{ key: string; }, { key: string; }, { key: string; }], callbackfn: (value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg?: any): [U, U, U]; <U>(this: [{ key: string; }, { key: string; }], callbackfn: (value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg?: any): U[]; }
->o => MyEnumType[o.key] === enumValue : (o: { key: string; }) => boolean
+>map : { <U>(this: [{ key: string; }, { key: string; }, { key: string; }, { key: string; }, { key: string; }], callbackfn: (this: undefined, value: { key: string; }, index: number, array: { key: string; }[]) => U): [U, U, U, U, U]; <U>(this: [{ key: string; }, { key: string; }, { key: string; }, { key: string; }, { key: string; }], callbackfn: (this: undefined, value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [{ key: string; }, { key: string; }, { key: string; }, { key: string; }, { key: string; }], callbackfn: (this: Z, value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [{ key: string; }, { key: string; }, { key: string; }, { key: string; }], callbackfn: (this: undefined, value: { key: string; }, index: number, array: { key: string; }[]) => U): [U, U, U, U]; <U>(this: [{ key: string; }, { key: string; }, { key: string; }, { key: string; }], callbackfn: (this: undefined, value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [{ key: string; }, { key: string; }, { key: string; }, { key: string; }], callbackfn: (this: Z, value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [{ key: string; }, { key: string; }, { key: string; }], callbackfn: (this: undefined, value: { key: string; }, index: number, array: { key: string; }[]) => U): [U, U, U]; <U>(this: [{ key: string; }, { key: string; }, { key: string; }], callbackfn: (this: undefined, value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [{ key: string; }, { key: string; }, { key: string; }], callbackfn: (this: Z, value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg: Z): [U, U, U]; <U>(this: [{ key: string; }, { key: string; }], callbackfn: (this: undefined, value: { key: string; }, index: number, array: { key: string; }[]) => U): [U, U]; <U>(this: [{ key: string; }, { key: string; }], callbackfn: (this: undefined, value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [{ key: string; }, { key: string; }], callbackfn: (this: Z, value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: { key: string; }, index: number, array: { key: string; }[]) => U): U[]; <U>(callbackfn: (this: undefined, value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: { key: string; }, index: number, array: { key: string; }[]) => U, thisArg: Z): U[]; }
+>o => MyEnumType[o.key] === enumValue : (this: undefined, o: { key: string; }) => boolean
 >o : { key: string; }
 >MyEnumType[o.key] === enumValue : boolean
 >MyEnumType[o.key] : any
diff --git a/tests/baselines/reference/genericArray1.symbols b/tests/baselines/reference/genericArray1.symbols
index a96b487f1d7..f548f34e553 100644
--- a/tests/baselines/reference/genericArray1.symbols
+++ b/tests/baselines/reference/genericArray1.symbols
@@ -13,8 +13,8 @@ interface String{
 
 var lengths = ["a", "b", "c"].map(x => x.length);
 >lengths : Symbol(lengths, Decl(genericArray1.ts, 12, 3))
->["a", "b", "c"].map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>["a", "b", "c"].map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >x : Symbol(x, Decl(genericArray1.ts, 12, 34))
 >x.length : Symbol(String.length, Decl(lib.d.ts, --, --))
 >x : Symbol(x, Decl(genericArray1.ts, 12, 34))
diff --git a/tests/baselines/reference/genericArray1.types b/tests/baselines/reference/genericArray1.types
index 68d691a96e3..b893d9778fc 100644
--- a/tests/baselines/reference/genericArray1.types
+++ b/tests/baselines/reference/genericArray1.types
@@ -14,13 +14,13 @@ interface String{
 var lengths = ["a", "b", "c"].map(x => x.length);
 >lengths : number[]
 >["a", "b", "c"].map(x => x.length) : number[]
->["a", "b", "c"].map : { <U>(this: [string, string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U]; <U>(this: [string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): U[]; }
+>["a", "b", "c"].map : { <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U, U]; <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [string, string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): U[]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): U[]; }
 >["a", "b", "c"] : string[]
 >"a" : "a"
 >"b" : "b"
 >"c" : "c"
->map : { <U>(this: [string, string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U]; <U>(this: [string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): U[]; }
->x => x.length : (x: string) => number
+>map : { <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U, U]; <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [string, string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): U[]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): U[]; }
+>x => x.length : (this: undefined, x: string) => number
 >x : string
 >x.length : number
 >x : string
diff --git a/tests/baselines/reference/genericInference1.symbols b/tests/baselines/reference/genericInference1.symbols
index 7fc39ac556f..ecc9c811d76 100644
--- a/tests/baselines/reference/genericInference1.symbols
+++ b/tests/baselines/reference/genericInference1.symbols
@@ -1,7 +1,7 @@
 === tests/cases/compiler/genericInference1.ts ===
 ['a', 'b', 'c'].map(x => x.length);
->['a', 'b', 'c'].map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>['a', 'b', 'c'].map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >x : Symbol(x, Decl(genericInference1.ts, 0, 20))
 >x.length : Symbol(String.length, Decl(lib.d.ts, --, --))
 >x : Symbol(x, Decl(genericInference1.ts, 0, 20))
diff --git a/tests/baselines/reference/genericInference1.types b/tests/baselines/reference/genericInference1.types
index ddf8d762000..64ff2c399cd 100644
--- a/tests/baselines/reference/genericInference1.types
+++ b/tests/baselines/reference/genericInference1.types
@@ -1,13 +1,13 @@
 === tests/cases/compiler/genericInference1.ts ===
 ['a', 'b', 'c'].map(x => x.length);
 >['a', 'b', 'c'].map(x => x.length) : number[]
->['a', 'b', 'c'].map : { <U>(this: [string, string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U]; <U>(this: [string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): U[]; }
+>['a', 'b', 'c'].map : { <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U, U]; <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [string, string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): U[]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): U[]; }
 >['a', 'b', 'c'] : string[]
 >'a' : "a"
 >'b' : "b"
 >'c' : "c"
->map : { <U>(this: [string, string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U]; <U>(this: [string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): U[]; }
->x => x.length : (x: string) => number
+>map : { <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U, U]; <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [string, string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): U[]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): U[]; }
+>x => x.length : (this: undefined, x: string) => number
 >x : string
 >x.length : number
 >x : string
diff --git a/tests/baselines/reference/genericMethodOverspecialization.symbols b/tests/baselines/reference/genericMethodOverspecialization.symbols
index 5fd2a0479e6..55ff9cb5afb 100644
--- a/tests/baselines/reference/genericMethodOverspecialization.symbols
+++ b/tests/baselines/reference/genericMethodOverspecialization.symbols
@@ -27,9 +27,9 @@ interface Document {
 
 var elements = names.map(function (name) {
 >elements : Symbol(elements, Decl(genericMethodOverspecialization.ts, 12, 3))
->names.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>names.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >names : Symbol(names, Decl(genericMethodOverspecialization.ts, 0, 3))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >name : Symbol(name, Decl(genericMethodOverspecialization.ts, 12, 35))
 
     return document.getElementById(name);
@@ -43,9 +43,9 @@ var elements = names.map(function (name) {
 
 var xxx = elements.filter(function (e) {
 >xxx : Symbol(xxx, Decl(genericMethodOverspecialization.ts, 17, 3))
->elements.filter : Symbol(Array.filter, Decl(lib.d.ts, --, --))
+>elements.filter : Symbol(Array.filter, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >elements : Symbol(elements, Decl(genericMethodOverspecialization.ts, 12, 3))
->filter : Symbol(Array.filter, Decl(lib.d.ts, --, --))
+>filter : Symbol(Array.filter, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >e : Symbol(e, Decl(genericMethodOverspecialization.ts, 17, 36))
 
     return !e.isDisabled;
@@ -57,9 +57,9 @@ var xxx = elements.filter(function (e) {
 
 var widths:number[] = elements.map(function (e) { // should not error
 >widths : Symbol(widths, Decl(genericMethodOverspecialization.ts, 21, 3))
->elements.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>elements.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >elements : Symbol(elements, Decl(genericMethodOverspecialization.ts, 12, 3))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >e : Symbol(e, Decl(genericMethodOverspecialization.ts, 21, 45))
 
     return e.clientWidth;
diff --git a/tests/baselines/reference/genericMethodOverspecialization.types b/tests/baselines/reference/genericMethodOverspecialization.types
index 0f90bd34e2e..36b710b742c 100644
--- a/tests/baselines/reference/genericMethodOverspecialization.types
+++ b/tests/baselines/reference/genericMethodOverspecialization.types
@@ -34,10 +34,10 @@ interface Document {
 var elements = names.map(function (name) {
 >elements : HTMLElement[]
 >names.map(function (name) {    return document.getElementById(name);}) : HTMLElement[]
->names.map : { <U>(this: [string, string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U]; <U>(this: [string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): U[]; }
+>names.map : { <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U, U]; <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [string, string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): U[]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): U[]; }
 >names : string[]
->map : { <U>(this: [string, string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U]; <U>(this: [string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): U[]; }
->function (name) {    return document.getElementById(name);} : (name: string) => HTMLElement
+>map : { <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U, U]; <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [string, string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): U[]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): U[]; }
+>function (name) {    return document.getElementById(name);} : (this: undefined, name: string) => HTMLElement
 >name : string
 
     return document.getElementById(name);
@@ -53,10 +53,10 @@ var elements = names.map(function (name) {
 var xxx = elements.filter(function (e) {
 >xxx : HTMLElement[]
 >elements.filter(function (e) {    return !e.isDisabled;}) : HTMLElement[]
->elements.filter : (callbackfn: (value: HTMLElement, index: number, array: HTMLElement[]) => any, thisArg?: any) => HTMLElement[]
+>elements.filter : { (callbackfn: (this: undefined, value: HTMLElement, index: number, array: HTMLElement[]) => any): HTMLElement[]; (callbackfn: (this: undefined, value: HTMLElement, index: number, array: HTMLElement[]) => any, thisArg: undefined): HTMLElement[]; <Z>(callbackfn: (this: Z, value: HTMLElement, index: number, array: HTMLElement[]) => any, thisArg: Z): HTMLElement[]; }
 >elements : HTMLElement[]
->filter : (callbackfn: (value: HTMLElement, index: number, array: HTMLElement[]) => any, thisArg?: any) => HTMLElement[]
->function (e) {    return !e.isDisabled;} : (e: HTMLElement) => boolean
+>filter : { (callbackfn: (this: undefined, value: HTMLElement, index: number, array: HTMLElement[]) => any): HTMLElement[]; (callbackfn: (this: undefined, value: HTMLElement, index: number, array: HTMLElement[]) => any, thisArg: undefined): HTMLElement[]; <Z>(callbackfn: (this: Z, value: HTMLElement, index: number, array: HTMLElement[]) => any, thisArg: Z): HTMLElement[]; }
+>function (e) {    return !e.isDisabled;} : (this: undefined, e: HTMLElement) => boolean
 >e : HTMLElement
 
     return !e.isDisabled;
@@ -70,10 +70,10 @@ var xxx = elements.filter(function (e) {
 var widths:number[] = elements.map(function (e) { // should not error
 >widths : number[]
 >elements.map(function (e) { // should not error    return e.clientWidth;}) : number[]
->elements.map : { <U>(this: [HTMLElement, HTMLElement, HTMLElement, HTMLElement, HTMLElement], callbackfn: (value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [HTMLElement, HTMLElement, HTMLElement, HTMLElement], callbackfn: (value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [HTMLElement, HTMLElement, HTMLElement], callbackfn: (value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg?: any): [U, U, U]; <U>(this: [HTMLElement, HTMLElement], callbackfn: (value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg?: any): U[]; }
+>elements.map : { <U>(this: [HTMLElement, HTMLElement, HTMLElement, HTMLElement, HTMLElement], callbackfn: (this: undefined, value: HTMLElement, index: number, array: HTMLElement[]) => U): [U, U, U, U, U]; <U>(this: [HTMLElement, HTMLElement, HTMLElement, HTMLElement, HTMLElement], callbackfn: (this: undefined, value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [HTMLElement, HTMLElement, HTMLElement, HTMLElement, HTMLElement], callbackfn: (this: Z, value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [HTMLElement, HTMLElement, HTMLElement, HTMLElement], callbackfn: (this: undefined, value: HTMLElement, index: number, array: HTMLElement[]) => U): [U, U, U, U]; <U>(this: [HTMLElement, HTMLElement, HTMLElement, HTMLElement], callbackfn: (this: undefined, value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [HTMLElement, HTMLElement, HTMLElement, HTMLElement], callbackfn: (this: Z, value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [HTMLElement, HTMLElement, HTMLElement], callbackfn: (this: undefined, value: HTMLElement, index: number, array: HTMLElement[]) => U): [U, U, U]; <U>(this: [HTMLElement, HTMLElement, HTMLElement], callbackfn: (this: undefined, value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [HTMLElement, HTMLElement, HTMLElement], callbackfn: (this: Z, value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg: Z): [U, U, U]; <U>(this: [HTMLElement, HTMLElement], callbackfn: (this: undefined, value: HTMLElement, index: number, array: HTMLElement[]) => U): [U, U]; <U>(this: [HTMLElement, HTMLElement], callbackfn: (this: undefined, value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [HTMLElement, HTMLElement], callbackfn: (this: Z, value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: HTMLElement, index: number, array: HTMLElement[]) => U): U[]; <U>(callbackfn: (this: undefined, value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg: Z): U[]; }
 >elements : HTMLElement[]
->map : { <U>(this: [HTMLElement, HTMLElement, HTMLElement, HTMLElement, HTMLElement], callbackfn: (value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [HTMLElement, HTMLElement, HTMLElement, HTMLElement], callbackfn: (value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [HTMLElement, HTMLElement, HTMLElement], callbackfn: (value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg?: any): [U, U, U]; <U>(this: [HTMLElement, HTMLElement], callbackfn: (value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg?: any): U[]; }
->function (e) { // should not error    return e.clientWidth;} : (e: HTMLElement) => number
+>map : { <U>(this: [HTMLElement, HTMLElement, HTMLElement, HTMLElement, HTMLElement], callbackfn: (this: undefined, value: HTMLElement, index: number, array: HTMLElement[]) => U): [U, U, U, U, U]; <U>(this: [HTMLElement, HTMLElement, HTMLElement, HTMLElement, HTMLElement], callbackfn: (this: undefined, value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [HTMLElement, HTMLElement, HTMLElement, HTMLElement, HTMLElement], callbackfn: (this: Z, value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [HTMLElement, HTMLElement, HTMLElement, HTMLElement], callbackfn: (this: undefined, value: HTMLElement, index: number, array: HTMLElement[]) => U): [U, U, U, U]; <U>(this: [HTMLElement, HTMLElement, HTMLElement, HTMLElement], callbackfn: (this: undefined, value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [HTMLElement, HTMLElement, HTMLElement, HTMLElement], callbackfn: (this: Z, value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [HTMLElement, HTMLElement, HTMLElement], callbackfn: (this: undefined, value: HTMLElement, index: number, array: HTMLElement[]) => U): [U, U, U]; <U>(this: [HTMLElement, HTMLElement, HTMLElement], callbackfn: (this: undefined, value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [HTMLElement, HTMLElement, HTMLElement], callbackfn: (this: Z, value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg: Z): [U, U, U]; <U>(this: [HTMLElement, HTMLElement], callbackfn: (this: undefined, value: HTMLElement, index: number, array: HTMLElement[]) => U): [U, U]; <U>(this: [HTMLElement, HTMLElement], callbackfn: (this: undefined, value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [HTMLElement, HTMLElement], callbackfn: (this: Z, value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: HTMLElement, index: number, array: HTMLElement[]) => U): U[]; <U>(callbackfn: (this: undefined, value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: HTMLElement, index: number, array: HTMLElement[]) => U, thisArg: Z): U[]; }
+>function (e) { // should not error    return e.clientWidth;} : (this: undefined, e: HTMLElement) => number
 >e : HTMLElement
 
     return e.clientWidth;
diff --git a/tests/baselines/reference/implementArrayInterface.errors.txt b/tests/baselines/reference/implementArrayInterface.errors.txt
index 08c438ebaf3..139bb42105d 100644
--- a/tests/baselines/reference/implementArrayInterface.errors.txt
+++ b/tests/baselines/reference/implementArrayInterface.errors.txt
@@ -1,6 +1,6 @@
 tests/cases/compiler/implementArrayInterface.ts(1,15): error TS2420: Class 'MyArray<T>' incorrectly implements interface 'T[]'.
   Types of property 'map' are incompatible.
-    Type '<U>(callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any) => U[]' is not assignable to type '{ <U>(this: [T, T, T, T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [T, T, T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [T, T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U, U]; <U>(this: [T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): U[]; }'.
+    Type '<U>(callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any) => U[]' is not assignable to type '{ <U>(this: [T, T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U, U, U, U]; <U>(this: [T, T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [T, T, T, T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U, U, U]; <U>(this: [T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [T, T, T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U, U]; <U>(this: [T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [T, T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U, U]; <U>(this: [T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U]; <U>(this: [T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): U[]; <U>(callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): U[]; }'.
       Type 'any[]' is not assignable to type '[any, any, any, any, any]'.
         Property '0' is missing in type 'any[]'.
 
@@ -10,7 +10,7 @@ tests/cases/compiler/implementArrayInterface.ts(1,15): error TS2420: Class 'MyAr
                   ~~~~~~~
 !!! error TS2420: Class 'MyArray<T>' incorrectly implements interface 'T[]'.
 !!! error TS2420:   Types of property 'map' are incompatible.
-!!! error TS2420:     Type '<U>(callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any) => U[]' is not assignable to type '{ <U>(this: [T, T, T, T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [T, T, T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [T, T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U, U]; <U>(this: [T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): U[]; }'.
+!!! error TS2420:     Type '<U>(callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any) => U[]' is not assignable to type '{ <U>(this: [T, T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U, U, U, U]; <U>(this: [T, T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [T, T, T, T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U, U, U]; <U>(this: [T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [T, T, T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U, U]; <U>(this: [T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [T, T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U, U]; <U>(this: [T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U]; <U>(this: [T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): U[]; <U>(callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): U[]; }'.
 !!! error TS2420:       Type 'any[]' is not assignable to type '[any, any, any, any, any]'.
 !!! error TS2420:         Property '0' is missing in type 'any[]'.
         toString(): string;
diff --git a/tests/baselines/reference/indexedAccessTypeConstraints.js b/tests/baselines/reference/indexedAccessTypeConstraints.js
new file mode 100644
index 00000000000..ec9af906e43
--- /dev/null
+++ b/tests/baselines/reference/indexedAccessTypeConstraints.js
@@ -0,0 +1,86 @@
+//// [indexedAccessTypeConstraints.ts]
+
+// Repro from #14557
+
+interface IData<T> {
+    content: T;
+}
+
+type Data<T> = {
+    get: <K extends keyof T>(prop: K) => T[K];
+};
+
+class Parent<M> {
+    private data: Data<M>;
+    getData(): Data<M> {
+        return this.data;
+    }
+}
+
+export class Foo<C> extends Parent<IData<C>> {
+    getContent(): C {
+        return this.getData().get('content');
+    }
+}
+
+export class Bar<C, T extends IData<C>> extends Parent<T> {
+    getContent(): C {
+        return this.getData().get('content');
+    }
+}
+
+// Repro from #14557
+
+function foo<C, T extends { content: C }>(x: C, y: T['content']) {
+    x = y;
+}
+
+
+//// [indexedAccessTypeConstraints.js]
+// Repro from #14557
+"use strict";
+var __extends = (this && this.__extends) || (function () {
+    var extendStatics = Object.setPrototypeOf ||
+        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
+        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
+    return function (d, b) {
+        extendStatics(d, b);
+        function __() { this.constructor = d; }
+        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
+    };
+})();
+exports.__esModule = true;
+var Parent = (function () {
+    function Parent() {
+    }
+    Parent.prototype.getData = function () {
+        return this.data;
+    };
+    return Parent;
+}());
+var Foo = (function (_super) {
+    __extends(Foo, _super);
+    function Foo() {
+        return _super !== null && _super.apply(this, arguments) || this;
+    }
+    Foo.prototype.getContent = function () {
+        return this.getData().get('content');
+    };
+    return Foo;
+}(Parent));
+exports.Foo = Foo;
+var Bar = (function (_super) {
+    __extends(Bar, _super);
+    function Bar() {
+        return _super !== null && _super.apply(this, arguments) || this;
+    }
+    Bar.prototype.getContent = function () {
+        return this.getData().get('content');
+    };
+    return Bar;
+}(Parent));
+exports.Bar = Bar;
+// Repro from #14557
+function foo(x, y) {
+    x = y;
+}
diff --git a/tests/baselines/reference/indexedAccessTypeConstraints.symbols b/tests/baselines/reference/indexedAccessTypeConstraints.symbols
new file mode 100644
index 00000000000..b2d10c7ee27
--- /dev/null
+++ b/tests/baselines/reference/indexedAccessTypeConstraints.symbols
@@ -0,0 +1,109 @@
+=== tests/cases/compiler/indexedAccessTypeConstraints.ts ===
+
+// Repro from #14557
+
+interface IData<T> {
+>IData : Symbol(IData, Decl(indexedAccessTypeConstraints.ts, 0, 0))
+>T : Symbol(T, Decl(indexedAccessTypeConstraints.ts, 3, 16))
+
+    content: T;
+>content : Symbol(IData.content, Decl(indexedAccessTypeConstraints.ts, 3, 20))
+>T : Symbol(T, Decl(indexedAccessTypeConstraints.ts, 3, 16))
+}
+
+type Data<T> = {
+>Data : Symbol(Data, Decl(indexedAccessTypeConstraints.ts, 5, 1))
+>T : Symbol(T, Decl(indexedAccessTypeConstraints.ts, 7, 10))
+
+    get: <K extends keyof T>(prop: K) => T[K];
+>get : Symbol(get, Decl(indexedAccessTypeConstraints.ts, 7, 16))
+>K : Symbol(K, Decl(indexedAccessTypeConstraints.ts, 8, 10))
+>T : Symbol(T, Decl(indexedAccessTypeConstraints.ts, 7, 10))
+>prop : Symbol(prop, Decl(indexedAccessTypeConstraints.ts, 8, 29))
+>K : Symbol(K, Decl(indexedAccessTypeConstraints.ts, 8, 10))
+>T : Symbol(T, Decl(indexedAccessTypeConstraints.ts, 7, 10))
+>K : Symbol(K, Decl(indexedAccessTypeConstraints.ts, 8, 10))
+
+};
+
+class Parent<M> {
+>Parent : Symbol(Parent, Decl(indexedAccessTypeConstraints.ts, 9, 2))
+>M : Symbol(M, Decl(indexedAccessTypeConstraints.ts, 11, 13))
+
+    private data: Data<M>;
+>data : Symbol(Parent.data, Decl(indexedAccessTypeConstraints.ts, 11, 17))
+>Data : Symbol(Data, Decl(indexedAccessTypeConstraints.ts, 5, 1))
+>M : Symbol(M, Decl(indexedAccessTypeConstraints.ts, 11, 13))
+
+    getData(): Data<M> {
+>getData : Symbol(Parent.getData, Decl(indexedAccessTypeConstraints.ts, 12, 26))
+>Data : Symbol(Data, Decl(indexedAccessTypeConstraints.ts, 5, 1))
+>M : Symbol(M, Decl(indexedAccessTypeConstraints.ts, 11, 13))
+
+        return this.data;
+>this.data : Symbol(Parent.data, Decl(indexedAccessTypeConstraints.ts, 11, 17))
+>this : Symbol(Parent, Decl(indexedAccessTypeConstraints.ts, 9, 2))
+>data : Symbol(Parent.data, Decl(indexedAccessTypeConstraints.ts, 11, 17))
+    }
+}
+
+export class Foo<C> extends Parent<IData<C>> {
+>Foo : Symbol(Foo, Decl(indexedAccessTypeConstraints.ts, 16, 1))
+>C : Symbol(C, Decl(indexedAccessTypeConstraints.ts, 18, 17))
+>Parent : Symbol(Parent, Decl(indexedAccessTypeConstraints.ts, 9, 2))
+>IData : Symbol(IData, Decl(indexedAccessTypeConstraints.ts, 0, 0))
+>C : Symbol(C, Decl(indexedAccessTypeConstraints.ts, 18, 17))
+
+    getContent(): C {
+>getContent : Symbol(Foo.getContent, Decl(indexedAccessTypeConstraints.ts, 18, 46))
+>C : Symbol(C, Decl(indexedAccessTypeConstraints.ts, 18, 17))
+
+        return this.getData().get('content');
+>this.getData().get : Symbol(get, Decl(indexedAccessTypeConstraints.ts, 7, 16))
+>this.getData : Symbol(Parent.getData, Decl(indexedAccessTypeConstraints.ts, 12, 26))
+>this : Symbol(Foo, Decl(indexedAccessTypeConstraints.ts, 16, 1))
+>getData : Symbol(Parent.getData, Decl(indexedAccessTypeConstraints.ts, 12, 26))
+>get : Symbol(get, Decl(indexedAccessTypeConstraints.ts, 7, 16))
+    }
+}
+
+export class Bar<C, T extends IData<C>> extends Parent<T> {
+>Bar : Symbol(Bar, Decl(indexedAccessTypeConstraints.ts, 22, 1))
+>C : Symbol(C, Decl(indexedAccessTypeConstraints.ts, 24, 17))
+>T : Symbol(T, Decl(indexedAccessTypeConstraints.ts, 24, 19))
+>IData : Symbol(IData, Decl(indexedAccessTypeConstraints.ts, 0, 0))
+>C : Symbol(C, Decl(indexedAccessTypeConstraints.ts, 24, 17))
+>Parent : Symbol(Parent, Decl(indexedAccessTypeConstraints.ts, 9, 2))
+>T : Symbol(T, Decl(indexedAccessTypeConstraints.ts, 24, 19))
+
+    getContent(): C {
+>getContent : Symbol(Bar.getContent, Decl(indexedAccessTypeConstraints.ts, 24, 59))
+>C : Symbol(C, Decl(indexedAccessTypeConstraints.ts, 24, 17))
+
+        return this.getData().get('content');
+>this.getData().get : Symbol(get, Decl(indexedAccessTypeConstraints.ts, 7, 16))
+>this.getData : Symbol(Parent.getData, Decl(indexedAccessTypeConstraints.ts, 12, 26))
+>this : Symbol(Bar, Decl(indexedAccessTypeConstraints.ts, 22, 1))
+>getData : Symbol(Parent.getData, Decl(indexedAccessTypeConstraints.ts, 12, 26))
+>get : Symbol(get, Decl(indexedAccessTypeConstraints.ts, 7, 16))
+    }
+}
+
+// Repro from #14557
+
+function foo<C, T extends { content: C }>(x: C, y: T['content']) {
+>foo : Symbol(foo, Decl(indexedAccessTypeConstraints.ts, 28, 1))
+>C : Symbol(C, Decl(indexedAccessTypeConstraints.ts, 32, 13))
+>T : Symbol(T, Decl(indexedAccessTypeConstraints.ts, 32, 15))
+>content : Symbol(content, Decl(indexedAccessTypeConstraints.ts, 32, 27))
+>C : Symbol(C, Decl(indexedAccessTypeConstraints.ts, 32, 13))
+>x : Symbol(x, Decl(indexedAccessTypeConstraints.ts, 32, 42))
+>C : Symbol(C, Decl(indexedAccessTypeConstraints.ts, 32, 13))
+>y : Symbol(y, Decl(indexedAccessTypeConstraints.ts, 32, 47))
+>T : Symbol(T, Decl(indexedAccessTypeConstraints.ts, 32, 15))
+
+    x = y;
+>x : Symbol(x, Decl(indexedAccessTypeConstraints.ts, 32, 42))
+>y : Symbol(y, Decl(indexedAccessTypeConstraints.ts, 32, 47))
+}
+
diff --git a/tests/baselines/reference/indexedAccessTypeConstraints.types b/tests/baselines/reference/indexedAccessTypeConstraints.types
new file mode 100644
index 00000000000..5a2cbc4933f
--- /dev/null
+++ b/tests/baselines/reference/indexedAccessTypeConstraints.types
@@ -0,0 +1,116 @@
+=== tests/cases/compiler/indexedAccessTypeConstraints.ts ===
+
+// Repro from #14557
+
+interface IData<T> {
+>IData : IData<T>
+>T : T
+
+    content: T;
+>content : T
+>T : T
+}
+
+type Data<T> = {
+>Data : { get: <K extends keyof T>(prop: K) => T[K]; }
+>T : T
+
+    get: <K extends keyof T>(prop: K) => T[K];
+>get : <K extends keyof T>(prop: K) => T[K]
+>K : K
+>T : T
+>prop : K
+>K : K
+>T : T
+>K : K
+
+};
+
+class Parent<M> {
+>Parent : Parent<M>
+>M : M
+
+    private data: Data<M>;
+>data : { get: <K extends keyof M>(prop: K) => M[K]; }
+>Data : { get: <K extends keyof T>(prop: K) => T[K]; }
+>M : M
+
+    getData(): Data<M> {
+>getData : () => { get: <K extends keyof M>(prop: K) => M[K]; }
+>Data : { get: <K extends keyof T>(prop: K) => T[K]; }
+>M : M
+
+        return this.data;
+>this.data : { get: <K extends keyof M>(prop: K) => M[K]; }
+>this : this
+>data : { get: <K extends keyof M>(prop: K) => M[K]; }
+    }
+}
+
+export class Foo<C> extends Parent<IData<C>> {
+>Foo : Foo<C>
+>C : C
+>Parent : Parent<IData<C>>
+>IData : IData<T>
+>C : C
+
+    getContent(): C {
+>getContent : () => C
+>C : C
+
+        return this.getData().get('content');
+>this.getData().get('content') : C
+>this.getData().get : <K extends "content">(prop: K) => IData<C>[K]
+>this.getData() : { get: <K extends "content">(prop: K) => IData<C>[K]; }
+>this.getData : () => { get: <K extends "content">(prop: K) => IData<C>[K]; }
+>this : this
+>getData : () => { get: <K extends "content">(prop: K) => IData<C>[K]; }
+>get : <K extends "content">(prop: K) => IData<C>[K]
+>'content' : "content"
+    }
+}
+
+export class Bar<C, T extends IData<C>> extends Parent<T> {
+>Bar : Bar<C, T>
+>C : C
+>T : T
+>IData : IData<T>
+>C : C
+>Parent : Parent<T>
+>T : T
+
+    getContent(): C {
+>getContent : () => C
+>C : C
+
+        return this.getData().get('content');
+>this.getData().get('content') : T["content"]
+>this.getData().get : <K extends keyof T>(prop: K) => T[K]
+>this.getData() : { get: <K extends keyof T>(prop: K) => T[K]; }
+>this.getData : () => { get: <K extends keyof T>(prop: K) => T[K]; }
+>this : this
+>getData : () => { get: <K extends keyof T>(prop: K) => T[K]; }
+>get : <K extends keyof T>(prop: K) => T[K]
+>'content' : "content"
+    }
+}
+
+// Repro from #14557
+
+function foo<C, T extends { content: C }>(x: C, y: T['content']) {
+>foo : <C, T extends { content: C; }>(x: C, y: T["content"]) => void
+>C : C
+>T : T
+>content : C
+>C : C
+>x : C
+>C : C
+>y : T["content"]
+>T : T
+
+    x = y;
+>x = y : T["content"]
+>x : C
+>y : T["content"]
+}
+
diff --git a/tests/baselines/reference/inferenceLimit.symbols b/tests/baselines/reference/inferenceLimit.symbols
index 488838548ad..e471856e448 100644
--- a/tests/baselines/reference/inferenceLimit.symbols
+++ b/tests/baselines/reference/inferenceLimit.symbols
@@ -64,9 +64,9 @@ export class BrokenClass {
 >Promise.all : Symbol(PromiseConstructor.all, Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Promise : Symbol(Promise, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >all : Symbol(PromiseConstructor.all, Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.promise.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->result.map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>result.map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
 >result : Symbol(result, Decl(file1.ts, 10, 7))
->map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
 >populateItems : Symbol(populateItems, Decl(file1.ts, 12, 7))
 
       .then((orders: Array<MyModule.MyModel>) => {
diff --git a/tests/baselines/reference/inferenceLimit.types b/tests/baselines/reference/inferenceLimit.types
index bf917e18e93..9f2f11d988f 100644
--- a/tests/baselines/reference/inferenceLimit.types
+++ b/tests/baselines/reference/inferenceLimit.types
@@ -84,9 +84,9 @@ export class BrokenClass {
 >Promise : PromiseConstructor
 >all : { <T1, T2, T3, T4, T5, T6, T7, T8, T9, T10>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>, T5 | PromiseLike<T5>, T6 | PromiseLike<T6>, T7 | PromiseLike<T7>, T8 | PromiseLike<T8>, T9 | PromiseLike<T9>, T10 | PromiseLike<T10>]): Promise<[T1, T2, T3, T4, T5, T6, T7, T8, T9, T10]>; <T1, T2, T3, T4, T5, T6, T7, T8, T9>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>, T5 | PromiseLike<T5>, T6 | PromiseLike<T6>, T7 | PromiseLike<T7>, T8 | PromiseLike<T8>, T9 | PromiseLike<T9>]): Promise<[T1, T2, T3, T4, T5, T6, T7, T8, T9]>; <T1, T2, T3, T4, T5, T6, T7, T8>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>, T5 | PromiseLike<T5>, T6 | PromiseLike<T6>, T7 | PromiseLike<T7>, T8 | PromiseLike<T8>]): Promise<[T1, T2, T3, T4, T5, T6, T7, T8]>; <T1, T2, T3, T4, T5, T6, T7>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>, T5 | PromiseLike<T5>, T6 | PromiseLike<T6>, T7 | PromiseLike<T7>]): Promise<[T1, T2, T3, T4, T5, T6, T7]>; <T1, T2, T3, T4, T5, T6>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>, T5 | PromiseLike<T5>, T6 | PromiseLike<T6>]): Promise<[T1, T2, T3, T4, T5, T6]>; <T1, T2, T3, T4, T5>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>, T5 | PromiseLike<T5>]): Promise<[T1, T2, T3, T4, T5]>; <T1, T2, T3, T4>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>, T4 | PromiseLike<T4>]): Promise<[T1, T2, T3, T4]>; <T1, T2, T3>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>, T3 | PromiseLike<T3>]): Promise<[T1, T2, T3]>; <T1, T2>(values: [T1 | PromiseLike<T1>, T2 | PromiseLike<T2>]): Promise<[T1, T2]>; <T>(values: (T | PromiseLike<T>)[]): Promise<T[]>; <TAll>(values: Iterable<TAll | PromiseLike<TAll>>): Promise<TAll[]>; }
 >result.map(populateItems) : Promise<{}>[]
->result.map : { <U>(this: [MyModule.MyModel, MyModule.MyModel, MyModule.MyModel, MyModule.MyModel, MyModule.MyModel], callbackfn: (value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [MyModule.MyModel, MyModule.MyModel, MyModule.MyModel, MyModule.MyModel], callbackfn: (value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [MyModule.MyModel, MyModule.MyModel, MyModule.MyModel], callbackfn: (value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg?: any): [U, U, U]; <U>(this: [MyModule.MyModel, MyModule.MyModel], callbackfn: (value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg?: any): U[]; }
+>result.map : { <U>(this: [MyModule.MyModel, MyModule.MyModel, MyModule.MyModel, MyModule.MyModel, MyModule.MyModel], callbackfn: (this: undefined, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U): [U, U, U, U, U]; <U>(this: [MyModule.MyModel, MyModule.MyModel, MyModule.MyModel, MyModule.MyModel, MyModule.MyModel], callbackfn: (this: undefined, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [MyModule.MyModel, MyModule.MyModel, MyModule.MyModel, MyModule.MyModel, MyModule.MyModel], callbackfn: (this: Z, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [MyModule.MyModel, MyModule.MyModel, MyModule.MyModel, MyModule.MyModel], callbackfn: (this: undefined, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U): [U, U, U, U]; <U>(this: [MyModule.MyModel, MyModule.MyModel, MyModule.MyModel, MyModule.MyModel], callbackfn: (this: undefined, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [MyModule.MyModel, MyModule.MyModel, MyModule.MyModel, MyModule.MyModel], callbackfn: (this: Z, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [MyModule.MyModel, MyModule.MyModel, MyModule.MyModel], callbackfn: (this: undefined, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U): [U, U, U]; <U>(this: [MyModule.MyModel, MyModule.MyModel, MyModule.MyModel], callbackfn: (this: undefined, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [MyModule.MyModel, MyModule.MyModel, MyModule.MyModel], callbackfn: (this: Z, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg: Z): [U, U, U]; <U>(this: [MyModule.MyModel, MyModule.MyModel], callbackfn: (this: undefined, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U): [U, U]; <U>(this: [MyModule.MyModel, MyModule.MyModel], callbackfn: (this: undefined, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [MyModule.MyModel, MyModule.MyModel], callbackfn: (this: Z, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U): U[]; <U>(callbackfn: (this: undefined, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg: Z): U[]; }
 >result : MyModule.MyModel[]
->map : { <U>(this: [MyModule.MyModel, MyModule.MyModel, MyModule.MyModel, MyModule.MyModel, MyModule.MyModel], callbackfn: (value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [MyModule.MyModel, MyModule.MyModel, MyModule.MyModel, MyModule.MyModel], callbackfn: (value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [MyModule.MyModel, MyModule.MyModel, MyModule.MyModel], callbackfn: (value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg?: any): [U, U, U]; <U>(this: [MyModule.MyModel, MyModule.MyModel], callbackfn: (value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg?: any): U[]; }
+>map : { <U>(this: [MyModule.MyModel, MyModule.MyModel, MyModule.MyModel, MyModule.MyModel, MyModule.MyModel], callbackfn: (this: undefined, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U): [U, U, U, U, U]; <U>(this: [MyModule.MyModel, MyModule.MyModel, MyModule.MyModel, MyModule.MyModel, MyModule.MyModel], callbackfn: (this: undefined, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [MyModule.MyModel, MyModule.MyModel, MyModule.MyModel, MyModule.MyModel, MyModule.MyModel], callbackfn: (this: Z, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [MyModule.MyModel, MyModule.MyModel, MyModule.MyModel, MyModule.MyModel], callbackfn: (this: undefined, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U): [U, U, U, U]; <U>(this: [MyModule.MyModel, MyModule.MyModel, MyModule.MyModel, MyModule.MyModel], callbackfn: (this: undefined, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [MyModule.MyModel, MyModule.MyModel, MyModule.MyModel, MyModule.MyModel], callbackfn: (this: Z, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [MyModule.MyModel, MyModule.MyModel, MyModule.MyModel], callbackfn: (this: undefined, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U): [U, U, U]; <U>(this: [MyModule.MyModel, MyModule.MyModel, MyModule.MyModel], callbackfn: (this: undefined, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [MyModule.MyModel, MyModule.MyModel, MyModule.MyModel], callbackfn: (this: Z, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg: Z): [U, U, U]; <U>(this: [MyModule.MyModel, MyModule.MyModel], callbackfn: (this: undefined, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U): [U, U]; <U>(this: [MyModule.MyModel, MyModule.MyModel], callbackfn: (this: undefined, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [MyModule.MyModel, MyModule.MyModel], callbackfn: (this: Z, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U): U[]; <U>(callbackfn: (this: undefined, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: MyModule.MyModel, index: number, array: MyModule.MyModel[]) => U, thisArg: Z): U[]; }
 >populateItems : (order: any) => Promise<{}>
 
       .then((orders: Array<MyModule.MyModel>) => {
diff --git a/tests/baselines/reference/inferentialTypingWithFunctionType2.symbols b/tests/baselines/reference/inferentialTypingWithFunctionType2.symbols
index 56d2c2dc87f..fe60a8c1581 100644
--- a/tests/baselines/reference/inferentialTypingWithFunctionType2.symbols
+++ b/tests/baselines/reference/inferentialTypingWithFunctionType2.symbols
@@ -11,7 +11,7 @@ function identity<A>(a: A): A {
 }
 var x = [1, 2, 3].map(identity)[0];
 >x : Symbol(x, Decl(inferentialTypingWithFunctionType2.ts, 3, 3))
->[1, 2, 3].map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>[1, 2, 3].map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >identity : Symbol(identity, Decl(inferentialTypingWithFunctionType2.ts, 0, 0))
 
diff --git a/tests/baselines/reference/inferentialTypingWithFunctionType2.types b/tests/baselines/reference/inferentialTypingWithFunctionType2.types
index b9208409fe0..55caace2c2c 100644
--- a/tests/baselines/reference/inferentialTypingWithFunctionType2.types
+++ b/tests/baselines/reference/inferentialTypingWithFunctionType2.types
@@ -13,12 +13,12 @@ var x = [1, 2, 3].map(identity)[0];
 >x : number
 >[1, 2, 3].map(identity)[0] : number
 >[1, 2, 3].map(identity) : number[]
->[1, 2, 3].map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
+>[1, 2, 3].map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
 >[1, 2, 3] : number[]
 >1 : 1
 >2 : 2
 >3 : 3
->map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
+>map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
 >identity : <A>(a: A) => A
 >0 : 0
 
diff --git a/tests/baselines/reference/inferringClassMembersFromAssignments.js b/tests/baselines/reference/inferringClassMembersFromAssignments.js
index a7b9e4ff8f0..74c47dab565 100644
--- a/tests/baselines/reference/inferringClassMembersFromAssignments.js
+++ b/tests/baselines/reference/inferringClassMembersFromAssignments.js
@@ -20,6 +20,15 @@ class C {
             this.inMethod = "string"
         }
         this.inMultiple = "string";
+
+        var action = () => {
+            if (Math.random()) {
+                this.inNestedArrowFunction = 0;
+            }
+            else {
+                this.inNestedArrowFunction = "string"
+            }
+        };
     }
     get() {
         if (Math.random()) {
@@ -38,6 +47,14 @@ class C {
             this.inSetter = "string"
         }
     }
+    prop = () => {
+        if (Math.random()) {
+            this.inPropertyDeclaration = 0;
+        }
+        else {
+            this.inPropertyDeclaration = "string"
+        }
+    }
     static method() {
         if (Math.random()) {
             this.inStaticMethod = 0;
@@ -45,6 +62,15 @@ class C {
         else {
             this.inStaticMethod = "string"
         }
+
+        var action = () => {
+            if (Math.random()) {
+                this.inStaticNestedArrowFunction = 0;
+            }
+            else {
+                this.inStaticNestedArrowFunction = "string"
+            }
+        };
     }
     static get() {
         if (Math.random()) {
@@ -62,6 +88,14 @@ class C {
             this.inStaticSetter = "string"
         }
     }
+    static prop = () => {
+        if (Math.random()) {
+            this.inStaticPropertyDeclaration = 0;
+        }
+        else {
+            this.inStaticPropertyDeclaration = "string"
+        }
+    }
 }
 
 //// [b.ts]
@@ -75,6 +109,8 @@ var stringOrNumberOrUndefined: string | number | undefined;
 var stringOrNumberOrUndefined = c.inMethod;
 var stringOrNumberOrUndefined = c.inGetter;
 var stringOrNumberOrUndefined = c.inSetter;
+var stringOrNumberOrUndefined = c.inPropertyDeclaration;
+var stringOrNumberOrUndefined = c.inNestedArrowFunction
 
 var stringOrNumberOrBoolean: string | number | boolean;
 
@@ -84,11 +120,23 @@ var stringOrNumberOrBoolean = c.inMultiple;
 var stringOrNumberOrUndefined = C.inStaticMethod;
 var stringOrNumberOrUndefined = C.inStaticGetter;
 var stringOrNumberOrUndefined = C.inStaticSetter;
+var stringOrNumberOrUndefined = C.inStaticPropertyDeclaration;
+var stringOrNumberOrUndefined = C.inStaticNestedArrowFunction;
 
 
 //// [output.js]
+var _this = this;
 var C = (function () {
     function C() {
+        var _this = this;
+        this.prop = function () {
+            if (Math.random()) {
+                _this.inPropertyDeclaration = 0;
+            }
+            else {
+                _this.inPropertyDeclaration = "string";
+            }
+        };
         if (Math.random()) {
             this.inConstructor = 0;
         }
@@ -98,6 +146,7 @@ var C = (function () {
         this.inMultiple = 0;
     }
     C.prototype.method = function () {
+        var _this = this;
         if (Math.random()) {
             this.inMethod = 0;
         }
@@ -105,6 +154,14 @@ var C = (function () {
             this.inMethod = "string";
         }
         this.inMultiple = "string";
+        var action = function () {
+            if (Math.random()) {
+                _this.inNestedArrowFunction = 0;
+            }
+            else {
+                _this.inNestedArrowFunction = "string";
+            }
+        };
     };
     C.prototype.get = function () {
         if (Math.random()) {
@@ -124,12 +181,21 @@ var C = (function () {
         }
     };
     C.method = function () {
+        var _this = this;
         if (Math.random()) {
             this.inStaticMethod = 0;
         }
         else {
             this.inStaticMethod = "string";
         }
+        var action = function () {
+            if (Math.random()) {
+                _this.inStaticNestedArrowFunction = 0;
+            }
+            else {
+                _this.inStaticNestedArrowFunction = "string";
+            }
+        };
     };
     C.get = function () {
         if (Math.random()) {
@@ -149,6 +215,14 @@ var C = (function () {
     };
     return C;
 }());
+C.prop = function () {
+    if (Math.random()) {
+        _this.inStaticPropertyDeclaration = 0;
+    }
+    else {
+        _this.inStaticPropertyDeclaration = "string";
+    }
+};
 var c = new C();
 var stringOrNumber;
 var stringOrNumber = c.inConstructor;
@@ -156,8 +230,12 @@ var stringOrNumberOrUndefined;
 var stringOrNumberOrUndefined = c.inMethod;
 var stringOrNumberOrUndefined = c.inGetter;
 var stringOrNumberOrUndefined = c.inSetter;
+var stringOrNumberOrUndefined = c.inPropertyDeclaration;
+var stringOrNumberOrUndefined = c.inNestedArrowFunction;
 var stringOrNumberOrBoolean;
 var stringOrNumberOrBoolean = c.inMultiple;
 var stringOrNumberOrUndefined = C.inStaticMethod;
 var stringOrNumberOrUndefined = C.inStaticGetter;
 var stringOrNumberOrUndefined = C.inStaticSetter;
+var stringOrNumberOrUndefined = C.inStaticPropertyDeclaration;
+var stringOrNumberOrUndefined = C.inStaticNestedArrowFunction;
diff --git a/tests/baselines/reference/inferringClassMembersFromAssignments.symbols b/tests/baselines/reference/inferringClassMembersFromAssignments.symbols
index 9951339f8a8..086c4246697 100644
--- a/tests/baselines/reference/inferringClassMembersFromAssignments.symbols
+++ b/tests/baselines/reference/inferringClassMembersFromAssignments.symbols
@@ -21,9 +21,9 @@ class C {
 >inConstructor : Symbol(C.inConstructor, Decl(a.js, 3, 28), Decl(a.js, 6, 14))
         }
         this.inMultiple = 0;
->this.inMultiple : Symbol(C.inMultiple, Decl(a.js, 8, 9), Decl(a.js, 17, 9), Decl(a.js, 26, 9))
+>this.inMultiple : Symbol(C.inMultiple, Decl(a.js, 8, 9), Decl(a.js, 17, 9), Decl(a.js, 35, 9))
 >this : Symbol(C, Decl(a.js, 0, 0))
->inMultiple : Symbol(C.inMultiple, Decl(a.js, 8, 9), Decl(a.js, 17, 9), Decl(a.js, 26, 9))
+>inMultiple : Symbol(C.inMultiple, Decl(a.js, 8, 9), Decl(a.js, 17, 9), Decl(a.js, 35, 9))
     }
     method() {
 >method : Symbol(C.method, Decl(a.js, 10, 5))
@@ -45,12 +45,33 @@ class C {
 >inMethod : Symbol(C.inMethod, Decl(a.js, 12, 28), Decl(a.js, 15, 14))
         }
         this.inMultiple = "string";
->this.inMultiple : Symbol(C.inMultiple, Decl(a.js, 8, 9), Decl(a.js, 17, 9), Decl(a.js, 26, 9))
+>this.inMultiple : Symbol(C.inMultiple, Decl(a.js, 8, 9), Decl(a.js, 17, 9), Decl(a.js, 35, 9))
 >this : Symbol(C, Decl(a.js, 0, 0))
->inMultiple : Symbol(C.inMultiple, Decl(a.js, 8, 9), Decl(a.js, 17, 9), Decl(a.js, 26, 9))
+>inMultiple : Symbol(C.inMultiple, Decl(a.js, 8, 9), Decl(a.js, 17, 9), Decl(a.js, 35, 9))
+
+        var action = () => {
+>action : Symbol(action, Decl(a.js, 20, 11))
+
+            if (Math.random()) {
+>Math.random : Symbol(Math.random, Decl(lib.d.ts, --, --))
+>Math : Symbol(Math, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>random : Symbol(Math.random, Decl(lib.d.ts, --, --))
+
+                this.inNestedArrowFunction = 0;
+>this.inNestedArrowFunction : Symbol(C.inNestedArrowFunction, Decl(a.js, 21, 32), Decl(a.js, 24, 18))
+>this : Symbol(C, Decl(a.js, 0, 0))
+>inNestedArrowFunction : Symbol(C.inNestedArrowFunction, Decl(a.js, 21, 32), Decl(a.js, 24, 18))
+            }
+            else {
+                this.inNestedArrowFunction = "string"
+>this.inNestedArrowFunction : Symbol(C.inNestedArrowFunction, Decl(a.js, 21, 32), Decl(a.js, 24, 18))
+>this : Symbol(C, Decl(a.js, 0, 0))
+>inNestedArrowFunction : Symbol(C.inNestedArrowFunction, Decl(a.js, 21, 32), Decl(a.js, 24, 18))
+            }
+        };
     }
     get() {
->get : Symbol(C.get, Decl(a.js, 19, 5))
+>get : Symbol(C.get, Decl(a.js, 28, 5))
 
         if (Math.random()) {
 >Math.random : Symbol(Math.random, Decl(lib.d.ts, --, --))
@@ -58,23 +79,23 @@ class C {
 >random : Symbol(Math.random, Decl(lib.d.ts, --, --))
 
             this.inGetter = 0;
->this.inGetter : Symbol(C.inGetter, Decl(a.js, 21, 28), Decl(a.js, 24, 14))
+>this.inGetter : Symbol(C.inGetter, Decl(a.js, 30, 28), Decl(a.js, 33, 14))
 >this : Symbol(C, Decl(a.js, 0, 0))
->inGetter : Symbol(C.inGetter, Decl(a.js, 21, 28), Decl(a.js, 24, 14))
+>inGetter : Symbol(C.inGetter, Decl(a.js, 30, 28), Decl(a.js, 33, 14))
         }
         else {
             this.inGetter = "string"
->this.inGetter : Symbol(C.inGetter, Decl(a.js, 21, 28), Decl(a.js, 24, 14))
+>this.inGetter : Symbol(C.inGetter, Decl(a.js, 30, 28), Decl(a.js, 33, 14))
 >this : Symbol(C, Decl(a.js, 0, 0))
->inGetter : Symbol(C.inGetter, Decl(a.js, 21, 28), Decl(a.js, 24, 14))
+>inGetter : Symbol(C.inGetter, Decl(a.js, 30, 28), Decl(a.js, 33, 14))
         }
         this.inMultiple = false;
->this.inMultiple : Symbol(C.inMultiple, Decl(a.js, 8, 9), Decl(a.js, 17, 9), Decl(a.js, 26, 9))
+>this.inMultiple : Symbol(C.inMultiple, Decl(a.js, 8, 9), Decl(a.js, 17, 9), Decl(a.js, 35, 9))
 >this : Symbol(C, Decl(a.js, 0, 0))
->inMultiple : Symbol(C.inMultiple, Decl(a.js, 8, 9), Decl(a.js, 17, 9), Decl(a.js, 26, 9))
+>inMultiple : Symbol(C.inMultiple, Decl(a.js, 8, 9), Decl(a.js, 17, 9), Decl(a.js, 35, 9))
     }
     set() {
->set : Symbol(C.set, Decl(a.js, 28, 5))
+>set : Symbol(C.set, Decl(a.js, 37, 5))
 
         if (Math.random()) {
 >Math.random : Symbol(Math.random, Decl(lib.d.ts, --, --))
@@ -82,19 +103,39 @@ class C {
 >random : Symbol(Math.random, Decl(lib.d.ts, --, --))
 
             this.inSetter = 0;
->this.inSetter : Symbol(C.inSetter, Decl(a.js, 30, 28), Decl(a.js, 33, 14))
+>this.inSetter : Symbol(C.inSetter, Decl(a.js, 39, 28), Decl(a.js, 42, 14))
 >this : Symbol(C, Decl(a.js, 0, 0))
->inSetter : Symbol(C.inSetter, Decl(a.js, 30, 28), Decl(a.js, 33, 14))
+>inSetter : Symbol(C.inSetter, Decl(a.js, 39, 28), Decl(a.js, 42, 14))
         }
         else {
             this.inSetter = "string"
->this.inSetter : Symbol(C.inSetter, Decl(a.js, 30, 28), Decl(a.js, 33, 14))
+>this.inSetter : Symbol(C.inSetter, Decl(a.js, 39, 28), Decl(a.js, 42, 14))
 >this : Symbol(C, Decl(a.js, 0, 0))
->inSetter : Symbol(C.inSetter, Decl(a.js, 30, 28), Decl(a.js, 33, 14))
+>inSetter : Symbol(C.inSetter, Decl(a.js, 39, 28), Decl(a.js, 42, 14))
+        }
+    }
+    prop = () => {
+>prop : Symbol(C.prop, Decl(a.js, 45, 5))
+
+        if (Math.random()) {
+>Math.random : Symbol(Math.random, Decl(lib.d.ts, --, --))
+>Math : Symbol(Math, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>random : Symbol(Math.random, Decl(lib.d.ts, --, --))
+
+            this.inPropertyDeclaration = 0;
+>this.inPropertyDeclaration : Symbol(C.inPropertyDeclaration, Decl(a.js, 47, 28), Decl(a.js, 50, 14))
+>this : Symbol(C, Decl(a.js, 0, 0))
+>inPropertyDeclaration : Symbol(C.inPropertyDeclaration, Decl(a.js, 47, 28), Decl(a.js, 50, 14))
+        }
+        else {
+            this.inPropertyDeclaration = "string"
+>this.inPropertyDeclaration : Symbol(C.inPropertyDeclaration, Decl(a.js, 47, 28), Decl(a.js, 50, 14))
+>this : Symbol(C, Decl(a.js, 0, 0))
+>inPropertyDeclaration : Symbol(C.inPropertyDeclaration, Decl(a.js, 47, 28), Decl(a.js, 50, 14))
         }
     }
     static method() {
->method : Symbol(C.method, Decl(a.js, 36, 5))
+>method : Symbol(C.method, Decl(a.js, 53, 5))
 
         if (Math.random()) {
 >Math.random : Symbol(Math.random, Decl(lib.d.ts, --, --))
@@ -102,19 +143,40 @@ class C {
 >random : Symbol(Math.random, Decl(lib.d.ts, --, --))
 
             this.inStaticMethod = 0;
->this.inStaticMethod : Symbol(C.inStaticMethod, Decl(a.js, 38, 28), Decl(a.js, 41, 14))
+>this.inStaticMethod : Symbol(C.inStaticMethod, Decl(a.js, 55, 28), Decl(a.js, 58, 14))
 >this : Symbol(C, Decl(a.js, 0, 0))
->inStaticMethod : Symbol(C.inStaticMethod, Decl(a.js, 38, 28), Decl(a.js, 41, 14))
+>inStaticMethod : Symbol(C.inStaticMethod, Decl(a.js, 55, 28), Decl(a.js, 58, 14))
         }
         else {
             this.inStaticMethod = "string"
->this.inStaticMethod : Symbol(C.inStaticMethod, Decl(a.js, 38, 28), Decl(a.js, 41, 14))
+>this.inStaticMethod : Symbol(C.inStaticMethod, Decl(a.js, 55, 28), Decl(a.js, 58, 14))
 >this : Symbol(C, Decl(a.js, 0, 0))
->inStaticMethod : Symbol(C.inStaticMethod, Decl(a.js, 38, 28), Decl(a.js, 41, 14))
+>inStaticMethod : Symbol(C.inStaticMethod, Decl(a.js, 55, 28), Decl(a.js, 58, 14))
         }
+
+        var action = () => {
+>action : Symbol(action, Decl(a.js, 62, 11))
+
+            if (Math.random()) {
+>Math.random : Symbol(Math.random, Decl(lib.d.ts, --, --))
+>Math : Symbol(Math, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>random : Symbol(Math.random, Decl(lib.d.ts, --, --))
+
+                this.inStaticNestedArrowFunction = 0;
+>this.inStaticNestedArrowFunction : Symbol(C.inStaticNestedArrowFunction, Decl(a.js, 63, 32), Decl(a.js, 66, 18))
+>this : Symbol(C, Decl(a.js, 0, 0))
+>inStaticNestedArrowFunction : Symbol(C.inStaticNestedArrowFunction, Decl(a.js, 63, 32), Decl(a.js, 66, 18))
+            }
+            else {
+                this.inStaticNestedArrowFunction = "string"
+>this.inStaticNestedArrowFunction : Symbol(C.inStaticNestedArrowFunction, Decl(a.js, 63, 32), Decl(a.js, 66, 18))
+>this : Symbol(C, Decl(a.js, 0, 0))
+>inStaticNestedArrowFunction : Symbol(C.inStaticNestedArrowFunction, Decl(a.js, 63, 32), Decl(a.js, 66, 18))
+            }
+        };
     }
     static get() {
->get : Symbol(C.get, Decl(a.js, 44, 5))
+>get : Symbol(C.get, Decl(a.js, 70, 5))
 
         if (Math.random()) {
 >Math.random : Symbol(Math.random, Decl(lib.d.ts, --, --))
@@ -122,19 +184,19 @@ class C {
 >random : Symbol(Math.random, Decl(lib.d.ts, --, --))
 
             this.inStaticGetter = 0;
->this.inStaticGetter : Symbol(C.inStaticGetter, Decl(a.js, 46, 28), Decl(a.js, 49, 14))
+>this.inStaticGetter : Symbol(C.inStaticGetter, Decl(a.js, 72, 28), Decl(a.js, 75, 14))
 >this : Symbol(C, Decl(a.js, 0, 0))
->inStaticGetter : Symbol(C.inStaticGetter, Decl(a.js, 46, 28), Decl(a.js, 49, 14))
+>inStaticGetter : Symbol(C.inStaticGetter, Decl(a.js, 72, 28), Decl(a.js, 75, 14))
         }
         else {
             this.inStaticGetter = "string"
->this.inStaticGetter : Symbol(C.inStaticGetter, Decl(a.js, 46, 28), Decl(a.js, 49, 14))
+>this.inStaticGetter : Symbol(C.inStaticGetter, Decl(a.js, 72, 28), Decl(a.js, 75, 14))
 >this : Symbol(C, Decl(a.js, 0, 0))
->inStaticGetter : Symbol(C.inStaticGetter, Decl(a.js, 46, 28), Decl(a.js, 49, 14))
+>inStaticGetter : Symbol(C.inStaticGetter, Decl(a.js, 72, 28), Decl(a.js, 75, 14))
         }
     }
     static set() {
->set : Symbol(C.set, Decl(a.js, 52, 5))
+>set : Symbol(C.set, Decl(a.js, 78, 5))
 
         if (Math.random()) {
 >Math.random : Symbol(Math.random, Decl(lib.d.ts, --, --))
@@ -142,15 +204,35 @@ class C {
 >random : Symbol(Math.random, Decl(lib.d.ts, --, --))
 
             this.inStaticSetter = 0;
->this.inStaticSetter : Symbol(C.inStaticSetter, Decl(a.js, 54, 28), Decl(a.js, 57, 14))
+>this.inStaticSetter : Symbol(C.inStaticSetter, Decl(a.js, 80, 28), Decl(a.js, 83, 14))
 >this : Symbol(C, Decl(a.js, 0, 0))
->inStaticSetter : Symbol(C.inStaticSetter, Decl(a.js, 54, 28), Decl(a.js, 57, 14))
+>inStaticSetter : Symbol(C.inStaticSetter, Decl(a.js, 80, 28), Decl(a.js, 83, 14))
         }
         else {
             this.inStaticSetter = "string"
->this.inStaticSetter : Symbol(C.inStaticSetter, Decl(a.js, 54, 28), Decl(a.js, 57, 14))
+>this.inStaticSetter : Symbol(C.inStaticSetter, Decl(a.js, 80, 28), Decl(a.js, 83, 14))
 >this : Symbol(C, Decl(a.js, 0, 0))
->inStaticSetter : Symbol(C.inStaticSetter, Decl(a.js, 54, 28), Decl(a.js, 57, 14))
+>inStaticSetter : Symbol(C.inStaticSetter, Decl(a.js, 80, 28), Decl(a.js, 83, 14))
+        }
+    }
+    static prop = () => {
+>prop : Symbol(C.prop, Decl(a.js, 86, 5))
+
+        if (Math.random()) {
+>Math.random : Symbol(Math.random, Decl(lib.d.ts, --, --))
+>Math : Symbol(Math, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>random : Symbol(Math.random, Decl(lib.d.ts, --, --))
+
+            this.inStaticPropertyDeclaration = 0;
+>this.inStaticPropertyDeclaration : Symbol(C.inStaticPropertyDeclaration, Decl(a.js, 88, 28), Decl(a.js, 91, 14))
+>this : Symbol(C, Decl(a.js, 0, 0))
+>inStaticPropertyDeclaration : Symbol(C.inStaticPropertyDeclaration, Decl(a.js, 88, 28), Decl(a.js, 91, 14))
+        }
+        else {
+            this.inStaticPropertyDeclaration = "string"
+>this.inStaticPropertyDeclaration : Symbol(C.inStaticPropertyDeclaration, Decl(a.js, 88, 28), Decl(a.js, 91, 14))
+>this : Symbol(C, Decl(a.js, 0, 0))
+>inStaticPropertyDeclaration : Symbol(C.inStaticPropertyDeclaration, Decl(a.js, 88, 28), Decl(a.js, 91, 14))
         }
     }
 }
@@ -170,51 +252,75 @@ var stringOrNumber = c.inConstructor;
 >inConstructor : Symbol(C.inConstructor, Decl(a.js, 3, 28), Decl(a.js, 6, 14))
 
 var stringOrNumberOrUndefined: string | number | undefined;
->stringOrNumberOrUndefined : Symbol(stringOrNumberOrUndefined, Decl(b.ts, 5, 3), Decl(b.ts, 7, 3), Decl(b.ts, 8, 3), Decl(b.ts, 9, 3), Decl(b.ts, 16, 3), Decl(b.ts, 17, 3), Decl(b.ts, 18, 3))
+>stringOrNumberOrUndefined : Symbol(stringOrNumberOrUndefined, Decl(b.ts, 5, 3), Decl(b.ts, 7, 3), Decl(b.ts, 8, 3), Decl(b.ts, 9, 3), Decl(b.ts, 10, 3), Decl(b.ts, 11, 3), Decl(b.ts, 18, 3), Decl(b.ts, 19, 3), Decl(b.ts, 20, 3), Decl(b.ts, 21, 3), Decl(b.ts, 22, 3))
 
 var stringOrNumberOrUndefined = c.inMethod;
->stringOrNumberOrUndefined : Symbol(stringOrNumberOrUndefined, Decl(b.ts, 5, 3), Decl(b.ts, 7, 3), Decl(b.ts, 8, 3), Decl(b.ts, 9, 3), Decl(b.ts, 16, 3), Decl(b.ts, 17, 3), Decl(b.ts, 18, 3))
+>stringOrNumberOrUndefined : Symbol(stringOrNumberOrUndefined, Decl(b.ts, 5, 3), Decl(b.ts, 7, 3), Decl(b.ts, 8, 3), Decl(b.ts, 9, 3), Decl(b.ts, 10, 3), Decl(b.ts, 11, 3), Decl(b.ts, 18, 3), Decl(b.ts, 19, 3), Decl(b.ts, 20, 3), Decl(b.ts, 21, 3), Decl(b.ts, 22, 3))
 >c.inMethod : Symbol(C.inMethod, Decl(a.js, 12, 28), Decl(a.js, 15, 14))
 >c : Symbol(c, Decl(b.ts, 0, 3))
 >inMethod : Symbol(C.inMethod, Decl(a.js, 12, 28), Decl(a.js, 15, 14))
 
 var stringOrNumberOrUndefined = c.inGetter;
->stringOrNumberOrUndefined : Symbol(stringOrNumberOrUndefined, Decl(b.ts, 5, 3), Decl(b.ts, 7, 3), Decl(b.ts, 8, 3), Decl(b.ts, 9, 3), Decl(b.ts, 16, 3), Decl(b.ts, 17, 3), Decl(b.ts, 18, 3))
->c.inGetter : Symbol(C.inGetter, Decl(a.js, 21, 28), Decl(a.js, 24, 14))
+>stringOrNumberOrUndefined : Symbol(stringOrNumberOrUndefined, Decl(b.ts, 5, 3), Decl(b.ts, 7, 3), Decl(b.ts, 8, 3), Decl(b.ts, 9, 3), Decl(b.ts, 10, 3), Decl(b.ts, 11, 3), Decl(b.ts, 18, 3), Decl(b.ts, 19, 3), Decl(b.ts, 20, 3), Decl(b.ts, 21, 3), Decl(b.ts, 22, 3))
+>c.inGetter : Symbol(C.inGetter, Decl(a.js, 30, 28), Decl(a.js, 33, 14))
 >c : Symbol(c, Decl(b.ts, 0, 3))
->inGetter : Symbol(C.inGetter, Decl(a.js, 21, 28), Decl(a.js, 24, 14))
+>inGetter : Symbol(C.inGetter, Decl(a.js, 30, 28), Decl(a.js, 33, 14))
 
 var stringOrNumberOrUndefined = c.inSetter;
->stringOrNumberOrUndefined : Symbol(stringOrNumberOrUndefined, Decl(b.ts, 5, 3), Decl(b.ts, 7, 3), Decl(b.ts, 8, 3), Decl(b.ts, 9, 3), Decl(b.ts, 16, 3), Decl(b.ts, 17, 3), Decl(b.ts, 18, 3))
->c.inSetter : Symbol(C.inSetter, Decl(a.js, 30, 28), Decl(a.js, 33, 14))
+>stringOrNumberOrUndefined : Symbol(stringOrNumberOrUndefined, Decl(b.ts, 5, 3), Decl(b.ts, 7, 3), Decl(b.ts, 8, 3), Decl(b.ts, 9, 3), Decl(b.ts, 10, 3), Decl(b.ts, 11, 3), Decl(b.ts, 18, 3), Decl(b.ts, 19, 3), Decl(b.ts, 20, 3), Decl(b.ts, 21, 3), Decl(b.ts, 22, 3))
+>c.inSetter : Symbol(C.inSetter, Decl(a.js, 39, 28), Decl(a.js, 42, 14))
 >c : Symbol(c, Decl(b.ts, 0, 3))
->inSetter : Symbol(C.inSetter, Decl(a.js, 30, 28), Decl(a.js, 33, 14))
+>inSetter : Symbol(C.inSetter, Decl(a.js, 39, 28), Decl(a.js, 42, 14))
+
+var stringOrNumberOrUndefined = c.inPropertyDeclaration;
+>stringOrNumberOrUndefined : Symbol(stringOrNumberOrUndefined, Decl(b.ts, 5, 3), Decl(b.ts, 7, 3), Decl(b.ts, 8, 3), Decl(b.ts, 9, 3), Decl(b.ts, 10, 3), Decl(b.ts, 11, 3), Decl(b.ts, 18, 3), Decl(b.ts, 19, 3), Decl(b.ts, 20, 3), Decl(b.ts, 21, 3), Decl(b.ts, 22, 3))
+>c.inPropertyDeclaration : Symbol(C.inPropertyDeclaration, Decl(a.js, 47, 28), Decl(a.js, 50, 14))
+>c : Symbol(c, Decl(b.ts, 0, 3))
+>inPropertyDeclaration : Symbol(C.inPropertyDeclaration, Decl(a.js, 47, 28), Decl(a.js, 50, 14))
+
+var stringOrNumberOrUndefined = c.inNestedArrowFunction
+>stringOrNumberOrUndefined : Symbol(stringOrNumberOrUndefined, Decl(b.ts, 5, 3), Decl(b.ts, 7, 3), Decl(b.ts, 8, 3), Decl(b.ts, 9, 3), Decl(b.ts, 10, 3), Decl(b.ts, 11, 3), Decl(b.ts, 18, 3), Decl(b.ts, 19, 3), Decl(b.ts, 20, 3), Decl(b.ts, 21, 3), Decl(b.ts, 22, 3))
+>c.inNestedArrowFunction : Symbol(C.inNestedArrowFunction, Decl(a.js, 21, 32), Decl(a.js, 24, 18))
+>c : Symbol(c, Decl(b.ts, 0, 3))
+>inNestedArrowFunction : Symbol(C.inNestedArrowFunction, Decl(a.js, 21, 32), Decl(a.js, 24, 18))
 
 var stringOrNumberOrBoolean: string | number | boolean;
->stringOrNumberOrBoolean : Symbol(stringOrNumberOrBoolean, Decl(b.ts, 11, 3), Decl(b.ts, 13, 3))
+>stringOrNumberOrBoolean : Symbol(stringOrNumberOrBoolean, Decl(b.ts, 13, 3), Decl(b.ts, 15, 3))
 
 var stringOrNumberOrBoolean = c.inMultiple;
->stringOrNumberOrBoolean : Symbol(stringOrNumberOrBoolean, Decl(b.ts, 11, 3), Decl(b.ts, 13, 3))
->c.inMultiple : Symbol(C.inMultiple, Decl(a.js, 8, 9), Decl(a.js, 17, 9), Decl(a.js, 26, 9))
+>stringOrNumberOrBoolean : Symbol(stringOrNumberOrBoolean, Decl(b.ts, 13, 3), Decl(b.ts, 15, 3))
+>c.inMultiple : Symbol(C.inMultiple, Decl(a.js, 8, 9), Decl(a.js, 17, 9), Decl(a.js, 35, 9))
 >c : Symbol(c, Decl(b.ts, 0, 3))
->inMultiple : Symbol(C.inMultiple, Decl(a.js, 8, 9), Decl(a.js, 17, 9), Decl(a.js, 26, 9))
+>inMultiple : Symbol(C.inMultiple, Decl(a.js, 8, 9), Decl(a.js, 17, 9), Decl(a.js, 35, 9))
 
 
 var stringOrNumberOrUndefined = C.inStaticMethod;
->stringOrNumberOrUndefined : Symbol(stringOrNumberOrUndefined, Decl(b.ts, 5, 3), Decl(b.ts, 7, 3), Decl(b.ts, 8, 3), Decl(b.ts, 9, 3), Decl(b.ts, 16, 3), Decl(b.ts, 17, 3), Decl(b.ts, 18, 3))
->C.inStaticMethod : Symbol(C.inStaticMethod, Decl(a.js, 38, 28), Decl(a.js, 41, 14))
+>stringOrNumberOrUndefined : Symbol(stringOrNumberOrUndefined, Decl(b.ts, 5, 3), Decl(b.ts, 7, 3), Decl(b.ts, 8, 3), Decl(b.ts, 9, 3), Decl(b.ts, 10, 3), Decl(b.ts, 11, 3), Decl(b.ts, 18, 3), Decl(b.ts, 19, 3), Decl(b.ts, 20, 3), Decl(b.ts, 21, 3), Decl(b.ts, 22, 3))
+>C.inStaticMethod : Symbol(C.inStaticMethod, Decl(a.js, 55, 28), Decl(a.js, 58, 14))
 >C : Symbol(C, Decl(a.js, 0, 0))
->inStaticMethod : Symbol(C.inStaticMethod, Decl(a.js, 38, 28), Decl(a.js, 41, 14))
+>inStaticMethod : Symbol(C.inStaticMethod, Decl(a.js, 55, 28), Decl(a.js, 58, 14))
 
 var stringOrNumberOrUndefined = C.inStaticGetter;
->stringOrNumberOrUndefined : Symbol(stringOrNumberOrUndefined, Decl(b.ts, 5, 3), Decl(b.ts, 7, 3), Decl(b.ts, 8, 3), Decl(b.ts, 9, 3), Decl(b.ts, 16, 3), Decl(b.ts, 17, 3), Decl(b.ts, 18, 3))
->C.inStaticGetter : Symbol(C.inStaticGetter, Decl(a.js, 46, 28), Decl(a.js, 49, 14))
+>stringOrNumberOrUndefined : Symbol(stringOrNumberOrUndefined, Decl(b.ts, 5, 3), Decl(b.ts, 7, 3), Decl(b.ts, 8, 3), Decl(b.ts, 9, 3), Decl(b.ts, 10, 3), Decl(b.ts, 11, 3), Decl(b.ts, 18, 3), Decl(b.ts, 19, 3), Decl(b.ts, 20, 3), Decl(b.ts, 21, 3), Decl(b.ts, 22, 3))
+>C.inStaticGetter : Symbol(C.inStaticGetter, Decl(a.js, 72, 28), Decl(a.js, 75, 14))
 >C : Symbol(C, Decl(a.js, 0, 0))
->inStaticGetter : Symbol(C.inStaticGetter, Decl(a.js, 46, 28), Decl(a.js, 49, 14))
+>inStaticGetter : Symbol(C.inStaticGetter, Decl(a.js, 72, 28), Decl(a.js, 75, 14))
 
 var stringOrNumberOrUndefined = C.inStaticSetter;
->stringOrNumberOrUndefined : Symbol(stringOrNumberOrUndefined, Decl(b.ts, 5, 3), Decl(b.ts, 7, 3), Decl(b.ts, 8, 3), Decl(b.ts, 9, 3), Decl(b.ts, 16, 3), Decl(b.ts, 17, 3), Decl(b.ts, 18, 3))
->C.inStaticSetter : Symbol(C.inStaticSetter, Decl(a.js, 54, 28), Decl(a.js, 57, 14))
+>stringOrNumberOrUndefined : Symbol(stringOrNumberOrUndefined, Decl(b.ts, 5, 3), Decl(b.ts, 7, 3), Decl(b.ts, 8, 3), Decl(b.ts, 9, 3), Decl(b.ts, 10, 3), Decl(b.ts, 11, 3), Decl(b.ts, 18, 3), Decl(b.ts, 19, 3), Decl(b.ts, 20, 3), Decl(b.ts, 21, 3), Decl(b.ts, 22, 3))
+>C.inStaticSetter : Symbol(C.inStaticSetter, Decl(a.js, 80, 28), Decl(a.js, 83, 14))
 >C : Symbol(C, Decl(a.js, 0, 0))
->inStaticSetter : Symbol(C.inStaticSetter, Decl(a.js, 54, 28), Decl(a.js, 57, 14))
+>inStaticSetter : Symbol(C.inStaticSetter, Decl(a.js, 80, 28), Decl(a.js, 83, 14))
+
+var stringOrNumberOrUndefined = C.inStaticPropertyDeclaration;
+>stringOrNumberOrUndefined : Symbol(stringOrNumberOrUndefined, Decl(b.ts, 5, 3), Decl(b.ts, 7, 3), Decl(b.ts, 8, 3), Decl(b.ts, 9, 3), Decl(b.ts, 10, 3), Decl(b.ts, 11, 3), Decl(b.ts, 18, 3), Decl(b.ts, 19, 3), Decl(b.ts, 20, 3), Decl(b.ts, 21, 3), Decl(b.ts, 22, 3))
+>C.inStaticPropertyDeclaration : Symbol(C.inStaticPropertyDeclaration, Decl(a.js, 88, 28), Decl(a.js, 91, 14))
+>C : Symbol(C, Decl(a.js, 0, 0))
+>inStaticPropertyDeclaration : Symbol(C.inStaticPropertyDeclaration, Decl(a.js, 88, 28), Decl(a.js, 91, 14))
+
+var stringOrNumberOrUndefined = C.inStaticNestedArrowFunction;
+>stringOrNumberOrUndefined : Symbol(stringOrNumberOrUndefined, Decl(b.ts, 5, 3), Decl(b.ts, 7, 3), Decl(b.ts, 8, 3), Decl(b.ts, 9, 3), Decl(b.ts, 10, 3), Decl(b.ts, 11, 3), Decl(b.ts, 18, 3), Decl(b.ts, 19, 3), Decl(b.ts, 20, 3), Decl(b.ts, 21, 3), Decl(b.ts, 22, 3))
+>C.inStaticNestedArrowFunction : Symbol(C.inStaticNestedArrowFunction, Decl(a.js, 63, 32), Decl(a.js, 66, 18))
+>C : Symbol(C, Decl(a.js, 0, 0))
+>inStaticNestedArrowFunction : Symbol(C.inStaticNestedArrowFunction, Decl(a.js, 63, 32), Decl(a.js, 66, 18))
 
diff --git a/tests/baselines/reference/inferringClassMembersFromAssignments.types b/tests/baselines/reference/inferringClassMembersFromAssignments.types
index 547cc62ba32..d759009983c 100644
--- a/tests/baselines/reference/inferringClassMembersFromAssignments.types
+++ b/tests/baselines/reference/inferringClassMembersFromAssignments.types
@@ -62,6 +62,33 @@ class C {
 >this : this
 >inMultiple : string | number | boolean
 >"string" : "string"
+
+        var action = () => {
+>action : () => void
+>() => {            if (Math.random()) {                this.inNestedArrowFunction = 0;            }            else {                this.inNestedArrowFunction = "string"            }        } : () => void
+
+            if (Math.random()) {
+>Math.random() : number
+>Math.random : () => number
+>Math : Math
+>random : () => number
+
+                this.inNestedArrowFunction = 0;
+>this.inNestedArrowFunction = 0 : 0
+>this.inNestedArrowFunction : string | number | undefined
+>this : this
+>inNestedArrowFunction : string | number | undefined
+>0 : 0
+            }
+            else {
+                this.inNestedArrowFunction = "string"
+>this.inNestedArrowFunction = "string" : "string"
+>this.inNestedArrowFunction : string | number | undefined
+>this : this
+>inNestedArrowFunction : string | number | undefined
+>"string" : "string"
+            }
+        };
     }
     get() {
 >get : () => void
@@ -116,6 +143,32 @@ class C {
 >this.inSetter : string | number | undefined
 >this : this
 >inSetter : string | number | undefined
+>"string" : "string"
+        }
+    }
+    prop = () => {
+>prop : () => void
+>() => {        if (Math.random()) {            this.inPropertyDeclaration = 0;        }        else {            this.inPropertyDeclaration = "string"        }    } : () => void
+
+        if (Math.random()) {
+>Math.random() : number
+>Math.random : () => number
+>Math : Math
+>random : () => number
+
+            this.inPropertyDeclaration = 0;
+>this.inPropertyDeclaration = 0 : 0
+>this.inPropertyDeclaration : string | number | undefined
+>this : this
+>inPropertyDeclaration : string | number | undefined
+>0 : 0
+        }
+        else {
+            this.inPropertyDeclaration = "string"
+>this.inPropertyDeclaration = "string" : "string"
+>this.inPropertyDeclaration : string | number | undefined
+>this : this
+>inPropertyDeclaration : string | number | undefined
 >"string" : "string"
         }
     }
@@ -143,6 +196,33 @@ class C {
 >inStaticMethod : string | number | undefined
 >"string" : "string"
         }
+
+        var action = () => {
+>action : () => void
+>() => {            if (Math.random()) {                this.inStaticNestedArrowFunction = 0;            }            else {                this.inStaticNestedArrowFunction = "string"            }        } : () => void
+
+            if (Math.random()) {
+>Math.random() : number
+>Math.random : () => number
+>Math : Math
+>random : () => number
+
+                this.inStaticNestedArrowFunction = 0;
+>this.inStaticNestedArrowFunction = 0 : 0
+>this.inStaticNestedArrowFunction : string | number | undefined
+>this : typeof C
+>inStaticNestedArrowFunction : string | number | undefined
+>0 : 0
+            }
+            else {
+                this.inStaticNestedArrowFunction = "string"
+>this.inStaticNestedArrowFunction = "string" : "string"
+>this.inStaticNestedArrowFunction : string | number | undefined
+>this : typeof C
+>inStaticNestedArrowFunction : string | number | undefined
+>"string" : "string"
+            }
+        };
     }
     static get() {
 >get : () => void
@@ -191,6 +271,32 @@ class C {
 >this.inStaticSetter : string | number | undefined
 >this : typeof C
 >inStaticSetter : string | number | undefined
+>"string" : "string"
+        }
+    }
+    static prop = () => {
+>prop : () => void
+>() => {        if (Math.random()) {            this.inStaticPropertyDeclaration = 0;        }        else {            this.inStaticPropertyDeclaration = "string"        }    } : () => void
+
+        if (Math.random()) {
+>Math.random() : number
+>Math.random : () => number
+>Math : Math
+>random : () => number
+
+            this.inStaticPropertyDeclaration = 0;
+>this.inStaticPropertyDeclaration = 0 : 0
+>this.inStaticPropertyDeclaration : string | number | undefined
+>this : typeof C
+>inStaticPropertyDeclaration : string | number | undefined
+>0 : 0
+        }
+        else {
+            this.inStaticPropertyDeclaration = "string"
+>this.inStaticPropertyDeclaration = "string" : "string"
+>this.inStaticPropertyDeclaration : string | number | undefined
+>this : typeof C
+>inStaticPropertyDeclaration : string | number | undefined
 >"string" : "string"
         }
     }
@@ -232,6 +338,18 @@ var stringOrNumberOrUndefined = c.inSetter;
 >c : C
 >inSetter : string | number | undefined
 
+var stringOrNumberOrUndefined = c.inPropertyDeclaration;
+>stringOrNumberOrUndefined : string | number | undefined
+>c.inPropertyDeclaration : string | number | undefined
+>c : C
+>inPropertyDeclaration : string | number | undefined
+
+var stringOrNumberOrUndefined = c.inNestedArrowFunction
+>stringOrNumberOrUndefined : string | number | undefined
+>c.inNestedArrowFunction : string | number | undefined
+>c : C
+>inNestedArrowFunction : string | number | undefined
+
 var stringOrNumberOrBoolean: string | number | boolean;
 >stringOrNumberOrBoolean : string | number | boolean
 
@@ -260,3 +378,15 @@ var stringOrNumberOrUndefined = C.inStaticSetter;
 >C : typeof C
 >inStaticSetter : string | number | undefined
 
+var stringOrNumberOrUndefined = C.inStaticPropertyDeclaration;
+>stringOrNumberOrUndefined : string | number | undefined
+>C.inStaticPropertyDeclaration : string | number | undefined
+>C : typeof C
+>inStaticPropertyDeclaration : string | number | undefined
+
+var stringOrNumberOrUndefined = C.inStaticNestedArrowFunction;
+>stringOrNumberOrUndefined : string | number | undefined
+>C.inStaticNestedArrowFunction : string | number | undefined
+>C : typeof C
+>inStaticNestedArrowFunction : string | number | undefined
+
diff --git a/tests/baselines/reference/keyofAndIndexedAccess.symbols b/tests/baselines/reference/keyofAndIndexedAccess.symbols
index f6425b5ed0e..d5c4660d474 100644
--- a/tests/baselines/reference/keyofAndIndexedAccess.symbols
+++ b/tests/baselines/reference/keyofAndIndexedAccess.symbols
@@ -454,9 +454,9 @@ function pluck<T, K extends keyof T>(array: T[], key: K) {
 >K : Symbol(K, Decl(keyofAndIndexedAccess.ts, 132, 17))
 
     return array.map(x => x[key]);
->array.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>array.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >array : Symbol(array, Decl(keyofAndIndexedAccess.ts, 132, 37))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >x : Symbol(x, Decl(keyofAndIndexedAccess.ts, 133, 21))
 >x : Symbol(x, Decl(keyofAndIndexedAccess.ts, 133, 21))
 >key : Symbol(key, Decl(keyofAndIndexedAccess.ts, 132, 48))
diff --git a/tests/baselines/reference/keyofAndIndexedAccess.types b/tests/baselines/reference/keyofAndIndexedAccess.types
index 86469efc284..66605b41b75 100644
--- a/tests/baselines/reference/keyofAndIndexedAccess.types
+++ b/tests/baselines/reference/keyofAndIndexedAccess.types
@@ -523,10 +523,10 @@ function pluck<T, K extends keyof T>(array: T[], key: K) {
 
     return array.map(x => x[key]);
 >array.map(x => x[key]) : T[K][]
->array.map : { <U>(this: [T, T, T, T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [T, T, T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [T, T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U, U]; <U>(this: [T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): U[]; }
+>array.map : { <U>(this: [T, T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U, U, U, U]; <U>(this: [T, T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [T, T, T, T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U, U, U]; <U>(this: [T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [T, T, T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U, U]; <U>(this: [T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [T, T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U, U]; <U>(this: [T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U]; <U>(this: [T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): U[]; <U>(callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): U[]; }
 >array : T[]
->map : { <U>(this: [T, T, T, T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [T, T, T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [T, T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U, U]; <U>(this: [T, T], callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: T, index: number, array: T[]) => U, thisArg?: any): U[]; }
->x => x[key] : (x: T) => T[K]
+>map : { <U>(this: [T, T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U, U, U, U]; <U>(this: [T, T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [T, T, T, T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U, U, U]; <U>(this: [T, T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [T, T, T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U, U]; <U>(this: [T, T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [T, T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U, U]; <U>(this: [T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): [U, U]; <U>(this: [T, T], callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [T, T], callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: T, index: number, array: T[]) => U): U[]; <U>(callbackfn: (this: undefined, value: T, index: number, array: T[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: T, index: number, array: T[]) => U, thisArg: Z): U[]; }
+>x => x[key] : (this: undefined, x: T) => T[K]
 >x : T
 >x[key] : T[K]
 >x : T
diff --git a/tests/baselines/reference/mapOnTupleTypes01.symbols b/tests/baselines/reference/mapOnTupleTypes01.symbols
index 1dbfca4a4c3..0733b1d5b02 100644
--- a/tests/baselines/reference/mapOnTupleTypes01.symbols
+++ b/tests/baselines/reference/mapOnTupleTypes01.symbols
@@ -2,8 +2,8 @@
 
 export let mapOnLooseArrayLiteral = [1, 2, 3, 4].map(n => n * n);
 >mapOnLooseArrayLiteral : Symbol(mapOnLooseArrayLiteral, Decl(mapOnTupleTypes01.ts, 1, 10))
->[1, 2, 3, 4].map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>[1, 2, 3, 4].map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >n : Symbol(n, Decl(mapOnTupleTypes01.ts, 1, 53))
 >n : Symbol(n, Decl(mapOnTupleTypes01.ts, 1, 53))
 >n : Symbol(n, Decl(mapOnTupleTypes01.ts, 1, 53))
@@ -15,9 +15,9 @@ let numTuple: [number] = [1];
 
 export let a = numTuple.map(x => x * x);
 >a : Symbol(a, Decl(mapOnTupleTypes01.ts, 6, 10))
->numTuple.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>numTuple.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >numTuple : Symbol(numTuple, Decl(mapOnTupleTypes01.ts, 5, 3))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >x : Symbol(x, Decl(mapOnTupleTypes01.ts, 6, 28))
 >x : Symbol(x, Decl(mapOnTupleTypes01.ts, 6, 28))
 >x : Symbol(x, Decl(mapOnTupleTypes01.ts, 6, 28))
@@ -35,18 +35,18 @@ let numStr: [number, string] = [    100, "hello"];
 
 export let b = numNum.map(n => n * n);
 >b : Symbol(b, Decl(mapOnTupleTypes01.ts, 14, 10))
->numNum.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>numNum.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >numNum : Symbol(numNum, Decl(mapOnTupleTypes01.ts, 10, 3))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >n : Symbol(n, Decl(mapOnTupleTypes01.ts, 14, 26))
 >n : Symbol(n, Decl(mapOnTupleTypes01.ts, 14, 26))
 >n : Symbol(n, Decl(mapOnTupleTypes01.ts, 14, 26))
 
 export let c = strStr.map(s => s.charCodeAt(0));
 >c : Symbol(c, Decl(mapOnTupleTypes01.ts, 15, 10))
->strStr.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>strStr.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >strStr : Symbol(strStr, Decl(mapOnTupleTypes01.ts, 11, 3))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >s : Symbol(s, Decl(mapOnTupleTypes01.ts, 15, 26))
 >s.charCodeAt : Symbol(String.charCodeAt, Decl(lib.d.ts, --, --))
 >s : Symbol(s, Decl(mapOnTupleTypes01.ts, 15, 26))
@@ -54,9 +54,9 @@ export let c = strStr.map(s => s.charCodeAt(0));
 
 export let d = numStr.map(x => x);
 >d : Symbol(d, Decl(mapOnTupleTypes01.ts, 16, 10))
->numStr.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>numStr.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >numStr : Symbol(numStr, Decl(mapOnTupleTypes01.ts, 12, 3))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >x : Symbol(x, Decl(mapOnTupleTypes01.ts, 16, 26))
 >x : Symbol(x, Decl(mapOnTupleTypes01.ts, 16, 26))
 
@@ -67,9 +67,9 @@ let numNumNum: [number, number, number] = [1, 2, 3];
 
 export let e = numNumNum.map(n => n * n);
 >e : Symbol(e, Decl(mapOnTupleTypes01.ts, 22, 10))
->numNumNum.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>numNumNum.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >numNumNum : Symbol(numNumNum, Decl(mapOnTupleTypes01.ts, 20, 3))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >n : Symbol(n, Decl(mapOnTupleTypes01.ts, 22, 29))
 >n : Symbol(n, Decl(mapOnTupleTypes01.ts, 22, 29))
 >n : Symbol(n, Decl(mapOnTupleTypes01.ts, 22, 29))
@@ -81,9 +81,9 @@ let numNumNumNum: [number, number, number, number] = [1, 2, 3, 4];
 
 export let f = numNumNumNum.map(n => n * n);
 >f : Symbol(f, Decl(mapOnTupleTypes01.ts, 28, 10))
->numNumNumNum.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>numNumNumNum.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >numNumNumNum : Symbol(numNumNumNum, Decl(mapOnTupleTypes01.ts, 26, 3))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >n : Symbol(n, Decl(mapOnTupleTypes01.ts, 28, 32))
 >n : Symbol(n, Decl(mapOnTupleTypes01.ts, 28, 32))
 >n : Symbol(n, Decl(mapOnTupleTypes01.ts, 28, 32))
@@ -95,9 +95,9 @@ let numNumNumNumNum: [number, number, number, number, number] = [1, 2, 3, 4, 5];
 
 export let g = numNumNumNumNum.map(n => n * n);
 >g : Symbol(g, Decl(mapOnTupleTypes01.ts, 34, 10))
->numNumNumNumNum.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>numNumNumNumNum.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >numNumNumNumNum : Symbol(numNumNumNumNum, Decl(mapOnTupleTypes01.ts, 32, 3))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >n : Symbol(n, Decl(mapOnTupleTypes01.ts, 34, 35))
 >n : Symbol(n, Decl(mapOnTupleTypes01.ts, 34, 35))
 >n : Symbol(n, Decl(mapOnTupleTypes01.ts, 34, 35))
@@ -110,9 +110,9 @@ let numNumNumNumNumNum: [number, number, number, number, number, number] = [1, 2
 
 export let h = numNumNumNumNum.map(n => n * n);
 >h : Symbol(h, Decl(mapOnTupleTypes01.ts, 41, 10))
->numNumNumNumNum.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>numNumNumNumNum.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >numNumNumNumNum : Symbol(numNumNumNumNum, Decl(mapOnTupleTypes01.ts, 32, 3))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >n : Symbol(n, Decl(mapOnTupleTypes01.ts, 41, 35))
 >n : Symbol(n, Decl(mapOnTupleTypes01.ts, 41, 35))
 >n : Symbol(n, Decl(mapOnTupleTypes01.ts, 41, 35))
diff --git a/tests/baselines/reference/mapOnTupleTypes01.types b/tests/baselines/reference/mapOnTupleTypes01.types
index 0a01ecfa380..b8230d3fdf5 100644
--- a/tests/baselines/reference/mapOnTupleTypes01.types
+++ b/tests/baselines/reference/mapOnTupleTypes01.types
@@ -3,14 +3,14 @@
 export let mapOnLooseArrayLiteral = [1, 2, 3, 4].map(n => n * n);
 >mapOnLooseArrayLiteral : number[]
 >[1, 2, 3, 4].map(n => n * n) : number[]
->[1, 2, 3, 4].map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
+>[1, 2, 3, 4].map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
 >[1, 2, 3, 4] : number[]
 >1 : 1
 >2 : 2
 >3 : 3
 >4 : 4
->map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
->n => n * n : (n: number) => number
+>map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
+>n => n * n : (this: undefined, n: number) => number
 >n : number
 >n * n : number
 >n : number
@@ -26,10 +26,10 @@ let numTuple: [number] = [1];
 export let a = numTuple.map(x => x * x);
 >a : number[]
 >numTuple.map(x => x * x) : number[]
->numTuple.map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
+>numTuple.map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
 >numTuple : [number]
->map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
->x => x * x : (x: number) => number
+>map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
+>x => x * x : (this: undefined, x: number) => number
 >x : number
 >x * x : number
 >x : number
@@ -58,10 +58,10 @@ let numStr: [number, string] = [    100, "hello"];
 export let b = numNum.map(n => n * n);
 >b : [number, number]
 >numNum.map(n => n * n) : [number, number]
->numNum.map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
+>numNum.map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
 >numNum : [number, number]
->map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
->n => n * n : (n: number) => number
+>map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
+>n => n * n : (this: undefined, n: number) => number
 >n : number
 >n * n : number
 >n : number
@@ -70,10 +70,10 @@ export let b = numNum.map(n => n * n);
 export let c = strStr.map(s => s.charCodeAt(0));
 >c : [number, number]
 >strStr.map(s => s.charCodeAt(0)) : [number, number]
->strStr.map : { <U>(this: [string, string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U]; <U>(this: [string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): U[]; }
+>strStr.map : { <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U, U]; <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [string, string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): U[]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): U[]; }
 >strStr : [string, string]
->map : { <U>(this: [string, string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U]; <U>(this: [string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): U[]; }
->s => s.charCodeAt(0) : (s: string) => number
+>map : { <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U, U]; <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [string, string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): U[]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): U[]; }
+>s => s.charCodeAt(0) : (this: undefined, s: string) => number
 >s : string
 >s.charCodeAt(0) : number
 >s.charCodeAt : (index: number) => number
@@ -84,10 +84,10 @@ export let c = strStr.map(s => s.charCodeAt(0));
 export let d = numStr.map(x => x);
 >d : [string | number, string | number]
 >numStr.map(x => x) : [string | number, string | number]
->numStr.map : { <U>(this: [string | number, string | number, string | number, string | number, string | number], callbackfn: (value: string | number, index: number, array: (string | number)[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [string | number, string | number, string | number, string | number], callbackfn: (value: string | number, index: number, array: (string | number)[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [string | number, string | number, string | number], callbackfn: (value: string | number, index: number, array: (string | number)[]) => U, thisArg?: any): [U, U, U]; <U>(this: [string | number, string | number], callbackfn: (value: string | number, index: number, array: (string | number)[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: string | number, index: number, array: (string | number)[]) => U, thisArg?: any): U[]; }
+>numStr.map : { <U>(this: [string | number, string | number, string | number, string | number, string | number], callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => U): [U, U, U, U, U]; <U>(this: [string | number, string | number, string | number, string | number, string | number], callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [string | number, string | number, string | number, string | number, string | number], callbackfn: (this: Z, value: string | number, index: number, array: (string | number)[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [string | number, string | number, string | number, string | number], callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => U): [U, U, U, U]; <U>(this: [string | number, string | number, string | number, string | number], callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [string | number, string | number, string | number, string | number], callbackfn: (this: Z, value: string | number, index: number, array: (string | number)[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [string | number, string | number, string | number], callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => U): [U, U, U]; <U>(this: [string | number, string | number, string | number], callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [string | number, string | number, string | number], callbackfn: (this: Z, value: string | number, index: number, array: (string | number)[]) => U, thisArg: Z): [U, U, U]; <U>(this: [string | number, string | number], callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => U): [U, U]; <U>(this: [string | number, string | number], callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [string | number, string | number], callbackfn: (this: Z, value: string | number, index: number, array: (string | number)[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => U): U[]; <U>(callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: string | number, index: number, array: (string | number)[]) => U, thisArg: Z): U[]; }
 >numStr : [number, string]
->map : { <U>(this: [string | number, string | number, string | number, string | number, string | number], callbackfn: (value: string | number, index: number, array: (string | number)[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [string | number, string | number, string | number, string | number], callbackfn: (value: string | number, index: number, array: (string | number)[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [string | number, string | number, string | number], callbackfn: (value: string | number, index: number, array: (string | number)[]) => U, thisArg?: any): [U, U, U]; <U>(this: [string | number, string | number], callbackfn: (value: string | number, index: number, array: (string | number)[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: string | number, index: number, array: (string | number)[]) => U, thisArg?: any): U[]; }
->x => x : (x: string | number) => string | number
+>map : { <U>(this: [string | number, string | number, string | number, string | number, string | number], callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => U): [U, U, U, U, U]; <U>(this: [string | number, string | number, string | number, string | number, string | number], callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [string | number, string | number, string | number, string | number, string | number], callbackfn: (this: Z, value: string | number, index: number, array: (string | number)[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [string | number, string | number, string | number, string | number], callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => U): [U, U, U, U]; <U>(this: [string | number, string | number, string | number, string | number], callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [string | number, string | number, string | number, string | number], callbackfn: (this: Z, value: string | number, index: number, array: (string | number)[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [string | number, string | number, string | number], callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => U): [U, U, U]; <U>(this: [string | number, string | number, string | number], callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [string | number, string | number, string | number], callbackfn: (this: Z, value: string | number, index: number, array: (string | number)[]) => U, thisArg: Z): [U, U, U]; <U>(this: [string | number, string | number], callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => U): [U, U]; <U>(this: [string | number, string | number], callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [string | number, string | number], callbackfn: (this: Z, value: string | number, index: number, array: (string | number)[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => U): U[]; <U>(callbackfn: (this: undefined, value: string | number, index: number, array: (string | number)[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: string | number, index: number, array: (string | number)[]) => U, thisArg: Z): U[]; }
+>x => x : (this: undefined, x: string | number) => string | number
 >x : string | number
 >x : string | number
 
@@ -103,10 +103,10 @@ let numNumNum: [number, number, number] = [1, 2, 3];
 export let e = numNumNum.map(n => n * n);
 >e : [number, number, number]
 >numNumNum.map(n => n * n) : [number, number, number]
->numNumNum.map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
+>numNumNum.map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
 >numNumNum : [number, number, number]
->map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
->n => n * n : (n: number) => number
+>map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
+>n => n * n : (this: undefined, n: number) => number
 >n : number
 >n * n : number
 >n : number
@@ -125,10 +125,10 @@ let numNumNumNum: [number, number, number, number] = [1, 2, 3, 4];
 export let f = numNumNumNum.map(n => n * n);
 >f : [number, number, number, number]
 >numNumNumNum.map(n => n * n) : [number, number, number, number]
->numNumNumNum.map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
+>numNumNumNum.map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
 >numNumNumNum : [number, number, number, number]
->map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
->n => n * n : (n: number) => number
+>map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
+>n => n * n : (this: undefined, n: number) => number
 >n : number
 >n * n : number
 >n : number
@@ -148,10 +148,10 @@ let numNumNumNumNum: [number, number, number, number, number] = [1, 2, 3, 4, 5];
 export let g = numNumNumNumNum.map(n => n * n);
 >g : [number, number, number, number, number]
 >numNumNumNumNum.map(n => n * n) : [number, number, number, number, number]
->numNumNumNumNum.map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
+>numNumNumNumNum.map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
 >numNumNumNumNum : [number, number, number, number, number]
->map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
->n => n * n : (n: number) => number
+>map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
+>n => n * n : (this: undefined, n: number) => number
 >n : number
 >n * n : number
 >n : number
@@ -173,10 +173,10 @@ let numNumNumNumNumNum: [number, number, number, number, number, number] = [1, 2
 export let h = numNumNumNumNum.map(n => n * n);
 >h : [number, number, number, number, number]
 >numNumNumNumNum.map(n => n * n) : [number, number, number, number, number]
->numNumNumNumNum.map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
+>numNumNumNumNum.map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
 >numNumNumNumNum : [number, number, number, number, number]
->map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
->n => n * n : (n: number) => number
+>map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
+>n => n * n : (this: undefined, n: number) => number
 >n : number
 >n * n : number
 >n : number
diff --git a/tests/baselines/reference/mapOnTupleTypes02.symbols b/tests/baselines/reference/mapOnTupleTypes02.symbols
index da27a13d4f6..6453caace91 100644
--- a/tests/baselines/reference/mapOnTupleTypes02.symbols
+++ b/tests/baselines/reference/mapOnTupleTypes02.symbols
@@ -9,9 +9,9 @@ export function increment(point: Point) {
 >Point : Symbol(Point, Decl(mapOnTupleTypes02.ts, 0, 0))
 
   return point.map(d => d + 1);
->point.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>point.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >point : Symbol(point, Decl(mapOnTupleTypes02.ts, 3, 26))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >d : Symbol(d, Decl(mapOnTupleTypes02.ts, 4, 19))
 >d : Symbol(d, Decl(mapOnTupleTypes02.ts, 4, 19))
 }
diff --git a/tests/baselines/reference/mapOnTupleTypes02.types b/tests/baselines/reference/mapOnTupleTypes02.types
index 3803e3c319e..5ec555ebf17 100644
--- a/tests/baselines/reference/mapOnTupleTypes02.types
+++ b/tests/baselines/reference/mapOnTupleTypes02.types
@@ -10,10 +10,10 @@ export function increment(point: Point) {
 
   return point.map(d => d + 1);
 >point.map(d => d + 1) : [number, number]
->point.map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
+>point.map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
 >point : [number, number]
->map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
->d => d + 1 : (d: number) => number
+>map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
+>d => d + 1 : (this: undefined, d: number) => number
 >d : number
 >d + 1 : number
 >d : number
diff --git a/tests/baselines/reference/mappedTypeRelationships.errors.txt b/tests/baselines/reference/mappedTypeRelationships.errors.txt
index 22f56dacaf6..bc26bb272f5 100644
--- a/tests/baselines/reference/mappedTypeRelationships.errors.txt
+++ b/tests/baselines/reference/mappedTypeRelationships.errors.txt
@@ -1,14 +1,18 @@
 tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(12,5): error TS2322: Type 'T[keyof T]' is not assignable to type 'U[keyof T]'.
-  Type 'T' is not assignable to type 'U'.
+  Type 'T[string]' is not assignable to type 'U[keyof T]'.
+    Type 'T' is not assignable to type 'U'.
 tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(17,5): error TS2322: Type 'T[K]' is not assignable to type 'U[K]'.
-  Type 'T' is not assignable to type 'U'.
+  Type 'T[string]' is not assignable to type 'U[K]'.
+    Type 'T' is not assignable to type 'U'.
 tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(21,5): error TS2536: Type 'keyof U' cannot be used to index type 'T'.
 tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(22,5): error TS2322: Type 'T[keyof U]' is not assignable to type 'U[keyof U]'.
-  Type 'T' is not assignable to type 'U'.
+  Type 'T[string]' is not assignable to type 'U[keyof U]'.
+    Type 'T' is not assignable to type 'U'.
 tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(22,12): error TS2536: Type 'keyof U' cannot be used to index type 'T'.
 tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(26,5): error TS2536: Type 'K' cannot be used to index type 'T'.
 tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(27,5): error TS2322: Type 'T[K]' is not assignable to type 'U[K]'.
-  Type 'T' is not assignable to type 'U'.
+  Type 'T[string]' is not assignable to type 'U[K]'.
+    Type 'T' is not assignable to type 'U'.
 tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(27,12): error TS2536: Type 'K' cannot be used to index type 'T'.
 tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(31,5): error TS2322: Type 'T[keyof T] | undefined' is not assignable to type 'T[keyof T]'.
   Type 'undefined' is not assignable to type 'T[keyof T]'.
@@ -17,13 +21,19 @@ tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(36,5): error TS2
 tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(41,5): error TS2322: Type 'U[keyof T] | undefined' is not assignable to type 'T[keyof T]'.
   Type 'undefined' is not assignable to type 'T[keyof T]'.
 tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(42,5): error TS2322: Type 'T[keyof T]' is not assignable to type 'U[keyof T] | undefined'.
-  Type 'T[keyof T]' is not assignable to type 'U[keyof T]'.
-    Type 'T' is not assignable to type 'U'.
+  Type 'T[string]' is not assignable to type 'U[keyof T] | undefined'.
+    Type 'T[string]' is not assignable to type 'U[keyof T]'.
+      Type 'T[keyof T]' is not assignable to type 'U[keyof T]'.
+        Type 'T[string]' is not assignable to type 'U[keyof T]'.
+          Type 'T' is not assignable to type 'U'.
 tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(46,5): error TS2322: Type 'U[K] | undefined' is not assignable to type 'T[K]'.
   Type 'undefined' is not assignable to type 'T[K]'.
 tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(47,5): error TS2322: Type 'T[K]' is not assignable to type 'U[K] | undefined'.
-  Type 'T[K]' is not assignable to type 'U[K]'.
-    Type 'T' is not assignable to type 'U'.
+  Type 'T[string]' is not assignable to type 'U[K] | undefined'.
+    Type 'T[string]' is not assignable to type 'U[K]'.
+      Type 'T[K]' is not assignable to type 'U[K]'.
+        Type 'T[string]' is not assignable to type 'U[K]'.
+          Type 'T' is not assignable to type 'U'.
 tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(52,5): error TS2542: Index signature in type 'Readonly<T>' only permits reading.
 tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(57,5): error TS2542: Index signature in type 'Readonly<T>' only permits reading.
 tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(62,5): error TS2542: Index signature in type 'Readonly<U>' only permits reading.
@@ -33,7 +43,8 @@ tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(76,5): error TS2
 tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(126,5): error TS2322: Type 'Partial<U>' is not assignable to type 'Identity<U>'.
 tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(142,5): error TS2322: Type '{ [P in keyof T]: T[P]; }' is not assignable to type '{ [P in keyof T]: U[P]; }'.
   Type 'T[P]' is not assignable to type 'U[P]'.
-    Type 'T' is not assignable to type 'U'.
+    Type 'T[string]' is not assignable to type 'U[P]'.
+      Type 'T' is not assignable to type 'U'.
 tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(147,5): error TS2322: Type '{ [P in keyof T]: T[P]; }' is not assignable to type '{ [P in keyof U]: U[P]; }'.
   Type 'keyof U' is not assignable to type 'keyof T'.
 tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(152,5): error TS2322: Type '{ [P in K]: T[P]; }' is not assignable to type '{ [P in keyof T]: T[P]; }'.
@@ -44,7 +55,8 @@ tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(162,5): error TS
   Type 'keyof T' is not assignable to type 'K'.
 tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(167,5): error TS2322: Type '{ [P in K]: T[P]; }' is not assignable to type '{ [P in K]: U[P]; }'.
   Type 'T[P]' is not assignable to type 'U[P]'.
-    Type 'T' is not assignable to type 'U'.
+    Type 'T[string]' is not assignable to type 'U[P]'.
+      Type 'T' is not assignable to type 'U'.
 
 
 ==== tests/cases/conformance/types/mapped/mappedTypeRelationships.ts (27 errors) ====
@@ -62,7 +74,8 @@ tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(167,5): error TS
         y[k] = x[k];  // Error
         ~~~~
 !!! error TS2322: Type 'T[keyof T]' is not assignable to type 'U[keyof T]'.
-!!! error TS2322:   Type 'T' is not assignable to type 'U'.
+!!! error TS2322:   Type 'T[string]' is not assignable to type 'U[keyof T]'.
+!!! error TS2322:     Type 'T' is not assignable to type 'U'.
     }
     
     function f4<T, U extends T, K extends keyof T>(x: T, y: U, k: K) {
@@ -70,7 +83,8 @@ tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(167,5): error TS
         y[k] = x[k];  // Error
         ~~~~
 !!! error TS2322: Type 'T[K]' is not assignable to type 'U[K]'.
-!!! error TS2322:   Type 'T' is not assignable to type 'U'.
+!!! error TS2322:   Type 'T[string]' is not assignable to type 'U[K]'.
+!!! error TS2322:     Type 'T' is not assignable to type 'U'.
     }
     
     function f5<T, U extends T>(x: T, y: U, k: keyof U) {
@@ -80,7 +94,8 @@ tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(167,5): error TS
         y[k] = x[k];  // Error
         ~~~~
 !!! error TS2322: Type 'T[keyof U]' is not assignable to type 'U[keyof U]'.
-!!! error TS2322:   Type 'T' is not assignable to type 'U'.
+!!! error TS2322:   Type 'T[string]' is not assignable to type 'U[keyof U]'.
+!!! error TS2322:     Type 'T' is not assignable to type 'U'.
                ~~~~
 !!! error TS2536: Type 'keyof U' cannot be used to index type 'T'.
     }
@@ -92,7 +107,8 @@ tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(167,5): error TS
         y[k] = x[k];  // Error
         ~~~~
 !!! error TS2322: Type 'T[K]' is not assignable to type 'U[K]'.
-!!! error TS2322:   Type 'T' is not assignable to type 'U'.
+!!! error TS2322:   Type 'T[string]' is not assignable to type 'U[K]'.
+!!! error TS2322:     Type 'T' is not assignable to type 'U'.
                ~~~~
 !!! error TS2536: Type 'K' cannot be used to index type 'T'.
     }
@@ -121,8 +137,11 @@ tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(167,5): error TS
         y[k] = x[k];  // Error
         ~~~~
 !!! error TS2322: Type 'T[keyof T]' is not assignable to type 'U[keyof T] | undefined'.
-!!! error TS2322:   Type 'T[keyof T]' is not assignable to type 'U[keyof T]'.
-!!! error TS2322:     Type 'T' is not assignable to type 'U'.
+!!! error TS2322:   Type 'T[string]' is not assignable to type 'U[keyof T] | undefined'.
+!!! error TS2322:     Type 'T[string]' is not assignable to type 'U[keyof T]'.
+!!! error TS2322:       Type 'T[keyof T]' is not assignable to type 'U[keyof T]'.
+!!! error TS2322:         Type 'T[string]' is not assignable to type 'U[keyof T]'.
+!!! error TS2322:           Type 'T' is not assignable to type 'U'.
     }
     
     function f13<T, U extends T, K extends keyof T>(x: T, y: Partial<U>, k: K) {
@@ -133,8 +152,11 @@ tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(167,5): error TS
         y[k] = x[k];  // Error
         ~~~~
 !!! error TS2322: Type 'T[K]' is not assignable to type 'U[K] | undefined'.
-!!! error TS2322:   Type 'T[K]' is not assignable to type 'U[K]'.
-!!! error TS2322:     Type 'T' is not assignable to type 'U'.
+!!! error TS2322:   Type 'T[string]' is not assignable to type 'U[K] | undefined'.
+!!! error TS2322:     Type 'T[string]' is not assignable to type 'U[K]'.
+!!! error TS2322:       Type 'T[K]' is not assignable to type 'U[K]'.
+!!! error TS2322:         Type 'T[string]' is not assignable to type 'U[K]'.
+!!! error TS2322:           Type 'T' is not assignable to type 'U'.
     }
     
     function f20<T>(x: T, y: Readonly<T>, k: keyof T) {
@@ -247,7 +269,8 @@ tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(167,5): error TS
         ~
 !!! error TS2322: Type '{ [P in keyof T]: T[P]; }' is not assignable to type '{ [P in keyof T]: U[P]; }'.
 !!! error TS2322:   Type 'T[P]' is not assignable to type 'U[P]'.
-!!! error TS2322:     Type 'T' is not assignable to type 'U'.
+!!! error TS2322:     Type 'T[string]' is not assignable to type 'U[P]'.
+!!! error TS2322:       Type 'T' is not assignable to type 'U'.
     }
     
     function f72<T, U extends T>(x: { [P in keyof T]: T[P] }, y: { [P in keyof U]: U[P] }) {
@@ -288,6 +311,7 @@ tests/cases/conformance/types/mapped/mappedTypeRelationships.ts(167,5): error TS
         ~
 !!! error TS2322: Type '{ [P in K]: T[P]; }' is not assignable to type '{ [P in K]: U[P]; }'.
 !!! error TS2322:   Type 'T[P]' is not assignable to type 'U[P]'.
-!!! error TS2322:     Type 'T' is not assignable to type 'U'.
+!!! error TS2322:     Type 'T[string]' is not assignable to type 'U[P]'.
+!!! error TS2322:       Type 'T' is not assignable to type 'U'.
     }
     
\ No newline at end of file
diff --git a/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions1.symbols b/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions1.symbols
index 62473581abe..ccee4a59a70 100644
--- a/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions1.symbols
+++ b/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions1.symbols
@@ -8,9 +8,9 @@ function f(x: number, y: number, z: number) {
 >z : Symbol(z, Decl(modularizeLibrary_NoErrorDuplicateLibOptions1.ts, 2, 32))
 
     return Array.from(arguments);
->Array.from : Symbol(ArrayConstructor.from, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>Array.from : Symbol(ArrayConstructor.from, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
 >Array : Symbol(Array, Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
->from : Symbol(ArrayConstructor.from, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>from : Symbol(ArrayConstructor.from, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
 >arguments : Symbol(arguments)
 }
 
diff --git a/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions1.types b/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions1.types
index b259e30172d..532ef5511fa 100644
--- a/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions1.types
+++ b/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions1.types
@@ -9,9 +9,9 @@ function f(x: number, y: number, z: number) {
 
     return Array.from(arguments);
 >Array.from(arguments) : any[]
->Array.from : { <T, U>(iterable: Iterable<T>, mapfn: (v: T, k: number) => U, thisArg?: any): U[]; <T>(iterable: Iterable<T>): T[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (v: T, k: number) => U, thisArg?: any): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
+>Array.from : { <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(iterable: Iterable<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(iterable: Iterable<T>): T[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(arrayLike: ArrayLike<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
 >Array : ArrayConstructor
->from : { <T, U>(iterable: Iterable<T>, mapfn: (v: T, k: number) => U, thisArg?: any): U[]; <T>(iterable: Iterable<T>): T[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (v: T, k: number) => U, thisArg?: any): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
+>from : { <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(iterable: Iterable<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(iterable: Iterable<T>): T[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(arrayLike: ArrayLike<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
 >arguments : IArguments
 }
 
diff --git a/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions2.symbols b/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions2.symbols
index ccb78b1c367..97c6852b503 100644
--- a/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions2.symbols
+++ b/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions2.symbols
@@ -8,9 +8,9 @@ function f(x: number, y: number, z: number) {
 >z : Symbol(z, Decl(modularizeLibrary_NoErrorDuplicateLibOptions2.ts, 2, 32))
 
     return Array.from(arguments);
->Array.from : Symbol(ArrayConstructor.from, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>Array.from : Symbol(ArrayConstructor.from, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
 >Array : Symbol(Array, Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
->from : Symbol(ArrayConstructor.from, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>from : Symbol(ArrayConstructor.from, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
 >arguments : Symbol(arguments)
 }
 
diff --git a/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions2.types b/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions2.types
index 4fa4c085bca..304b9411bff 100644
--- a/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions2.types
+++ b/tests/baselines/reference/modularizeLibrary_NoErrorDuplicateLibOptions2.types
@@ -9,9 +9,9 @@ function f(x: number, y: number, z: number) {
 
     return Array.from(arguments);
 >Array.from(arguments) : any[]
->Array.from : { <T, U>(iterable: Iterable<T>, mapfn: (v: T, k: number) => U, thisArg?: any): U[]; <T>(iterable: Iterable<T>): T[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (v: T, k: number) => U, thisArg?: any): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
+>Array.from : { <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(iterable: Iterable<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(iterable: Iterable<T>): T[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(arrayLike: ArrayLike<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
 >Array : ArrayConstructor
->from : { <T, U>(iterable: Iterable<T>, mapfn: (v: T, k: number) => U, thisArg?: any): U[]; <T>(iterable: Iterable<T>): T[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (v: T, k: number) => U, thisArg?: any): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
+>from : { <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(iterable: Iterable<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(iterable: Iterable<T>): T[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(arrayLike: ArrayLike<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
 >arguments : IArguments
 }
 
diff --git a/tests/baselines/reference/modularizeLibrary_TargetES5UsingES6Lib.symbols b/tests/baselines/reference/modularizeLibrary_TargetES5UsingES6Lib.symbols
index 0bbffee6c86..5aae1a6cb2f 100644
--- a/tests/baselines/reference/modularizeLibrary_TargetES5UsingES6Lib.symbols
+++ b/tests/baselines/reference/modularizeLibrary_TargetES5UsingES6Lib.symbols
@@ -8,9 +8,9 @@ function f(x: number, y: number, z: number) {
 >z : Symbol(z, Decl(modularizeLibrary_TargetES5UsingES6Lib.ts, 2, 32))
 
     return Array.from(arguments);
->Array.from : Symbol(ArrayConstructor.from, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>Array.from : Symbol(ArrayConstructor.from, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
 >Array : Symbol(Array, Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
->from : Symbol(ArrayConstructor.from, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>from : Symbol(ArrayConstructor.from, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
 >arguments : Symbol(arguments)
 }
 
diff --git a/tests/baselines/reference/modularizeLibrary_TargetES5UsingES6Lib.types b/tests/baselines/reference/modularizeLibrary_TargetES5UsingES6Lib.types
index 25cd47601e0..28ceac3ac91 100644
--- a/tests/baselines/reference/modularizeLibrary_TargetES5UsingES6Lib.types
+++ b/tests/baselines/reference/modularizeLibrary_TargetES5UsingES6Lib.types
@@ -9,9 +9,9 @@ function f(x: number, y: number, z: number) {
 
     return Array.from(arguments);
 >Array.from(arguments) : any[]
->Array.from : { <T, U>(iterable: Iterable<T>, mapfn: (v: T, k: number) => U, thisArg?: any): U[]; <T>(iterable: Iterable<T>): T[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (v: T, k: number) => U, thisArg?: any): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
+>Array.from : { <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(iterable: Iterable<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(iterable: Iterable<T>): T[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(arrayLike: ArrayLike<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
 >Array : ArrayConstructor
->from : { <T, U>(iterable: Iterable<T>, mapfn: (v: T, k: number) => U, thisArg?: any): U[]; <T>(iterable: Iterable<T>): T[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (v: T, k: number) => U, thisArg?: any): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
+>from : { <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(iterable: Iterable<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(iterable: Iterable<T>): T[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(arrayLike: ArrayLike<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
 >arguments : IArguments
 }
 
diff --git a/tests/baselines/reference/modularizeLibrary_TargetES6UsingES6Lib.symbols b/tests/baselines/reference/modularizeLibrary_TargetES6UsingES6Lib.symbols
index d3d3e3d1ed6..568c87d928f 100644
--- a/tests/baselines/reference/modularizeLibrary_TargetES6UsingES6Lib.symbols
+++ b/tests/baselines/reference/modularizeLibrary_TargetES6UsingES6Lib.symbols
@@ -8,9 +8,9 @@ function f(x: number, y: number, z: number) {
 >z : Symbol(z, Decl(modularizeLibrary_TargetES6UsingES6Lib.ts, 2, 32))
 
     return Array.from(arguments);
->Array.from : Symbol(ArrayConstructor.from, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>Array.from : Symbol(ArrayConstructor.from, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
 >Array : Symbol(Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
->from : Symbol(ArrayConstructor.from, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>from : Symbol(ArrayConstructor.from, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
 >arguments : Symbol(arguments)
 }
 
diff --git a/tests/baselines/reference/modularizeLibrary_TargetES6UsingES6Lib.types b/tests/baselines/reference/modularizeLibrary_TargetES6UsingES6Lib.types
index 5b96ce987bc..c1005cadca6 100644
--- a/tests/baselines/reference/modularizeLibrary_TargetES6UsingES6Lib.types
+++ b/tests/baselines/reference/modularizeLibrary_TargetES6UsingES6Lib.types
@@ -9,9 +9,9 @@ function f(x: number, y: number, z: number) {
 
     return Array.from(arguments);
 >Array.from(arguments) : any[]
->Array.from : { <T, U>(iterable: Iterable<T>, mapfn: (v: T, k: number) => U, thisArg?: any): U[]; <T>(iterable: Iterable<T>): T[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (v: T, k: number) => U, thisArg?: any): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
+>Array.from : { <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(iterable: Iterable<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(iterable: Iterable<T>): T[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(arrayLike: ArrayLike<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
 >Array : ArrayConstructor
->from : { <T, U>(iterable: Iterable<T>, mapfn: (v: T, k: number) => U, thisArg?: any): U[]; <T>(iterable: Iterable<T>): T[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (v: T, k: number) => U, thisArg?: any): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
+>from : { <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(iterable: Iterable<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(iterable: Iterable<T>): T[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(arrayLike: ArrayLike<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
 >arguments : IArguments
 }
 
diff --git a/tests/baselines/reference/modularizeLibrary_UsingES5LibAndES6ArrayLib.symbols b/tests/baselines/reference/modularizeLibrary_UsingES5LibAndES6ArrayLib.symbols
index ce03d4cfc59..90a88d4fbaa 100644
--- a/tests/baselines/reference/modularizeLibrary_UsingES5LibAndES6ArrayLib.symbols
+++ b/tests/baselines/reference/modularizeLibrary_UsingES5LibAndES6ArrayLib.symbols
@@ -8,9 +8,9 @@ function f(x: number, y: number, z: number) {
 >z : Symbol(z, Decl(modularizeLibrary_UsingES5LibAndES6ArrayLib.ts, 2, 32))
 
     return Array.from(arguments);
->Array.from : Symbol(ArrayConstructor.from, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>Array.from : Symbol(ArrayConstructor.from, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
 >Array : Symbol(Array, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
->from : Symbol(ArrayConstructor.from, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>from : Symbol(ArrayConstructor.from, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
 >arguments : Symbol(arguments)
 }
 
diff --git a/tests/baselines/reference/modularizeLibrary_UsingES5LibAndES6ArrayLib.types b/tests/baselines/reference/modularizeLibrary_UsingES5LibAndES6ArrayLib.types
index a097b116186..b7ab82ffb7d 100644
--- a/tests/baselines/reference/modularizeLibrary_UsingES5LibAndES6ArrayLib.types
+++ b/tests/baselines/reference/modularizeLibrary_UsingES5LibAndES6ArrayLib.types
@@ -9,9 +9,9 @@ function f(x: number, y: number, z: number) {
 
     return Array.from(arguments);
 >Array.from(arguments) : any[]
->Array.from : { <T, U>(arrayLike: ArrayLike<T>, mapfn: (v: T, k: number) => U, thisArg?: any): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
+>Array.from : { <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(arrayLike: ArrayLike<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
 >Array : ArrayConstructor
->from : { <T, U>(arrayLike: ArrayLike<T>, mapfn: (v: T, k: number) => U, thisArg?: any): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
+>from : { <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(arrayLike: ArrayLike<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
 >arguments : IArguments
 }
 
diff --git a/tests/baselines/reference/modularizeLibrary_UsingES5LibES6ArrayLibES6WellknownSymbolLib.symbols b/tests/baselines/reference/modularizeLibrary_UsingES5LibES6ArrayLibES6WellknownSymbolLib.symbols
index 0ed5ec38513..83ae1ac5f08 100644
--- a/tests/baselines/reference/modularizeLibrary_UsingES5LibES6ArrayLibES6WellknownSymbolLib.symbols
+++ b/tests/baselines/reference/modularizeLibrary_UsingES5LibES6ArrayLibES6WellknownSymbolLib.symbols
@@ -7,9 +7,9 @@ function f(x: number, y: number, z: number) {
 >z : Symbol(z, Decl(modularizeLibrary_UsingES5LibES6ArrayLibES6WellknownSymbolLib.ts, 1, 32))
 
     return Array.from(arguments);
->Array.from : Symbol(ArrayConstructor.from, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>Array.from : Symbol(ArrayConstructor.from, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
 >Array : Symbol(Array, Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
->from : Symbol(ArrayConstructor.from, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>from : Symbol(ArrayConstructor.from, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
 >arguments : Symbol(arguments)
 }
 
diff --git a/tests/baselines/reference/modularizeLibrary_UsingES5LibES6ArrayLibES6WellknownSymbolLib.types b/tests/baselines/reference/modularizeLibrary_UsingES5LibES6ArrayLibES6WellknownSymbolLib.types
index 6accc7e7905..3515b6dc55d 100644
--- a/tests/baselines/reference/modularizeLibrary_UsingES5LibES6ArrayLibES6WellknownSymbolLib.types
+++ b/tests/baselines/reference/modularizeLibrary_UsingES5LibES6ArrayLibES6WellknownSymbolLib.types
@@ -8,9 +8,9 @@ function f(x: number, y: number, z: number) {
 
     return Array.from(arguments);
 >Array.from(arguments) : any[]
->Array.from : { <T, U>(arrayLike: ArrayLike<T>, mapfn: (v: T, k: number) => U, thisArg?: any): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
+>Array.from : { <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(arrayLike: ArrayLike<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
 >Array : ArrayConstructor
->from : { <T, U>(arrayLike: ArrayLike<T>, mapfn: (v: T, k: number) => U, thisArg?: any): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
+>from : { <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(arrayLike: ArrayLike<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
 >arguments : IArguments
 }
 
diff --git a/tests/baselines/reference/nestedSelf.symbols b/tests/baselines/reference/nestedSelf.symbols
index b9a9e91d36d..6fa6bb1b59f 100644
--- a/tests/baselines/reference/nestedSelf.symbols
+++ b/tests/baselines/reference/nestedSelf.symbols
@@ -10,8 +10,8 @@ module M {
 
    public foo() { [1,2,3].map((x) => { return this.n * x; })}
 >foo : Symbol(C.foo, Decl(nestedSelf.ts, 2, 17))
->[1,2,3].map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>[1,2,3].map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >x : Symbol(x, Decl(nestedSelf.ts, 3, 31))
 >this.n : Symbol(C.n, Decl(nestedSelf.ts, 1, 17))
 >this : Symbol(C, Decl(nestedSelf.ts, 0, 10))
diff --git a/tests/baselines/reference/nestedSelf.types b/tests/baselines/reference/nestedSelf.types
index 1ec95a8d24a..176e0dc28d3 100644
--- a/tests/baselines/reference/nestedSelf.types
+++ b/tests/baselines/reference/nestedSelf.types
@@ -12,13 +12,13 @@ module M {
    public foo() { [1,2,3].map((x) => { return this.n * x; })}
 >foo : () => void
 >[1,2,3].map((x) => { return this.n * x; }) : number[]
->[1,2,3].map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
+>[1,2,3].map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
 >[1,2,3] : number[]
 >1 : 1
 >2 : 2
 >3 : 3
->map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
->(x) => { return this.n * x; } : (x: number) => number
+>map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
+>(x) => { return this.n * x; } : (this: undefined, x: number) => number
 >x : number
 >this.n * x : number
 >this.n : number
diff --git a/tests/baselines/reference/noImplicitAnyInContextuallyTypesFunctionParamter.symbols b/tests/baselines/reference/noImplicitAnyInContextuallyTypesFunctionParamter.symbols
index 6cee1604cf0..45b62e29b8a 100644
--- a/tests/baselines/reference/noImplicitAnyInContextuallyTypesFunctionParamter.symbols
+++ b/tests/baselines/reference/noImplicitAnyInContextuallyTypesFunctionParamter.symbols
@@ -4,11 +4,11 @@ var regexMatchList = ['', ''];
 >regexMatchList : Symbol(regexMatchList, Decl(noImplicitAnyInContextuallyTypesFunctionParamter.ts, 1, 3))
 
 regexMatchList.forEach(match => ''.replace(match, ''));
->regexMatchList.forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --))
+>regexMatchList.forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >regexMatchList : Symbol(regexMatchList, Decl(noImplicitAnyInContextuallyTypesFunctionParamter.ts, 1, 3))
->forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --))
+>forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >match : Symbol(match, Decl(noImplicitAnyInContextuallyTypesFunctionParamter.ts, 2, 23))
->''.replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
->replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>''.replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >match : Symbol(match, Decl(noImplicitAnyInContextuallyTypesFunctionParamter.ts, 2, 23))
 
diff --git a/tests/baselines/reference/noImplicitAnyInContextuallyTypesFunctionParamter.types b/tests/baselines/reference/noImplicitAnyInContextuallyTypesFunctionParamter.types
index 928185a0953..100d64482ce 100644
--- a/tests/baselines/reference/noImplicitAnyInContextuallyTypesFunctionParamter.types
+++ b/tests/baselines/reference/noImplicitAnyInContextuallyTypesFunctionParamter.types
@@ -8,15 +8,15 @@ var regexMatchList = ['', ''];
 
 regexMatchList.forEach(match => ''.replace(match, ''));
 >regexMatchList.forEach(match => ''.replace(match, '')) : void
->regexMatchList.forEach : (callbackfn: (value: string, index: number, array: string[]) => void, thisArg?: any) => void
+>regexMatchList.forEach : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void): void; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => void, thisArg: Z): void; }
 >regexMatchList : string[]
->forEach : (callbackfn: (value: string, index: number, array: string[]) => void, thisArg?: any) => void
->match => ''.replace(match, '') : (match: string) => string
+>forEach : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void): void; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => void, thisArg: Z): void; }
+>match => ''.replace(match, '') : (this: undefined, match: string) => string
 >match : string
 >''.replace(match, '') : string
->''.replace : { (searchValue: string, replaceValue: string): string; (searchValue: string, replacer: (substring: string, ...args: any[]) => string): string; (searchValue: RegExp, replaceValue: string): string; (searchValue: RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
+>''.replace : { (searchValue: string | RegExp, replaceValue: string): string; (searchValue: string | RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
 >'' : ""
->replace : { (searchValue: string, replaceValue: string): string; (searchValue: string, replacer: (substring: string, ...args: any[]) => string): string; (searchValue: RegExp, replaceValue: string): string; (searchValue: RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
+>replace : { (searchValue: string | RegExp, replaceValue: string): string; (searchValue: string | RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
 >match : string
 >'' : ""
 
diff --git a/tests/baselines/reference/objectRestForOf.symbols b/tests/baselines/reference/objectRestForOf.symbols
index f3786fed55f..d10b0de4d0e 100644
--- a/tests/baselines/reference/objectRestForOf.symbols
+++ b/tests/baselines/reference/objectRestForOf.symbols
@@ -32,9 +32,9 @@ for ({ x: xx, ...rrestOff } of array ) {
 }
 for (const norest of array.map(a => ({ ...a, x: 'a string' }))) {
 >norest : Symbol(norest, Decl(objectRestForOf.ts, 9, 10))
->array.map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>array.map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
 >array : Symbol(array, Decl(objectRestForOf.ts, 0, 3))
->map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
 >a : Symbol(a, Decl(objectRestForOf.ts, 9, 31))
 >a : Symbol(a, Decl(objectRestForOf.ts, 9, 31))
 >x : Symbol(x, Decl(objectRestForOf.ts, 9, 44))
diff --git a/tests/baselines/reference/objectRestForOf.types b/tests/baselines/reference/objectRestForOf.types
index 2fde7566c74..b7d1d1ac7be 100644
--- a/tests/baselines/reference/objectRestForOf.types
+++ b/tests/baselines/reference/objectRestForOf.types
@@ -36,10 +36,10 @@ for ({ x: xx, ...rrestOff } of array ) {
 for (const norest of array.map(a => ({ ...a, x: 'a string' }))) {
 >norest : { x: string; y: string; }
 >array.map(a => ({ ...a, x: 'a string' })) : { x: string; y: string; }[]
->array.map : { <U>(this: [{ x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }], callbackfn: (value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [{ x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }], callbackfn: (value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [{ x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }], callbackfn: (value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg?: any): [U, U, U]; <U>(this: [{ x: number; y: string; }, { x: number; y: string; }], callbackfn: (value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg?: any): U[]; }
+>array.map : { <U>(this: [{ x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }], callbackfn: (this: undefined, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U): [U, U, U, U, U]; <U>(this: [{ x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }], callbackfn: (this: undefined, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [{ x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }], callbackfn: (this: Z, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [{ x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }], callbackfn: (this: undefined, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U): [U, U, U, U]; <U>(this: [{ x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }], callbackfn: (this: undefined, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [{ x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }], callbackfn: (this: Z, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [{ x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }], callbackfn: (this: undefined, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U): [U, U, U]; <U>(this: [{ x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }], callbackfn: (this: undefined, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [{ x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }], callbackfn: (this: Z, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg: Z): [U, U, U]; <U>(this: [{ x: number; y: string; }, { x: number; y: string; }], callbackfn: (this: undefined, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U): [U, U]; <U>(this: [{ x: number; y: string; }, { x: number; y: string; }], callbackfn: (this: undefined, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [{ x: number; y: string; }, { x: number; y: string; }], callbackfn: (this: Z, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U): U[]; <U>(callbackfn: (this: undefined, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg: Z): U[]; }
 >array : { x: number; y: string; }[]
->map : { <U>(this: [{ x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }], callbackfn: (value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [{ x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }], callbackfn: (value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [{ x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }], callbackfn: (value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg?: any): [U, U, U]; <U>(this: [{ x: number; y: string; }, { x: number; y: string; }], callbackfn: (value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg?: any): U[]; }
->a => ({ ...a, x: 'a string' }) : (a: { x: number; y: string; }) => { x: string; y: string; }
+>map : { <U>(this: [{ x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }], callbackfn: (this: undefined, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U): [U, U, U, U, U]; <U>(this: [{ x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }], callbackfn: (this: undefined, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [{ x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }], callbackfn: (this: Z, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [{ x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }], callbackfn: (this: undefined, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U): [U, U, U, U]; <U>(this: [{ x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }], callbackfn: (this: undefined, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [{ x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }], callbackfn: (this: Z, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [{ x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }], callbackfn: (this: undefined, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U): [U, U, U]; <U>(this: [{ x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }], callbackfn: (this: undefined, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [{ x: number; y: string; }, { x: number; y: string; }, { x: number; y: string; }], callbackfn: (this: Z, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg: Z): [U, U, U]; <U>(this: [{ x: number; y: string; }, { x: number; y: string; }], callbackfn: (this: undefined, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U): [U, U]; <U>(this: [{ x: number; y: string; }, { x: number; y: string; }], callbackfn: (this: undefined, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [{ x: number; y: string; }, { x: number; y: string; }], callbackfn: (this: Z, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U): U[]; <U>(callbackfn: (this: undefined, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: { x: number; y: string; }, index: number, array: { x: number; y: string; }[]) => U, thisArg: Z): U[]; }
+>a => ({ ...a, x: 'a string' }) : (this: undefined, a: { x: number; y: string; }) => { x: string; y: string; }
 >a : { x: number; y: string; }
 >({ ...a, x: 'a string' }) : { x: string; y: string; }
 >{ ...a, x: 'a string' } : { x: string; y: string; }
diff --git a/tests/baselines/reference/overloadResolutionOverNonCTLambdas.symbols b/tests/baselines/reference/overloadResolutionOverNonCTLambdas.symbols
index 02390079e38..0070954bb1e 100644
--- a/tests/baselines/reference/overloadResolutionOverNonCTLambdas.symbols
+++ b/tests/baselines/reference/overloadResolutionOverNonCTLambdas.symbols
@@ -14,9 +14,9 @@ module Bugs {
 
     var result= message.replace(/\{(\d+)\}/g, function(match, ...rest) {
 >result : Symbol(result, Decl(overloadResolutionOverNonCTLambdas.ts, 6, 7))
->message.replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>message.replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >message : Symbol(message, Decl(overloadResolutionOverNonCTLambdas.ts, 5, 16))
->replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >match : Symbol(match, Decl(overloadResolutionOverNonCTLambdas.ts, 6, 55))
 >rest : Symbol(rest, Decl(overloadResolutionOverNonCTLambdas.ts, 6, 61))
 
diff --git a/tests/baselines/reference/overloadResolutionOverNonCTLambdas.types b/tests/baselines/reference/overloadResolutionOverNonCTLambdas.types
index a4de1666d0b..ce2171f1e9a 100644
--- a/tests/baselines/reference/overloadResolutionOverNonCTLambdas.types
+++ b/tests/baselines/reference/overloadResolutionOverNonCTLambdas.types
@@ -15,9 +15,9 @@ module Bugs {
     var result= message.replace(/\{(\d+)\}/g, function(match, ...rest) {
 >result : string
 >message.replace(/\{(\d+)\}/g, function(match, ...rest) {      var index= rest[0];      return typeof args[index] !== 'undefined'        ? args[index]        : match;    }) : string
->message.replace : { (searchValue: string, replaceValue: string): string; (searchValue: string, replacer: (substring: string, ...args: any[]) => string): string; (searchValue: RegExp, replaceValue: string): string; (searchValue: RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
+>message.replace : { (searchValue: string | RegExp, replaceValue: string): string; (searchValue: string | RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
 >message : string
->replace : { (searchValue: string, replaceValue: string): string; (searchValue: string, replacer: (substring: string, ...args: any[]) => string): string; (searchValue: RegExp, replaceValue: string): string; (searchValue: RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
+>replace : { (searchValue: string | RegExp, replaceValue: string): string; (searchValue: string | RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
 >/\{(\d+)\}/g : RegExp
 >function(match, ...rest) {      var index= rest[0];      return typeof args[index] !== 'undefined'        ? args[index]        : match;    } : (match: string, ...rest: any[]) => any
 >match : string
diff --git a/tests/baselines/reference/parser630933.symbols b/tests/baselines/reference/parser630933.symbols
index 0f2ac0679e0..8aff3b01ffd 100644
--- a/tests/baselines/reference/parser630933.symbols
+++ b/tests/baselines/reference/parser630933.symbols
@@ -4,7 +4,7 @@ var a = "Hello";
 
 var b = a.match(/\/ver=([^/]+)/);
 >b : Symbol(b, Decl(parser630933.ts, 1, 3))
->a.match : Symbol(String.match, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>a.match : Symbol(String.match, Decl(lib.d.ts, --, --))
 >a : Symbol(a, Decl(parser630933.ts, 0, 3))
->match : Symbol(String.match, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>match : Symbol(String.match, Decl(lib.d.ts, --, --))
 
diff --git a/tests/baselines/reference/parser630933.types b/tests/baselines/reference/parser630933.types
index 9a0ba9e7205..7b38c188f2d 100644
--- a/tests/baselines/reference/parser630933.types
+++ b/tests/baselines/reference/parser630933.types
@@ -6,8 +6,8 @@ var a = "Hello";
 var b = a.match(/\/ver=([^/]+)/);
 >b : RegExpMatchArray
 >a.match(/\/ver=([^/]+)/) : RegExpMatchArray
->a.match : { (regexp: string): RegExpMatchArray; (regexp: RegExp): RegExpMatchArray; }
+>a.match : (regexp: string | RegExp) => RegExpMatchArray
 >a : string
->match : { (regexp: string): RegExpMatchArray; (regexp: RegExp): RegExpMatchArray; }
+>match : (regexp: string | RegExp) => RegExpMatchArray
 >/\/ver=([^/]+)/ : RegExp
 
diff --git a/tests/baselines/reference/regExpWithSlashInCharClass.symbols b/tests/baselines/reference/regExpWithSlashInCharClass.symbols
index 105724b12f1..6ee33e12b45 100644
--- a/tests/baselines/reference/regExpWithSlashInCharClass.symbols
+++ b/tests/baselines/reference/regExpWithSlashInCharClass.symbols
@@ -1,16 +1,16 @@
 === tests/cases/compiler/regExpWithSlashInCharClass.ts ===
 var foo1 = "a/".replace(/.[/]/, "");
 >foo1 : Symbol(foo1, Decl(regExpWithSlashInCharClass.ts, 0, 3))
->"a/".replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
->replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>"a/".replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 
 var foo2 = "a//".replace(/.[//]/g, "");
 >foo2 : Symbol(foo2, Decl(regExpWithSlashInCharClass.ts, 1, 3))
->"a//".replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
->replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>"a//".replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 
 var foo3 = "a/".replace(/.[/no sleep /till/]/, "bugfix");
 >foo3 : Symbol(foo3, Decl(regExpWithSlashInCharClass.ts, 2, 3))
->"a/".replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
->replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>"a/".replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>replace : Symbol(String.replace, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 
diff --git a/tests/baselines/reference/regExpWithSlashInCharClass.types b/tests/baselines/reference/regExpWithSlashInCharClass.types
index e866f2bc229..1c980ca8d8b 100644
--- a/tests/baselines/reference/regExpWithSlashInCharClass.types
+++ b/tests/baselines/reference/regExpWithSlashInCharClass.types
@@ -2,27 +2,27 @@
 var foo1 = "a/".replace(/.[/]/, "");
 >foo1 : string
 >"a/".replace(/.[/]/, "") : string
->"a/".replace : { (searchValue: string, replaceValue: string): string; (searchValue: string, replacer: (substring: string, ...args: any[]) => string): string; (searchValue: RegExp, replaceValue: string): string; (searchValue: RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
+>"a/".replace : { (searchValue: string | RegExp, replaceValue: string): string; (searchValue: string | RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
 >"a/" : "a/"
->replace : { (searchValue: string, replaceValue: string): string; (searchValue: string, replacer: (substring: string, ...args: any[]) => string): string; (searchValue: RegExp, replaceValue: string): string; (searchValue: RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
+>replace : { (searchValue: string | RegExp, replaceValue: string): string; (searchValue: string | RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
 >/.[/]/ : RegExp
 >"" : ""
 
 var foo2 = "a//".replace(/.[//]/g, "");
 >foo2 : string
 >"a//".replace(/.[//]/g, "") : string
->"a//".replace : { (searchValue: string, replaceValue: string): string; (searchValue: string, replacer: (substring: string, ...args: any[]) => string): string; (searchValue: RegExp, replaceValue: string): string; (searchValue: RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
+>"a//".replace : { (searchValue: string | RegExp, replaceValue: string): string; (searchValue: string | RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
 >"a//" : "a//"
->replace : { (searchValue: string, replaceValue: string): string; (searchValue: string, replacer: (substring: string, ...args: any[]) => string): string; (searchValue: RegExp, replaceValue: string): string; (searchValue: RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
+>replace : { (searchValue: string | RegExp, replaceValue: string): string; (searchValue: string | RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
 >/.[//]/g : RegExp
 >"" : ""
 
 var foo3 = "a/".replace(/.[/no sleep /till/]/, "bugfix");
 >foo3 : string
 >"a/".replace(/.[/no sleep /till/]/, "bugfix") : string
->"a/".replace : { (searchValue: string, replaceValue: string): string; (searchValue: string, replacer: (substring: string, ...args: any[]) => string): string; (searchValue: RegExp, replaceValue: string): string; (searchValue: RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
+>"a/".replace : { (searchValue: string | RegExp, replaceValue: string): string; (searchValue: string | RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
 >"a/" : "a/"
->replace : { (searchValue: string, replaceValue: string): string; (searchValue: string, replacer: (substring: string, ...args: any[]) => string): string; (searchValue: RegExp, replaceValue: string): string; (searchValue: RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
+>replace : { (searchValue: string | RegExp, replaceValue: string): string; (searchValue: string | RegExp, replacer: (substring: string, ...args: any[]) => string): string; }
 >/.[/no sleep /till/]/ : RegExp
 >"bugfix" : "bugfix"
 
diff --git a/tests/baselines/reference/simpleArrowFunctionParameterReferencedInObjectLiteral1.symbols b/tests/baselines/reference/simpleArrowFunctionParameterReferencedInObjectLiteral1.symbols
index 23a1df25653..edb2c362fc2 100644
--- a/tests/baselines/reference/simpleArrowFunctionParameterReferencedInObjectLiteral1.symbols
+++ b/tests/baselines/reference/simpleArrowFunctionParameterReferencedInObjectLiteral1.symbols
@@ -1,9 +1,9 @@
 === tests/cases/compiler/simpleArrowFunctionParameterReferencedInObjectLiteral1.ts ===
 [].map(() => [].map(p => ({ X: p })));
->[].map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
->[].map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>[].map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>[].map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >p : Symbol(p, Decl(simpleArrowFunctionParameterReferencedInObjectLiteral1.ts, 0, 20))
 >X : Symbol(X, Decl(simpleArrowFunctionParameterReferencedInObjectLiteral1.ts, 0, 27))
 >p : Symbol(p, Decl(simpleArrowFunctionParameterReferencedInObjectLiteral1.ts, 0, 20))
diff --git a/tests/baselines/reference/simpleArrowFunctionParameterReferencedInObjectLiteral1.types b/tests/baselines/reference/simpleArrowFunctionParameterReferencedInObjectLiteral1.types
index ff1640909d9..ad683ef2e15 100644
--- a/tests/baselines/reference/simpleArrowFunctionParameterReferencedInObjectLiteral1.types
+++ b/tests/baselines/reference/simpleArrowFunctionParameterReferencedInObjectLiteral1.types
@@ -1,15 +1,15 @@
 === tests/cases/compiler/simpleArrowFunctionParameterReferencedInObjectLiteral1.ts ===
 [].map(() => [].map(p => ({ X: p })));
 >[].map(() => [].map(p => ({ X: p }))) : { X: any; }[][]
->[].map : { <U>(this: [any, any, any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U]; <U>(this: [any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): U[]; }
+>[].map : { <U>(this: [any, any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U, U, U]; <U>(this: [any, any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [any, any, any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [any, any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U]; <U>(this: [any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U]; <U>(this: [any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U]; <U>(this: [any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): U[]; <U>(callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): U[]; }
 >[] : undefined[]
->map : { <U>(this: [any, any, any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U]; <U>(this: [any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): U[]; }
+>map : { <U>(this: [any, any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U, U, U]; <U>(this: [any, any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [any, any, any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [any, any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U]; <U>(this: [any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U]; <U>(this: [any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U]; <U>(this: [any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): U[]; <U>(callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): U[]; }
 >() => [].map(p => ({ X: p })) : () => { X: any; }[]
 >[].map(p => ({ X: p })) : { X: any; }[]
->[].map : { <U>(this: [any, any, any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U]; <U>(this: [any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): U[]; }
+>[].map : { <U>(this: [any, any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U, U, U]; <U>(this: [any, any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [any, any, any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [any, any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U]; <U>(this: [any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U]; <U>(this: [any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U]; <U>(this: [any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): U[]; <U>(callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): U[]; }
 >[] : undefined[]
->map : { <U>(this: [any, any, any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [any, any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U, U]; <U>(this: [any, any], callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: any, index: number, array: any[]) => U, thisArg?: any): U[]; }
->p => ({ X: p }) : (p: any) => { X: any; }
+>map : { <U>(this: [any, any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U, U, U]; <U>(this: [any, any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [any, any, any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U, U]; <U>(this: [any, any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [any, any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U, U]; <U>(this: [any, any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [any, any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U, U]; <U>(this: [any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): [U, U]; <U>(this: [any, any], callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [any, any], callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: any, index: number, array: any[]) => U): U[]; <U>(callbackfn: (this: undefined, value: any, index: number, array: any[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: any, index: number, array: any[]) => U, thisArg: Z): U[]; }
+>p => ({ X: p }) : (this: undefined, p: any) => { X: any; }
 >p : any
 >({ X: p }) : { X: any; }
 >{ X: p } : { X: any; }
diff --git a/tests/baselines/reference/specializationsShouldNotAffectEachOther.symbols b/tests/baselines/reference/specializationsShouldNotAffectEachOther.symbols
index 7d5a6d979b3..8c8b372bbc8 100644
--- a/tests/baselines/reference/specializationsShouldNotAffectEachOther.symbols
+++ b/tests/baselines/reference/specializationsShouldNotAffectEachOther.symbols
@@ -23,9 +23,9 @@ function foo() {
 >series2 : Symbol(series2, Decl(specializationsShouldNotAffectEachOther.ts, 12, 7))
 
     series2.map(seriesExtent);
->series2.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>series2.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >series2 : Symbol(series2, Decl(specializationsShouldNotAffectEachOther.ts, 12, 7))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >seriesExtent : Symbol(seriesExtent, Decl(specializationsShouldNotAffectEachOther.ts, 10, 7))
 
     return null;
@@ -34,11 +34,11 @@ function foo() {
 
 var keyExtent2: any[] = series.data.map(function (d: string) { return d; });
 >keyExtent2 : Symbol(keyExtent2, Decl(specializationsShouldNotAffectEachOther.ts, 19, 3))
->series.data.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>series.data.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >series.data : Symbol(Series.data, Decl(specializationsShouldNotAffectEachOther.ts, 1, 19))
 >series : Symbol(series, Decl(specializationsShouldNotAffectEachOther.ts, 5, 3))
 >data : Symbol(Series.data, Decl(specializationsShouldNotAffectEachOther.ts, 1, 19))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >d : Symbol(d, Decl(specializationsShouldNotAffectEachOther.ts, 19, 50))
 >d : Symbol(d, Decl(specializationsShouldNotAffectEachOther.ts, 19, 50))
 
diff --git a/tests/baselines/reference/specializationsShouldNotAffectEachOther.types b/tests/baselines/reference/specializationsShouldNotAffectEachOther.types
index aa14eca0508..d9c9b7baa20 100644
--- a/tests/baselines/reference/specializationsShouldNotAffectEachOther.types
+++ b/tests/baselines/reference/specializationsShouldNotAffectEachOther.types
@@ -26,9 +26,9 @@ function foo() {
 
     series2.map(seriesExtent);
 >series2.map(seriesExtent) : any[]
->series2.map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
+>series2.map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
 >series2 : number[]
->map : { <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U]; <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[]; }
+>map : { <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U]; <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U]; <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U]; <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U]; <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[]; <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[]; }
 >seriesExtent : (series: any) => any
 
     return null;
@@ -39,12 +39,12 @@ function foo() {
 var keyExtent2: any[] = series.data.map(function (d: string) { return d; });
 >keyExtent2 : any[]
 >series.data.map(function (d: string) { return d; }) : string[]
->series.data.map : { <U>(this: [string, string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U]; <U>(this: [string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): U[]; }
+>series.data.map : { <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U, U]; <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [string, string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): U[]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): U[]; }
 >series.data : string[]
 >series : Series
 >data : string[]
->map : { <U>(this: [string, string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U]; <U>(this: [string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): U[]; }
->function (d: string) { return d; } : (d: string) => string
+>map : { <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U, U]; <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [string, string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): U[]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): U[]; }
+>function (d: string) { return d; } : (this: undefined, d: string) => string
 >d : string
 >d : string
 
diff --git a/tests/baselines/reference/targetTypeArgs.symbols b/tests/baselines/reference/targetTypeArgs.symbols
index b0d825ddd50..d7c40a6a609 100644
--- a/tests/baselines/reference/targetTypeArgs.symbols
+++ b/tests/baselines/reference/targetTypeArgs.symbols
@@ -14,44 +14,44 @@ foo(function(x) { x });
 >x : Symbol(x, Decl(targetTypeArgs.ts, 4, 13))
 
 [1].forEach(function(v,i,a) { v });
->[1].forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --))
->forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --))
+>[1].forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >v : Symbol(v, Decl(targetTypeArgs.ts, 6, 21))
 >i : Symbol(i, Decl(targetTypeArgs.ts, 6, 23))
 >a : Symbol(a, Decl(targetTypeArgs.ts, 6, 25))
 >v : Symbol(v, Decl(targetTypeArgs.ts, 6, 21))
 
 ["hello"].every(function(v,i,a) {return true;});
->["hello"].every : Symbol(Array.every, Decl(lib.d.ts, --, --))
->every : Symbol(Array.every, Decl(lib.d.ts, --, --))
+>["hello"].every : Symbol(Array.every, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>every : Symbol(Array.every, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >v : Symbol(v, Decl(targetTypeArgs.ts, 7, 25))
 >i : Symbol(i, Decl(targetTypeArgs.ts, 7, 27))
 >a : Symbol(a, Decl(targetTypeArgs.ts, 7, 29))
 
 [1].every(function(v,i,a) {return true;});
->[1].every : Symbol(Array.every, Decl(lib.d.ts, --, --))
->every : Symbol(Array.every, Decl(lib.d.ts, --, --))
+>[1].every : Symbol(Array.every, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>every : Symbol(Array.every, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >v : Symbol(v, Decl(targetTypeArgs.ts, 8, 19))
 >i : Symbol(i, Decl(targetTypeArgs.ts, 8, 21))
 >a : Symbol(a, Decl(targetTypeArgs.ts, 8, 23))
 
 [1].every(function(v,i,a) {return true;});
->[1].every : Symbol(Array.every, Decl(lib.d.ts, --, --))
->every : Symbol(Array.every, Decl(lib.d.ts, --, --))
+>[1].every : Symbol(Array.every, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>every : Symbol(Array.every, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >v : Symbol(v, Decl(targetTypeArgs.ts, 9, 19))
 >i : Symbol(i, Decl(targetTypeArgs.ts, 9, 21))
 >a : Symbol(a, Decl(targetTypeArgs.ts, 9, 23))
 
 ["s"].every(function(v,i,a) {return true;});
->["s"].every : Symbol(Array.every, Decl(lib.d.ts, --, --))
->every : Symbol(Array.every, Decl(lib.d.ts, --, --))
+>["s"].every : Symbol(Array.every, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>every : Symbol(Array.every, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >v : Symbol(v, Decl(targetTypeArgs.ts, 10, 21))
 >i : Symbol(i, Decl(targetTypeArgs.ts, 10, 23))
 >a : Symbol(a, Decl(targetTypeArgs.ts, 10, 25))
 
 ["s"].forEach(function(v,i,a) { v });
->["s"].forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --))
->forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --))
+>["s"].forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >v : Symbol(v, Decl(targetTypeArgs.ts, 11, 23))
 >i : Symbol(i, Decl(targetTypeArgs.ts, 11, 25))
 >a : Symbol(a, Decl(targetTypeArgs.ts, 11, 27))
diff --git a/tests/baselines/reference/targetTypeArgs.types b/tests/baselines/reference/targetTypeArgs.types
index 84985316aa2..e1bcb00ba15 100644
--- a/tests/baselines/reference/targetTypeArgs.types
+++ b/tests/baselines/reference/targetTypeArgs.types
@@ -19,11 +19,11 @@ foo(function(x) { x });
 
 [1].forEach(function(v,i,a) { v });
 >[1].forEach(function(v,i,a) { v }) : void
->[1].forEach : (callbackfn: (value: number, index: number, array: number[]) => void, thisArg?: any) => void
+>[1].forEach : { (callbackfn: (this: undefined, value: number, index: number, array: number[]) => void): void; (callbackfn: (this: undefined, value: number, index: number, array: number[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: number, index: number, array: number[]) => void, thisArg: Z): void; }
 >[1] : number[]
 >1 : 1
->forEach : (callbackfn: (value: number, index: number, array: number[]) => void, thisArg?: any) => void
->function(v,i,a) { v } : (v: number, i: number, a: number[]) => void
+>forEach : { (callbackfn: (this: undefined, value: number, index: number, array: number[]) => void): void; (callbackfn: (this: undefined, value: number, index: number, array: number[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: number, index: number, array: number[]) => void, thisArg: Z): void; }
+>function(v,i,a) { v } : (this: undefined, v: number, i: number, a: number[]) => void
 >v : number
 >i : number
 >a : number[]
@@ -31,11 +31,11 @@ foo(function(x) { x });
 
 ["hello"].every(function(v,i,a) {return true;});
 >["hello"].every(function(v,i,a) {return true;}) : boolean
->["hello"].every : (callbackfn: (value: string, index: number, array: string[]) => boolean, thisArg?: any) => boolean
+>["hello"].every : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => boolean): boolean; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => boolean, thisArg: Z): boolean; }
 >["hello"] : string[]
 >"hello" : "hello"
->every : (callbackfn: (value: string, index: number, array: string[]) => boolean, thisArg?: any) => boolean
->function(v,i,a) {return true;} : (v: string, i: number, a: string[]) => true
+>every : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => boolean): boolean; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => boolean, thisArg: Z): boolean; }
+>function(v,i,a) {return true;} : (this: undefined, v: string, i: number, a: string[]) => true
 >v : string
 >i : number
 >a : string[]
@@ -43,11 +43,11 @@ foo(function(x) { x });
 
 [1].every(function(v,i,a) {return true;});
 >[1].every(function(v,i,a) {return true;}) : boolean
->[1].every : (callbackfn: (value: number, index: number, array: number[]) => boolean, thisArg?: any) => boolean
+>[1].every : { (callbackfn: (this: undefined, value: number, index: number, array: number[]) => boolean): boolean; (callbackfn: (this: undefined, value: number, index: number, array: number[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: number, index: number, array: number[]) => boolean, thisArg: Z): boolean; }
 >[1] : number[]
 >1 : 1
->every : (callbackfn: (value: number, index: number, array: number[]) => boolean, thisArg?: any) => boolean
->function(v,i,a) {return true;} : (v: number, i: number, a: number[]) => true
+>every : { (callbackfn: (this: undefined, value: number, index: number, array: number[]) => boolean): boolean; (callbackfn: (this: undefined, value: number, index: number, array: number[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: number, index: number, array: number[]) => boolean, thisArg: Z): boolean; }
+>function(v,i,a) {return true;} : (this: undefined, v: number, i: number, a: number[]) => true
 >v : number
 >i : number
 >a : number[]
@@ -55,11 +55,11 @@ foo(function(x) { x });
 
 [1].every(function(v,i,a) {return true;});
 >[1].every(function(v,i,a) {return true;}) : boolean
->[1].every : (callbackfn: (value: number, index: number, array: number[]) => boolean, thisArg?: any) => boolean
+>[1].every : { (callbackfn: (this: undefined, value: number, index: number, array: number[]) => boolean): boolean; (callbackfn: (this: undefined, value: number, index: number, array: number[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: number, index: number, array: number[]) => boolean, thisArg: Z): boolean; }
 >[1] : number[]
 >1 : 1
->every : (callbackfn: (value: number, index: number, array: number[]) => boolean, thisArg?: any) => boolean
->function(v,i,a) {return true;} : (v: number, i: number, a: number[]) => true
+>every : { (callbackfn: (this: undefined, value: number, index: number, array: number[]) => boolean): boolean; (callbackfn: (this: undefined, value: number, index: number, array: number[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: number, index: number, array: number[]) => boolean, thisArg: Z): boolean; }
+>function(v,i,a) {return true;} : (this: undefined, v: number, i: number, a: number[]) => true
 >v : number
 >i : number
 >a : number[]
@@ -67,11 +67,11 @@ foo(function(x) { x });
 
 ["s"].every(function(v,i,a) {return true;});
 >["s"].every(function(v,i,a) {return true;}) : boolean
->["s"].every : (callbackfn: (value: string, index: number, array: string[]) => boolean, thisArg?: any) => boolean
+>["s"].every : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => boolean): boolean; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => boolean, thisArg: Z): boolean; }
 >["s"] : string[]
 >"s" : "s"
->every : (callbackfn: (value: string, index: number, array: string[]) => boolean, thisArg?: any) => boolean
->function(v,i,a) {return true;} : (v: string, i: number, a: string[]) => true
+>every : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => boolean): boolean; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => boolean, thisArg: Z): boolean; }
+>function(v,i,a) {return true;} : (this: undefined, v: string, i: number, a: string[]) => true
 >v : string
 >i : number
 >a : string[]
@@ -79,11 +79,11 @@ foo(function(x) { x });
 
 ["s"].forEach(function(v,i,a) { v });
 >["s"].forEach(function(v,i,a) { v }) : void
->["s"].forEach : (callbackfn: (value: string, index: number, array: string[]) => void, thisArg?: any) => void
+>["s"].forEach : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void): void; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => void, thisArg: Z): void; }
 >["s"] : string[]
 >"s" : "s"
->forEach : (callbackfn: (value: string, index: number, array: string[]) => void, thisArg?: any) => void
->function(v,i,a) { v } : (v: string, i: number, a: string[]) => void
+>forEach : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void): void; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => void, thisArg: Z): void; }
+>function(v,i,a) { v } : (this: undefined, v: string, i: number, a: string[]) => void
 >v : string
 >i : number
 >a : string[]
diff --git a/tests/baselines/reference/targetTypeObjectLiteralToAny.symbols b/tests/baselines/reference/targetTypeObjectLiteralToAny.symbols
index 6df8d8ac2ad..d7903e3328a 100644
--- a/tests/baselines/reference/targetTypeObjectLiteralToAny.symbols
+++ b/tests/baselines/reference/targetTypeObjectLiteralToAny.symbols
@@ -9,9 +9,9 @@ function suggest(){
 >result : Symbol(result, Decl(targetTypeObjectLiteralToAny.ts, 2, 4))
 					
 	TypeScriptKeywords.forEach(function(keyword) {						
->TypeScriptKeywords.forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --))
+>TypeScriptKeywords.forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >TypeScriptKeywords : Symbol(TypeScriptKeywords, Decl(targetTypeObjectLiteralToAny.ts, 1, 4))
->forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --))
+>forEach : Symbol(Array.forEach, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >keyword : Symbol(keyword, Decl(targetTypeObjectLiteralToAny.ts, 4, 37))
 
 		result.push({text:keyword, type:"keyword"}); // this should not cause a crash - push should be typed to any
diff --git a/tests/baselines/reference/targetTypeObjectLiteralToAny.types b/tests/baselines/reference/targetTypeObjectLiteralToAny.types
index 1dd81b33603..1364a5b2a23 100644
--- a/tests/baselines/reference/targetTypeObjectLiteralToAny.types
+++ b/tests/baselines/reference/targetTypeObjectLiteralToAny.types
@@ -10,10 +10,10 @@ function suggest(){
 					
 	TypeScriptKeywords.forEach(function(keyword) {						
 >TypeScriptKeywords.forEach(function(keyword) {								result.push({text:keyword, type:"keyword"}); // this should not cause a crash - push should be typed to any	}) : void
->TypeScriptKeywords.forEach : (callbackfn: (value: string, index: number, array: string[]) => void, thisArg?: any) => void
+>TypeScriptKeywords.forEach : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void): void; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => void, thisArg: Z): void; }
 >TypeScriptKeywords : string[]
->forEach : (callbackfn: (value: string, index: number, array: string[]) => void, thisArg?: any) => void
->function(keyword) {								result.push({text:keyword, type:"keyword"}); // this should not cause a crash - push should be typed to any	} : (keyword: string) => void
+>forEach : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void): void; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => void, thisArg: Z): void; }
+>function(keyword) {								result.push({text:keyword, type:"keyword"}); // this should not cause a crash - push should be typed to any	} : (this: undefined, keyword: string) => void
 >keyword : string
 
 		result.push({text:keyword, type:"keyword"}); // this should not cause a crash - push should be typed to any
diff --git a/tests/baselines/reference/textChanges/deleteNode1.js b/tests/baselines/reference/textChanges/deleteNode1.js
new file mode 100644
index 00000000000..c73c0eaf9f9
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNode1.js
@@ -0,0 +1,13 @@
+===ORIGINAL===
+
+var x = 1; // some comment - 1
+/**
+ * comment 2
+ */
+var y = 2; // comment 3
+var z = 3; // comment 4
+
+===MODIFIED===
+
+var x = 1; // some comment - 1
+var z = 3; // comment 4
diff --git a/tests/baselines/reference/textChanges/deleteNode2.js b/tests/baselines/reference/textChanges/deleteNode2.js
new file mode 100644
index 00000000000..828a9b5b8fa
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNode2.js
@@ -0,0 +1,12 @@
+===ORIGINAL===
+
+var x = 1; // some comment - 1
+/**
+ * comment 2
+ */
+var y = 2; // comment 3
+var z = 3; // comment 4
+
+===MODIFIED===
+
+var x = 1;var z = 3; // comment 4
diff --git a/tests/baselines/reference/textChanges/deleteNode3.js b/tests/baselines/reference/textChanges/deleteNode3.js
new file mode 100644
index 00000000000..acb26c7daa7
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNode3.js
@@ -0,0 +1,14 @@
+===ORIGINAL===
+
+var x = 1; // some comment - 1
+/**
+ * comment 2
+ */
+var y = 2; // comment 3
+var z = 3; // comment 4
+
+===MODIFIED===
+
+var x = 1; // some comment - 1
+ // comment 3
+var z = 3; // comment 4
diff --git a/tests/baselines/reference/textChanges/deleteNode4.js b/tests/baselines/reference/textChanges/deleteNode4.js
new file mode 100644
index 00000000000..b6edb25bc5c
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNode4.js
@@ -0,0 +1,13 @@
+===ORIGINAL===
+
+var x = 1; // some comment - 1
+/**
+ * comment 2
+ */
+var y = 2; // comment 3
+var z = 3; // comment 4
+
+===MODIFIED===
+
+var x = 1; // comment 3
+var z = 3; // comment 4
diff --git a/tests/baselines/reference/textChanges/deleteNode5.js b/tests/baselines/reference/textChanges/deleteNode5.js
new file mode 100644
index 00000000000..6f896535f0f
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNode5.js
@@ -0,0 +1,16 @@
+===ORIGINAL===
+
+var x = 1; // some comment - 1
+/**
+ * comment 2
+ */
+var y = 2; // comment 3
+var z = 3; // comment 4
+
+===MODIFIED===
+
+/**
+ * comment 2
+ */
+var y = 2; // comment 3
+var z = 3; // comment 4
diff --git a/tests/baselines/reference/textChanges/deleteNodeAfterInClass1.js b/tests/baselines/reference/textChanges/deleteNodeAfterInClass1.js
new file mode 100644
index 00000000000..d8d54153eaa
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeAfterInClass1.js
@@ -0,0 +1,12 @@
+===ORIGINAL===
+
+class A {
+    x;
+    y = 1;
+}
+
+===MODIFIED===
+
+class A {
+    y = 1;
+}
diff --git a/tests/baselines/reference/textChanges/deleteNodeAfterInClass2.js b/tests/baselines/reference/textChanges/deleteNodeAfterInClass2.js
new file mode 100644
index 00000000000..8d18d820214
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeAfterInClass2.js
@@ -0,0 +1,12 @@
+===ORIGINAL===
+
+class A {
+    x
+    y = 1;
+}
+
+===MODIFIED===
+
+class A {
+    y = 1;
+}
diff --git a/tests/baselines/reference/textChanges/deleteNodeInList1.js b/tests/baselines/reference/textChanges/deleteNodeInList1.js
new file mode 100644
index 00000000000..b603913566d
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeInList1.js
@@ -0,0 +1,4 @@
+===ORIGINAL===
+var a = 1, b = 2, c = 3;
+===MODIFIED===
+var b = 2, c = 3;
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/deleteNodeInList10.js b/tests/baselines/reference/textChanges/deleteNodeInList10.js
new file mode 100644
index 00000000000..46da605a71a
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeInList10.js
@@ -0,0 +1,10 @@
+===ORIGINAL===
+
+function foo(a: number,b: string,c = true) {
+    return 1;
+}
+===MODIFIED===
+
+function foo(b: string,c = true) {
+    return 1;
+}
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/deleteNodeInList11.js b/tests/baselines/reference/textChanges/deleteNodeInList11.js
new file mode 100644
index 00000000000..f5aa666e527
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeInList11.js
@@ -0,0 +1,10 @@
+===ORIGINAL===
+
+function foo(a: number,b: string,c = true) {
+    return 1;
+}
+===MODIFIED===
+
+function foo(a: number,c = true) {
+    return 1;
+}
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/deleteNodeInList12.js b/tests/baselines/reference/textChanges/deleteNodeInList12.js
new file mode 100644
index 00000000000..db05ef06db9
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeInList12.js
@@ -0,0 +1,10 @@
+===ORIGINAL===
+
+function foo(a: number,b: string,c = true) {
+    return 1;
+}
+===MODIFIED===
+
+function foo(a: number,b: string) {
+    return 1;
+}
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/deleteNodeInList13.js b/tests/baselines/reference/textChanges/deleteNodeInList13.js
new file mode 100644
index 00000000000..599d3a31d43
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeInList13.js
@@ -0,0 +1,15 @@
+===ORIGINAL===
+
+function foo(
+    a: number,
+    b: string,
+    c = true) {
+    return 1;
+}
+===MODIFIED===
+
+function foo(
+    b: string,
+    c = true) {
+    return 1;
+}
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/deleteNodeInList14.js b/tests/baselines/reference/textChanges/deleteNodeInList14.js
new file mode 100644
index 00000000000..da3596b38b2
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeInList14.js
@@ -0,0 +1,15 @@
+===ORIGINAL===
+
+function foo(
+    a: number,
+    b: string,
+    c = true) {
+    return 1;
+}
+===MODIFIED===
+
+function foo(
+    a: number,
+    c = true) {
+    return 1;
+}
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/deleteNodeInList15.js b/tests/baselines/reference/textChanges/deleteNodeInList15.js
new file mode 100644
index 00000000000..02f649dabd2
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeInList15.js
@@ -0,0 +1,15 @@
+===ORIGINAL===
+
+function foo(
+    a: number,
+    b: string,
+    c = true) {
+    return 1;
+}
+===MODIFIED===
+
+function foo(
+    a: number,
+    b: string) {
+    return 1;
+}
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/deleteNodeInList1_1.js b/tests/baselines/reference/textChanges/deleteNodeInList1_1.js
new file mode 100644
index 00000000000..87709601c42
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeInList1_1.js
@@ -0,0 +1,4 @@
+===ORIGINAL===
+var a = 1,b = 2,c = 3;
+===MODIFIED===
+var b = 2,c = 3;
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/deleteNodeInList2.js b/tests/baselines/reference/textChanges/deleteNodeInList2.js
new file mode 100644
index 00000000000..18e4a0cd304
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeInList2.js
@@ -0,0 +1,4 @@
+===ORIGINAL===
+var a = 1, b = 2, c = 3;
+===MODIFIED===
+var a = 1, c = 3;
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/deleteNodeInList2_1.js b/tests/baselines/reference/textChanges/deleteNodeInList2_1.js
new file mode 100644
index 00000000000..b4098a89302
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeInList2_1.js
@@ -0,0 +1,4 @@
+===ORIGINAL===
+var a = 1,b = 2,c = 3;
+===MODIFIED===
+var a = 1,c = 3;
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/deleteNodeInList3.js b/tests/baselines/reference/textChanges/deleteNodeInList3.js
new file mode 100644
index 00000000000..1c6ff4aa294
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeInList3.js
@@ -0,0 +1,4 @@
+===ORIGINAL===
+var a = 1, b = 2, c = 3;
+===MODIFIED===
+var a = 1, b = 2;
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/deleteNodeInList3_1.js b/tests/baselines/reference/textChanges/deleteNodeInList3_1.js
new file mode 100644
index 00000000000..ead2a1a42f8
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeInList3_1.js
@@ -0,0 +1,4 @@
+===ORIGINAL===
+var a = 1,b = 2,c = 3;
+===MODIFIED===
+var a = 1,b = 2;
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/deleteNodeInList4.js b/tests/baselines/reference/textChanges/deleteNodeInList4.js
new file mode 100644
index 00000000000..61bdf9159cb
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeInList4.js
@@ -0,0 +1,13 @@
+===ORIGINAL===
+
+namespace M {
+    var a = 1,
+        b = 2,
+        c = 3;
+}
+===MODIFIED===
+
+namespace M {
+    var b = 2,
+        c = 3;
+}
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/deleteNodeInList4_1.js b/tests/baselines/reference/textChanges/deleteNodeInList4_1.js
new file mode 100644
index 00000000000..19ff5475d1a
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeInList4_1.js
@@ -0,0 +1,17 @@
+===ORIGINAL===
+
+namespace M {
+    var a = 1, // comment 1
+        // comment 2
+        b = 2, // comment 3
+        // comment 4
+        c = 3; // comment 5
+}
+===MODIFIED===
+
+namespace M {
+    var // comment 2
+        b = 2, // comment 3
+        // comment 4
+        c = 3; // comment 5
+}
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/deleteNodeInList5.js b/tests/baselines/reference/textChanges/deleteNodeInList5.js
new file mode 100644
index 00000000000..0ed65877d27
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeInList5.js
@@ -0,0 +1,13 @@
+===ORIGINAL===
+
+namespace M {
+    var a = 1,
+        b = 2,
+        c = 3;
+}
+===MODIFIED===
+
+namespace M {
+    var a = 1,
+        c = 3;
+}
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/deleteNodeInList5_1.js b/tests/baselines/reference/textChanges/deleteNodeInList5_1.js
new file mode 100644
index 00000000000..224b92481d3
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeInList5_1.js
@@ -0,0 +1,16 @@
+===ORIGINAL===
+
+namespace M {
+    var a = 1, // comment 1
+        // comment 2
+        b = 2, // comment 3
+        // comment 4
+        c = 3; // comment 5
+}
+===MODIFIED===
+
+namespace M {
+    var a = 1, // comment 1
+        // comment 4
+        c = 3; // comment 5
+}
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/deleteNodeInList6.js b/tests/baselines/reference/textChanges/deleteNodeInList6.js
new file mode 100644
index 00000000000..4093329023f
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeInList6.js
@@ -0,0 +1,13 @@
+===ORIGINAL===
+
+namespace M {
+    var a = 1,
+        b = 2,
+        c = 3;
+}
+===MODIFIED===
+
+namespace M {
+    var a = 1,
+        b = 2;
+}
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/deleteNodeInList6_1.js b/tests/baselines/reference/textChanges/deleteNodeInList6_1.js
new file mode 100644
index 00000000000..6acc20aa826
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeInList6_1.js
@@ -0,0 +1,16 @@
+===ORIGINAL===
+
+namespace M {
+    var a = 1, // comment 1
+        // comment 2
+        b = 2, // comment 3
+        // comment 4
+        c = 3; // comment 5
+}
+===MODIFIED===
+
+namespace M {
+    var a = 1, // comment 1
+        // comment 2
+        b = 2; // comment 5
+}
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/deleteNodeInList7.js b/tests/baselines/reference/textChanges/deleteNodeInList7.js
new file mode 100644
index 00000000000..564ff3f86aa
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeInList7.js
@@ -0,0 +1,10 @@
+===ORIGINAL===
+
+function foo(a: number, b: string, c = true) {
+    return 1;
+}
+===MODIFIED===
+
+function foo(b: string, c = true) {
+    return 1;
+}
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/deleteNodeInList8.js b/tests/baselines/reference/textChanges/deleteNodeInList8.js
new file mode 100644
index 00000000000..b3a0a0f4c47
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeInList8.js
@@ -0,0 +1,10 @@
+===ORIGINAL===
+
+function foo(a: number, b: string, c = true) {
+    return 1;
+}
+===MODIFIED===
+
+function foo(a: number, c = true) {
+    return 1;
+}
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/deleteNodeInList9.js b/tests/baselines/reference/textChanges/deleteNodeInList9.js
new file mode 100644
index 00000000000..96878a6086d
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeInList9.js
@@ -0,0 +1,10 @@
+===ORIGINAL===
+
+function foo(a: number, b: string, c = true) {
+    return 1;
+}
+===MODIFIED===
+
+function foo(a: number, b: string) {
+    return 1;
+}
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/deleteNodeRange1.js b/tests/baselines/reference/textChanges/deleteNodeRange1.js
new file mode 100644
index 00000000000..f9fa45ebb1a
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeRange1.js
@@ -0,0 +1,16 @@
+===ORIGINAL===
+
+// comment 1
+var x = 1; // comment 2
+// comment 3
+var y = 2; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
+
+===MODIFIED===
+
+// comment 1
+var x = 1; // comment 2
+// comment 6
+var a = 4; // comment 7
diff --git a/tests/baselines/reference/textChanges/deleteNodeRange2.js b/tests/baselines/reference/textChanges/deleteNodeRange2.js
new file mode 100644
index 00000000000..aacea6ff5ee
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeRange2.js
@@ -0,0 +1,15 @@
+===ORIGINAL===
+
+// comment 1
+var x = 1; // comment 2
+// comment 3
+var y = 2; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
+
+===MODIFIED===
+
+// comment 1
+var x = 1;// comment 6
+var a = 4; // comment 7
diff --git a/tests/baselines/reference/textChanges/deleteNodeRange3.js b/tests/baselines/reference/textChanges/deleteNodeRange3.js
new file mode 100644
index 00000000000..bb2bb36ca2c
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeRange3.js
@@ -0,0 +1,17 @@
+===ORIGINAL===
+
+// comment 1
+var x = 1; // comment 2
+// comment 3
+var y = 2; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
+
+===MODIFIED===
+
+// comment 1
+var x = 1; // comment 2
+ // comment 5
+// comment 6
+var a = 4; // comment 7
diff --git a/tests/baselines/reference/textChanges/deleteNodeRange4.js b/tests/baselines/reference/textChanges/deleteNodeRange4.js
new file mode 100644
index 00000000000..3e9ad960b13
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteNodeRange4.js
@@ -0,0 +1,16 @@
+===ORIGINAL===
+
+// comment 1
+var x = 1; // comment 2
+// comment 3
+var y = 2; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
+
+===MODIFIED===
+
+// comment 1
+var x = 1; // comment 5
+// comment 6
+var a = 4; // comment 7
diff --git a/tests/baselines/reference/textChanges/deleteRange1.js b/tests/baselines/reference/textChanges/deleteRange1.js
new file mode 100644
index 00000000000..362e678452e
--- /dev/null
+++ b/tests/baselines/reference/textChanges/deleteRange1.js
@@ -0,0 +1,15 @@
+===ORIGINAL===
+
+function foo() {
+    return 1;
+}
+
+function bar() {
+    return 2;
+}
+
+===MODIFIED===
+
+function bar() {
+    return 2;
+}
diff --git a/tests/baselines/reference/textChanges/extractMethodLike.js b/tests/baselines/reference/textChanges/extractMethodLike.js
new file mode 100644
index 00000000000..fa1d625dc4d
--- /dev/null
+++ b/tests/baselines/reference/textChanges/extractMethodLike.js
@@ -0,0 +1,49 @@
+===ORIGINAL===
+
+namespace M 
+{
+    namespace M2 
+    {
+        function foo() {
+            // comment 1
+            const x = 1;
+
+            /**
+             * comment 2 line 1
+             * comment 2 line 2
+             */
+            function f() {
+                return 100;
+            }
+            const y = 2; // comment 3
+            return 1;
+        }
+    }
+}
+===MODIFIED===
+
+namespace M 
+{
+    function bar(): any
+    {
+        /**
+         * comment 2 line 1
+         * comment 2 line 2
+         */
+        function f()
+        {
+            return 100;
+        }
+        const y = 2; // comment 3
+        return 1;
+    }
+    namespace M2 
+    {
+        function foo() {
+            // comment 1
+            const x = 1;
+
+            return bar();
+        }
+    }
+}
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeAfter1.js b/tests/baselines/reference/textChanges/insertNodeAfter1.js
new file mode 100644
index 00000000000..e6d7387f6bc
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeAfter1.js
@@ -0,0 +1,26 @@
+===ORIGINAL===
+
+namespace M {
+    // comment 1
+    var x = 1; // comment 2
+    // comment 3
+    var y; // comment 4
+    var z = 3; // comment 5
+    // comment 6
+    var a = 4; // comment 7
+}
+===MODIFIED===
+
+namespace M {
+    // comment 1
+    var x = 1; // comment 2
+    // comment 3
+    var y; // comment 4
+    public class class1 implements interface1
+    {
+        property1: boolean;
+    }
+    var z = 3; // comment 5
+    // comment 6
+    var a = 4; // comment 7
+}
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeAfter2.js b/tests/baselines/reference/textChanges/insertNodeAfter2.js
new file mode 100644
index 00000000000..7c027e35b50
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeAfter2.js
@@ -0,0 +1,26 @@
+===ORIGINAL===
+
+namespace M {
+    // comment 1
+    var x = 1; // comment 2
+    // comment 3
+    var y; // comment 4
+    var z = 3; // comment 5
+    // comment 6
+    var a = 4; // comment 7
+}
+===MODIFIED===
+
+namespace M {
+    // comment 1
+    var x = 1; // comment 2
+    // comment 3
+    var y; // comment 4
+    var z = 3; // comment 5
+    // comment 6
+    var a = 4; // comment 7
+}
+public class class1 implements interface1
+{
+    property1: boolean;
+}
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeAfter3-block with newline.js b/tests/baselines/reference/textChanges/insertNodeAfter3-block with newline.js
new file mode 100644
index 00000000000..41bfb72b574
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeAfter3-block with newline.js	
@@ -0,0 +1,16 @@
+===ORIGINAL===
+
+class A {
+    constructor() {
+
+    }
+}
+
+===MODIFIED===
+
+class A {
+    constructor() {
+        super();
+
+    }
+}
diff --git a/tests/baselines/reference/textChanges/insertNodeAfter3.js b/tests/baselines/reference/textChanges/insertNodeAfter3.js
new file mode 100644
index 00000000000..3765bbaf032
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeAfter3.js
@@ -0,0 +1,14 @@
+===ORIGINAL===
+
+class A {
+    constructor() {
+    }
+}
+
+===MODIFIED===
+
+class A {
+    constructor() {
+        super();
+    }
+}
diff --git a/tests/baselines/reference/textChanges/insertNodeAfter4.js b/tests/baselines/reference/textChanges/insertNodeAfter4.js
new file mode 100644
index 00000000000..3ca51db4989
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeAfter4.js
@@ -0,0 +1,16 @@
+===ORIGINAL===
+
+class A {
+    constructor() {
+        var x = 1;
+    }
+}
+
+===MODIFIED===
+
+class A {
+    constructor() {
+        var x = 1;
+        super();
+    }
+}
diff --git a/tests/baselines/reference/textChanges/insertNodeAfterInClass1.js b/tests/baselines/reference/textChanges/insertNodeAfterInClass1.js
new file mode 100644
index 00000000000..841d43fef97
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeAfterInClass1.js
@@ -0,0 +1,12 @@
+===ORIGINAL===
+
+class A {
+    x
+}
+
+===MODIFIED===
+
+class A {
+    x;
+    a: boolean;
+}
diff --git a/tests/baselines/reference/textChanges/insertNodeAfterInClass2.js b/tests/baselines/reference/textChanges/insertNodeAfterInClass2.js
new file mode 100644
index 00000000000..1d583d8ac90
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeAfterInClass2.js
@@ -0,0 +1,12 @@
+===ORIGINAL===
+
+class A {
+    x;
+}
+
+===MODIFIED===
+
+class A {
+    x;
+    a: boolean;
+}
diff --git a/tests/baselines/reference/textChanges/insertNodeAfterMultipleNodes.js b/tests/baselines/reference/textChanges/insertNodeAfterMultipleNodes.js
new file mode 100644
index 00000000000..1c3bbe4d3e2
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeAfterMultipleNodes.js
@@ -0,0 +1,21 @@
+===ORIGINAL===
+
+class A {
+    x;
+}
+===MODIFIED===
+
+class A {
+    x;
+    0;
+    1;
+    2;
+    3;
+    4;
+    5;
+    6;
+    7;
+    8;
+    9;
+    10;
+}
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeAt1.js b/tests/baselines/reference/textChanges/insertNodeAt1.js
new file mode 100644
index 00000000000..9c7ac46f8a8
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeAt1.js
@@ -0,0 +1,22 @@
+===ORIGINAL===
+
+// comment 1
+var x = 1; // comment 2
+// comment 3
+var y; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
+===MODIFIED===
+
+// comment 1
+var x = 1; // comment 2
+// comment 3
+public class class1 implements interface1
+{
+    property1: boolean;
+}
+var y; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeAt2.js b/tests/baselines/reference/textChanges/insertNodeAt2.js
new file mode 100644
index 00000000000..81c3e2afc35
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeAt2.js
@@ -0,0 +1,20 @@
+===ORIGINAL===
+
+// comment 1
+var x = 1; // comment 2
+// comment 3
+var y; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
+===MODIFIED===
+
+// comment 1
+var x = 1; // comment 2
+// comment 3
+var yz1 = {
+    p1: 1
+}; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeBefore1.js b/tests/baselines/reference/textChanges/insertNodeBefore1.js
new file mode 100644
index 00000000000..deebe10b694
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeBefore1.js
@@ -0,0 +1,26 @@
+===ORIGINAL===
+
+namespace M {
+    // comment 1
+    var x = 1; // comment 2
+    // comment 3
+    var y; // comment 4
+    var z = 3; // comment 5
+    // comment 6
+    var a = 4; // comment 7
+}
+===MODIFIED===
+
+namespace M {
+    // comment 1
+    var x = 1; // comment 2
+    public class class1 implements interface1
+    {
+        property1: boolean;
+    }
+    // comment 3
+    var y; // comment 4
+    var z = 3; // comment 5
+    // comment 6
+    var a = 4; // comment 7
+}
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeBefore2.js b/tests/baselines/reference/textChanges/insertNodeBefore2.js
new file mode 100644
index 00000000000..1792cd5e69c
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeBefore2.js
@@ -0,0 +1,26 @@
+===ORIGINAL===
+
+namespace M {
+    // comment 1
+    var x = 1; // comment 2
+    // comment 3
+    var y; // comment 4
+    var z = 3; // comment 5
+    // comment 6
+    var a = 4; // comment 7
+}
+===MODIFIED===
+
+public class class1 implements interface1
+{
+    property1: boolean;
+}
+namespace M {
+    // comment 1
+    var x = 1; // comment 2
+    // comment 3
+    var y; // comment 4
+    var z = 3; // comment 5
+    // comment 6
+    var a = 4; // comment 7
+}
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeInClassAfterNodeWithoutSeparator1.js b/tests/baselines/reference/textChanges/insertNodeInClassAfterNodeWithoutSeparator1.js
new file mode 100644
index 00000000000..0c47c26221f
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeInClassAfterNodeWithoutSeparator1.js
@@ -0,0 +1,12 @@
+===ORIGINAL===
+
+class A {
+    x = foo
+}
+
+===MODIFIED===
+
+class A {
+    x = foo;
+    [1]: any;
+}
diff --git a/tests/baselines/reference/textChanges/insertNodeInClassAfterNodeWithoutSeparator2.js b/tests/baselines/reference/textChanges/insertNodeInClassAfterNodeWithoutSeparator2.js
new file mode 100644
index 00000000000..bd6302b29a6
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeInClassAfterNodeWithoutSeparator2.js
@@ -0,0 +1,14 @@
+===ORIGINAL===
+
+class A {
+    x() {
+    }
+}
+
+===MODIFIED===
+
+class A {
+    x() {
+    }
+    [1]: any;
+}
diff --git a/tests/baselines/reference/textChanges/insertNodeInInterfaceAfterNodeWithoutSeparator1.js b/tests/baselines/reference/textChanges/insertNodeInInterfaceAfterNodeWithoutSeparator1.js
new file mode 100644
index 00000000000..61910e64dd5
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeInInterfaceAfterNodeWithoutSeparator1.js
@@ -0,0 +1,12 @@
+===ORIGINAL===
+
+interface A {
+    x
+}
+
+===MODIFIED===
+
+interface A {
+    x;
+    [1]: any;
+}
diff --git a/tests/baselines/reference/textChanges/insertNodeInInterfaceAfterNodeWithoutSeparator2.js b/tests/baselines/reference/textChanges/insertNodeInInterfaceAfterNodeWithoutSeparator2.js
new file mode 100644
index 00000000000..6e88a371eb6
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeInInterfaceAfterNodeWithoutSeparator2.js
@@ -0,0 +1,12 @@
+===ORIGINAL===
+
+interface A {
+    x()
+}
+
+===MODIFIED===
+
+interface A {
+    x();
+    [1]: any;
+}
diff --git a/tests/baselines/reference/textChanges/insertNodeInListAfter1.js b/tests/baselines/reference/textChanges/insertNodeInListAfter1.js
new file mode 100644
index 00000000000..9b0ed7b819d
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeInListAfter1.js
@@ -0,0 +1,6 @@
+===ORIGINAL===
+
+const x = 1, y = 2;
+===MODIFIED===
+
+const x = 1, z = 1, y = 2;
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeInListAfter10.js b/tests/baselines/reference/textChanges/insertNodeInListAfter10.js
new file mode 100644
index 00000000000..300230bf51c
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeInListAfter10.js
@@ -0,0 +1,10 @@
+===ORIGINAL===
+
+import {
+    x
+} from "bar"
+===MODIFIED===
+
+import {
+    x, b as a
+} from "bar"
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeInListAfter11.js b/tests/baselines/reference/textChanges/insertNodeInListAfter11.js
new file mode 100644
index 00000000000..f0ba43a0f3a
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeInListAfter11.js
@@ -0,0 +1,11 @@
+===ORIGINAL===
+
+import {
+    x // this is x
+} from "bar"
+===MODIFIED===
+
+import {
+    x, // this is x
+    b as a
+} from "bar"
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeInListAfter12.js b/tests/baselines/reference/textChanges/insertNodeInListAfter12.js
new file mode 100644
index 00000000000..79e7bb2c8b6
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeInListAfter12.js
@@ -0,0 +1,10 @@
+===ORIGINAL===
+
+import {
+    x
+} from "bar"
+===MODIFIED===
+
+import {
+    x, a
+} from "bar"
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeInListAfter13.js b/tests/baselines/reference/textChanges/insertNodeInListAfter13.js
new file mode 100644
index 00000000000..a7ac7179ab6
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeInListAfter13.js
@@ -0,0 +1,11 @@
+===ORIGINAL===
+
+import {
+    x // this is x
+} from "bar"
+===MODIFIED===
+
+import {
+    x, // this is x
+    a
+} from "bar"
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeInListAfter14.js b/tests/baselines/reference/textChanges/insertNodeInListAfter14.js
new file mode 100644
index 00000000000..e44a21723be
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeInListAfter14.js
@@ -0,0 +1,13 @@
+===ORIGINAL===
+
+import {
+    x0,
+    x
+} from "bar"
+===MODIFIED===
+
+import {
+    x0,
+    x,
+    b as a
+} from "bar"
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeInListAfter15.js b/tests/baselines/reference/textChanges/insertNodeInListAfter15.js
new file mode 100644
index 00000000000..a80bdc2db5e
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeInListAfter15.js
@@ -0,0 +1,13 @@
+===ORIGINAL===
+
+import {
+    x0,
+    x // this is x
+} from "bar"
+===MODIFIED===
+
+import {
+    x0,
+    x, // this is x
+    b as a
+} from "bar"
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeInListAfter16.js b/tests/baselines/reference/textChanges/insertNodeInListAfter16.js
new file mode 100644
index 00000000000..07f8db919f8
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeInListAfter16.js
@@ -0,0 +1,13 @@
+===ORIGINAL===
+
+import {
+    x0,
+    x
+} from "bar"
+===MODIFIED===
+
+import {
+    x0,
+    x,
+    a
+} from "bar"
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeInListAfter17.js b/tests/baselines/reference/textChanges/insertNodeInListAfter17.js
new file mode 100644
index 00000000000..990139408ee
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeInListAfter17.js
@@ -0,0 +1,13 @@
+===ORIGINAL===
+
+import {
+    x0,
+    x // this is x
+} from "bar"
+===MODIFIED===
+
+import {
+    x0,
+    x, // this is x
+    a
+} from "bar"
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeInListAfter18.js b/tests/baselines/reference/textChanges/insertNodeInListAfter18.js
new file mode 100644
index 00000000000..b25a3f46346
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeInListAfter18.js
@@ -0,0 +1,10 @@
+===ORIGINAL===
+
+import {
+    x0, x
+} from "bar"
+===MODIFIED===
+
+import {
+    x0, x, a
+} from "bar"
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeInListAfter2.js b/tests/baselines/reference/textChanges/insertNodeInListAfter2.js
new file mode 100644
index 00000000000..32e8e63c0f6
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeInListAfter2.js
@@ -0,0 +1,6 @@
+===ORIGINAL===
+
+const x = 1, y = 2;
+===MODIFIED===
+
+const x = 1, y = 2, z = 1;
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeInListAfter3.js b/tests/baselines/reference/textChanges/insertNodeInListAfter3.js
new file mode 100644
index 00000000000..70a0b0bddcb
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeInListAfter3.js
@@ -0,0 +1,6 @@
+===ORIGINAL===
+
+const /*x*/ x = 1, /*y*/ y = 2;
+===MODIFIED===
+
+const /*x*/ x = 1, z = 1, /*y*/ y = 2;
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeInListAfter4.js b/tests/baselines/reference/textChanges/insertNodeInListAfter4.js
new file mode 100644
index 00000000000..4a30acd7071
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeInListAfter4.js
@@ -0,0 +1,6 @@
+===ORIGINAL===
+
+const /*x*/ x = 1, /*y*/ y = 2;
+===MODIFIED===
+
+const /*x*/ x = 1, /*y*/ y = 2, z = 1;
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeInListAfter5.js b/tests/baselines/reference/textChanges/insertNodeInListAfter5.js
new file mode 100644
index 00000000000..42d5fe2ca40
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeInListAfter5.js
@@ -0,0 +1,6 @@
+===ORIGINAL===
+
+const x = 1;
+===MODIFIED===
+
+const x = 1, z = 1;
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeInListAfter6.js b/tests/baselines/reference/textChanges/insertNodeInListAfter6.js
new file mode 100644
index 00000000000..06eae7372a9
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeInListAfter6.js
@@ -0,0 +1,9 @@
+===ORIGINAL===
+
+const x = 1, 
+    y = 2;
+===MODIFIED===
+
+const x = 1, 
+    z = 1, 
+    y = 2;
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeInListAfter7.js b/tests/baselines/reference/textChanges/insertNodeInListAfter7.js
new file mode 100644
index 00000000000..bef01503683
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeInListAfter7.js
@@ -0,0 +1,9 @@
+===ORIGINAL===
+
+const x = 1, 
+    y = 2;
+===MODIFIED===
+
+const x = 1, 
+    y = 2,
+    z = 1;
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeInListAfter8.js b/tests/baselines/reference/textChanges/insertNodeInListAfter8.js
new file mode 100644
index 00000000000..e3c44b14274
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeInListAfter8.js
@@ -0,0 +1,9 @@
+===ORIGINAL===
+
+const /*x*/ x = 1, 
+    /*y*/ y = 2;
+===MODIFIED===
+
+const /*x*/ x = 1, 
+    z = 1, 
+    /*y*/ y = 2;
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeInListAfter9.js b/tests/baselines/reference/textChanges/insertNodeInListAfter9.js
new file mode 100644
index 00000000000..510984b7574
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeInListAfter9.js
@@ -0,0 +1,9 @@
+===ORIGINAL===
+
+const /*x*/ x = 1, 
+    /*y*/ y = 2;
+===MODIFIED===
+
+const /*x*/ x = 1, 
+    /*y*/ y = 2,
+    z = 1;
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/insertNodeInStatementListAfterNodeWithoutSeparator1.js b/tests/baselines/reference/textChanges/insertNodeInStatementListAfterNodeWithoutSeparator1.js
new file mode 100644
index 00000000000..b28b1579dfc
--- /dev/null
+++ b/tests/baselines/reference/textChanges/insertNodeInStatementListAfterNodeWithoutSeparator1.js
@@ -0,0 +1,8 @@
+===ORIGINAL===
+
+let x = foo
+
+===MODIFIED===
+
+let x = foo;
+(1);
diff --git a/tests/baselines/reference/textChanges/replaceNode1.js b/tests/baselines/reference/textChanges/replaceNode1.js
new file mode 100644
index 00000000000..8511d510385
--- /dev/null
+++ b/tests/baselines/reference/textChanges/replaceNode1.js
@@ -0,0 +1,20 @@
+===ORIGINAL===
+
+// comment 1
+var x = 1; // comment 2
+// comment 3
+var y = 2; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
+===MODIFIED===
+
+// comment 1
+var x = 1; // comment 2
+public class class1 implements interface1
+{
+    property1: boolean;
+}
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/replaceNode1NoLineBreakBefore.js b/tests/baselines/reference/textChanges/replaceNode1NoLineBreakBefore.js
new file mode 100644
index 00000000000..44183d402ab
--- /dev/null
+++ b/tests/baselines/reference/textChanges/replaceNode1NoLineBreakBefore.js
@@ -0,0 +1,13 @@
+===ORIGINAL===
+
+namespace A {
+    const x = 1, y = "2";
+}
+
+===MODIFIED===
+
+namespace A {
+    const x = 1, z1 = {
+        p1: 1
+    };
+}
diff --git a/tests/baselines/reference/textChanges/replaceNode2.js b/tests/baselines/reference/textChanges/replaceNode2.js
new file mode 100644
index 00000000000..66a17f7c910
--- /dev/null
+++ b/tests/baselines/reference/textChanges/replaceNode2.js
@@ -0,0 +1,20 @@
+===ORIGINAL===
+
+// comment 1
+var x = 1; // comment 2
+// comment 3
+var y = 2; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
+===MODIFIED===
+
+// comment 1
+var x = 1;
+public class class1 implements interface1
+{
+    property1: boolean;
+}
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/replaceNode3.js b/tests/baselines/reference/textChanges/replaceNode3.js
new file mode 100644
index 00000000000..9f321a97431
--- /dev/null
+++ b/tests/baselines/reference/textChanges/replaceNode3.js
@@ -0,0 +1,21 @@
+===ORIGINAL===
+
+// comment 1
+var x = 1; // comment 2
+// comment 3
+var y = 2; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
+===MODIFIED===
+
+// comment 1
+var x = 1; // comment 2
+public class class1 implements interface1
+{
+    property1: boolean;
+}
+ // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/replaceNode4.js b/tests/baselines/reference/textChanges/replaceNode4.js
new file mode 100644
index 00000000000..e5bbf0e306d
--- /dev/null
+++ b/tests/baselines/reference/textChanges/replaceNode4.js
@@ -0,0 +1,19 @@
+===ORIGINAL===
+
+// comment 1
+var x = 1; // comment 2
+// comment 3
+var y = 2; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
+===MODIFIED===
+
+// comment 1
+var x = 1;public class class1 implements interface1
+{
+    property1: boolean;
+} // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/replaceNode5.js b/tests/baselines/reference/textChanges/replaceNode5.js
new file mode 100644
index 00000000000..ad3ec0ab0ea
--- /dev/null
+++ b/tests/baselines/reference/textChanges/replaceNode5.js
@@ -0,0 +1,19 @@
+===ORIGINAL===
+
+// comment 1
+var x = 1; // comment 2
+// comment 3
+var y = 2; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
+===MODIFIED===
+public class class1 implements interface1
+{
+    property1: boolean;
+} // comment 2
+// comment 3
+var y = 2; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/replaceNodeRange1.js b/tests/baselines/reference/textChanges/replaceNodeRange1.js
new file mode 100644
index 00000000000..5fc16960a8a
--- /dev/null
+++ b/tests/baselines/reference/textChanges/replaceNodeRange1.js
@@ -0,0 +1,19 @@
+===ORIGINAL===
+
+// comment 1
+var x = 1; // comment 2
+// comment 3
+var y = 2; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
+===MODIFIED===
+
+// comment 1
+var x = 1; // comment 2
+public class class1 implements interface1
+{
+    property1: boolean;
+}
+// comment 6
+var a = 4; // comment 7
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/replaceNodeRange2.js b/tests/baselines/reference/textChanges/replaceNodeRange2.js
new file mode 100644
index 00000000000..e8f9506d608
--- /dev/null
+++ b/tests/baselines/reference/textChanges/replaceNodeRange2.js
@@ -0,0 +1,19 @@
+===ORIGINAL===
+
+// comment 1
+var x = 1; // comment 2
+// comment 3
+var y = 2; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
+===MODIFIED===
+
+// comment 1
+var x = 1;
+public class class1 implements interface1
+{
+    property1: boolean;
+}
+// comment 6
+var a = 4; // comment 7
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/replaceNodeRange3.js b/tests/baselines/reference/textChanges/replaceNodeRange3.js
new file mode 100644
index 00000000000..a20dddc53fe
--- /dev/null
+++ b/tests/baselines/reference/textChanges/replaceNodeRange3.js
@@ -0,0 +1,20 @@
+===ORIGINAL===
+
+// comment 1
+var x = 1; // comment 2
+// comment 3
+var y = 2; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
+===MODIFIED===
+
+// comment 1
+var x = 1; // comment 2
+public class class1 implements interface1
+{
+    property1: boolean;
+}
+ // comment 5
+// comment 6
+var a = 4; // comment 7
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/replaceNodeRange4.js b/tests/baselines/reference/textChanges/replaceNodeRange4.js
new file mode 100644
index 00000000000..ad50a1f01fc
--- /dev/null
+++ b/tests/baselines/reference/textChanges/replaceNodeRange4.js
@@ -0,0 +1,18 @@
+===ORIGINAL===
+
+// comment 1
+var x = 1; // comment 2
+// comment 3
+var y = 2; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
+===MODIFIED===
+
+// comment 1
+var x = 1;public class class1 implements interface1
+{
+    property1: boolean;
+} // comment 5
+// comment 6
+var a = 4; // comment 7
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/replaceRange.js b/tests/baselines/reference/textChanges/replaceRange.js
new file mode 100644
index 00000000000..8cb83286169
--- /dev/null
+++ b/tests/baselines/reference/textChanges/replaceRange.js
@@ -0,0 +1,19 @@
+===ORIGINAL===
+
+// comment 1
+var x = 1; // comment 2
+// comment 3
+var y = 2; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
+===MODIFIED===
+
+// comment 1
+var x = 1; // comment 2
+// comment 3
+public class class1 implements interface1
+{
+    property1: boolean;
+}
+var a = 4; // comment 7
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/replaceRangeNoLineBreakBefore.js b/tests/baselines/reference/textChanges/replaceRangeNoLineBreakBefore.js
new file mode 100644
index 00000000000..72a45ee56e2
--- /dev/null
+++ b/tests/baselines/reference/textChanges/replaceRangeNoLineBreakBefore.js
@@ -0,0 +1,6 @@
+===ORIGINAL===
+const x = 1, y = "2";
+===MODIFIED===
+const x = 1, z1 = {
+    p1: 1
+};
\ No newline at end of file
diff --git a/tests/baselines/reference/textChanges/replaceRangeWithForcedIndentation.js b/tests/baselines/reference/textChanges/replaceRangeWithForcedIndentation.js
new file mode 100644
index 00000000000..304b81b1359
--- /dev/null
+++ b/tests/baselines/reference/textChanges/replaceRangeWithForcedIndentation.js
@@ -0,0 +1,19 @@
+===ORIGINAL===
+
+// comment 1
+var x = 1; // comment 2
+// comment 3
+var y = 2; // comment 4
+var z = 3; // comment 5
+// comment 6
+var a = 4; // comment 7
+===MODIFIED===
+
+// comment 1
+var x = 1; // comment 2
+// comment 3
+        public class class1 implements interface1
+        {
+        property1: boolean;
+        }
+var a = 4; // comment 7
\ No newline at end of file
diff --git a/tests/baselines/reference/thisTypeInNativeThisAssignableMethods.js b/tests/baselines/reference/thisTypeInNativeThisAssignableMethods.js
new file mode 100644
index 00000000000..d9020c79e29
--- /dev/null
+++ b/tests/baselines/reference/thisTypeInNativeThisAssignableMethods.js
@@ -0,0 +1,710 @@
+//// [thisTypeInNativeThisAssignableMethods.ts]
+
+class A {
+    options: string[];
+
+    addOptions(options: string[]) {
+        if (!this.options) {
+            this.options = [];
+        }
+        options.forEach(function (item) {
+            this.options.push(item);
+        }, this);
+        return this;
+    }
+
+    testUndefined(options: string[]) {
+        const undefinedArr: Array<undefined> = []
+        options.forEach(function () {
+            undefinedArr.push(this);
+        }); // case1
+        options.forEach(function () {
+            undefinedArr.push(this);
+        }, undefined); // case2
+        options.forEach(function () {
+            undefinedArr.push(this);
+        }, null); // case3
+
+        const arrLike = {} as ArrayLike<number>
+        Array.from(arrLike, function (item) {
+            return this === undefined ? 2 : 1;
+        }, undefined)
+
+        const iterLike = [] as Iterable<number>
+        Array.from(iterLike, function (item) {
+            return this === undefined ? 2 : 1;
+        }, undefined)
+    }
+
+    test(options: string[]) {
+        const thisObject = {
+            options: [] as string[]
+        };
+
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        const arrLike = {} as ArrayLike<number>
+        Array.from(arrLike, function (item) {
+            return this.options[item].length
+        }, thisObject)
+
+        const iterLike = [] as Iterable<number>
+        Array.from(iterLike, function (item) {
+            return this.options[item].length
+        }, thisObject)
+    }
+
+    test1(options: string[]) {
+        const thisObject = {
+            options: [] as ReadonlyArray<string>
+        };
+
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+
+    test2(options: Int8Array[]) {
+        const thisObject = {
+            options: [] as Int8Array[]
+        };
+
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+
+    test3(options: Uint8Array[]) {
+        const thisObject = {
+            options: [] as Uint8Array[]
+        };
+
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+
+    test4(options: Float32Array[]) {
+        const thisObject = {
+            options: [] as Float32Array[]
+        };
+
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+
+    test5(options: Uint8ClampedArray[]) {
+        const thisObject = {
+            options: [] as Uint8ClampedArray[]
+        };
+
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+
+    test6(options: Int16Array[]) {
+        const thisObject = {
+            options: [] as Int16Array[]
+        };
+
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+
+    test7(options: Uint16Array[]) {
+        const thisObject = {
+            options: [] as Uint16Array[]
+        };
+
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+
+    test8(options: Uint32Array[]) {
+        const thisObject = {
+            options: [] as Uint32Array[]
+        };
+
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+
+    test9(options: Float64Array[]) {
+        const thisObject = {
+            options: [] as Float64Array[]
+        };
+
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+}
+
+
+//// [thisTypeInNativeThisAssignableMethods.js]
+class A {
+    addOptions(options) {
+        if (!this.options) {
+            this.options = [];
+        }
+        options.forEach(function (item) {
+            this.options.push(item);
+        }, this);
+        return this;
+    }
+    testUndefined(options) {
+        const undefinedArr = [];
+        options.forEach(function () {
+            undefinedArr.push(this);
+        }); // case1
+        options.forEach(function () {
+            undefinedArr.push(this);
+        }, undefined); // case2
+        options.forEach(function () {
+            undefinedArr.push(this);
+        }, null); // case3
+        const arrLike = {};
+        Array.from(arrLike, function (item) {
+            return this === undefined ? 2 : 1;
+        }, undefined);
+        const iterLike = [];
+        Array.from(iterLike, function (item) {
+            return this === undefined ? 2 : 1;
+        }, undefined);
+    }
+    test(options) {
+        const thisObject = {
+            options: []
+        };
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        const arrLike = {};
+        Array.from(arrLike, function (item) {
+            return this.options[item].length;
+        }, thisObject);
+        const iterLike = [];
+        Array.from(iterLike, function (item) {
+            return this.options[item].length;
+        }, thisObject);
+    }
+    test1(options) {
+        const thisObject = {
+            options: []
+        };
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+    test2(options) {
+        const thisObject = {
+            options: []
+        };
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+    test3(options) {
+        const thisObject = {
+            options: []
+        };
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+    test4(options) {
+        const thisObject = {
+            options: []
+        };
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+    test5(options) {
+        const thisObject = {
+            options: []
+        };
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+    test6(options) {
+        const thisObject = {
+            options: []
+        };
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+    test7(options) {
+        const thisObject = {
+            options: []
+        };
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+    test8(options) {
+        const thisObject = {
+            options: []
+        };
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+    test9(options) {
+        const thisObject = {
+            options: []
+        };
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+}
diff --git a/tests/baselines/reference/thisTypeInNativeThisAssignableMethods.symbols b/tests/baselines/reference/thisTypeInNativeThisAssignableMethods.symbols
new file mode 100644
index 00000000000..2ff555baa54
--- /dev/null
+++ b/tests/baselines/reference/thisTypeInNativeThisAssignableMethods.symbols
@@ -0,0 +1,1569 @@
+=== tests/cases/compiler/thisTypeInNativeThisAssignableMethods.ts ===
+
+class A {
+>A : Symbol(A, Decl(thisTypeInNativeThisAssignableMethods.ts, 0, 0))
+
+    options: string[];
+>options : Symbol(A.options, Decl(thisTypeInNativeThisAssignableMethods.ts, 1, 9))
+
+    addOptions(options: string[]) {
+>addOptions : Symbol(A.addOptions, Decl(thisTypeInNativeThisAssignableMethods.ts, 2, 22))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 4, 15))
+
+        if (!this.options) {
+>this.options : Symbol(A.options, Decl(thisTypeInNativeThisAssignableMethods.ts, 1, 9))
+>this : Symbol(A, Decl(thisTypeInNativeThisAssignableMethods.ts, 0, 0))
+>options : Symbol(A.options, Decl(thisTypeInNativeThisAssignableMethods.ts, 1, 9))
+
+            this.options = [];
+>this.options : Symbol(A.options, Decl(thisTypeInNativeThisAssignableMethods.ts, 1, 9))
+>this : Symbol(A, Decl(thisTypeInNativeThisAssignableMethods.ts, 0, 0))
+>options : Symbol(A.options, Decl(thisTypeInNativeThisAssignableMethods.ts, 1, 9))
+        }
+        options.forEach(function (item) {
+>options.forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 4, 15))
+>forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>item : Symbol(item, Decl(thisTypeInNativeThisAssignableMethods.ts, 8, 34))
+
+            this.options.push(item);
+>this.options.push : Symbol(Array.push, Decl(lib.es5.d.ts, --, --))
+>this.options : Symbol(A.options, Decl(thisTypeInNativeThisAssignableMethods.ts, 1, 9))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(A.options, Decl(thisTypeInNativeThisAssignableMethods.ts, 1, 9))
+>push : Symbol(Array.push, Decl(lib.es5.d.ts, --, --))
+>item : Symbol(item, Decl(thisTypeInNativeThisAssignableMethods.ts, 8, 34))
+
+        }, this);
+>this : Symbol(A, Decl(thisTypeInNativeThisAssignableMethods.ts, 0, 0))
+
+        return this;
+>this : Symbol(A, Decl(thisTypeInNativeThisAssignableMethods.ts, 0, 0))
+    }
+
+    testUndefined(options: string[]) {
+>testUndefined : Symbol(A.testUndefined, Decl(thisTypeInNativeThisAssignableMethods.ts, 12, 5))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 14, 18))
+
+        const undefinedArr: Array<undefined> = []
+>undefinedArr : Symbol(undefinedArr, Decl(thisTypeInNativeThisAssignableMethods.ts, 15, 13))
+>Array : Symbol(Array, Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+
+        options.forEach(function () {
+>options.forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 14, 18))
+>forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+
+            undefinedArr.push(this);
+>undefinedArr.push : Symbol(Array.push, Decl(lib.es5.d.ts, --, --))
+>undefinedArr : Symbol(undefinedArr, Decl(thisTypeInNativeThisAssignableMethods.ts, 15, 13))
+>push : Symbol(Array.push, Decl(lib.es5.d.ts, --, --))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+
+        }); // case1
+        options.forEach(function () {
+>options.forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 14, 18))
+>forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+
+            undefinedArr.push(this);
+>undefinedArr.push : Symbol(Array.push, Decl(lib.es5.d.ts, --, --))
+>undefinedArr : Symbol(undefinedArr, Decl(thisTypeInNativeThisAssignableMethods.ts, 15, 13))
+>push : Symbol(Array.push, Decl(lib.es5.d.ts, --, --))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+
+        }, undefined); // case2
+>undefined : Symbol(undefined)
+
+        options.forEach(function () {
+>options.forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 14, 18))
+>forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+
+            undefinedArr.push(this);
+>undefinedArr.push : Symbol(Array.push, Decl(lib.es5.d.ts, --, --))
+>undefinedArr : Symbol(undefinedArr, Decl(thisTypeInNativeThisAssignableMethods.ts, 15, 13))
+>push : Symbol(Array.push, Decl(lib.es5.d.ts, --, --))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+
+        }, null); // case3
+
+        const arrLike = {} as ArrayLike<number>
+>arrLike : Symbol(arrLike, Decl(thisTypeInNativeThisAssignableMethods.ts, 26, 13))
+>ArrayLike : Symbol(ArrayLike, Decl(lib.es5.d.ts, --, --))
+
+        Array.from(arrLike, function (item) {
+>Array.from : Symbol(ArrayConstructor.from, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>Array : Symbol(Array, Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>from : Symbol(ArrayConstructor.from, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>arrLike : Symbol(arrLike, Decl(thisTypeInNativeThisAssignableMethods.ts, 26, 13))
+>item : Symbol(item, Decl(thisTypeInNativeThisAssignableMethods.ts, 27, 38))
+
+            return this === undefined ? 2 : 1;
+>this : Symbol(this, Decl(lib.es2015.core.d.ts, --, --))
+>undefined : Symbol(undefined)
+
+        }, undefined)
+>undefined : Symbol(undefined)
+
+        const iterLike = [] as Iterable<number>
+>iterLike : Symbol(iterLike, Decl(thisTypeInNativeThisAssignableMethods.ts, 31, 13))
+>Iterable : Symbol(Iterable, Decl(lib.es2015.iterable.d.ts, --, --))
+
+        Array.from(iterLike, function (item) {
+>Array.from : Symbol(ArrayConstructor.from, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>Array : Symbol(Array, Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>from : Symbol(ArrayConstructor.from, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>iterLike : Symbol(iterLike, Decl(thisTypeInNativeThisAssignableMethods.ts, 31, 13))
+>item : Symbol(item, Decl(thisTypeInNativeThisAssignableMethods.ts, 32, 39))
+
+            return this === undefined ? 2 : 1;
+>this : Symbol(this, Decl(lib.es2015.iterable.d.ts, --, --))
+>undefined : Symbol(undefined)
+
+        }, undefined)
+>undefined : Symbol(undefined)
+    }
+
+    test(options: string[]) {
+>test : Symbol(A.test, Decl(thisTypeInNativeThisAssignableMethods.ts, 35, 5))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 37, 9))
+
+        const thisObject = {
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 13))
+
+            options: [] as string[]
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 28))
+
+        };
+
+        options.find(function (val, index) {
+>options.find : Symbol(Array.find, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 37, 9))
+>find : Symbol(Array.find, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 42, 31))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 42, 35))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 42, 31))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 28))
+>this : Symbol(this, Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 42, 35))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 13))
+
+        options.findIndex(function (val, index) {
+>options.findIndex : Symbol(Array.findIndex, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 37, 9))
+>findIndex : Symbol(Array.findIndex, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 46, 36))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 46, 40))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 46, 36))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 28))
+>this : Symbol(this, Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 46, 40))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 13))
+
+        options.forEach(function (val, index) {
+>options.forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 37, 9))
+>forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 50, 34))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 50, 38))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 50, 34))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 50, 38))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 13))
+
+        options.map(function (val, index) {
+>options.map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 37, 9))
+>map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 54, 30))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 54, 34))
+
+            if (val === this.options[index])
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 54, 30))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 54, 34))
+
+                return this.options[index];
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 54, 34))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 13))
+
+        options.some(function (val, index) {
+>options.some : Symbol(Array.some, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 37, 9))
+>some : Symbol(Array.some, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 59, 31))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 59, 35))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 59, 31))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 59, 35))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 13))
+
+        options.filter(function (val, index) {
+>options.filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 37, 9))
+>filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 63, 33))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 63, 37))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 63, 33))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 63, 37))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 13))
+
+        options.every(function (val, index) {
+>options.every : Symbol(Array.every, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 37, 9))
+>every : Symbol(Array.every, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 67, 32))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 67, 36))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 67, 32))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 67, 36))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 13))
+
+        const arrLike = {} as ArrayLike<number>
+>arrLike : Symbol(arrLike, Decl(thisTypeInNativeThisAssignableMethods.ts, 71, 13))
+>ArrayLike : Symbol(ArrayLike, Decl(lib.es5.d.ts, --, --))
+
+        Array.from(arrLike, function (item) {
+>Array.from : Symbol(ArrayConstructor.from, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>Array : Symbol(Array, Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>from : Symbol(ArrayConstructor.from, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>arrLike : Symbol(arrLike, Decl(thisTypeInNativeThisAssignableMethods.ts, 71, 13))
+>item : Symbol(item, Decl(thisTypeInNativeThisAssignableMethods.ts, 72, 38))
+
+            return this.options[item].length
+>this.options[item].length : Symbol(String.length, Decl(lib.es5.d.ts, --, --))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 28))
+>this : Symbol(this, Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 28))
+>item : Symbol(item, Decl(thisTypeInNativeThisAssignableMethods.ts, 72, 38))
+>length : Symbol(String.length, Decl(lib.es5.d.ts, --, --))
+
+        }, thisObject)
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 13))
+
+        const iterLike = [] as Iterable<number>
+>iterLike : Symbol(iterLike, Decl(thisTypeInNativeThisAssignableMethods.ts, 76, 13))
+>Iterable : Symbol(Iterable, Decl(lib.es2015.iterable.d.ts, --, --))
+
+        Array.from(iterLike, function (item) {
+>Array.from : Symbol(ArrayConstructor.from, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>Array : Symbol(Array, Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>from : Symbol(ArrayConstructor.from, Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>iterLike : Symbol(iterLike, Decl(thisTypeInNativeThisAssignableMethods.ts, 76, 13))
+>item : Symbol(item, Decl(thisTypeInNativeThisAssignableMethods.ts, 77, 39))
+
+            return this.options[item].length
+>this.options[item].length : Symbol(String.length, Decl(lib.es5.d.ts, --, --))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 28))
+>this : Symbol(this, Decl(lib.es2015.iterable.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 28))
+>item : Symbol(item, Decl(thisTypeInNativeThisAssignableMethods.ts, 77, 39))
+>length : Symbol(String.length, Decl(lib.es5.d.ts, --, --))
+
+        }, thisObject)
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 38, 13))
+    }
+
+    test1(options: string[]) {
+>test1 : Symbol(A.test1, Decl(thisTypeInNativeThisAssignableMethods.ts, 80, 5))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 82, 10))
+
+        const thisObject = {
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 13))
+
+            options: [] as ReadonlyArray<string>
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 28))
+>ReadonlyArray : Symbol(ReadonlyArray, Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+
+        };
+
+        options.find(function (val, index) {
+>options.find : Symbol(Array.find, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 82, 10))
+>find : Symbol(Array.find, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 87, 31))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 87, 35))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 87, 31))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 28))
+>this : Symbol(this, Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 87, 35))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 13))
+
+        options.findIndex(function (val, index) {
+>options.findIndex : Symbol(Array.findIndex, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 82, 10))
+>findIndex : Symbol(Array.findIndex, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 91, 36))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 91, 40))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 91, 36))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 28))
+>this : Symbol(this, Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 91, 40))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 13))
+
+        options.forEach(function (val, index) {
+>options.forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 82, 10))
+>forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 95, 34))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 95, 38))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 95, 34))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 95, 38))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 13))
+
+        options.map(function (val, index) {
+>options.map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 82, 10))
+>map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 99, 30))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 99, 34))
+
+            if (val === this.options[index])
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 99, 30))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 99, 34))
+
+                return this.options[index];
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 99, 34))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 13))
+
+        options.some(function (val, index) {
+>options.some : Symbol(Array.some, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 82, 10))
+>some : Symbol(Array.some, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 104, 31))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 104, 35))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 104, 31))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 104, 35))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 13))
+
+        options.filter(function (val, index) {
+>options.filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 82, 10))
+>filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 108, 33))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 108, 37))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 108, 33))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 108, 37))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 13))
+
+        options.every(function (val, index) {
+>options.every : Symbol(Array.every, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 82, 10))
+>every : Symbol(Array.every, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 112, 32))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 112, 36))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 112, 32))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 112, 36))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 83, 13))
+    }
+
+    test2(options: Int8Array[]) {
+>test2 : Symbol(A.test2, Decl(thisTypeInNativeThisAssignableMethods.ts, 115, 5))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 117, 10))
+>Int8Array : Symbol(Int8Array, Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+
+        const thisObject = {
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 13))
+
+            options: [] as Int8Array[]
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 28))
+>Int8Array : Symbol(Int8Array, Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+
+        };
+
+        options.find(function (val, index) {
+>options.find : Symbol(Array.find, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 117, 10))
+>find : Symbol(Array.find, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 122, 31))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 122, 35))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 122, 31))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 28))
+>this : Symbol(this, Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 122, 35))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 13))
+
+        options.findIndex(function (val, index) {
+>options.findIndex : Symbol(Array.findIndex, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 117, 10))
+>findIndex : Symbol(Array.findIndex, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 126, 36))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 126, 40))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 126, 36))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 28))
+>this : Symbol(this, Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 126, 40))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 13))
+
+        options.forEach(function (val, index) {
+>options.forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 117, 10))
+>forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 130, 34))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 130, 38))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 130, 34))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 130, 38))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 13))
+
+        options.map(function (val, index) {
+>options.map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 117, 10))
+>map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 134, 30))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 134, 34))
+
+            if (val === this.options[index])
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 134, 30))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 134, 34))
+
+                return this.options[index];
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 134, 34))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 13))
+
+        options.some(function (val, index) {
+>options.some : Symbol(Array.some, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 117, 10))
+>some : Symbol(Array.some, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 139, 31))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 139, 35))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 139, 31))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 139, 35))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 13))
+
+        options.filter(function (val, index) {
+>options.filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 117, 10))
+>filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 143, 33))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 143, 37))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 143, 33))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 143, 37))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 13))
+
+        options.every(function (val, index) {
+>options.every : Symbol(Array.every, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 117, 10))
+>every : Symbol(Array.every, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 147, 32))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 147, 36))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 147, 32))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 147, 36))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 118, 13))
+    }
+
+    test3(options: Uint8Array[]) {
+>test3 : Symbol(A.test3, Decl(thisTypeInNativeThisAssignableMethods.ts, 150, 5))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 152, 10))
+>Uint8Array : Symbol(Uint8Array, Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+
+        const thisObject = {
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 13))
+
+            options: [] as Uint8Array[]
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 28))
+>Uint8Array : Symbol(Uint8Array, Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+
+        };
+
+        options.find(function (val, index) {
+>options.find : Symbol(Array.find, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 152, 10))
+>find : Symbol(Array.find, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 157, 31))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 157, 35))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 157, 31))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 28))
+>this : Symbol(this, Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 157, 35))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 13))
+
+        options.findIndex(function (val, index) {
+>options.findIndex : Symbol(Array.findIndex, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 152, 10))
+>findIndex : Symbol(Array.findIndex, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 161, 36))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 161, 40))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 161, 36))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 28))
+>this : Symbol(this, Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 161, 40))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 13))
+
+        options.forEach(function (val, index) {
+>options.forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 152, 10))
+>forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 165, 34))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 165, 38))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 165, 34))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 165, 38))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 13))
+
+        options.map(function (val, index) {
+>options.map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 152, 10))
+>map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 169, 30))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 169, 34))
+
+            if (val === this.options[index])
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 169, 30))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 169, 34))
+
+                return this.options[index];
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 169, 34))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 13))
+
+        options.some(function (val, index) {
+>options.some : Symbol(Array.some, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 152, 10))
+>some : Symbol(Array.some, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 174, 31))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 174, 35))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 174, 31))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 174, 35))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 13))
+
+        options.filter(function (val, index) {
+>options.filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 152, 10))
+>filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 178, 33))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 178, 37))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 178, 33))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 178, 37))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 13))
+
+        options.every(function (val, index) {
+>options.every : Symbol(Array.every, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 152, 10))
+>every : Symbol(Array.every, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 182, 32))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 182, 36))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 182, 32))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 182, 36))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 153, 13))
+    }
+
+    test4(options: Float32Array[]) {
+>test4 : Symbol(A.test4, Decl(thisTypeInNativeThisAssignableMethods.ts, 185, 5))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 187, 10))
+>Float32Array : Symbol(Float32Array, Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+
+        const thisObject = {
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 13))
+
+            options: [] as Float32Array[]
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 28))
+>Float32Array : Symbol(Float32Array, Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+
+        };
+
+        options.find(function (val, index) {
+>options.find : Symbol(Array.find, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 187, 10))
+>find : Symbol(Array.find, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 192, 31))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 192, 35))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 192, 31))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 28))
+>this : Symbol(this, Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 192, 35))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 13))
+
+        options.findIndex(function (val, index) {
+>options.findIndex : Symbol(Array.findIndex, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 187, 10))
+>findIndex : Symbol(Array.findIndex, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 196, 36))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 196, 40))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 196, 36))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 28))
+>this : Symbol(this, Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 196, 40))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 13))
+
+        options.forEach(function (val, index) {
+>options.forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 187, 10))
+>forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 200, 34))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 200, 38))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 200, 34))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 200, 38))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 13))
+
+        options.map(function (val, index) {
+>options.map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 187, 10))
+>map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 204, 30))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 204, 34))
+
+            if (val === this.options[index])
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 204, 30))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 204, 34))
+
+                return this.options[index];
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 204, 34))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 13))
+
+        options.some(function (val, index) {
+>options.some : Symbol(Array.some, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 187, 10))
+>some : Symbol(Array.some, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 209, 31))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 209, 35))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 209, 31))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 209, 35))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 13))
+
+        options.filter(function (val, index) {
+>options.filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 187, 10))
+>filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 213, 33))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 213, 37))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 213, 33))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 213, 37))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 13))
+
+        options.every(function (val, index) {
+>options.every : Symbol(Array.every, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 187, 10))
+>every : Symbol(Array.every, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 217, 32))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 217, 36))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 217, 32))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 217, 36))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 188, 13))
+    }
+
+    test5(options: Uint8ClampedArray[]) {
+>test5 : Symbol(A.test5, Decl(thisTypeInNativeThisAssignableMethods.ts, 220, 5))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 222, 10))
+>Uint8ClampedArray : Symbol(Uint8ClampedArray, Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+
+        const thisObject = {
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 13))
+
+            options: [] as Uint8ClampedArray[]
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 28))
+>Uint8ClampedArray : Symbol(Uint8ClampedArray, Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+
+        };
+
+        options.find(function (val, index) {
+>options.find : Symbol(Array.find, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 222, 10))
+>find : Symbol(Array.find, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 227, 31))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 227, 35))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 227, 31))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 28))
+>this : Symbol(this, Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 227, 35))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 13))
+
+        options.findIndex(function (val, index) {
+>options.findIndex : Symbol(Array.findIndex, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 222, 10))
+>findIndex : Symbol(Array.findIndex, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 231, 36))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 231, 40))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 231, 36))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 28))
+>this : Symbol(this, Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 231, 40))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 13))
+
+        options.forEach(function (val, index) {
+>options.forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 222, 10))
+>forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 235, 34))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 235, 38))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 235, 34))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 235, 38))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 13))
+
+        options.map(function (val, index) {
+>options.map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 222, 10))
+>map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 239, 30))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 239, 34))
+
+            if (val === this.options[index])
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 239, 30))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 239, 34))
+
+                return this.options[index];
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 239, 34))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 13))
+
+        options.some(function (val, index) {
+>options.some : Symbol(Array.some, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 222, 10))
+>some : Symbol(Array.some, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 244, 31))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 244, 35))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 244, 31))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 244, 35))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 13))
+
+        options.filter(function (val, index) {
+>options.filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 222, 10))
+>filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 248, 33))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 248, 37))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 248, 33))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 248, 37))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 13))
+
+        options.every(function (val, index) {
+>options.every : Symbol(Array.every, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 222, 10))
+>every : Symbol(Array.every, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 252, 32))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 252, 36))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 252, 32))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 252, 36))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 223, 13))
+    }
+
+    test6(options: Int16Array[]) {
+>test6 : Symbol(A.test6, Decl(thisTypeInNativeThisAssignableMethods.ts, 255, 5))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 257, 10))
+>Int16Array : Symbol(Int16Array, Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+
+        const thisObject = {
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 13))
+
+            options: [] as Int16Array[]
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 28))
+>Int16Array : Symbol(Int16Array, Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+
+        };
+
+        options.find(function (val, index) {
+>options.find : Symbol(Array.find, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 257, 10))
+>find : Symbol(Array.find, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 262, 31))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 262, 35))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 262, 31))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 28))
+>this : Symbol(this, Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 262, 35))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 13))
+
+        options.findIndex(function (val, index) {
+>options.findIndex : Symbol(Array.findIndex, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 257, 10))
+>findIndex : Symbol(Array.findIndex, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 266, 36))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 266, 40))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 266, 36))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 28))
+>this : Symbol(this, Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 266, 40))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 13))
+
+        options.forEach(function (val, index) {
+>options.forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 257, 10))
+>forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 270, 34))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 270, 38))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 270, 34))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 270, 38))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 13))
+
+        options.map(function (val, index) {
+>options.map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 257, 10))
+>map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 274, 30))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 274, 34))
+
+            if (val === this.options[index])
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 274, 30))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 274, 34))
+
+                return this.options[index];
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 274, 34))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 13))
+
+        options.some(function (val, index) {
+>options.some : Symbol(Array.some, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 257, 10))
+>some : Symbol(Array.some, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 279, 31))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 279, 35))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 279, 31))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 279, 35))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 13))
+
+        options.filter(function (val, index) {
+>options.filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 257, 10))
+>filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 283, 33))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 283, 37))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 283, 33))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 283, 37))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 13))
+
+        options.every(function (val, index) {
+>options.every : Symbol(Array.every, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 257, 10))
+>every : Symbol(Array.every, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 287, 32))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 287, 36))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 287, 32))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 287, 36))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 258, 13))
+    }
+
+    test7(options: Uint16Array[]) {
+>test7 : Symbol(A.test7, Decl(thisTypeInNativeThisAssignableMethods.ts, 290, 5))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 292, 10))
+>Uint16Array : Symbol(Uint16Array, Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+
+        const thisObject = {
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 13))
+
+            options: [] as Uint16Array[]
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 28))
+>Uint16Array : Symbol(Uint16Array, Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+
+        };
+
+        options.find(function (val, index) {
+>options.find : Symbol(Array.find, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 292, 10))
+>find : Symbol(Array.find, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 297, 31))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 297, 35))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 297, 31))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 28))
+>this : Symbol(this, Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 297, 35))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 13))
+
+        options.findIndex(function (val, index) {
+>options.findIndex : Symbol(Array.findIndex, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 292, 10))
+>findIndex : Symbol(Array.findIndex, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 301, 36))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 301, 40))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 301, 36))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 28))
+>this : Symbol(this, Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 301, 40))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 13))
+
+        options.forEach(function (val, index) {
+>options.forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 292, 10))
+>forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 305, 34))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 305, 38))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 305, 34))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 305, 38))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 13))
+
+        options.map(function (val, index) {
+>options.map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 292, 10))
+>map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 309, 30))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 309, 34))
+
+            if (val === this.options[index])
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 309, 30))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 309, 34))
+
+                return this.options[index];
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 309, 34))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 13))
+
+        options.some(function (val, index) {
+>options.some : Symbol(Array.some, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 292, 10))
+>some : Symbol(Array.some, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 314, 31))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 314, 35))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 314, 31))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 314, 35))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 13))
+
+        options.filter(function (val, index) {
+>options.filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 292, 10))
+>filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 318, 33))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 318, 37))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 318, 33))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 318, 37))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 13))
+
+        options.every(function (val, index) {
+>options.every : Symbol(Array.every, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 292, 10))
+>every : Symbol(Array.every, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 322, 32))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 322, 36))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 322, 32))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 322, 36))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 293, 13))
+    }
+
+    test8(options: Uint32Array[]) {
+>test8 : Symbol(A.test8, Decl(thisTypeInNativeThisAssignableMethods.ts, 325, 5))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 327, 10))
+>Uint32Array : Symbol(Uint32Array, Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+
+        const thisObject = {
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 13))
+
+            options: [] as Uint32Array[]
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 28))
+>Uint32Array : Symbol(Uint32Array, Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+
+        };
+
+        options.find(function (val, index) {
+>options.find : Symbol(Array.find, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 327, 10))
+>find : Symbol(Array.find, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 332, 31))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 332, 35))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 332, 31))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 28))
+>this : Symbol(this, Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 332, 35))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 13))
+
+        options.findIndex(function (val, index) {
+>options.findIndex : Symbol(Array.findIndex, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 327, 10))
+>findIndex : Symbol(Array.findIndex, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 336, 36))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 336, 40))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 336, 36))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 28))
+>this : Symbol(this, Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 336, 40))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 13))
+
+        options.forEach(function (val, index) {
+>options.forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 327, 10))
+>forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 340, 34))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 340, 38))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 340, 34))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 340, 38))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 13))
+
+        options.map(function (val, index) {
+>options.map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 327, 10))
+>map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 344, 30))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 344, 34))
+
+            if (val === this.options[index])
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 344, 30))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 344, 34))
+
+                return this.options[index];
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 344, 34))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 13))
+
+        options.some(function (val, index) {
+>options.some : Symbol(Array.some, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 327, 10))
+>some : Symbol(Array.some, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 349, 31))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 349, 35))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 349, 31))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 349, 35))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 13))
+
+        options.filter(function (val, index) {
+>options.filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 327, 10))
+>filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 353, 33))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 353, 37))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 353, 33))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 353, 37))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 13))
+
+        options.every(function (val, index) {
+>options.every : Symbol(Array.every, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 327, 10))
+>every : Symbol(Array.every, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 357, 32))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 357, 36))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 357, 32))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 357, 36))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 328, 13))
+    }
+
+    test9(options: Float64Array[]) {
+>test9 : Symbol(A.test9, Decl(thisTypeInNativeThisAssignableMethods.ts, 360, 5))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 362, 10))
+>Float64Array : Symbol(Float64Array, Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+
+        const thisObject = {
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 13))
+
+            options: [] as Float64Array[]
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 28))
+>Float64Array : Symbol(Float64Array, Decl(lib.es2016.array.include.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+
+        };
+
+        options.find(function (val, index) {
+>options.find : Symbol(Array.find, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 362, 10))
+>find : Symbol(Array.find, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 367, 31))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 367, 35))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 367, 31))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 28))
+>this : Symbol(this, Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 367, 35))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 13))
+
+        options.findIndex(function (val, index) {
+>options.findIndex : Symbol(Array.findIndex, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 362, 10))
+>findIndex : Symbol(Array.findIndex, Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --), Decl(lib.es2015.core.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 371, 36))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 371, 40))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 371, 36))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 28))
+>this : Symbol(this, Decl(lib.es2015.core.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 371, 40))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 13))
+
+        options.forEach(function (val, index) {
+>options.forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 362, 10))
+>forEach : Symbol(Array.forEach, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 375, 34))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 375, 38))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 375, 34))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 375, 38))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 13))
+
+        options.map(function (val, index) {
+>options.map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 362, 10))
+>map : Symbol(Array.map, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 379, 30))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 379, 34))
+
+            if (val === this.options[index])
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 379, 30))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 379, 34))
+
+                return this.options[index];
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 379, 34))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 13))
+
+        options.some(function (val, index) {
+>options.some : Symbol(Array.some, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 362, 10))
+>some : Symbol(Array.some, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 384, 31))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 384, 35))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 384, 31))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 384, 35))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 13))
+
+        options.filter(function (val, index) {
+>options.filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 362, 10))
+>filter : Symbol(Array.filter, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 388, 33))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 388, 37))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 388, 33))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 388, 37))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 13))
+
+        options.every(function (val, index) {
+>options.every : Symbol(Array.every, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 362, 10))
+>every : Symbol(Array.every, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --))
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 392, 32))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 392, 36))
+
+            return val === this.options[index];
+>val : Symbol(val, Decl(thisTypeInNativeThisAssignableMethods.ts, 392, 32))
+>this.options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 28))
+>this : Symbol(this, Decl(lib.es5.d.ts, --, --))
+>options : Symbol(options, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 28))
+>index : Symbol(index, Decl(thisTypeInNativeThisAssignableMethods.ts, 392, 36))
+
+        }, thisObject);
+>thisObject : Symbol(thisObject, Decl(thisTypeInNativeThisAssignableMethods.ts, 363, 13))
+    }
+}
+
diff --git a/tests/baselines/reference/thisTypeInNativeThisAssignableMethods.types b/tests/baselines/reference/thisTypeInNativeThisAssignableMethods.types
new file mode 100644
index 00000000000..e64918181ca
--- /dev/null
+++ b/tests/baselines/reference/thisTypeInNativeThisAssignableMethods.types
@@ -0,0 +1,1932 @@
+=== tests/cases/compiler/thisTypeInNativeThisAssignableMethods.ts ===
+
+class A {
+>A : A
+
+    options: string[];
+>options : string[]
+
+    addOptions(options: string[]) {
+>addOptions : (options: string[]) => this
+>options : string[]
+
+        if (!this.options) {
+>!this.options : boolean
+>this.options : string[]
+>this : this
+>options : string[]
+
+            this.options = [];
+>this.options = [] : undefined[]
+>this.options : string[]
+>this : this
+>options : string[]
+>[] : undefined[]
+        }
+        options.forEach(function (item) {
+>options.forEach(function (item) {            this.options.push(item);        }, this) : void
+>options.forEach : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void): void; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => void, thisArg: Z): void; }
+>options : string[]
+>forEach : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void): void; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => void, thisArg: Z): void; }
+>function (item) {            this.options.push(item);        } : (this: this, item: string) => void
+>item : string
+
+            this.options.push(item);
+>this.options.push(item) : number
+>this.options.push : (...items: string[]) => number
+>this.options : string[]
+>this : this
+>options : string[]
+>push : (...items: string[]) => number
+>item : string
+
+        }, this);
+>this : this
+
+        return this;
+>this : this
+    }
+
+    testUndefined(options: string[]) {
+>testUndefined : (options: string[]) => void
+>options : string[]
+
+        const undefinedArr: Array<undefined> = []
+>undefinedArr : undefined[]
+>Array : T[]
+>[] : undefined[]
+
+        options.forEach(function () {
+>options.forEach(function () {            undefinedArr.push(this);        }) : void
+>options.forEach : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void): void; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => void, thisArg: Z): void; }
+>options : string[]
+>forEach : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void): void; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => void, thisArg: Z): void; }
+>function () {            undefinedArr.push(this);        } : (this: undefined) => void
+
+            undefinedArr.push(this);
+>undefinedArr.push(this) : number
+>undefinedArr.push : (...items: undefined[]) => number
+>undefinedArr : undefined[]
+>push : (...items: undefined[]) => number
+>this : undefined
+
+        }); // case1
+        options.forEach(function () {
+>options.forEach(function () {            undefinedArr.push(this);        }, undefined) : void
+>options.forEach : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void): void; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => void, thisArg: Z): void; }
+>options : string[]
+>forEach : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void): void; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => void, thisArg: Z): void; }
+>function () {            undefinedArr.push(this);        } : (this: undefined) => void
+
+            undefinedArr.push(this);
+>undefinedArr.push(this) : number
+>undefinedArr.push : (...items: undefined[]) => number
+>undefinedArr : undefined[]
+>push : (...items: undefined[]) => number
+>this : undefined
+
+        }, undefined); // case2
+>undefined : undefined
+
+        options.forEach(function () {
+>options.forEach(function () {            undefinedArr.push(this);        }, null) : void
+>options.forEach : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void): void; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => void, thisArg: Z): void; }
+>options : string[]
+>forEach : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void): void; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => void, thisArg: Z): void; }
+>function () {            undefinedArr.push(this);        } : (this: undefined) => void
+
+            undefinedArr.push(this);
+>undefinedArr.push(this) : number
+>undefinedArr.push : (...items: undefined[]) => number
+>undefinedArr : undefined[]
+>push : (...items: undefined[]) => number
+>this : undefined
+
+        }, null); // case3
+>null : null
+
+        const arrLike = {} as ArrayLike<number>
+>arrLike : ArrayLike<number>
+>{} as ArrayLike<number> : ArrayLike<number>
+>{} : {}
+>ArrayLike : ArrayLike<T>
+
+        Array.from(arrLike, function (item) {
+>Array.from(arrLike, function (item) {            return this === undefined ? 2 : 1;        }, undefined) : (2 | 1)[]
+>Array.from : { <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(iterable: Iterable<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(iterable: Iterable<T>): T[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(arrayLike: ArrayLike<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
+>Array : ArrayConstructor
+>from : { <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(iterable: Iterable<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(iterable: Iterable<T>): T[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(arrayLike: ArrayLike<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
+>arrLike : ArrayLike<number>
+>function (item) {            return this === undefined ? 2 : 1;        } : (this: undefined, item: number) => 2 | 1
+>item : number
+
+            return this === undefined ? 2 : 1;
+>this === undefined ? 2 : 1 : 2 | 1
+>this === undefined : boolean
+>this : undefined
+>undefined : undefined
+>2 : 2
+>1 : 1
+
+        }, undefined)
+>undefined : undefined
+
+        const iterLike = [] as Iterable<number>
+>iterLike : Iterable<number>
+>[] as Iterable<number> : Iterable<number>
+>[] : undefined[]
+>Iterable : Iterable<T>
+
+        Array.from(iterLike, function (item) {
+>Array.from(iterLike, function (item) {            return this === undefined ? 2 : 1;        }, undefined) : (2 | 1)[]
+>Array.from : { <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(iterable: Iterable<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(iterable: Iterable<T>): T[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(arrayLike: ArrayLike<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
+>Array : ArrayConstructor
+>from : { <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(iterable: Iterable<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(iterable: Iterable<T>): T[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(arrayLike: ArrayLike<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
+>iterLike : Iterable<number>
+>function (item) {            return this === undefined ? 2 : 1;        } : (this: undefined, item: number) => 2 | 1
+>item : number
+
+            return this === undefined ? 2 : 1;
+>this === undefined ? 2 : 1 : 2 | 1
+>this === undefined : boolean
+>this : undefined
+>undefined : undefined
+>2 : 2
+>1 : 1
+
+        }, undefined)
+>undefined : undefined
+    }
+
+    test(options: string[]) {
+>test : (options: string[]) => void
+>options : string[]
+
+        const thisObject = {
+>thisObject : { options: string[]; }
+>{            options: [] as string[]        } : { options: string[]; }
+
+            options: [] as string[]
+>options : string[]
+>[] as string[] : string[]
+>[] : undefined[]
+
+        };
+
+        options.find(function (val, index) {
+>options.find(function (val, index) {            return val === this.options[index];        }, thisObject) : string
+>options.find : { (predicate: (this: undefined, value: string, index: number, obj: string[]) => boolean): string; (predicate: (this: undefined, value: string, index: number, obj: string[]) => boolean, thisArg: undefined): string; <Z>(predicate: (this: Z, value: string, index: number, obj: string[]) => boolean, thisArg: Z): string; }
+>options : string[]
+>find : { (predicate: (this: undefined, value: string, index: number, obj: string[]) => boolean): string; (predicate: (this: undefined, value: string, index: number, obj: string[]) => boolean, thisArg: undefined): string; <Z>(predicate: (this: Z, value: string, index: number, obj: string[]) => boolean, thisArg: Z): string; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: string[]; }, val: string, index: number) => boolean
+>val : string
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : string
+>this.options[index] : string
+>this.options : string[]
+>this : { options: string[]; }
+>options : string[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: string[]; }
+
+        options.findIndex(function (val, index) {
+>options.findIndex(function (val, index) {            return val === this.options[index];        }, thisObject) : number
+>options.findIndex : { (predicate: (this: undefined, value: string, index: number, obj: string[]) => boolean): number; (predicate: (this: undefined, value: string, index: number, obj: string[]) => boolean, thisArg: undefined): number; <Z>(predicate: (this: Z, value: string, index: number, obj: string[]) => boolean, thisArg: Z): number; }
+>options : string[]
+>findIndex : { (predicate: (this: undefined, value: string, index: number, obj: string[]) => boolean): number; (predicate: (this: undefined, value: string, index: number, obj: string[]) => boolean, thisArg: undefined): number; <Z>(predicate: (this: Z, value: string, index: number, obj: string[]) => boolean, thisArg: Z): number; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: string[]; }, val: string, index: number) => boolean
+>val : string
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : string
+>this.options[index] : string
+>this.options : string[]
+>this : { options: string[]; }
+>options : string[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: string[]; }
+
+        options.forEach(function (val, index) {
+>options.forEach(function (val, index) {            return val === this.options[index];        }, thisObject) : void
+>options.forEach : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void): void; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => void, thisArg: Z): void; }
+>options : string[]
+>forEach : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void): void; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => void, thisArg: Z): void; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: string[]; }, val: string, index: number) => boolean
+>val : string
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : string
+>this.options[index] : string
+>this.options : string[]
+>this : { options: string[]; }
+>options : string[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: string[]; }
+
+        options.map(function (val, index) {
+>options.map(function (val, index) {            if (val === this.options[index])                return this.options[index];        }, thisObject) : string[]
+>options.map : { <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U, U]; <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [string, string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): U[]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): U[]; }
+>options : string[]
+>map : { <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U, U]; <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [string, string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): U[]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): U[]; }
+>function (val, index) {            if (val === this.options[index])                return this.options[index];        } : (this: { options: string[]; }, val: string, index: number) => string
+>val : string
+>index : number
+
+            if (val === this.options[index])
+>val === this.options[index] : boolean
+>val : string
+>this.options[index] : string
+>this.options : string[]
+>this : { options: string[]; }
+>options : string[]
+>index : number
+
+                return this.options[index];
+>this.options[index] : string
+>this.options : string[]
+>this : { options: string[]; }
+>options : string[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: string[]; }
+
+        options.some(function (val, index) {
+>options.some(function (val, index) {            return val === this.options[index];        }, thisObject) : boolean
+>options.some : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => boolean): boolean; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => boolean, thisArg: Z): boolean; }
+>options : string[]
+>some : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => boolean): boolean; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => boolean, thisArg: Z): boolean; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: string[]; }, val: string, index: number) => boolean
+>val : string
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : string
+>this.options[index] : string
+>this.options : string[]
+>this : { options: string[]; }
+>options : string[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: string[]; }
+
+        options.filter(function (val, index) {
+>options.filter(function (val, index) {            return val === this.options[index];        }, thisObject) : string[]
+>options.filter : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => any): string[]; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => any, thisArg: undefined): string[]; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => any, thisArg: Z): string[]; }
+>options : string[]
+>filter : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => any): string[]; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => any, thisArg: undefined): string[]; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => any, thisArg: Z): string[]; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: string[]; }, val: string, index: number) => boolean
+>val : string
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : string
+>this.options[index] : string
+>this.options : string[]
+>this : { options: string[]; }
+>options : string[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: string[]; }
+
+        options.every(function (val, index) {
+>options.every(function (val, index) {            return val === this.options[index];        }, thisObject) : boolean
+>options.every : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => boolean): boolean; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => boolean, thisArg: Z): boolean; }
+>options : string[]
+>every : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => boolean): boolean; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => boolean, thisArg: Z): boolean; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: string[]; }, val: string, index: number) => boolean
+>val : string
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : string
+>this.options[index] : string
+>this.options : string[]
+>this : { options: string[]; }
+>options : string[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: string[]; }
+
+        const arrLike = {} as ArrayLike<number>
+>arrLike : ArrayLike<number>
+>{} as ArrayLike<number> : ArrayLike<number>
+>{} : {}
+>ArrayLike : ArrayLike<T>
+
+        Array.from(arrLike, function (item) {
+>Array.from(arrLike, function (item) {            return this.options[item].length        }, thisObject) : number[]
+>Array.from : { <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(iterable: Iterable<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(iterable: Iterable<T>): T[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(arrayLike: ArrayLike<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
+>Array : ArrayConstructor
+>from : { <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(iterable: Iterable<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(iterable: Iterable<T>): T[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(arrayLike: ArrayLike<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
+>arrLike : ArrayLike<number>
+>function (item) {            return this.options[item].length        } : (this: { options: string[]; }, item: number) => number
+>item : number
+
+            return this.options[item].length
+>this.options[item].length : number
+>this.options[item] : string
+>this.options : string[]
+>this : { options: string[]; }
+>options : string[]
+>item : number
+>length : number
+
+        }, thisObject)
+>thisObject : { options: string[]; }
+
+        const iterLike = [] as Iterable<number>
+>iterLike : Iterable<number>
+>[] as Iterable<number> : Iterable<number>
+>[] : undefined[]
+>Iterable : Iterable<T>
+
+        Array.from(iterLike, function (item) {
+>Array.from(iterLike, function (item) {            return this.options[item].length        }, thisObject) : number[]
+>Array.from : { <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(iterable: Iterable<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(iterable: Iterable<T>): T[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(arrayLike: ArrayLike<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
+>Array : ArrayConstructor
+>from : { <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(iterable: Iterable<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(iterable: Iterable<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(iterable: Iterable<T>): T[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U): U[]; <T, U>(arrayLike: ArrayLike<T>, mapfn: (this: undefined, v: T, k: number) => U, thisArg: undefined): U[]; <Z, T, U>(arrayLike: ArrayLike<T>, mapfn: (this: Z, v: T, k: number) => U, thisArg: Z): U[]; <T>(arrayLike: ArrayLike<T>): T[]; }
+>iterLike : Iterable<number>
+>function (item) {            return this.options[item].length        } : (this: { options: string[]; }, item: number) => number
+>item : number
+
+            return this.options[item].length
+>this.options[item].length : number
+>this.options[item] : string
+>this.options : string[]
+>this : { options: string[]; }
+>options : string[]
+>item : number
+>length : number
+
+        }, thisObject)
+>thisObject : { options: string[]; }
+    }
+
+    test1(options: string[]) {
+>test1 : (options: string[]) => void
+>options : string[]
+
+        const thisObject = {
+>thisObject : { options: ReadonlyArray<string>; }
+>{            options: [] as ReadonlyArray<string>        } : { options: ReadonlyArray<string>; }
+
+            options: [] as ReadonlyArray<string>
+>options : ReadonlyArray<string>
+>[] as ReadonlyArray<string> : ReadonlyArray<string>
+>[] : undefined[]
+>ReadonlyArray : ReadonlyArray<T>
+
+        };
+
+        options.find(function (val, index) {
+>options.find(function (val, index) {            return val === this.options[index];        }, thisObject) : string
+>options.find : { (predicate: (this: undefined, value: string, index: number, obj: string[]) => boolean): string; (predicate: (this: undefined, value: string, index: number, obj: string[]) => boolean, thisArg: undefined): string; <Z>(predicate: (this: Z, value: string, index: number, obj: string[]) => boolean, thisArg: Z): string; }
+>options : string[]
+>find : { (predicate: (this: undefined, value: string, index: number, obj: string[]) => boolean): string; (predicate: (this: undefined, value: string, index: number, obj: string[]) => boolean, thisArg: undefined): string; <Z>(predicate: (this: Z, value: string, index: number, obj: string[]) => boolean, thisArg: Z): string; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: ReadonlyArray<string>; }, val: string, index: number) => boolean
+>val : string
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : string
+>this.options[index] : string
+>this.options : ReadonlyArray<string>
+>this : { options: ReadonlyArray<string>; }
+>options : ReadonlyArray<string>
+>index : number
+
+        }, thisObject);
+>thisObject : { options: ReadonlyArray<string>; }
+
+        options.findIndex(function (val, index) {
+>options.findIndex(function (val, index) {            return val === this.options[index];        }, thisObject) : number
+>options.findIndex : { (predicate: (this: undefined, value: string, index: number, obj: string[]) => boolean): number; (predicate: (this: undefined, value: string, index: number, obj: string[]) => boolean, thisArg: undefined): number; <Z>(predicate: (this: Z, value: string, index: number, obj: string[]) => boolean, thisArg: Z): number; }
+>options : string[]
+>findIndex : { (predicate: (this: undefined, value: string, index: number, obj: string[]) => boolean): number; (predicate: (this: undefined, value: string, index: number, obj: string[]) => boolean, thisArg: undefined): number; <Z>(predicate: (this: Z, value: string, index: number, obj: string[]) => boolean, thisArg: Z): number; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: ReadonlyArray<string>; }, val: string, index: number) => boolean
+>val : string
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : string
+>this.options[index] : string
+>this.options : ReadonlyArray<string>
+>this : { options: ReadonlyArray<string>; }
+>options : ReadonlyArray<string>
+>index : number
+
+        }, thisObject);
+>thisObject : { options: ReadonlyArray<string>; }
+
+        options.forEach(function (val, index) {
+>options.forEach(function (val, index) {            return val === this.options[index];        }, thisObject) : void
+>options.forEach : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void): void; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => void, thisArg: Z): void; }
+>options : string[]
+>forEach : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void): void; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => void, thisArg: Z): void; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: ReadonlyArray<string>; }, val: string, index: number) => boolean
+>val : string
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : string
+>this.options[index] : string
+>this.options : ReadonlyArray<string>
+>this : { options: ReadonlyArray<string>; }
+>options : ReadonlyArray<string>
+>index : number
+
+        }, thisObject);
+>thisObject : { options: ReadonlyArray<string>; }
+
+        options.map(function (val, index) {
+>options.map(function (val, index) {            if (val === this.options[index])                return this.options[index];        }, thisObject) : string[]
+>options.map : { <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U, U]; <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [string, string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): U[]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): U[]; }
+>options : string[]
+>map : { <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U, U]; <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [string, string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U]; <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U]; <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U]; <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): U[]; <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): U[]; }
+>function (val, index) {            if (val === this.options[index])                return this.options[index];        } : (this: { options: ReadonlyArray<string>; }, val: string, index: number) => string
+>val : string
+>index : number
+
+            if (val === this.options[index])
+>val === this.options[index] : boolean
+>val : string
+>this.options[index] : string
+>this.options : ReadonlyArray<string>
+>this : { options: ReadonlyArray<string>; }
+>options : ReadonlyArray<string>
+>index : number
+
+                return this.options[index];
+>this.options[index] : string
+>this.options : ReadonlyArray<string>
+>this : { options: ReadonlyArray<string>; }
+>options : ReadonlyArray<string>
+>index : number
+
+        }, thisObject);
+>thisObject : { options: ReadonlyArray<string>; }
+
+        options.some(function (val, index) {
+>options.some(function (val, index) {            return val === this.options[index];        }, thisObject) : boolean
+>options.some : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => boolean): boolean; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => boolean, thisArg: Z): boolean; }
+>options : string[]
+>some : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => boolean): boolean; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => boolean, thisArg: Z): boolean; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: ReadonlyArray<string>; }, val: string, index: number) => boolean
+>val : string
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : string
+>this.options[index] : string
+>this.options : ReadonlyArray<string>
+>this : { options: ReadonlyArray<string>; }
+>options : ReadonlyArray<string>
+>index : number
+
+        }, thisObject);
+>thisObject : { options: ReadonlyArray<string>; }
+
+        options.filter(function (val, index) {
+>options.filter(function (val, index) {            return val === this.options[index];        }, thisObject) : string[]
+>options.filter : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => any): string[]; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => any, thisArg: undefined): string[]; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => any, thisArg: Z): string[]; }
+>options : string[]
+>filter : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => any): string[]; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => any, thisArg: undefined): string[]; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => any, thisArg: Z): string[]; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: ReadonlyArray<string>; }, val: string, index: number) => boolean
+>val : string
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : string
+>this.options[index] : string
+>this.options : ReadonlyArray<string>
+>this : { options: ReadonlyArray<string>; }
+>options : ReadonlyArray<string>
+>index : number
+
+        }, thisObject);
+>thisObject : { options: ReadonlyArray<string>; }
+
+        options.every(function (val, index) {
+>options.every(function (val, index) {            return val === this.options[index];        }, thisObject) : boolean
+>options.every : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => boolean): boolean; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => boolean, thisArg: Z): boolean; }
+>options : string[]
+>every : { (callbackfn: (this: undefined, value: string, index: number, array: string[]) => boolean): boolean; (callbackfn: (this: undefined, value: string, index: number, array: string[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: string, index: number, array: string[]) => boolean, thisArg: Z): boolean; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: ReadonlyArray<string>; }, val: string, index: number) => boolean
+>val : string
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : string
+>this.options[index] : string
+>this.options : ReadonlyArray<string>
+>this : { options: ReadonlyArray<string>; }
+>options : ReadonlyArray<string>
+>index : number
+
+        }, thisObject);
+>thisObject : { options: ReadonlyArray<string>; }
+    }
+
+    test2(options: Int8Array[]) {
+>test2 : (options: Int8Array[]) => void
+>options : Int8Array[]
+>Int8Array : Int8Array
+
+        const thisObject = {
+>thisObject : { options: Int8Array[]; }
+>{            options: [] as Int8Array[]        } : { options: Int8Array[]; }
+
+            options: [] as Int8Array[]
+>options : Int8Array[]
+>[] as Int8Array[] : Int8Array[]
+>[] : undefined[]
+>Int8Array : Int8Array
+
+        };
+
+        options.find(function (val, index) {
+>options.find(function (val, index) {            return val === this.options[index];        }, thisObject) : Int8Array
+>options.find : { (predicate: (this: undefined, value: Int8Array, index: number, obj: Int8Array[]) => boolean): Int8Array; (predicate: (this: undefined, value: Int8Array, index: number, obj: Int8Array[]) => boolean, thisArg: undefined): Int8Array; <Z>(predicate: (this: Z, value: Int8Array, index: number, obj: Int8Array[]) => boolean, thisArg: Z): Int8Array; }
+>options : Int8Array[]
+>find : { (predicate: (this: undefined, value: Int8Array, index: number, obj: Int8Array[]) => boolean): Int8Array; (predicate: (this: undefined, value: Int8Array, index: number, obj: Int8Array[]) => boolean, thisArg: undefined): Int8Array; <Z>(predicate: (this: Z, value: Int8Array, index: number, obj: Int8Array[]) => boolean, thisArg: Z): Int8Array; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Int8Array[]; }, val: Int8Array, index: number) => boolean
+>val : Int8Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Int8Array
+>this.options[index] : Int8Array
+>this.options : Int8Array[]
+>this : { options: Int8Array[]; }
+>options : Int8Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Int8Array[]; }
+
+        options.findIndex(function (val, index) {
+>options.findIndex(function (val, index) {            return val === this.options[index];        }, thisObject) : number
+>options.findIndex : { (predicate: (this: undefined, value: Int8Array, index: number, obj: Int8Array[]) => boolean): number; (predicate: (this: undefined, value: Int8Array, index: number, obj: Int8Array[]) => boolean, thisArg: undefined): number; <Z>(predicate: (this: Z, value: Int8Array, index: number, obj: Int8Array[]) => boolean, thisArg: Z): number; }
+>options : Int8Array[]
+>findIndex : { (predicate: (this: undefined, value: Int8Array, index: number, obj: Int8Array[]) => boolean): number; (predicate: (this: undefined, value: Int8Array, index: number, obj: Int8Array[]) => boolean, thisArg: undefined): number; <Z>(predicate: (this: Z, value: Int8Array, index: number, obj: Int8Array[]) => boolean, thisArg: Z): number; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Int8Array[]; }, val: Int8Array, index: number) => boolean
+>val : Int8Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Int8Array
+>this.options[index] : Int8Array
+>this.options : Int8Array[]
+>this : { options: Int8Array[]; }
+>options : Int8Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Int8Array[]; }
+
+        options.forEach(function (val, index) {
+>options.forEach(function (val, index) {            return val === this.options[index];        }, thisObject) : void
+>options.forEach : { (callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => void): void; (callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: Int8Array, index: number, array: Int8Array[]) => void, thisArg: Z): void; }
+>options : Int8Array[]
+>forEach : { (callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => void): void; (callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: Int8Array, index: number, array: Int8Array[]) => void, thisArg: Z): void; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Int8Array[]; }, val: Int8Array, index: number) => boolean
+>val : Int8Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Int8Array
+>this.options[index] : Int8Array
+>this.options : Int8Array[]
+>this : { options: Int8Array[]; }
+>options : Int8Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Int8Array[]; }
+
+        options.map(function (val, index) {
+>options.map(function (val, index) {            if (val === this.options[index])                return this.options[index];        }, thisObject) : Int8Array[]
+>options.map : { <U>(this: [Int8Array, Int8Array, Int8Array, Int8Array, Int8Array], callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => U): [U, U, U, U, U]; <U>(this: [Int8Array, Int8Array, Int8Array, Int8Array, Int8Array], callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [Int8Array, Int8Array, Int8Array, Int8Array, Int8Array], callbackfn: (this: Z, value: Int8Array, index: number, array: Int8Array[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [Int8Array, Int8Array, Int8Array, Int8Array], callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => U): [U, U, U, U]; <U>(this: [Int8Array, Int8Array, Int8Array, Int8Array], callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [Int8Array, Int8Array, Int8Array, Int8Array], callbackfn: (this: Z, value: Int8Array, index: number, array: Int8Array[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [Int8Array, Int8Array, Int8Array], callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => U): [U, U, U]; <U>(this: [Int8Array, Int8Array, Int8Array], callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [Int8Array, Int8Array, Int8Array], callbackfn: (this: Z, value: Int8Array, index: number, array: Int8Array[]) => U, thisArg: Z): [U, U, U]; <U>(this: [Int8Array, Int8Array], callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => U): [U, U]; <U>(this: [Int8Array, Int8Array], callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [Int8Array, Int8Array], callbackfn: (this: Z, value: Int8Array, index: number, array: Int8Array[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => U): U[]; <U>(callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: Int8Array, index: number, array: Int8Array[]) => U, thisArg: Z): U[]; }
+>options : Int8Array[]
+>map : { <U>(this: [Int8Array, Int8Array, Int8Array, Int8Array, Int8Array], callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => U): [U, U, U, U, U]; <U>(this: [Int8Array, Int8Array, Int8Array, Int8Array, Int8Array], callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [Int8Array, Int8Array, Int8Array, Int8Array, Int8Array], callbackfn: (this: Z, value: Int8Array, index: number, array: Int8Array[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [Int8Array, Int8Array, Int8Array, Int8Array], callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => U): [U, U, U, U]; <U>(this: [Int8Array, Int8Array, Int8Array, Int8Array], callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [Int8Array, Int8Array, Int8Array, Int8Array], callbackfn: (this: Z, value: Int8Array, index: number, array: Int8Array[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [Int8Array, Int8Array, Int8Array], callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => U): [U, U, U]; <U>(this: [Int8Array, Int8Array, Int8Array], callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [Int8Array, Int8Array, Int8Array], callbackfn: (this: Z, value: Int8Array, index: number, array: Int8Array[]) => U, thisArg: Z): [U, U, U]; <U>(this: [Int8Array, Int8Array], callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => U): [U, U]; <U>(this: [Int8Array, Int8Array], callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [Int8Array, Int8Array], callbackfn: (this: Z, value: Int8Array, index: number, array: Int8Array[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => U): U[]; <U>(callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: Int8Array, index: number, array: Int8Array[]) => U, thisArg: Z): U[]; }
+>function (val, index) {            if (val === this.options[index])                return this.options[index];        } : (this: { options: Int8Array[]; }, val: Int8Array, index: number) => Int8Array
+>val : Int8Array
+>index : number
+
+            if (val === this.options[index])
+>val === this.options[index] : boolean
+>val : Int8Array
+>this.options[index] : Int8Array
+>this.options : Int8Array[]
+>this : { options: Int8Array[]; }
+>options : Int8Array[]
+>index : number
+
+                return this.options[index];
+>this.options[index] : Int8Array
+>this.options : Int8Array[]
+>this : { options: Int8Array[]; }
+>options : Int8Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Int8Array[]; }
+
+        options.some(function (val, index) {
+>options.some(function (val, index) {            return val === this.options[index];        }, thisObject) : boolean
+>options.some : { (callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Int8Array, index: number, array: Int8Array[]) => boolean, thisArg: Z): boolean; }
+>options : Int8Array[]
+>some : { (callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Int8Array, index: number, array: Int8Array[]) => boolean, thisArg: Z): boolean; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Int8Array[]; }, val: Int8Array, index: number) => boolean
+>val : Int8Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Int8Array
+>this.options[index] : Int8Array
+>this.options : Int8Array[]
+>this : { options: Int8Array[]; }
+>options : Int8Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Int8Array[]; }
+
+        options.filter(function (val, index) {
+>options.filter(function (val, index) {            return val === this.options[index];        }, thisObject) : Int8Array[]
+>options.filter : { (callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => any): Int8Array[]; (callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => any, thisArg: undefined): Int8Array[]; <Z>(callbackfn: (this: Z, value: Int8Array, index: number, array: Int8Array[]) => any, thisArg: Z): Int8Array[]; }
+>options : Int8Array[]
+>filter : { (callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => any): Int8Array[]; (callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => any, thisArg: undefined): Int8Array[]; <Z>(callbackfn: (this: Z, value: Int8Array, index: number, array: Int8Array[]) => any, thisArg: Z): Int8Array[]; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Int8Array[]; }, val: Int8Array, index: number) => boolean
+>val : Int8Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Int8Array
+>this.options[index] : Int8Array
+>this.options : Int8Array[]
+>this : { options: Int8Array[]; }
+>options : Int8Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Int8Array[]; }
+
+        options.every(function (val, index) {
+>options.every(function (val, index) {            return val === this.options[index];        }, thisObject) : boolean
+>options.every : { (callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Int8Array, index: number, array: Int8Array[]) => boolean, thisArg: Z): boolean; }
+>options : Int8Array[]
+>every : { (callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Int8Array, index: number, array: Int8Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Int8Array, index: number, array: Int8Array[]) => boolean, thisArg: Z): boolean; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Int8Array[]; }, val: Int8Array, index: number) => boolean
+>val : Int8Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Int8Array
+>this.options[index] : Int8Array
+>this.options : Int8Array[]
+>this : { options: Int8Array[]; }
+>options : Int8Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Int8Array[]; }
+    }
+
+    test3(options: Uint8Array[]) {
+>test3 : (options: Uint8Array[]) => void
+>options : Uint8Array[]
+>Uint8Array : Uint8Array
+
+        const thisObject = {
+>thisObject : { options: Uint8Array[]; }
+>{            options: [] as Uint8Array[]        } : { options: Uint8Array[]; }
+
+            options: [] as Uint8Array[]
+>options : Uint8Array[]
+>[] as Uint8Array[] : Uint8Array[]
+>[] : undefined[]
+>Uint8Array : Uint8Array
+
+        };
+
+        options.find(function (val, index) {
+>options.find(function (val, index) {            return val === this.options[index];        }, thisObject) : Uint8Array
+>options.find : { (predicate: (this: undefined, value: Uint8Array, index: number, obj: Uint8Array[]) => boolean): Uint8Array; (predicate: (this: undefined, value: Uint8Array, index: number, obj: Uint8Array[]) => boolean, thisArg: undefined): Uint8Array; <Z>(predicate: (this: Z, value: Uint8Array, index: number, obj: Uint8Array[]) => boolean, thisArg: Z): Uint8Array; }
+>options : Uint8Array[]
+>find : { (predicate: (this: undefined, value: Uint8Array, index: number, obj: Uint8Array[]) => boolean): Uint8Array; (predicate: (this: undefined, value: Uint8Array, index: number, obj: Uint8Array[]) => boolean, thisArg: undefined): Uint8Array; <Z>(predicate: (this: Z, value: Uint8Array, index: number, obj: Uint8Array[]) => boolean, thisArg: Z): Uint8Array; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Uint8Array[]; }, val: Uint8Array, index: number) => boolean
+>val : Uint8Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Uint8Array
+>this.options[index] : Uint8Array
+>this.options : Uint8Array[]
+>this : { options: Uint8Array[]; }
+>options : Uint8Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint8Array[]; }
+
+        options.findIndex(function (val, index) {
+>options.findIndex(function (val, index) {            return val === this.options[index];        }, thisObject) : number
+>options.findIndex : { (predicate: (this: undefined, value: Uint8Array, index: number, obj: Uint8Array[]) => boolean): number; (predicate: (this: undefined, value: Uint8Array, index: number, obj: Uint8Array[]) => boolean, thisArg: undefined): number; <Z>(predicate: (this: Z, value: Uint8Array, index: number, obj: Uint8Array[]) => boolean, thisArg: Z): number; }
+>options : Uint8Array[]
+>findIndex : { (predicate: (this: undefined, value: Uint8Array, index: number, obj: Uint8Array[]) => boolean): number; (predicate: (this: undefined, value: Uint8Array, index: number, obj: Uint8Array[]) => boolean, thisArg: undefined): number; <Z>(predicate: (this: Z, value: Uint8Array, index: number, obj: Uint8Array[]) => boolean, thisArg: Z): number; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Uint8Array[]; }, val: Uint8Array, index: number) => boolean
+>val : Uint8Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Uint8Array
+>this.options[index] : Uint8Array
+>this.options : Uint8Array[]
+>this : { options: Uint8Array[]; }
+>options : Uint8Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint8Array[]; }
+
+        options.forEach(function (val, index) {
+>options.forEach(function (val, index) {            return val === this.options[index];        }, thisObject) : void
+>options.forEach : { (callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => void): void; (callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: Uint8Array, index: number, array: Uint8Array[]) => void, thisArg: Z): void; }
+>options : Uint8Array[]
+>forEach : { (callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => void): void; (callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: Uint8Array, index: number, array: Uint8Array[]) => void, thisArg: Z): void; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Uint8Array[]; }, val: Uint8Array, index: number) => boolean
+>val : Uint8Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Uint8Array
+>this.options[index] : Uint8Array
+>this.options : Uint8Array[]
+>this : { options: Uint8Array[]; }
+>options : Uint8Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint8Array[]; }
+
+        options.map(function (val, index) {
+>options.map(function (val, index) {            if (val === this.options[index])                return this.options[index];        }, thisObject) : Uint8Array[]
+>options.map : { <U>(this: [Uint8Array, Uint8Array, Uint8Array, Uint8Array, Uint8Array], callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => U): [U, U, U, U, U]; <U>(this: [Uint8Array, Uint8Array, Uint8Array, Uint8Array, Uint8Array], callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [Uint8Array, Uint8Array, Uint8Array, Uint8Array, Uint8Array], callbackfn: (this: Z, value: Uint8Array, index: number, array: Uint8Array[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [Uint8Array, Uint8Array, Uint8Array, Uint8Array], callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => U): [U, U, U, U]; <U>(this: [Uint8Array, Uint8Array, Uint8Array, Uint8Array], callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [Uint8Array, Uint8Array, Uint8Array, Uint8Array], callbackfn: (this: Z, value: Uint8Array, index: number, array: Uint8Array[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [Uint8Array, Uint8Array, Uint8Array], callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => U): [U, U, U]; <U>(this: [Uint8Array, Uint8Array, Uint8Array], callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [Uint8Array, Uint8Array, Uint8Array], callbackfn: (this: Z, value: Uint8Array, index: number, array: Uint8Array[]) => U, thisArg: Z): [U, U, U]; <U>(this: [Uint8Array, Uint8Array], callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => U): [U, U]; <U>(this: [Uint8Array, Uint8Array], callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [Uint8Array, Uint8Array], callbackfn: (this: Z, value: Uint8Array, index: number, array: Uint8Array[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => U): U[]; <U>(callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: Uint8Array, index: number, array: Uint8Array[]) => U, thisArg: Z): U[]; }
+>options : Uint8Array[]
+>map : { <U>(this: [Uint8Array, Uint8Array, Uint8Array, Uint8Array, Uint8Array], callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => U): [U, U, U, U, U]; <U>(this: [Uint8Array, Uint8Array, Uint8Array, Uint8Array, Uint8Array], callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [Uint8Array, Uint8Array, Uint8Array, Uint8Array, Uint8Array], callbackfn: (this: Z, value: Uint8Array, index: number, array: Uint8Array[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [Uint8Array, Uint8Array, Uint8Array, Uint8Array], callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => U): [U, U, U, U]; <U>(this: [Uint8Array, Uint8Array, Uint8Array, Uint8Array], callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [Uint8Array, Uint8Array, Uint8Array, Uint8Array], callbackfn: (this: Z, value: Uint8Array, index: number, array: Uint8Array[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [Uint8Array, Uint8Array, Uint8Array], callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => U): [U, U, U]; <U>(this: [Uint8Array, Uint8Array, Uint8Array], callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [Uint8Array, Uint8Array, Uint8Array], callbackfn: (this: Z, value: Uint8Array, index: number, array: Uint8Array[]) => U, thisArg: Z): [U, U, U]; <U>(this: [Uint8Array, Uint8Array], callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => U): [U, U]; <U>(this: [Uint8Array, Uint8Array], callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [Uint8Array, Uint8Array], callbackfn: (this: Z, value: Uint8Array, index: number, array: Uint8Array[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => U): U[]; <U>(callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: Uint8Array, index: number, array: Uint8Array[]) => U, thisArg: Z): U[]; }
+>function (val, index) {            if (val === this.options[index])                return this.options[index];        } : (this: { options: Uint8Array[]; }, val: Uint8Array, index: number) => Uint8Array
+>val : Uint8Array
+>index : number
+
+            if (val === this.options[index])
+>val === this.options[index] : boolean
+>val : Uint8Array
+>this.options[index] : Uint8Array
+>this.options : Uint8Array[]
+>this : { options: Uint8Array[]; }
+>options : Uint8Array[]
+>index : number
+
+                return this.options[index];
+>this.options[index] : Uint8Array
+>this.options : Uint8Array[]
+>this : { options: Uint8Array[]; }
+>options : Uint8Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint8Array[]; }
+
+        options.some(function (val, index) {
+>options.some(function (val, index) {            return val === this.options[index];        }, thisObject) : boolean
+>options.some : { (callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Uint8Array, index: number, array: Uint8Array[]) => boolean, thisArg: Z): boolean; }
+>options : Uint8Array[]
+>some : { (callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Uint8Array, index: number, array: Uint8Array[]) => boolean, thisArg: Z): boolean; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Uint8Array[]; }, val: Uint8Array, index: number) => boolean
+>val : Uint8Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Uint8Array
+>this.options[index] : Uint8Array
+>this.options : Uint8Array[]
+>this : { options: Uint8Array[]; }
+>options : Uint8Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint8Array[]; }
+
+        options.filter(function (val, index) {
+>options.filter(function (val, index) {            return val === this.options[index];        }, thisObject) : Uint8Array[]
+>options.filter : { (callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => any): Uint8Array[]; (callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => any, thisArg: undefined): Uint8Array[]; <Z>(callbackfn: (this: Z, value: Uint8Array, index: number, array: Uint8Array[]) => any, thisArg: Z): Uint8Array[]; }
+>options : Uint8Array[]
+>filter : { (callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => any): Uint8Array[]; (callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => any, thisArg: undefined): Uint8Array[]; <Z>(callbackfn: (this: Z, value: Uint8Array, index: number, array: Uint8Array[]) => any, thisArg: Z): Uint8Array[]; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Uint8Array[]; }, val: Uint8Array, index: number) => boolean
+>val : Uint8Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Uint8Array
+>this.options[index] : Uint8Array
+>this.options : Uint8Array[]
+>this : { options: Uint8Array[]; }
+>options : Uint8Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint8Array[]; }
+
+        options.every(function (val, index) {
+>options.every(function (val, index) {            return val === this.options[index];        }, thisObject) : boolean
+>options.every : { (callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Uint8Array, index: number, array: Uint8Array[]) => boolean, thisArg: Z): boolean; }
+>options : Uint8Array[]
+>every : { (callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Uint8Array, index: number, array: Uint8Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Uint8Array, index: number, array: Uint8Array[]) => boolean, thisArg: Z): boolean; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Uint8Array[]; }, val: Uint8Array, index: number) => boolean
+>val : Uint8Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Uint8Array
+>this.options[index] : Uint8Array
+>this.options : Uint8Array[]
+>this : { options: Uint8Array[]; }
+>options : Uint8Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint8Array[]; }
+    }
+
+    test4(options: Float32Array[]) {
+>test4 : (options: Float32Array[]) => void
+>options : Float32Array[]
+>Float32Array : Float32Array
+
+        const thisObject = {
+>thisObject : { options: Float32Array[]; }
+>{            options: [] as Float32Array[]        } : { options: Float32Array[]; }
+
+            options: [] as Float32Array[]
+>options : Float32Array[]
+>[] as Float32Array[] : Float32Array[]
+>[] : undefined[]
+>Float32Array : Float32Array
+
+        };
+
+        options.find(function (val, index) {
+>options.find(function (val, index) {            return val === this.options[index];        }, thisObject) : Float32Array
+>options.find : { (predicate: (this: undefined, value: Float32Array, index: number, obj: Float32Array[]) => boolean): Float32Array; (predicate: (this: undefined, value: Float32Array, index: number, obj: Float32Array[]) => boolean, thisArg: undefined): Float32Array; <Z>(predicate: (this: Z, value: Float32Array, index: number, obj: Float32Array[]) => boolean, thisArg: Z): Float32Array; }
+>options : Float32Array[]
+>find : { (predicate: (this: undefined, value: Float32Array, index: number, obj: Float32Array[]) => boolean): Float32Array; (predicate: (this: undefined, value: Float32Array, index: number, obj: Float32Array[]) => boolean, thisArg: undefined): Float32Array; <Z>(predicate: (this: Z, value: Float32Array, index: number, obj: Float32Array[]) => boolean, thisArg: Z): Float32Array; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Float32Array[]; }, val: Float32Array, index: number) => boolean
+>val : Float32Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Float32Array
+>this.options[index] : Float32Array
+>this.options : Float32Array[]
+>this : { options: Float32Array[]; }
+>options : Float32Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Float32Array[]; }
+
+        options.findIndex(function (val, index) {
+>options.findIndex(function (val, index) {            return val === this.options[index];        }, thisObject) : number
+>options.findIndex : { (predicate: (this: undefined, value: Float32Array, index: number, obj: Float32Array[]) => boolean): number; (predicate: (this: undefined, value: Float32Array, index: number, obj: Float32Array[]) => boolean, thisArg: undefined): number; <Z>(predicate: (this: Z, value: Float32Array, index: number, obj: Float32Array[]) => boolean, thisArg: Z): number; }
+>options : Float32Array[]
+>findIndex : { (predicate: (this: undefined, value: Float32Array, index: number, obj: Float32Array[]) => boolean): number; (predicate: (this: undefined, value: Float32Array, index: number, obj: Float32Array[]) => boolean, thisArg: undefined): number; <Z>(predicate: (this: Z, value: Float32Array, index: number, obj: Float32Array[]) => boolean, thisArg: Z): number; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Float32Array[]; }, val: Float32Array, index: number) => boolean
+>val : Float32Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Float32Array
+>this.options[index] : Float32Array
+>this.options : Float32Array[]
+>this : { options: Float32Array[]; }
+>options : Float32Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Float32Array[]; }
+
+        options.forEach(function (val, index) {
+>options.forEach(function (val, index) {            return val === this.options[index];        }, thisObject) : void
+>options.forEach : { (callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => void): void; (callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: Float32Array, index: number, array: Float32Array[]) => void, thisArg: Z): void; }
+>options : Float32Array[]
+>forEach : { (callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => void): void; (callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: Float32Array, index: number, array: Float32Array[]) => void, thisArg: Z): void; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Float32Array[]; }, val: Float32Array, index: number) => boolean
+>val : Float32Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Float32Array
+>this.options[index] : Float32Array
+>this.options : Float32Array[]
+>this : { options: Float32Array[]; }
+>options : Float32Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Float32Array[]; }
+
+        options.map(function (val, index) {
+>options.map(function (val, index) {            if (val === this.options[index])                return this.options[index];        }, thisObject) : Float32Array[]
+>options.map : { <U>(this: [Float32Array, Float32Array, Float32Array, Float32Array, Float32Array], callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => U): [U, U, U, U, U]; <U>(this: [Float32Array, Float32Array, Float32Array, Float32Array, Float32Array], callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [Float32Array, Float32Array, Float32Array, Float32Array, Float32Array], callbackfn: (this: Z, value: Float32Array, index: number, array: Float32Array[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [Float32Array, Float32Array, Float32Array, Float32Array], callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => U): [U, U, U, U]; <U>(this: [Float32Array, Float32Array, Float32Array, Float32Array], callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [Float32Array, Float32Array, Float32Array, Float32Array], callbackfn: (this: Z, value: Float32Array, index: number, array: Float32Array[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [Float32Array, Float32Array, Float32Array], callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => U): [U, U, U]; <U>(this: [Float32Array, Float32Array, Float32Array], callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [Float32Array, Float32Array, Float32Array], callbackfn: (this: Z, value: Float32Array, index: number, array: Float32Array[]) => U, thisArg: Z): [U, U, U]; <U>(this: [Float32Array, Float32Array], callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => U): [U, U]; <U>(this: [Float32Array, Float32Array], callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [Float32Array, Float32Array], callbackfn: (this: Z, value: Float32Array, index: number, array: Float32Array[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => U): U[]; <U>(callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: Float32Array, index: number, array: Float32Array[]) => U, thisArg: Z): U[]; }
+>options : Float32Array[]
+>map : { <U>(this: [Float32Array, Float32Array, Float32Array, Float32Array, Float32Array], callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => U): [U, U, U, U, U]; <U>(this: [Float32Array, Float32Array, Float32Array, Float32Array, Float32Array], callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [Float32Array, Float32Array, Float32Array, Float32Array, Float32Array], callbackfn: (this: Z, value: Float32Array, index: number, array: Float32Array[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [Float32Array, Float32Array, Float32Array, Float32Array], callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => U): [U, U, U, U]; <U>(this: [Float32Array, Float32Array, Float32Array, Float32Array], callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [Float32Array, Float32Array, Float32Array, Float32Array], callbackfn: (this: Z, value: Float32Array, index: number, array: Float32Array[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [Float32Array, Float32Array, Float32Array], callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => U): [U, U, U]; <U>(this: [Float32Array, Float32Array, Float32Array], callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [Float32Array, Float32Array, Float32Array], callbackfn: (this: Z, value: Float32Array, index: number, array: Float32Array[]) => U, thisArg: Z): [U, U, U]; <U>(this: [Float32Array, Float32Array], callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => U): [U, U]; <U>(this: [Float32Array, Float32Array], callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [Float32Array, Float32Array], callbackfn: (this: Z, value: Float32Array, index: number, array: Float32Array[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => U): U[]; <U>(callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: Float32Array, index: number, array: Float32Array[]) => U, thisArg: Z): U[]; }
+>function (val, index) {            if (val === this.options[index])                return this.options[index];        } : (this: { options: Float32Array[]; }, val: Float32Array, index: number) => Float32Array
+>val : Float32Array
+>index : number
+
+            if (val === this.options[index])
+>val === this.options[index] : boolean
+>val : Float32Array
+>this.options[index] : Float32Array
+>this.options : Float32Array[]
+>this : { options: Float32Array[]; }
+>options : Float32Array[]
+>index : number
+
+                return this.options[index];
+>this.options[index] : Float32Array
+>this.options : Float32Array[]
+>this : { options: Float32Array[]; }
+>options : Float32Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Float32Array[]; }
+
+        options.some(function (val, index) {
+>options.some(function (val, index) {            return val === this.options[index];        }, thisObject) : boolean
+>options.some : { (callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Float32Array, index: number, array: Float32Array[]) => boolean, thisArg: Z): boolean; }
+>options : Float32Array[]
+>some : { (callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Float32Array, index: number, array: Float32Array[]) => boolean, thisArg: Z): boolean; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Float32Array[]; }, val: Float32Array, index: number) => boolean
+>val : Float32Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Float32Array
+>this.options[index] : Float32Array
+>this.options : Float32Array[]
+>this : { options: Float32Array[]; }
+>options : Float32Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Float32Array[]; }
+
+        options.filter(function (val, index) {
+>options.filter(function (val, index) {            return val === this.options[index];        }, thisObject) : Float32Array[]
+>options.filter : { (callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => any): Float32Array[]; (callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => any, thisArg: undefined): Float32Array[]; <Z>(callbackfn: (this: Z, value: Float32Array, index: number, array: Float32Array[]) => any, thisArg: Z): Float32Array[]; }
+>options : Float32Array[]
+>filter : { (callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => any): Float32Array[]; (callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => any, thisArg: undefined): Float32Array[]; <Z>(callbackfn: (this: Z, value: Float32Array, index: number, array: Float32Array[]) => any, thisArg: Z): Float32Array[]; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Float32Array[]; }, val: Float32Array, index: number) => boolean
+>val : Float32Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Float32Array
+>this.options[index] : Float32Array
+>this.options : Float32Array[]
+>this : { options: Float32Array[]; }
+>options : Float32Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Float32Array[]; }
+
+        options.every(function (val, index) {
+>options.every(function (val, index) {            return val === this.options[index];        }, thisObject) : boolean
+>options.every : { (callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Float32Array, index: number, array: Float32Array[]) => boolean, thisArg: Z): boolean; }
+>options : Float32Array[]
+>every : { (callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Float32Array, index: number, array: Float32Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Float32Array, index: number, array: Float32Array[]) => boolean, thisArg: Z): boolean; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Float32Array[]; }, val: Float32Array, index: number) => boolean
+>val : Float32Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Float32Array
+>this.options[index] : Float32Array
+>this.options : Float32Array[]
+>this : { options: Float32Array[]; }
+>options : Float32Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Float32Array[]; }
+    }
+
+    test5(options: Uint8ClampedArray[]) {
+>test5 : (options: Uint8ClampedArray[]) => void
+>options : Uint8ClampedArray[]
+>Uint8ClampedArray : Uint8ClampedArray
+
+        const thisObject = {
+>thisObject : { options: Uint8ClampedArray[]; }
+>{            options: [] as Uint8ClampedArray[]        } : { options: Uint8ClampedArray[]; }
+
+            options: [] as Uint8ClampedArray[]
+>options : Uint8ClampedArray[]
+>[] as Uint8ClampedArray[] : Uint8ClampedArray[]
+>[] : undefined[]
+>Uint8ClampedArray : Uint8ClampedArray
+
+        };
+
+        options.find(function (val, index) {
+>options.find(function (val, index) {            return val === this.options[index];        }, thisObject) : Uint8ClampedArray
+>options.find : { (predicate: (this: undefined, value: Uint8ClampedArray, index: number, obj: Uint8ClampedArray[]) => boolean): Uint8ClampedArray; (predicate: (this: undefined, value: Uint8ClampedArray, index: number, obj: Uint8ClampedArray[]) => boolean, thisArg: undefined): Uint8ClampedArray; <Z>(predicate: (this: Z, value: Uint8ClampedArray, index: number, obj: Uint8ClampedArray[]) => boolean, thisArg: Z): Uint8ClampedArray; }
+>options : Uint8ClampedArray[]
+>find : { (predicate: (this: undefined, value: Uint8ClampedArray, index: number, obj: Uint8ClampedArray[]) => boolean): Uint8ClampedArray; (predicate: (this: undefined, value: Uint8ClampedArray, index: number, obj: Uint8ClampedArray[]) => boolean, thisArg: undefined): Uint8ClampedArray; <Z>(predicate: (this: Z, value: Uint8ClampedArray, index: number, obj: Uint8ClampedArray[]) => boolean, thisArg: Z): Uint8ClampedArray; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Uint8ClampedArray[]; }, val: Uint8ClampedArray, index: number) => boolean
+>val : Uint8ClampedArray
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Uint8ClampedArray
+>this.options[index] : Uint8ClampedArray
+>this.options : Uint8ClampedArray[]
+>this : { options: Uint8ClampedArray[]; }
+>options : Uint8ClampedArray[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint8ClampedArray[]; }
+
+        options.findIndex(function (val, index) {
+>options.findIndex(function (val, index) {            return val === this.options[index];        }, thisObject) : number
+>options.findIndex : { (predicate: (this: undefined, value: Uint8ClampedArray, index: number, obj: Uint8ClampedArray[]) => boolean): number; (predicate: (this: undefined, value: Uint8ClampedArray, index: number, obj: Uint8ClampedArray[]) => boolean, thisArg: undefined): number; <Z>(predicate: (this: Z, value: Uint8ClampedArray, index: number, obj: Uint8ClampedArray[]) => boolean, thisArg: Z): number; }
+>options : Uint8ClampedArray[]
+>findIndex : { (predicate: (this: undefined, value: Uint8ClampedArray, index: number, obj: Uint8ClampedArray[]) => boolean): number; (predicate: (this: undefined, value: Uint8ClampedArray, index: number, obj: Uint8ClampedArray[]) => boolean, thisArg: undefined): number; <Z>(predicate: (this: Z, value: Uint8ClampedArray, index: number, obj: Uint8ClampedArray[]) => boolean, thisArg: Z): number; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Uint8ClampedArray[]; }, val: Uint8ClampedArray, index: number) => boolean
+>val : Uint8ClampedArray
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Uint8ClampedArray
+>this.options[index] : Uint8ClampedArray
+>this.options : Uint8ClampedArray[]
+>this : { options: Uint8ClampedArray[]; }
+>options : Uint8ClampedArray[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint8ClampedArray[]; }
+
+        options.forEach(function (val, index) {
+>options.forEach(function (val, index) {            return val === this.options[index];        }, thisObject) : void
+>options.forEach : { (callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => void): void; (callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => void, thisArg: Z): void; }
+>options : Uint8ClampedArray[]
+>forEach : { (callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => void): void; (callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => void, thisArg: Z): void; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Uint8ClampedArray[]; }, val: Uint8ClampedArray, index: number) => boolean
+>val : Uint8ClampedArray
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Uint8ClampedArray
+>this.options[index] : Uint8ClampedArray
+>this.options : Uint8ClampedArray[]
+>this : { options: Uint8ClampedArray[]; }
+>options : Uint8ClampedArray[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint8ClampedArray[]; }
+
+        options.map(function (val, index) {
+>options.map(function (val, index) {            if (val === this.options[index])                return this.options[index];        }, thisObject) : Uint8ClampedArray[]
+>options.map : { <U>(this: [Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray], callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U): [U, U, U, U, U]; <U>(this: [Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray], callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray], callbackfn: (this: Z, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray], callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U): [U, U, U, U]; <U>(this: [Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray], callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray], callbackfn: (this: Z, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray], callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U): [U, U, U]; <U>(this: [Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray], callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray], callbackfn: (this: Z, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U, thisArg: Z): [U, U, U]; <U>(this: [Uint8ClampedArray, Uint8ClampedArray], callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U): [U, U]; <U>(this: [Uint8ClampedArray, Uint8ClampedArray], callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [Uint8ClampedArray, Uint8ClampedArray], callbackfn: (this: Z, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U): U[]; <U>(callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U, thisArg: Z): U[]; }
+>options : Uint8ClampedArray[]
+>map : { <U>(this: [Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray], callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U): [U, U, U, U, U]; <U>(this: [Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray], callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray], callbackfn: (this: Z, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray], callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U): [U, U, U, U]; <U>(this: [Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray], callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray], callbackfn: (this: Z, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray], callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U): [U, U, U]; <U>(this: [Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray], callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [Uint8ClampedArray, Uint8ClampedArray, Uint8ClampedArray], callbackfn: (this: Z, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U, thisArg: Z): [U, U, U]; <U>(this: [Uint8ClampedArray, Uint8ClampedArray], callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U): [U, U]; <U>(this: [Uint8ClampedArray, Uint8ClampedArray], callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [Uint8ClampedArray, Uint8ClampedArray], callbackfn: (this: Z, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U): U[]; <U>(callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => U, thisArg: Z): U[]; }
+>function (val, index) {            if (val === this.options[index])                return this.options[index];        } : (this: { options: Uint8ClampedArray[]; }, val: Uint8ClampedArray, index: number) => Uint8ClampedArray
+>val : Uint8ClampedArray
+>index : number
+
+            if (val === this.options[index])
+>val === this.options[index] : boolean
+>val : Uint8ClampedArray
+>this.options[index] : Uint8ClampedArray
+>this.options : Uint8ClampedArray[]
+>this : { options: Uint8ClampedArray[]; }
+>options : Uint8ClampedArray[]
+>index : number
+
+                return this.options[index];
+>this.options[index] : Uint8ClampedArray
+>this.options : Uint8ClampedArray[]
+>this : { options: Uint8ClampedArray[]; }
+>options : Uint8ClampedArray[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint8ClampedArray[]; }
+
+        options.some(function (val, index) {
+>options.some(function (val, index) {            return val === this.options[index];        }, thisObject) : boolean
+>options.some : { (callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => boolean): boolean; (callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => boolean, thisArg: Z): boolean; }
+>options : Uint8ClampedArray[]
+>some : { (callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => boolean): boolean; (callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => boolean, thisArg: Z): boolean; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Uint8ClampedArray[]; }, val: Uint8ClampedArray, index: number) => boolean
+>val : Uint8ClampedArray
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Uint8ClampedArray
+>this.options[index] : Uint8ClampedArray
+>this.options : Uint8ClampedArray[]
+>this : { options: Uint8ClampedArray[]; }
+>options : Uint8ClampedArray[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint8ClampedArray[]; }
+
+        options.filter(function (val, index) {
+>options.filter(function (val, index) {            return val === this.options[index];        }, thisObject) : Uint8ClampedArray[]
+>options.filter : { (callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => any): Uint8ClampedArray[]; (callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => any, thisArg: undefined): Uint8ClampedArray[]; <Z>(callbackfn: (this: Z, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => any, thisArg: Z): Uint8ClampedArray[]; }
+>options : Uint8ClampedArray[]
+>filter : { (callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => any): Uint8ClampedArray[]; (callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => any, thisArg: undefined): Uint8ClampedArray[]; <Z>(callbackfn: (this: Z, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => any, thisArg: Z): Uint8ClampedArray[]; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Uint8ClampedArray[]; }, val: Uint8ClampedArray, index: number) => boolean
+>val : Uint8ClampedArray
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Uint8ClampedArray
+>this.options[index] : Uint8ClampedArray
+>this.options : Uint8ClampedArray[]
+>this : { options: Uint8ClampedArray[]; }
+>options : Uint8ClampedArray[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint8ClampedArray[]; }
+
+        options.every(function (val, index) {
+>options.every(function (val, index) {            return val === this.options[index];        }, thisObject) : boolean
+>options.every : { (callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => boolean): boolean; (callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => boolean, thisArg: Z): boolean; }
+>options : Uint8ClampedArray[]
+>every : { (callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => boolean): boolean; (callbackfn: (this: undefined, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Uint8ClampedArray, index: number, array: Uint8ClampedArray[]) => boolean, thisArg: Z): boolean; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Uint8ClampedArray[]; }, val: Uint8ClampedArray, index: number) => boolean
+>val : Uint8ClampedArray
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Uint8ClampedArray
+>this.options[index] : Uint8ClampedArray
+>this.options : Uint8ClampedArray[]
+>this : { options: Uint8ClampedArray[]; }
+>options : Uint8ClampedArray[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint8ClampedArray[]; }
+    }
+
+    test6(options: Int16Array[]) {
+>test6 : (options: Int16Array[]) => void
+>options : Int16Array[]
+>Int16Array : Int16Array
+
+        const thisObject = {
+>thisObject : { options: Int16Array[]; }
+>{            options: [] as Int16Array[]        } : { options: Int16Array[]; }
+
+            options: [] as Int16Array[]
+>options : Int16Array[]
+>[] as Int16Array[] : Int16Array[]
+>[] : undefined[]
+>Int16Array : Int16Array
+
+        };
+
+        options.find(function (val, index) {
+>options.find(function (val, index) {            return val === this.options[index];        }, thisObject) : Int16Array
+>options.find : { (predicate: (this: undefined, value: Int16Array, index: number, obj: Int16Array[]) => boolean): Int16Array; (predicate: (this: undefined, value: Int16Array, index: number, obj: Int16Array[]) => boolean, thisArg: undefined): Int16Array; <Z>(predicate: (this: Z, value: Int16Array, index: number, obj: Int16Array[]) => boolean, thisArg: Z): Int16Array; }
+>options : Int16Array[]
+>find : { (predicate: (this: undefined, value: Int16Array, index: number, obj: Int16Array[]) => boolean): Int16Array; (predicate: (this: undefined, value: Int16Array, index: number, obj: Int16Array[]) => boolean, thisArg: undefined): Int16Array; <Z>(predicate: (this: Z, value: Int16Array, index: number, obj: Int16Array[]) => boolean, thisArg: Z): Int16Array; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Int16Array[]; }, val: Int16Array, index: number) => boolean
+>val : Int16Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Int16Array
+>this.options[index] : Int16Array
+>this.options : Int16Array[]
+>this : { options: Int16Array[]; }
+>options : Int16Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Int16Array[]; }
+
+        options.findIndex(function (val, index) {
+>options.findIndex(function (val, index) {            return val === this.options[index];        }, thisObject) : number
+>options.findIndex : { (predicate: (this: undefined, value: Int16Array, index: number, obj: Int16Array[]) => boolean): number; (predicate: (this: undefined, value: Int16Array, index: number, obj: Int16Array[]) => boolean, thisArg: undefined): number; <Z>(predicate: (this: Z, value: Int16Array, index: number, obj: Int16Array[]) => boolean, thisArg: Z): number; }
+>options : Int16Array[]
+>findIndex : { (predicate: (this: undefined, value: Int16Array, index: number, obj: Int16Array[]) => boolean): number; (predicate: (this: undefined, value: Int16Array, index: number, obj: Int16Array[]) => boolean, thisArg: undefined): number; <Z>(predicate: (this: Z, value: Int16Array, index: number, obj: Int16Array[]) => boolean, thisArg: Z): number; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Int16Array[]; }, val: Int16Array, index: number) => boolean
+>val : Int16Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Int16Array
+>this.options[index] : Int16Array
+>this.options : Int16Array[]
+>this : { options: Int16Array[]; }
+>options : Int16Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Int16Array[]; }
+
+        options.forEach(function (val, index) {
+>options.forEach(function (val, index) {            return val === this.options[index];        }, thisObject) : void
+>options.forEach : { (callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => void): void; (callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: Int16Array, index: number, array: Int16Array[]) => void, thisArg: Z): void; }
+>options : Int16Array[]
+>forEach : { (callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => void): void; (callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: Int16Array, index: number, array: Int16Array[]) => void, thisArg: Z): void; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Int16Array[]; }, val: Int16Array, index: number) => boolean
+>val : Int16Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Int16Array
+>this.options[index] : Int16Array
+>this.options : Int16Array[]
+>this : { options: Int16Array[]; }
+>options : Int16Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Int16Array[]; }
+
+        options.map(function (val, index) {
+>options.map(function (val, index) {            if (val === this.options[index])                return this.options[index];        }, thisObject) : Int16Array[]
+>options.map : { <U>(this: [Int16Array, Int16Array, Int16Array, Int16Array, Int16Array], callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => U): [U, U, U, U, U]; <U>(this: [Int16Array, Int16Array, Int16Array, Int16Array, Int16Array], callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [Int16Array, Int16Array, Int16Array, Int16Array, Int16Array], callbackfn: (this: Z, value: Int16Array, index: number, array: Int16Array[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [Int16Array, Int16Array, Int16Array, Int16Array], callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => U): [U, U, U, U]; <U>(this: [Int16Array, Int16Array, Int16Array, Int16Array], callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [Int16Array, Int16Array, Int16Array, Int16Array], callbackfn: (this: Z, value: Int16Array, index: number, array: Int16Array[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [Int16Array, Int16Array, Int16Array], callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => U): [U, U, U]; <U>(this: [Int16Array, Int16Array, Int16Array], callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [Int16Array, Int16Array, Int16Array], callbackfn: (this: Z, value: Int16Array, index: number, array: Int16Array[]) => U, thisArg: Z): [U, U, U]; <U>(this: [Int16Array, Int16Array], callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => U): [U, U]; <U>(this: [Int16Array, Int16Array], callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [Int16Array, Int16Array], callbackfn: (this: Z, value: Int16Array, index: number, array: Int16Array[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => U): U[]; <U>(callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: Int16Array, index: number, array: Int16Array[]) => U, thisArg: Z): U[]; }
+>options : Int16Array[]
+>map : { <U>(this: [Int16Array, Int16Array, Int16Array, Int16Array, Int16Array], callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => U): [U, U, U, U, U]; <U>(this: [Int16Array, Int16Array, Int16Array, Int16Array, Int16Array], callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [Int16Array, Int16Array, Int16Array, Int16Array, Int16Array], callbackfn: (this: Z, value: Int16Array, index: number, array: Int16Array[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [Int16Array, Int16Array, Int16Array, Int16Array], callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => U): [U, U, U, U]; <U>(this: [Int16Array, Int16Array, Int16Array, Int16Array], callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [Int16Array, Int16Array, Int16Array, Int16Array], callbackfn: (this: Z, value: Int16Array, index: number, array: Int16Array[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [Int16Array, Int16Array, Int16Array], callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => U): [U, U, U]; <U>(this: [Int16Array, Int16Array, Int16Array], callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [Int16Array, Int16Array, Int16Array], callbackfn: (this: Z, value: Int16Array, index: number, array: Int16Array[]) => U, thisArg: Z): [U, U, U]; <U>(this: [Int16Array, Int16Array], callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => U): [U, U]; <U>(this: [Int16Array, Int16Array], callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [Int16Array, Int16Array], callbackfn: (this: Z, value: Int16Array, index: number, array: Int16Array[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => U): U[]; <U>(callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: Int16Array, index: number, array: Int16Array[]) => U, thisArg: Z): U[]; }
+>function (val, index) {            if (val === this.options[index])                return this.options[index];        } : (this: { options: Int16Array[]; }, val: Int16Array, index: number) => Int16Array
+>val : Int16Array
+>index : number
+
+            if (val === this.options[index])
+>val === this.options[index] : boolean
+>val : Int16Array
+>this.options[index] : Int16Array
+>this.options : Int16Array[]
+>this : { options: Int16Array[]; }
+>options : Int16Array[]
+>index : number
+
+                return this.options[index];
+>this.options[index] : Int16Array
+>this.options : Int16Array[]
+>this : { options: Int16Array[]; }
+>options : Int16Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Int16Array[]; }
+
+        options.some(function (val, index) {
+>options.some(function (val, index) {            return val === this.options[index];        }, thisObject) : boolean
+>options.some : { (callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Int16Array, index: number, array: Int16Array[]) => boolean, thisArg: Z): boolean; }
+>options : Int16Array[]
+>some : { (callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Int16Array, index: number, array: Int16Array[]) => boolean, thisArg: Z): boolean; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Int16Array[]; }, val: Int16Array, index: number) => boolean
+>val : Int16Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Int16Array
+>this.options[index] : Int16Array
+>this.options : Int16Array[]
+>this : { options: Int16Array[]; }
+>options : Int16Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Int16Array[]; }
+
+        options.filter(function (val, index) {
+>options.filter(function (val, index) {            return val === this.options[index];        }, thisObject) : Int16Array[]
+>options.filter : { (callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => any): Int16Array[]; (callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => any, thisArg: undefined): Int16Array[]; <Z>(callbackfn: (this: Z, value: Int16Array, index: number, array: Int16Array[]) => any, thisArg: Z): Int16Array[]; }
+>options : Int16Array[]
+>filter : { (callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => any): Int16Array[]; (callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => any, thisArg: undefined): Int16Array[]; <Z>(callbackfn: (this: Z, value: Int16Array, index: number, array: Int16Array[]) => any, thisArg: Z): Int16Array[]; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Int16Array[]; }, val: Int16Array, index: number) => boolean
+>val : Int16Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Int16Array
+>this.options[index] : Int16Array
+>this.options : Int16Array[]
+>this : { options: Int16Array[]; }
+>options : Int16Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Int16Array[]; }
+
+        options.every(function (val, index) {
+>options.every(function (val, index) {            return val === this.options[index];        }, thisObject) : boolean
+>options.every : { (callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Int16Array, index: number, array: Int16Array[]) => boolean, thisArg: Z): boolean; }
+>options : Int16Array[]
+>every : { (callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Int16Array, index: number, array: Int16Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Int16Array, index: number, array: Int16Array[]) => boolean, thisArg: Z): boolean; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Int16Array[]; }, val: Int16Array, index: number) => boolean
+>val : Int16Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Int16Array
+>this.options[index] : Int16Array
+>this.options : Int16Array[]
+>this : { options: Int16Array[]; }
+>options : Int16Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Int16Array[]; }
+    }
+
+    test7(options: Uint16Array[]) {
+>test7 : (options: Uint16Array[]) => void
+>options : Uint16Array[]
+>Uint16Array : Uint16Array
+
+        const thisObject = {
+>thisObject : { options: Uint16Array[]; }
+>{            options: [] as Uint16Array[]        } : { options: Uint16Array[]; }
+
+            options: [] as Uint16Array[]
+>options : Uint16Array[]
+>[] as Uint16Array[] : Uint16Array[]
+>[] : undefined[]
+>Uint16Array : Uint16Array
+
+        };
+
+        options.find(function (val, index) {
+>options.find(function (val, index) {            return val === this.options[index];        }, thisObject) : Uint16Array
+>options.find : { (predicate: (this: undefined, value: Uint16Array, index: number, obj: Uint16Array[]) => boolean): Uint16Array; (predicate: (this: undefined, value: Uint16Array, index: number, obj: Uint16Array[]) => boolean, thisArg: undefined): Uint16Array; <Z>(predicate: (this: Z, value: Uint16Array, index: number, obj: Uint16Array[]) => boolean, thisArg: Z): Uint16Array; }
+>options : Uint16Array[]
+>find : { (predicate: (this: undefined, value: Uint16Array, index: number, obj: Uint16Array[]) => boolean): Uint16Array; (predicate: (this: undefined, value: Uint16Array, index: number, obj: Uint16Array[]) => boolean, thisArg: undefined): Uint16Array; <Z>(predicate: (this: Z, value: Uint16Array, index: number, obj: Uint16Array[]) => boolean, thisArg: Z): Uint16Array; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Uint16Array[]; }, val: Uint16Array, index: number) => boolean
+>val : Uint16Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Uint16Array
+>this.options[index] : Uint16Array
+>this.options : Uint16Array[]
+>this : { options: Uint16Array[]; }
+>options : Uint16Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint16Array[]; }
+
+        options.findIndex(function (val, index) {
+>options.findIndex(function (val, index) {            return val === this.options[index];        }, thisObject) : number
+>options.findIndex : { (predicate: (this: undefined, value: Uint16Array, index: number, obj: Uint16Array[]) => boolean): number; (predicate: (this: undefined, value: Uint16Array, index: number, obj: Uint16Array[]) => boolean, thisArg: undefined): number; <Z>(predicate: (this: Z, value: Uint16Array, index: number, obj: Uint16Array[]) => boolean, thisArg: Z): number; }
+>options : Uint16Array[]
+>findIndex : { (predicate: (this: undefined, value: Uint16Array, index: number, obj: Uint16Array[]) => boolean): number; (predicate: (this: undefined, value: Uint16Array, index: number, obj: Uint16Array[]) => boolean, thisArg: undefined): number; <Z>(predicate: (this: Z, value: Uint16Array, index: number, obj: Uint16Array[]) => boolean, thisArg: Z): number; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Uint16Array[]; }, val: Uint16Array, index: number) => boolean
+>val : Uint16Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Uint16Array
+>this.options[index] : Uint16Array
+>this.options : Uint16Array[]
+>this : { options: Uint16Array[]; }
+>options : Uint16Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint16Array[]; }
+
+        options.forEach(function (val, index) {
+>options.forEach(function (val, index) {            return val === this.options[index];        }, thisObject) : void
+>options.forEach : { (callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => void): void; (callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: Uint16Array, index: number, array: Uint16Array[]) => void, thisArg: Z): void; }
+>options : Uint16Array[]
+>forEach : { (callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => void): void; (callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: Uint16Array, index: number, array: Uint16Array[]) => void, thisArg: Z): void; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Uint16Array[]; }, val: Uint16Array, index: number) => boolean
+>val : Uint16Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Uint16Array
+>this.options[index] : Uint16Array
+>this.options : Uint16Array[]
+>this : { options: Uint16Array[]; }
+>options : Uint16Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint16Array[]; }
+
+        options.map(function (val, index) {
+>options.map(function (val, index) {            if (val === this.options[index])                return this.options[index];        }, thisObject) : Uint16Array[]
+>options.map : { <U>(this: [Uint16Array, Uint16Array, Uint16Array, Uint16Array, Uint16Array], callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => U): [U, U, U, U, U]; <U>(this: [Uint16Array, Uint16Array, Uint16Array, Uint16Array, Uint16Array], callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [Uint16Array, Uint16Array, Uint16Array, Uint16Array, Uint16Array], callbackfn: (this: Z, value: Uint16Array, index: number, array: Uint16Array[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [Uint16Array, Uint16Array, Uint16Array, Uint16Array], callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => U): [U, U, U, U]; <U>(this: [Uint16Array, Uint16Array, Uint16Array, Uint16Array], callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [Uint16Array, Uint16Array, Uint16Array, Uint16Array], callbackfn: (this: Z, value: Uint16Array, index: number, array: Uint16Array[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [Uint16Array, Uint16Array, Uint16Array], callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => U): [U, U, U]; <U>(this: [Uint16Array, Uint16Array, Uint16Array], callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [Uint16Array, Uint16Array, Uint16Array], callbackfn: (this: Z, value: Uint16Array, index: number, array: Uint16Array[]) => U, thisArg: Z): [U, U, U]; <U>(this: [Uint16Array, Uint16Array], callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => U): [U, U]; <U>(this: [Uint16Array, Uint16Array], callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [Uint16Array, Uint16Array], callbackfn: (this: Z, value: Uint16Array, index: number, array: Uint16Array[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => U): U[]; <U>(callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: Uint16Array, index: number, array: Uint16Array[]) => U, thisArg: Z): U[]; }
+>options : Uint16Array[]
+>map : { <U>(this: [Uint16Array, Uint16Array, Uint16Array, Uint16Array, Uint16Array], callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => U): [U, U, U, U, U]; <U>(this: [Uint16Array, Uint16Array, Uint16Array, Uint16Array, Uint16Array], callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [Uint16Array, Uint16Array, Uint16Array, Uint16Array, Uint16Array], callbackfn: (this: Z, value: Uint16Array, index: number, array: Uint16Array[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [Uint16Array, Uint16Array, Uint16Array, Uint16Array], callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => U): [U, U, U, U]; <U>(this: [Uint16Array, Uint16Array, Uint16Array, Uint16Array], callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [Uint16Array, Uint16Array, Uint16Array, Uint16Array], callbackfn: (this: Z, value: Uint16Array, index: number, array: Uint16Array[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [Uint16Array, Uint16Array, Uint16Array], callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => U): [U, U, U]; <U>(this: [Uint16Array, Uint16Array, Uint16Array], callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [Uint16Array, Uint16Array, Uint16Array], callbackfn: (this: Z, value: Uint16Array, index: number, array: Uint16Array[]) => U, thisArg: Z): [U, U, U]; <U>(this: [Uint16Array, Uint16Array], callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => U): [U, U]; <U>(this: [Uint16Array, Uint16Array], callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [Uint16Array, Uint16Array], callbackfn: (this: Z, value: Uint16Array, index: number, array: Uint16Array[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => U): U[]; <U>(callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: Uint16Array, index: number, array: Uint16Array[]) => U, thisArg: Z): U[]; }
+>function (val, index) {            if (val === this.options[index])                return this.options[index];        } : (this: { options: Uint16Array[]; }, val: Uint16Array, index: number) => Uint16Array
+>val : Uint16Array
+>index : number
+
+            if (val === this.options[index])
+>val === this.options[index] : boolean
+>val : Uint16Array
+>this.options[index] : Uint16Array
+>this.options : Uint16Array[]
+>this : { options: Uint16Array[]; }
+>options : Uint16Array[]
+>index : number
+
+                return this.options[index];
+>this.options[index] : Uint16Array
+>this.options : Uint16Array[]
+>this : { options: Uint16Array[]; }
+>options : Uint16Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint16Array[]; }
+
+        options.some(function (val, index) {
+>options.some(function (val, index) {            return val === this.options[index];        }, thisObject) : boolean
+>options.some : { (callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Uint16Array, index: number, array: Uint16Array[]) => boolean, thisArg: Z): boolean; }
+>options : Uint16Array[]
+>some : { (callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Uint16Array, index: number, array: Uint16Array[]) => boolean, thisArg: Z): boolean; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Uint16Array[]; }, val: Uint16Array, index: number) => boolean
+>val : Uint16Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Uint16Array
+>this.options[index] : Uint16Array
+>this.options : Uint16Array[]
+>this : { options: Uint16Array[]; }
+>options : Uint16Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint16Array[]; }
+
+        options.filter(function (val, index) {
+>options.filter(function (val, index) {            return val === this.options[index];        }, thisObject) : Uint16Array[]
+>options.filter : { (callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => any): Uint16Array[]; (callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => any, thisArg: undefined): Uint16Array[]; <Z>(callbackfn: (this: Z, value: Uint16Array, index: number, array: Uint16Array[]) => any, thisArg: Z): Uint16Array[]; }
+>options : Uint16Array[]
+>filter : { (callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => any): Uint16Array[]; (callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => any, thisArg: undefined): Uint16Array[]; <Z>(callbackfn: (this: Z, value: Uint16Array, index: number, array: Uint16Array[]) => any, thisArg: Z): Uint16Array[]; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Uint16Array[]; }, val: Uint16Array, index: number) => boolean
+>val : Uint16Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Uint16Array
+>this.options[index] : Uint16Array
+>this.options : Uint16Array[]
+>this : { options: Uint16Array[]; }
+>options : Uint16Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint16Array[]; }
+
+        options.every(function (val, index) {
+>options.every(function (val, index) {            return val === this.options[index];        }, thisObject) : boolean
+>options.every : { (callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Uint16Array, index: number, array: Uint16Array[]) => boolean, thisArg: Z): boolean; }
+>options : Uint16Array[]
+>every : { (callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Uint16Array, index: number, array: Uint16Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Uint16Array, index: number, array: Uint16Array[]) => boolean, thisArg: Z): boolean; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Uint16Array[]; }, val: Uint16Array, index: number) => boolean
+>val : Uint16Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Uint16Array
+>this.options[index] : Uint16Array
+>this.options : Uint16Array[]
+>this : { options: Uint16Array[]; }
+>options : Uint16Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint16Array[]; }
+    }
+
+    test8(options: Uint32Array[]) {
+>test8 : (options: Uint32Array[]) => void
+>options : Uint32Array[]
+>Uint32Array : Uint32Array
+
+        const thisObject = {
+>thisObject : { options: Uint32Array[]; }
+>{            options: [] as Uint32Array[]        } : { options: Uint32Array[]; }
+
+            options: [] as Uint32Array[]
+>options : Uint32Array[]
+>[] as Uint32Array[] : Uint32Array[]
+>[] : undefined[]
+>Uint32Array : Uint32Array
+
+        };
+
+        options.find(function (val, index) {
+>options.find(function (val, index) {            return val === this.options[index];        }, thisObject) : Uint32Array
+>options.find : { (predicate: (this: undefined, value: Uint32Array, index: number, obj: Uint32Array[]) => boolean): Uint32Array; (predicate: (this: undefined, value: Uint32Array, index: number, obj: Uint32Array[]) => boolean, thisArg: undefined): Uint32Array; <Z>(predicate: (this: Z, value: Uint32Array, index: number, obj: Uint32Array[]) => boolean, thisArg: Z): Uint32Array; }
+>options : Uint32Array[]
+>find : { (predicate: (this: undefined, value: Uint32Array, index: number, obj: Uint32Array[]) => boolean): Uint32Array; (predicate: (this: undefined, value: Uint32Array, index: number, obj: Uint32Array[]) => boolean, thisArg: undefined): Uint32Array; <Z>(predicate: (this: Z, value: Uint32Array, index: number, obj: Uint32Array[]) => boolean, thisArg: Z): Uint32Array; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Uint32Array[]; }, val: Uint32Array, index: number) => boolean
+>val : Uint32Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Uint32Array
+>this.options[index] : Uint32Array
+>this.options : Uint32Array[]
+>this : { options: Uint32Array[]; }
+>options : Uint32Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint32Array[]; }
+
+        options.findIndex(function (val, index) {
+>options.findIndex(function (val, index) {            return val === this.options[index];        }, thisObject) : number
+>options.findIndex : { (predicate: (this: undefined, value: Uint32Array, index: number, obj: Uint32Array[]) => boolean): number; (predicate: (this: undefined, value: Uint32Array, index: number, obj: Uint32Array[]) => boolean, thisArg: undefined): number; <Z>(predicate: (this: Z, value: Uint32Array, index: number, obj: Uint32Array[]) => boolean, thisArg: Z): number; }
+>options : Uint32Array[]
+>findIndex : { (predicate: (this: undefined, value: Uint32Array, index: number, obj: Uint32Array[]) => boolean): number; (predicate: (this: undefined, value: Uint32Array, index: number, obj: Uint32Array[]) => boolean, thisArg: undefined): number; <Z>(predicate: (this: Z, value: Uint32Array, index: number, obj: Uint32Array[]) => boolean, thisArg: Z): number; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Uint32Array[]; }, val: Uint32Array, index: number) => boolean
+>val : Uint32Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Uint32Array
+>this.options[index] : Uint32Array
+>this.options : Uint32Array[]
+>this : { options: Uint32Array[]; }
+>options : Uint32Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint32Array[]; }
+
+        options.forEach(function (val, index) {
+>options.forEach(function (val, index) {            return val === this.options[index];        }, thisObject) : void
+>options.forEach : { (callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => void): void; (callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: Uint32Array, index: number, array: Uint32Array[]) => void, thisArg: Z): void; }
+>options : Uint32Array[]
+>forEach : { (callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => void): void; (callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: Uint32Array, index: number, array: Uint32Array[]) => void, thisArg: Z): void; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Uint32Array[]; }, val: Uint32Array, index: number) => boolean
+>val : Uint32Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Uint32Array
+>this.options[index] : Uint32Array
+>this.options : Uint32Array[]
+>this : { options: Uint32Array[]; }
+>options : Uint32Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint32Array[]; }
+
+        options.map(function (val, index) {
+>options.map(function (val, index) {            if (val === this.options[index])                return this.options[index];        }, thisObject) : Uint32Array[]
+>options.map : { <U>(this: [Uint32Array, Uint32Array, Uint32Array, Uint32Array, Uint32Array], callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => U): [U, U, U, U, U]; <U>(this: [Uint32Array, Uint32Array, Uint32Array, Uint32Array, Uint32Array], callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [Uint32Array, Uint32Array, Uint32Array, Uint32Array, Uint32Array], callbackfn: (this: Z, value: Uint32Array, index: number, array: Uint32Array[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [Uint32Array, Uint32Array, Uint32Array, Uint32Array], callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => U): [U, U, U, U]; <U>(this: [Uint32Array, Uint32Array, Uint32Array, Uint32Array], callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [Uint32Array, Uint32Array, Uint32Array, Uint32Array], callbackfn: (this: Z, value: Uint32Array, index: number, array: Uint32Array[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [Uint32Array, Uint32Array, Uint32Array], callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => U): [U, U, U]; <U>(this: [Uint32Array, Uint32Array, Uint32Array], callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [Uint32Array, Uint32Array, Uint32Array], callbackfn: (this: Z, value: Uint32Array, index: number, array: Uint32Array[]) => U, thisArg: Z): [U, U, U]; <U>(this: [Uint32Array, Uint32Array], callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => U): [U, U]; <U>(this: [Uint32Array, Uint32Array], callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [Uint32Array, Uint32Array], callbackfn: (this: Z, value: Uint32Array, index: number, array: Uint32Array[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => U): U[]; <U>(callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: Uint32Array, index: number, array: Uint32Array[]) => U, thisArg: Z): U[]; }
+>options : Uint32Array[]
+>map : { <U>(this: [Uint32Array, Uint32Array, Uint32Array, Uint32Array, Uint32Array], callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => U): [U, U, U, U, U]; <U>(this: [Uint32Array, Uint32Array, Uint32Array, Uint32Array, Uint32Array], callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [Uint32Array, Uint32Array, Uint32Array, Uint32Array, Uint32Array], callbackfn: (this: Z, value: Uint32Array, index: number, array: Uint32Array[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [Uint32Array, Uint32Array, Uint32Array, Uint32Array], callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => U): [U, U, U, U]; <U>(this: [Uint32Array, Uint32Array, Uint32Array, Uint32Array], callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [Uint32Array, Uint32Array, Uint32Array, Uint32Array], callbackfn: (this: Z, value: Uint32Array, index: number, array: Uint32Array[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [Uint32Array, Uint32Array, Uint32Array], callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => U): [U, U, U]; <U>(this: [Uint32Array, Uint32Array, Uint32Array], callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [Uint32Array, Uint32Array, Uint32Array], callbackfn: (this: Z, value: Uint32Array, index: number, array: Uint32Array[]) => U, thisArg: Z): [U, U, U]; <U>(this: [Uint32Array, Uint32Array], callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => U): [U, U]; <U>(this: [Uint32Array, Uint32Array], callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [Uint32Array, Uint32Array], callbackfn: (this: Z, value: Uint32Array, index: number, array: Uint32Array[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => U): U[]; <U>(callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: Uint32Array, index: number, array: Uint32Array[]) => U, thisArg: Z): U[]; }
+>function (val, index) {            if (val === this.options[index])                return this.options[index];        } : (this: { options: Uint32Array[]; }, val: Uint32Array, index: number) => Uint32Array
+>val : Uint32Array
+>index : number
+
+            if (val === this.options[index])
+>val === this.options[index] : boolean
+>val : Uint32Array
+>this.options[index] : Uint32Array
+>this.options : Uint32Array[]
+>this : { options: Uint32Array[]; }
+>options : Uint32Array[]
+>index : number
+
+                return this.options[index];
+>this.options[index] : Uint32Array
+>this.options : Uint32Array[]
+>this : { options: Uint32Array[]; }
+>options : Uint32Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint32Array[]; }
+
+        options.some(function (val, index) {
+>options.some(function (val, index) {            return val === this.options[index];        }, thisObject) : boolean
+>options.some : { (callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Uint32Array, index: number, array: Uint32Array[]) => boolean, thisArg: Z): boolean; }
+>options : Uint32Array[]
+>some : { (callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Uint32Array, index: number, array: Uint32Array[]) => boolean, thisArg: Z): boolean; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Uint32Array[]; }, val: Uint32Array, index: number) => boolean
+>val : Uint32Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Uint32Array
+>this.options[index] : Uint32Array
+>this.options : Uint32Array[]
+>this : { options: Uint32Array[]; }
+>options : Uint32Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint32Array[]; }
+
+        options.filter(function (val, index) {
+>options.filter(function (val, index) {            return val === this.options[index];        }, thisObject) : Uint32Array[]
+>options.filter : { (callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => any): Uint32Array[]; (callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => any, thisArg: undefined): Uint32Array[]; <Z>(callbackfn: (this: Z, value: Uint32Array, index: number, array: Uint32Array[]) => any, thisArg: Z): Uint32Array[]; }
+>options : Uint32Array[]
+>filter : { (callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => any): Uint32Array[]; (callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => any, thisArg: undefined): Uint32Array[]; <Z>(callbackfn: (this: Z, value: Uint32Array, index: number, array: Uint32Array[]) => any, thisArg: Z): Uint32Array[]; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Uint32Array[]; }, val: Uint32Array, index: number) => boolean
+>val : Uint32Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Uint32Array
+>this.options[index] : Uint32Array
+>this.options : Uint32Array[]
+>this : { options: Uint32Array[]; }
+>options : Uint32Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint32Array[]; }
+
+        options.every(function (val, index) {
+>options.every(function (val, index) {            return val === this.options[index];        }, thisObject) : boolean
+>options.every : { (callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Uint32Array, index: number, array: Uint32Array[]) => boolean, thisArg: Z): boolean; }
+>options : Uint32Array[]
+>every : { (callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Uint32Array, index: number, array: Uint32Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Uint32Array, index: number, array: Uint32Array[]) => boolean, thisArg: Z): boolean; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Uint32Array[]; }, val: Uint32Array, index: number) => boolean
+>val : Uint32Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Uint32Array
+>this.options[index] : Uint32Array
+>this.options : Uint32Array[]
+>this : { options: Uint32Array[]; }
+>options : Uint32Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Uint32Array[]; }
+    }
+
+    test9(options: Float64Array[]) {
+>test9 : (options: Float64Array[]) => void
+>options : Float64Array[]
+>Float64Array : Float64Array
+
+        const thisObject = {
+>thisObject : { options: Float64Array[]; }
+>{            options: [] as Float64Array[]        } : { options: Float64Array[]; }
+
+            options: [] as Float64Array[]
+>options : Float64Array[]
+>[] as Float64Array[] : Float64Array[]
+>[] : undefined[]
+>Float64Array : Float64Array
+
+        };
+
+        options.find(function (val, index) {
+>options.find(function (val, index) {            return val === this.options[index];        }, thisObject) : Float64Array
+>options.find : { (predicate: (this: undefined, value: Float64Array, index: number, obj: Float64Array[]) => boolean): Float64Array; (predicate: (this: undefined, value: Float64Array, index: number, obj: Float64Array[]) => boolean, thisArg: undefined): Float64Array; <Z>(predicate: (this: Z, value: Float64Array, index: number, obj: Float64Array[]) => boolean, thisArg: Z): Float64Array; }
+>options : Float64Array[]
+>find : { (predicate: (this: undefined, value: Float64Array, index: number, obj: Float64Array[]) => boolean): Float64Array; (predicate: (this: undefined, value: Float64Array, index: number, obj: Float64Array[]) => boolean, thisArg: undefined): Float64Array; <Z>(predicate: (this: Z, value: Float64Array, index: number, obj: Float64Array[]) => boolean, thisArg: Z): Float64Array; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Float64Array[]; }, val: Float64Array, index: number) => boolean
+>val : Float64Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Float64Array
+>this.options[index] : Float64Array
+>this.options : Float64Array[]
+>this : { options: Float64Array[]; }
+>options : Float64Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Float64Array[]; }
+
+        options.findIndex(function (val, index) {
+>options.findIndex(function (val, index) {            return val === this.options[index];        }, thisObject) : number
+>options.findIndex : { (predicate: (this: undefined, value: Float64Array, index: number, obj: Float64Array[]) => boolean): number; (predicate: (this: undefined, value: Float64Array, index: number, obj: Float64Array[]) => boolean, thisArg: undefined): number; <Z>(predicate: (this: Z, value: Float64Array, index: number, obj: Float64Array[]) => boolean, thisArg: Z): number; }
+>options : Float64Array[]
+>findIndex : { (predicate: (this: undefined, value: Float64Array, index: number, obj: Float64Array[]) => boolean): number; (predicate: (this: undefined, value: Float64Array, index: number, obj: Float64Array[]) => boolean, thisArg: undefined): number; <Z>(predicate: (this: Z, value: Float64Array, index: number, obj: Float64Array[]) => boolean, thisArg: Z): number; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Float64Array[]; }, val: Float64Array, index: number) => boolean
+>val : Float64Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Float64Array
+>this.options[index] : Float64Array
+>this.options : Float64Array[]
+>this : { options: Float64Array[]; }
+>options : Float64Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Float64Array[]; }
+
+        options.forEach(function (val, index) {
+>options.forEach(function (val, index) {            return val === this.options[index];        }, thisObject) : void
+>options.forEach : { (callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => void): void; (callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: Float64Array, index: number, array: Float64Array[]) => void, thisArg: Z): void; }
+>options : Float64Array[]
+>forEach : { (callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => void): void; (callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => void, thisArg: undefined): void; <Z>(callbackfn: (this: Z, value: Float64Array, index: number, array: Float64Array[]) => void, thisArg: Z): void; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Float64Array[]; }, val: Float64Array, index: number) => boolean
+>val : Float64Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Float64Array
+>this.options[index] : Float64Array
+>this.options : Float64Array[]
+>this : { options: Float64Array[]; }
+>options : Float64Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Float64Array[]; }
+
+        options.map(function (val, index) {
+>options.map(function (val, index) {            if (val === this.options[index])                return this.options[index];        }, thisObject) : Float64Array[]
+>options.map : { <U>(this: [Float64Array, Float64Array, Float64Array, Float64Array, Float64Array], callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => U): [U, U, U, U, U]; <U>(this: [Float64Array, Float64Array, Float64Array, Float64Array, Float64Array], callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [Float64Array, Float64Array, Float64Array, Float64Array, Float64Array], callbackfn: (this: Z, value: Float64Array, index: number, array: Float64Array[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [Float64Array, Float64Array, Float64Array, Float64Array], callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => U): [U, U, U, U]; <U>(this: [Float64Array, Float64Array, Float64Array, Float64Array], callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [Float64Array, Float64Array, Float64Array, Float64Array], callbackfn: (this: Z, value: Float64Array, index: number, array: Float64Array[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [Float64Array, Float64Array, Float64Array], callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => U): [U, U, U]; <U>(this: [Float64Array, Float64Array, Float64Array], callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [Float64Array, Float64Array, Float64Array], callbackfn: (this: Z, value: Float64Array, index: number, array: Float64Array[]) => U, thisArg: Z): [U, U, U]; <U>(this: [Float64Array, Float64Array], callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => U): [U, U]; <U>(this: [Float64Array, Float64Array], callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [Float64Array, Float64Array], callbackfn: (this: Z, value: Float64Array, index: number, array: Float64Array[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => U): U[]; <U>(callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: Float64Array, index: number, array: Float64Array[]) => U, thisArg: Z): U[]; }
+>options : Float64Array[]
+>map : { <U>(this: [Float64Array, Float64Array, Float64Array, Float64Array, Float64Array], callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => U): [U, U, U, U, U]; <U>(this: [Float64Array, Float64Array, Float64Array, Float64Array, Float64Array], callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [Float64Array, Float64Array, Float64Array, Float64Array, Float64Array], callbackfn: (this: Z, value: Float64Array, index: number, array: Float64Array[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [Float64Array, Float64Array, Float64Array, Float64Array], callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => U): [U, U, U, U]; <U>(this: [Float64Array, Float64Array, Float64Array, Float64Array], callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [Float64Array, Float64Array, Float64Array, Float64Array], callbackfn: (this: Z, value: Float64Array, index: number, array: Float64Array[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [Float64Array, Float64Array, Float64Array], callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => U): [U, U, U]; <U>(this: [Float64Array, Float64Array, Float64Array], callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [Float64Array, Float64Array, Float64Array], callbackfn: (this: Z, value: Float64Array, index: number, array: Float64Array[]) => U, thisArg: Z): [U, U, U]; <U>(this: [Float64Array, Float64Array], callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => U): [U, U]; <U>(this: [Float64Array, Float64Array], callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [Float64Array, Float64Array], callbackfn: (this: Z, value: Float64Array, index: number, array: Float64Array[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => U): U[]; <U>(callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: Float64Array, index: number, array: Float64Array[]) => U, thisArg: Z): U[]; }
+>function (val, index) {            if (val === this.options[index])                return this.options[index];        } : (this: { options: Float64Array[]; }, val: Float64Array, index: number) => Float64Array
+>val : Float64Array
+>index : number
+
+            if (val === this.options[index])
+>val === this.options[index] : boolean
+>val : Float64Array
+>this.options[index] : Float64Array
+>this.options : Float64Array[]
+>this : { options: Float64Array[]; }
+>options : Float64Array[]
+>index : number
+
+                return this.options[index];
+>this.options[index] : Float64Array
+>this.options : Float64Array[]
+>this : { options: Float64Array[]; }
+>options : Float64Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Float64Array[]; }
+
+        options.some(function (val, index) {
+>options.some(function (val, index) {            return val === this.options[index];        }, thisObject) : boolean
+>options.some : { (callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Float64Array, index: number, array: Float64Array[]) => boolean, thisArg: Z): boolean; }
+>options : Float64Array[]
+>some : { (callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Float64Array, index: number, array: Float64Array[]) => boolean, thisArg: Z): boolean; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Float64Array[]; }, val: Float64Array, index: number) => boolean
+>val : Float64Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Float64Array
+>this.options[index] : Float64Array
+>this.options : Float64Array[]
+>this : { options: Float64Array[]; }
+>options : Float64Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Float64Array[]; }
+
+        options.filter(function (val, index) {
+>options.filter(function (val, index) {            return val === this.options[index];        }, thisObject) : Float64Array[]
+>options.filter : { (callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => any): Float64Array[]; (callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => any, thisArg: undefined): Float64Array[]; <Z>(callbackfn: (this: Z, value: Float64Array, index: number, array: Float64Array[]) => any, thisArg: Z): Float64Array[]; }
+>options : Float64Array[]
+>filter : { (callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => any): Float64Array[]; (callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => any, thisArg: undefined): Float64Array[]; <Z>(callbackfn: (this: Z, value: Float64Array, index: number, array: Float64Array[]) => any, thisArg: Z): Float64Array[]; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Float64Array[]; }, val: Float64Array, index: number) => boolean
+>val : Float64Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Float64Array
+>this.options[index] : Float64Array
+>this.options : Float64Array[]
+>this : { options: Float64Array[]; }
+>options : Float64Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Float64Array[]; }
+
+        options.every(function (val, index) {
+>options.every(function (val, index) {            return val === this.options[index];        }, thisObject) : boolean
+>options.every : { (callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Float64Array, index: number, array: Float64Array[]) => boolean, thisArg: Z): boolean; }
+>options : Float64Array[]
+>every : { (callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => boolean): boolean; (callbackfn: (this: undefined, value: Float64Array, index: number, array: Float64Array[]) => boolean, thisArg: undefined): boolean; <Z>(callbackfn: (this: Z, value: Float64Array, index: number, array: Float64Array[]) => boolean, thisArg: Z): boolean; }
+>function (val, index) {            return val === this.options[index];        } : (this: { options: Float64Array[]; }, val: Float64Array, index: number) => boolean
+>val : Float64Array
+>index : number
+
+            return val === this.options[index];
+>val === this.options[index] : boolean
+>val : Float64Array
+>this.options[index] : Float64Array
+>this.options : Float64Array[]
+>this : { options: Float64Array[]; }
+>options : Float64Array[]
+>index : number
+
+        }, thisObject);
+>thisObject : { options: Float64Array[]; }
+    }
+}
+
diff --git a/tests/baselines/reference/tsxSpreadChildren.symbols b/tests/baselines/reference/tsxSpreadChildren.symbols
index b2631c70fd9..2556b7c61b6 100644
--- a/tests/baselines/reference/tsxSpreadChildren.symbols
+++ b/tests/baselines/reference/tsxSpreadChildren.symbols
@@ -59,9 +59,9 @@ function TodoList({ todos }: TodoListProps) {
 >div : Symbol(JSX.IntrinsicElements, Decl(tsxSpreadChildren.tsx, 2, 22))
 
         {...todos.map(todo => <Todo key={todo.id} todo={todo.todo}/>)}
->todos.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>todos.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >todos : Symbol(todos, Decl(tsxSpreadChildren.tsx, 19, 19))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >todo : Symbol(todo, Decl(tsxSpreadChildren.tsx, 21, 22))
 >Todo : Symbol(Todo, Decl(tsxSpreadChildren.tsx, 15, 1))
 >key : Symbol(key, Decl(tsxSpreadChildren.tsx, 21, 35))
diff --git a/tests/baselines/reference/tsxSpreadChildren.types b/tests/baselines/reference/tsxSpreadChildren.types
index 1317499ff45..9ab9d7093d4 100644
--- a/tests/baselines/reference/tsxSpreadChildren.types
+++ b/tests/baselines/reference/tsxSpreadChildren.types
@@ -64,10 +64,10 @@ function TodoList({ todos }: TodoListProps) {
 
         {...todos.map(todo => <Todo key={todo.id} todo={todo.todo}/>)}
 >todos.map(todo => <Todo key={todo.id} todo={todo.todo}/>) : JSX.Element[]
->todos.map : { <U>(this: [TodoProp, TodoProp, TodoProp, TodoProp, TodoProp], callbackfn: (value: TodoProp, index: number, array: TodoProp[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [TodoProp, TodoProp, TodoProp, TodoProp], callbackfn: (value: TodoProp, index: number, array: TodoProp[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [TodoProp, TodoProp, TodoProp], callbackfn: (value: TodoProp, index: number, array: TodoProp[]) => U, thisArg?: any): [U, U, U]; <U>(this: [TodoProp, TodoProp], callbackfn: (value: TodoProp, index: number, array: TodoProp[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: TodoProp, index: number, array: TodoProp[]) => U, thisArg?: any): U[]; }
+>todos.map : { <U>(this: [TodoProp, TodoProp, TodoProp, TodoProp, TodoProp], callbackfn: (this: undefined, value: TodoProp, index: number, array: TodoProp[]) => U): [U, U, U, U, U]; <U>(this: [TodoProp, TodoProp, TodoProp, TodoProp, TodoProp], callbackfn: (this: undefined, value: TodoProp, index: number, array: TodoProp[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [TodoProp, TodoProp, TodoProp, TodoProp, TodoProp], callbackfn: (this: Z, value: TodoProp, index: number, array: TodoProp[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [TodoProp, TodoProp, TodoProp, TodoProp], callbackfn: (this: undefined, value: TodoProp, index: number, array: TodoProp[]) => U): [U, U, U, U]; <U>(this: [TodoProp, TodoProp, TodoProp, TodoProp], callbackfn: (this: undefined, value: TodoProp, index: number, array: TodoProp[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [TodoProp, TodoProp, TodoProp, TodoProp], callbackfn: (this: Z, value: TodoProp, index: number, array: TodoProp[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [TodoProp, TodoProp, TodoProp], callbackfn: (this: undefined, value: TodoProp, index: number, array: TodoProp[]) => U): [U, U, U]; <U>(this: [TodoProp, TodoProp, TodoProp], callbackfn: (this: undefined, value: TodoProp, index: number, array: TodoProp[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [TodoProp, TodoProp, TodoProp], callbackfn: (this: Z, value: TodoProp, index: number, array: TodoProp[]) => U, thisArg: Z): [U, U, U]; <U>(this: [TodoProp, TodoProp], callbackfn: (this: undefined, value: TodoProp, index: number, array: TodoProp[]) => U): [U, U]; <U>(this: [TodoProp, TodoProp], callbackfn: (this: undefined, value: TodoProp, index: number, array: TodoProp[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [TodoProp, TodoProp], callbackfn: (this: Z, value: TodoProp, index: number, array: TodoProp[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: TodoProp, index: number, array: TodoProp[]) => U): U[]; <U>(callbackfn: (this: undefined, value: TodoProp, index: number, array: TodoProp[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: TodoProp, index: number, array: TodoProp[]) => U, thisArg: Z): U[]; }
 >todos : TodoProp[]
->map : { <U>(this: [TodoProp, TodoProp, TodoProp, TodoProp, TodoProp], callbackfn: (value: TodoProp, index: number, array: TodoProp[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [TodoProp, TodoProp, TodoProp, TodoProp], callbackfn: (value: TodoProp, index: number, array: TodoProp[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [TodoProp, TodoProp, TodoProp], callbackfn: (value: TodoProp, index: number, array: TodoProp[]) => U, thisArg?: any): [U, U, U]; <U>(this: [TodoProp, TodoProp], callbackfn: (value: TodoProp, index: number, array: TodoProp[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: TodoProp, index: number, array: TodoProp[]) => U, thisArg?: any): U[]; }
->todo => <Todo key={todo.id} todo={todo.todo}/> : (todo: TodoProp) => JSX.Element
+>map : { <U>(this: [TodoProp, TodoProp, TodoProp, TodoProp, TodoProp], callbackfn: (this: undefined, value: TodoProp, index: number, array: TodoProp[]) => U): [U, U, U, U, U]; <U>(this: [TodoProp, TodoProp, TodoProp, TodoProp, TodoProp], callbackfn: (this: undefined, value: TodoProp, index: number, array: TodoProp[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [TodoProp, TodoProp, TodoProp, TodoProp, TodoProp], callbackfn: (this: Z, value: TodoProp, index: number, array: TodoProp[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [TodoProp, TodoProp, TodoProp, TodoProp], callbackfn: (this: undefined, value: TodoProp, index: number, array: TodoProp[]) => U): [U, U, U, U]; <U>(this: [TodoProp, TodoProp, TodoProp, TodoProp], callbackfn: (this: undefined, value: TodoProp, index: number, array: TodoProp[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [TodoProp, TodoProp, TodoProp, TodoProp], callbackfn: (this: Z, value: TodoProp, index: number, array: TodoProp[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [TodoProp, TodoProp, TodoProp], callbackfn: (this: undefined, value: TodoProp, index: number, array: TodoProp[]) => U): [U, U, U]; <U>(this: [TodoProp, TodoProp, TodoProp], callbackfn: (this: undefined, value: TodoProp, index: number, array: TodoProp[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [TodoProp, TodoProp, TodoProp], callbackfn: (this: Z, value: TodoProp, index: number, array: TodoProp[]) => U, thisArg: Z): [U, U, U]; <U>(this: [TodoProp, TodoProp], callbackfn: (this: undefined, value: TodoProp, index: number, array: TodoProp[]) => U): [U, U]; <U>(this: [TodoProp, TodoProp], callbackfn: (this: undefined, value: TodoProp, index: number, array: TodoProp[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [TodoProp, TodoProp], callbackfn: (this: Z, value: TodoProp, index: number, array: TodoProp[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: TodoProp, index: number, array: TodoProp[]) => U): U[]; <U>(callbackfn: (this: undefined, value: TodoProp, index: number, array: TodoProp[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: TodoProp, index: number, array: TodoProp[]) => U, thisArg: Z): U[]; }
+>todo => <Todo key={todo.id} todo={todo.todo}/> : (this: undefined, todo: TodoProp) => JSX.Element
 >todo : TodoProp
 ><Todo key={todo.id} todo={todo.todo}/> : JSX.Element
 >Todo : (prop: { key: number; todo: string; }) => JSX.Element
diff --git a/tests/baselines/reference/typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral01.symbols b/tests/baselines/reference/typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral01.symbols
index 766c75e2c13..d294a9c28cf 100644
--- a/tests/baselines/reference/typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral01.symbols
+++ b/tests/baselines/reference/typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral01.symbols
@@ -15,9 +15,9 @@ var nodes: TreeNode[];
 >TreeNode : Symbol(TreeNode, Decl(typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral01.ts, 0, 0))
 
 nodes.map(n => n.name);
->nodes.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>nodes.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >nodes : Symbol(nodes, Decl(typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral01.ts, 5, 3))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >n : Symbol(n, Decl(typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral01.ts, 6, 10))
 >n.name : Symbol(name, Decl(typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral01.ts, 0, 17))
 >n : Symbol(n, Decl(typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral01.ts, 6, 10))
diff --git a/tests/baselines/reference/typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral01.types b/tests/baselines/reference/typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral01.types
index 045b5e65da3..21332704326 100644
--- a/tests/baselines/reference/typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral01.types
+++ b/tests/baselines/reference/typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral01.types
@@ -16,10 +16,10 @@ var nodes: TreeNode[];
 
 nodes.map(n => n.name);
 >nodes.map(n => n.name) : string[]
->nodes.map : { <U>(this: [TreeNode, TreeNode, TreeNode, TreeNode, TreeNode], callbackfn: (value: TreeNode, index: number, array: TreeNode[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [TreeNode, TreeNode, TreeNode, TreeNode], callbackfn: (value: TreeNode, index: number, array: TreeNode[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [TreeNode, TreeNode, TreeNode], callbackfn: (value: TreeNode, index: number, array: TreeNode[]) => U, thisArg?: any): [U, U, U]; <U>(this: [TreeNode, TreeNode], callbackfn: (value: TreeNode, index: number, array: TreeNode[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: TreeNode, index: number, array: TreeNode[]) => U, thisArg?: any): U[]; }
+>nodes.map : { <U>(this: [TreeNode, TreeNode, TreeNode, TreeNode, TreeNode], callbackfn: (this: undefined, value: TreeNode, index: number, array: TreeNode[]) => U): [U, U, U, U, U]; <U>(this: [TreeNode, TreeNode, TreeNode, TreeNode, TreeNode], callbackfn: (this: undefined, value: TreeNode, index: number, array: TreeNode[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [TreeNode, TreeNode, TreeNode, TreeNode, TreeNode], callbackfn: (this: Z, value: TreeNode, index: number, array: TreeNode[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [TreeNode, TreeNode, TreeNode, TreeNode], callbackfn: (this: undefined, value: TreeNode, index: number, array: TreeNode[]) => U): [U, U, U, U]; <U>(this: [TreeNode, TreeNode, TreeNode, TreeNode], callbackfn: (this: undefined, value: TreeNode, index: number, array: TreeNode[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [TreeNode, TreeNode, TreeNode, TreeNode], callbackfn: (this: Z, value: TreeNode, index: number, array: TreeNode[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [TreeNode, TreeNode, TreeNode], callbackfn: (this: undefined, value: TreeNode, index: number, array: TreeNode[]) => U): [U, U, U]; <U>(this: [TreeNode, TreeNode, TreeNode], callbackfn: (this: undefined, value: TreeNode, index: number, array: TreeNode[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [TreeNode, TreeNode, TreeNode], callbackfn: (this: Z, value: TreeNode, index: number, array: TreeNode[]) => U, thisArg: Z): [U, U, U]; <U>(this: [TreeNode, TreeNode], callbackfn: (this: undefined, value: TreeNode, index: number, array: TreeNode[]) => U): [U, U]; <U>(this: [TreeNode, TreeNode], callbackfn: (this: undefined, value: TreeNode, index: number, array: TreeNode[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [TreeNode, TreeNode], callbackfn: (this: Z, value: TreeNode, index: number, array: TreeNode[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: TreeNode, index: number, array: TreeNode[]) => U): U[]; <U>(callbackfn: (this: undefined, value: TreeNode, index: number, array: TreeNode[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: TreeNode, index: number, array: TreeNode[]) => U, thisArg: Z): U[]; }
 >nodes : TreeNode[]
->map : { <U>(this: [TreeNode, TreeNode, TreeNode, TreeNode, TreeNode], callbackfn: (value: TreeNode, index: number, array: TreeNode[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [TreeNode, TreeNode, TreeNode, TreeNode], callbackfn: (value: TreeNode, index: number, array: TreeNode[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [TreeNode, TreeNode, TreeNode], callbackfn: (value: TreeNode, index: number, array: TreeNode[]) => U, thisArg?: any): [U, U, U]; <U>(this: [TreeNode, TreeNode], callbackfn: (value: TreeNode, index: number, array: TreeNode[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: TreeNode, index: number, array: TreeNode[]) => U, thisArg?: any): U[]; }
->n => n.name : (n: TreeNode) => string
+>map : { <U>(this: [TreeNode, TreeNode, TreeNode, TreeNode, TreeNode], callbackfn: (this: undefined, value: TreeNode, index: number, array: TreeNode[]) => U): [U, U, U, U, U]; <U>(this: [TreeNode, TreeNode, TreeNode, TreeNode, TreeNode], callbackfn: (this: undefined, value: TreeNode, index: number, array: TreeNode[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [TreeNode, TreeNode, TreeNode, TreeNode, TreeNode], callbackfn: (this: Z, value: TreeNode, index: number, array: TreeNode[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [TreeNode, TreeNode, TreeNode, TreeNode], callbackfn: (this: undefined, value: TreeNode, index: number, array: TreeNode[]) => U): [U, U, U, U]; <U>(this: [TreeNode, TreeNode, TreeNode, TreeNode], callbackfn: (this: undefined, value: TreeNode, index: number, array: TreeNode[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [TreeNode, TreeNode, TreeNode, TreeNode], callbackfn: (this: Z, value: TreeNode, index: number, array: TreeNode[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [TreeNode, TreeNode, TreeNode], callbackfn: (this: undefined, value: TreeNode, index: number, array: TreeNode[]) => U): [U, U, U]; <U>(this: [TreeNode, TreeNode, TreeNode], callbackfn: (this: undefined, value: TreeNode, index: number, array: TreeNode[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [TreeNode, TreeNode, TreeNode], callbackfn: (this: Z, value: TreeNode, index: number, array: TreeNode[]) => U, thisArg: Z): [U, U, U]; <U>(this: [TreeNode, TreeNode], callbackfn: (this: undefined, value: TreeNode, index: number, array: TreeNode[]) => U): [U, U]; <U>(this: [TreeNode, TreeNode], callbackfn: (this: undefined, value: TreeNode, index: number, array: TreeNode[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [TreeNode, TreeNode], callbackfn: (this: Z, value: TreeNode, index: number, array: TreeNode[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: TreeNode, index: number, array: TreeNode[]) => U): U[]; <U>(callbackfn: (this: undefined, value: TreeNode, index: number, array: TreeNode[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: TreeNode, index: number, array: TreeNode[]) => U, thisArg: Z): U[]; }
+>n => n.name : (this: undefined, n: TreeNode) => string
 >n : TreeNode
 >n.name : string
 >n : TreeNode
diff --git a/tests/baselines/reference/typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral02.symbols b/tests/baselines/reference/typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral02.symbols
index 62e2b398827..3761994619c 100644
--- a/tests/baselines/reference/typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral02.symbols
+++ b/tests/baselines/reference/typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral02.symbols
@@ -26,9 +26,9 @@ var nodes: TreeNodeMiddleman[];
 >TreeNodeMiddleman : Symbol(TreeNodeMiddleman, Decl(typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral02.ts, 3, 1))
 
 nodes.map(n => n.name);
->nodes.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>nodes.map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >nodes : Symbol(nodes, Decl(typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral02.ts, 10, 3))
->map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
+>map : Symbol(Array.map, Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --), Decl(lib.d.ts, --, --))
 >n : Symbol(n, Decl(typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral02.ts, 11, 10))
 >n.name : Symbol(name, Decl(typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral02.ts, 5, 26))
 >n : Symbol(n, Decl(typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral02.ts, 11, 10))
diff --git a/tests/baselines/reference/typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral02.types b/tests/baselines/reference/typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral02.types
index a75a997eb78..6cb4b81e0ce 100644
--- a/tests/baselines/reference/typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral02.types
+++ b/tests/baselines/reference/typeArgumentInferenceWithRecursivelyReferencedTypeAliasToTypeLiteral02.types
@@ -27,10 +27,10 @@ var nodes: TreeNodeMiddleman[];
 
 nodes.map(n => n.name);
 >nodes.map(n => n.name) : string[]
->nodes.map : { <U>(this: [TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg?: any): [U, U, U]; <U>(this: [TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg?: any): U[]; }
+>nodes.map : { <U>(this: [TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (this: undefined, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U): [U, U, U, U, U]; <U>(this: [TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (this: undefined, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (this: Z, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (this: undefined, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U): [U, U, U, U]; <U>(this: [TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (this: undefined, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (this: Z, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (this: undefined, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U): [U, U, U]; <U>(this: [TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (this: undefined, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (this: Z, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg: Z): [U, U, U]; <U>(this: [TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (this: undefined, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U): [U, U]; <U>(this: [TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (this: undefined, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (this: Z, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U): U[]; <U>(callbackfn: (this: undefined, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg: Z): U[]; }
 >nodes : TreeNodeMiddleman[]
->map : { <U>(this: [TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg?: any): [U, U, U, U, U]; <U>(this: [TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg?: any): [U, U, U, U]; <U>(this: [TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg?: any): [U, U, U]; <U>(this: [TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg?: any): [U, U]; <U>(callbackfn: (value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg?: any): U[]; }
->n => n.name : (n: TreeNodeMiddleman) => string
+>map : { <U>(this: [TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (this: undefined, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U): [U, U, U, U, U]; <U>(this: [TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (this: undefined, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg: undefined): [U, U, U, U, U]; <Z, U>(this: [TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (this: Z, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg: Z): [U, U, U, U, U]; <U>(this: [TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (this: undefined, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U): [U, U, U, U]; <U>(this: [TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (this: undefined, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg: undefined): [U, U, U, U]; <Z, U>(this: [TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (this: Z, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg: Z): [U, U, U, U]; <U>(this: [TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (this: undefined, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U): [U, U, U]; <U>(this: [TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (this: undefined, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg: undefined): [U, U, U]; <Z, U>(this: [TreeNodeMiddleman, TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (this: Z, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg: Z): [U, U, U]; <U>(this: [TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (this: undefined, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U): [U, U]; <U>(this: [TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (this: undefined, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg: undefined): [U, U]; <Z, U>(this: [TreeNodeMiddleman, TreeNodeMiddleman], callbackfn: (this: Z, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg: Z): [U, U]; <U>(callbackfn: (this: undefined, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U): U[]; <U>(callbackfn: (this: undefined, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg: undefined): U[]; <Z, U>(callbackfn: (this: Z, value: TreeNodeMiddleman, index: number, array: TreeNodeMiddleman[]) => U, thisArg: Z): U[]; }
+>n => n.name : (this: undefined, n: TreeNodeMiddleman) => string
 >n : TreeNodeMiddleman
 >n.name : string
 >n : TreeNodeMiddleman
diff --git a/tests/baselines/reference/typedArrays.symbols b/tests/baselines/reference/typedArrays.symbols
index 2d45fb7e5c1..ca7812bbcc8 100644
--- a/tests/baselines/reference/typedArrays.symbols
+++ b/tests/baselines/reference/typedArrays.symbols
@@ -167,65 +167,65 @@ function CreateIntegerTypedArraysFromArray2(obj:number[]) {
 
     typedArrays[0] = Int8Array.from(obj);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 47, 7))
->Int8Array.from : Symbol(Int8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Int8Array.from : Symbol(Int8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Int8Array : Symbol(Int8Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Int8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Int8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 46, 44))
 
     typedArrays[1] = Uint8Array.from(obj);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 47, 7))
->Uint8Array.from : Symbol(Uint8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Uint8Array.from : Symbol(Uint8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Uint8Array : Symbol(Uint8Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Uint8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Uint8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 46, 44))
 
     typedArrays[2] = Int16Array.from(obj);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 47, 7))
->Int16Array.from : Symbol(Int16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Int16Array.from : Symbol(Int16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Int16Array : Symbol(Int16Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Int16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Int16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 46, 44))
 
     typedArrays[3] = Uint16Array.from(obj);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 47, 7))
->Uint16Array.from : Symbol(Uint16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Uint16Array.from : Symbol(Uint16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Uint16Array : Symbol(Uint16Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Uint16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Uint16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 46, 44))
 
     typedArrays[4] = Int32Array.from(obj);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 47, 7))
->Int32Array.from : Symbol(Int32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Int32Array.from : Symbol(Int32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Int32Array : Symbol(Int32Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Int32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Int32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 46, 44))
 
     typedArrays[5] = Uint32Array.from(obj);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 47, 7))
->Uint32Array.from : Symbol(Uint32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Uint32Array.from : Symbol(Uint32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Uint32Array : Symbol(Uint32Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Uint32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Uint32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 46, 44))
 
     typedArrays[6] = Float32Array.from(obj);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 47, 7))
->Float32Array.from : Symbol(Float32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Float32Array.from : Symbol(Float32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Float32Array : Symbol(Float32Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Float32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Float32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 46, 44))
 
     typedArrays[7] = Float64Array.from(obj);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 47, 7))
->Float64Array.from : Symbol(Float64ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Float64Array.from : Symbol(Float64ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Float64Array : Symbol(Float64Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Float64ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Float64ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 46, 44))
 
     typedArrays[8] = Uint8ClampedArray.from(obj);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 47, 7))
->Uint8ClampedArray.from : Symbol(Uint8ClampedArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Uint8ClampedArray.from : Symbol(Uint8ClampedArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Uint8ClampedArray : Symbol(Uint8ClampedArray, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Uint8ClampedArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Uint8ClampedArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 46, 44))
 
     return typedArrays;
@@ -242,65 +242,65 @@ function CreateIntegerTypedArraysFromArrayLike(obj:ArrayLike<number>) {
 
     typedArrays[0] = Int8Array.from(obj);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 62, 7))
->Int8Array.from : Symbol(Int8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Int8Array.from : Symbol(Int8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Int8Array : Symbol(Int8Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Int8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Int8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 61, 47))
 
     typedArrays[1] = Uint8Array.from(obj);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 62, 7))
->Uint8Array.from : Symbol(Uint8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Uint8Array.from : Symbol(Uint8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Uint8Array : Symbol(Uint8Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Uint8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Uint8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 61, 47))
 
     typedArrays[2] = Int16Array.from(obj);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 62, 7))
->Int16Array.from : Symbol(Int16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Int16Array.from : Symbol(Int16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Int16Array : Symbol(Int16Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Int16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Int16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 61, 47))
 
     typedArrays[3] = Uint16Array.from(obj);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 62, 7))
->Uint16Array.from : Symbol(Uint16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Uint16Array.from : Symbol(Uint16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Uint16Array : Symbol(Uint16Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Uint16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Uint16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 61, 47))
 
     typedArrays[4] = Int32Array.from(obj);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 62, 7))
->Int32Array.from : Symbol(Int32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Int32Array.from : Symbol(Int32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Int32Array : Symbol(Int32Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Int32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Int32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 61, 47))
 
     typedArrays[5] = Uint32Array.from(obj);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 62, 7))
->Uint32Array.from : Symbol(Uint32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Uint32Array.from : Symbol(Uint32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Uint32Array : Symbol(Uint32Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Uint32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Uint32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 61, 47))
 
     typedArrays[6] = Float32Array.from(obj);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 62, 7))
->Float32Array.from : Symbol(Float32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Float32Array.from : Symbol(Float32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Float32Array : Symbol(Float32Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Float32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Float32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 61, 47))
 
     typedArrays[7] = Float64Array.from(obj);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 62, 7))
->Float64Array.from : Symbol(Float64ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Float64Array.from : Symbol(Float64ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Float64Array : Symbol(Float64Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Float64ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Float64ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 61, 47))
 
     typedArrays[8] = Uint8ClampedArray.from(obj);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 62, 7))
->Uint8ClampedArray.from : Symbol(Uint8ClampedArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Uint8ClampedArray.from : Symbol(Uint8ClampedArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Uint8ClampedArray : Symbol(Uint8ClampedArray, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Uint8ClampedArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Uint8ClampedArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 61, 47))
 
     return typedArrays;
@@ -458,73 +458,73 @@ function CreateTypedArraysFromMapFn(obj:ArrayLike<number>, mapFn: (n:number, v:n
 
     typedArrays[0] = Int8Array.from(obj, mapFn);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 107, 7))
->Int8Array.from : Symbol(Int8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Int8Array.from : Symbol(Int8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Int8Array : Symbol(Int8Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Int8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Int8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 106, 36))
 >mapFn : Symbol(mapFn, Decl(typedArrays.ts, 106, 58))
 
     typedArrays[1] = Uint8Array.from(obj, mapFn);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 107, 7))
->Uint8Array.from : Symbol(Uint8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Uint8Array.from : Symbol(Uint8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Uint8Array : Symbol(Uint8Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Uint8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Uint8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 106, 36))
 >mapFn : Symbol(mapFn, Decl(typedArrays.ts, 106, 58))
 
     typedArrays[2] = Int16Array.from(obj, mapFn);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 107, 7))
->Int16Array.from : Symbol(Int16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Int16Array.from : Symbol(Int16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Int16Array : Symbol(Int16Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Int16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Int16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 106, 36))
 >mapFn : Symbol(mapFn, Decl(typedArrays.ts, 106, 58))
 
     typedArrays[3] = Uint16Array.from(obj, mapFn);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 107, 7))
->Uint16Array.from : Symbol(Uint16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Uint16Array.from : Symbol(Uint16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Uint16Array : Symbol(Uint16Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Uint16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Uint16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 106, 36))
 >mapFn : Symbol(mapFn, Decl(typedArrays.ts, 106, 58))
 
     typedArrays[4] = Int32Array.from(obj, mapFn);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 107, 7))
->Int32Array.from : Symbol(Int32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Int32Array.from : Symbol(Int32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Int32Array : Symbol(Int32Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Int32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Int32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 106, 36))
 >mapFn : Symbol(mapFn, Decl(typedArrays.ts, 106, 58))
 
     typedArrays[5] = Uint32Array.from(obj, mapFn);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 107, 7))
->Uint32Array.from : Symbol(Uint32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Uint32Array.from : Symbol(Uint32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Uint32Array : Symbol(Uint32Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Uint32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Uint32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 106, 36))
 >mapFn : Symbol(mapFn, Decl(typedArrays.ts, 106, 58))
 
     typedArrays[6] = Float32Array.from(obj, mapFn);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 107, 7))
->Float32Array.from : Symbol(Float32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Float32Array.from : Symbol(Float32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Float32Array : Symbol(Float32Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Float32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Float32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 106, 36))
 >mapFn : Symbol(mapFn, Decl(typedArrays.ts, 106, 58))
 
     typedArrays[7] = Float64Array.from(obj, mapFn);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 107, 7))
->Float64Array.from : Symbol(Float64ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Float64Array.from : Symbol(Float64ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Float64Array : Symbol(Float64Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Float64ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Float64ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 106, 36))
 >mapFn : Symbol(mapFn, Decl(typedArrays.ts, 106, 58))
 
     typedArrays[8] = Uint8ClampedArray.from(obj, mapFn);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 107, 7))
->Uint8ClampedArray.from : Symbol(Uint8ClampedArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Uint8ClampedArray.from : Symbol(Uint8ClampedArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Uint8ClampedArray : Symbol(Uint8ClampedArray, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Uint8ClampedArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Uint8ClampedArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 106, 36))
 >mapFn : Symbol(mapFn, Decl(typedArrays.ts, 106, 58))
 
@@ -546,81 +546,81 @@ function CreateTypedArraysFromThisObj(obj:ArrayLike<number>, mapFn: (n:number, v
 
     typedArrays[0] = Int8Array.from(obj, mapFn, thisArg);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 122, 7))
->Int8Array.from : Symbol(Int8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Int8Array.from : Symbol(Int8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Int8Array : Symbol(Int8Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Int8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Int8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 121, 38))
 >mapFn : Symbol(mapFn, Decl(typedArrays.ts, 121, 60))
 >thisArg : Symbol(thisArg, Decl(typedArrays.ts, 121, 98))
 
     typedArrays[1] = Uint8Array.from(obj, mapFn, thisArg);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 122, 7))
->Uint8Array.from : Symbol(Uint8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Uint8Array.from : Symbol(Uint8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Uint8Array : Symbol(Uint8Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Uint8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Uint8ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 121, 38))
 >mapFn : Symbol(mapFn, Decl(typedArrays.ts, 121, 60))
 >thisArg : Symbol(thisArg, Decl(typedArrays.ts, 121, 98))
 
     typedArrays[2] = Int16Array.from(obj, mapFn, thisArg);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 122, 7))
->Int16Array.from : Symbol(Int16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Int16Array.from : Symbol(Int16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Int16Array : Symbol(Int16Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Int16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Int16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 121, 38))
 >mapFn : Symbol(mapFn, Decl(typedArrays.ts, 121, 60))
 >thisArg : Symbol(thisArg, Decl(typedArrays.ts, 121, 98))
 
     typedArrays[3] = Uint16Array.from(obj, mapFn, thisArg);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 122, 7))
->Uint16Array.from : Symbol(Uint16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Uint16Array.from : Symbol(Uint16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Uint16Array : Symbol(Uint16Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Uint16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Uint16ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 121, 38))
 >mapFn : Symbol(mapFn, Decl(typedArrays.ts, 121, 60))
 >thisArg : Symbol(thisArg, Decl(typedArrays.ts, 121, 98))
 
     typedArrays[4] = Int32Array.from(obj, mapFn, thisArg);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 122, 7))
->Int32Array.from : Symbol(Int32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Int32Array.from : Symbol(Int32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Int32Array : Symbol(Int32Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Int32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Int32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 121, 38))
 >mapFn : Symbol(mapFn, Decl(typedArrays.ts, 121, 60))
 >thisArg : Symbol(thisArg, Decl(typedArrays.ts, 121, 98))
 
     typedArrays[5] = Uint32Array.from(obj, mapFn, thisArg);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 122, 7))
->Uint32Array.from : Symbol(Uint32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Uint32Array.from : Symbol(Uint32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Uint32Array : Symbol(Uint32Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Uint32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Uint32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 121, 38))
 >mapFn : Symbol(mapFn, Decl(typedArrays.ts, 121, 60))
 >thisArg : Symbol(thisArg, Decl(typedArrays.ts, 121, 98))
 
     typedArrays[6] = Float32Array.from(obj, mapFn, thisArg);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 122, 7))
->Float32Array.from : Symbol(Float32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Float32Array.from : Symbol(Float32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Float32Array : Symbol(Float32Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Float32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Float32ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 121, 38))
 >mapFn : Symbol(mapFn, Decl(typedArrays.ts, 121, 60))
 >thisArg : Symbol(thisArg, Decl(typedArrays.ts, 121, 98))
 
     typedArrays[7] = Float64Array.from(obj, mapFn, thisArg);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 122, 7))
->Float64Array.from : Symbol(Float64ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Float64Array.from : Symbol(Float64ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Float64Array : Symbol(Float64Array, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Float64ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Float64ArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 121, 38))
 >mapFn : Symbol(mapFn, Decl(typedArrays.ts, 121, 60))
 >thisArg : Symbol(thisArg, Decl(typedArrays.ts, 121, 98))
 
     typedArrays[8] = Uint8ClampedArray.from(obj, mapFn, thisArg);
 >typedArrays : Symbol(typedArrays, Decl(typedArrays.ts, 122, 7))
->Uint8ClampedArray.from : Symbol(Uint8ClampedArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>Uint8ClampedArray.from : Symbol(Uint8ClampedArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >Uint8ClampedArray : Symbol(Uint8ClampedArray, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.symbol.wellknown.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
->from : Symbol(Uint8ClampedArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
+>from : Symbol(Uint8ClampedArrayConstructor.from, Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es5.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --), Decl(lib.es2015.iterable.d.ts, --, --))
 >obj : Symbol(obj, Decl(typedArrays.ts, 121, 38))
 >mapFn : Symbol(mapFn, Decl(typedArrays.ts, 121, 60))
 >thisArg : Symbol(thisArg, Decl(typedArrays.ts, 121, 98))
diff --git a/tests/baselines/reference/typedArrays.types b/tests/baselines/reference/typedArrays.types
index 444d6a74e43..24924a5810e 100644
--- a/tests/baselines/reference/typedArrays.types
+++ b/tests/baselines/reference/typedArrays.types
@@ -274,9 +274,9 @@ function CreateIntegerTypedArraysFromArray2(obj:number[]) {
 >typedArrays : any[]
 >0 : 0
 >Int8Array.from(obj) : Int8Array
->Int8Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int8Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int8Array; }
+>Int8Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int8Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int8Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int8Array; (arrayLike: ArrayLike<number>): Int8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int8Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int8Array; (arrayLike: Iterable<number>): Int8Array; }
 >Int8Array : Int8ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int8Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int8Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int8Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int8Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int8Array; (arrayLike: ArrayLike<number>): Int8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int8Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int8Array; (arrayLike: Iterable<number>): Int8Array; }
 >obj : number[]
 
     typedArrays[1] = Uint8Array.from(obj);
@@ -285,9 +285,9 @@ function CreateIntegerTypedArraysFromArray2(obj:number[]) {
 >typedArrays : any[]
 >1 : 1
 >Uint8Array.from(obj) : Uint8Array
->Uint8Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8Array; }
+>Uint8Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8Array; (arrayLike: ArrayLike<number>): Uint8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8Array; (arrayLike: Iterable<number>): Uint8Array; }
 >Uint8Array : Uint8ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8Array; (arrayLike: ArrayLike<number>): Uint8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8Array; (arrayLike: Iterable<number>): Uint8Array; }
 >obj : number[]
 
     typedArrays[2] = Int16Array.from(obj);
@@ -296,9 +296,9 @@ function CreateIntegerTypedArraysFromArray2(obj:number[]) {
 >typedArrays : any[]
 >2 : 2
 >Int16Array.from(obj) : Int16Array
->Int16Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int16Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int16Array; }
+>Int16Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int16Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int16Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int16Array; (arrayLike: ArrayLike<number>): Int16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int16Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int16Array; (arrayLike: Iterable<number>): Int16Array; }
 >Int16Array : Int16ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int16Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int16Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int16Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int16Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int16Array; (arrayLike: ArrayLike<number>): Int16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int16Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int16Array; (arrayLike: Iterable<number>): Int16Array; }
 >obj : number[]
 
     typedArrays[3] = Uint16Array.from(obj);
@@ -307,9 +307,9 @@ function CreateIntegerTypedArraysFromArray2(obj:number[]) {
 >typedArrays : any[]
 >3 : 3
 >Uint16Array.from(obj) : Uint16Array
->Uint16Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint16Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint16Array; }
+>Uint16Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint16Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint16Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint16Array; (arrayLike: ArrayLike<number>): Uint16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint16Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint16Array; (arrayLike: Iterable<number>): Uint16Array; }
 >Uint16Array : Uint16ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint16Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint16Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint16Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint16Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint16Array; (arrayLike: ArrayLike<number>): Uint16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint16Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint16Array; (arrayLike: Iterable<number>): Uint16Array; }
 >obj : number[]
 
     typedArrays[4] = Int32Array.from(obj);
@@ -318,9 +318,9 @@ function CreateIntegerTypedArraysFromArray2(obj:number[]) {
 >typedArrays : any[]
 >4 : 4
 >Int32Array.from(obj) : Int32Array
->Int32Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int32Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int32Array; }
+>Int32Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int32Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int32Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int32Array; (arrayLike: ArrayLike<number>): Int32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int32Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int32Array; (arrayLike: Iterable<number>): Int32Array; }
 >Int32Array : Int32ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int32Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int32Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int32Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int32Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int32Array; (arrayLike: ArrayLike<number>): Int32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int32Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int32Array; (arrayLike: Iterable<number>): Int32Array; }
 >obj : number[]
 
     typedArrays[5] = Uint32Array.from(obj);
@@ -329,9 +329,9 @@ function CreateIntegerTypedArraysFromArray2(obj:number[]) {
 >typedArrays : any[]
 >5 : 5
 >Uint32Array.from(obj) : Uint32Array
->Uint32Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint32Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint32Array; }
+>Uint32Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint32Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint32Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint32Array; (arrayLike: ArrayLike<number>): Uint32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint32Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint32Array; (arrayLike: Iterable<number>): Uint32Array; }
 >Uint32Array : Uint32ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint32Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint32Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint32Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint32Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint32Array; (arrayLike: ArrayLike<number>): Uint32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint32Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint32Array; (arrayLike: Iterable<number>): Uint32Array; }
 >obj : number[]
 
     typedArrays[6] = Float32Array.from(obj);
@@ -340,9 +340,9 @@ function CreateIntegerTypedArraysFromArray2(obj:number[]) {
 >typedArrays : any[]
 >6 : 6
 >Float32Array.from(obj) : Float32Array
->Float32Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float32Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float32Array; }
+>Float32Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Float32Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float32Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float32Array; (arrayLike: ArrayLike<number>): Float32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Float32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float32Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float32Array; (arrayLike: Iterable<number>): Float32Array; }
 >Float32Array : Float32ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float32Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float32Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Float32Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float32Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float32Array; (arrayLike: ArrayLike<number>): Float32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Float32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float32Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float32Array; (arrayLike: Iterable<number>): Float32Array; }
 >obj : number[]
 
     typedArrays[7] = Float64Array.from(obj);
@@ -351,9 +351,9 @@ function CreateIntegerTypedArraysFromArray2(obj:number[]) {
 >typedArrays : any[]
 >7 : 7
 >Float64Array.from(obj) : Float64Array
->Float64Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float64Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float64Array; }
+>Float64Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Float64Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float64Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float64Array; (arrayLike: ArrayLike<number>): Float64Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Float64Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float64Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float64Array; (arrayLike: Iterable<number>): Float64Array; }
 >Float64Array : Float64ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float64Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float64Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Float64Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float64Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float64Array; (arrayLike: ArrayLike<number>): Float64Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Float64Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float64Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float64Array; (arrayLike: Iterable<number>): Float64Array; }
 >obj : number[]
 
     typedArrays[8] = Uint8ClampedArray.from(obj);
@@ -362,9 +362,9 @@ function CreateIntegerTypedArraysFromArray2(obj:number[]) {
 >typedArrays : any[]
 >8 : 8
 >Uint8ClampedArray.from(obj) : Uint8ClampedArray
->Uint8ClampedArray.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8ClampedArray; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8ClampedArray; }
+>Uint8ClampedArray.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8ClampedArray; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8ClampedArray; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8ClampedArray; (arrayLike: ArrayLike<number>): Uint8ClampedArray; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8ClampedArray; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8ClampedArray; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8ClampedArray; (arrayLike: Iterable<number>): Uint8ClampedArray; }
 >Uint8ClampedArray : Uint8ClampedArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8ClampedArray; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8ClampedArray; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8ClampedArray; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8ClampedArray; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8ClampedArray; (arrayLike: ArrayLike<number>): Uint8ClampedArray; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8ClampedArray; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8ClampedArray; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8ClampedArray; (arrayLike: Iterable<number>): Uint8ClampedArray; }
 >obj : number[]
 
     return typedArrays;
@@ -386,9 +386,9 @@ function CreateIntegerTypedArraysFromArrayLike(obj:ArrayLike<number>) {
 >typedArrays : any[]
 >0 : 0
 >Int8Array.from(obj) : Int8Array
->Int8Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int8Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int8Array; }
+>Int8Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int8Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int8Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int8Array; (arrayLike: ArrayLike<number>): Int8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int8Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int8Array; (arrayLike: Iterable<number>): Int8Array; }
 >Int8Array : Int8ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int8Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int8Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int8Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int8Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int8Array; (arrayLike: ArrayLike<number>): Int8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int8Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int8Array; (arrayLike: Iterable<number>): Int8Array; }
 >obj : ArrayLike<number>
 
     typedArrays[1] = Uint8Array.from(obj);
@@ -397,9 +397,9 @@ function CreateIntegerTypedArraysFromArrayLike(obj:ArrayLike<number>) {
 >typedArrays : any[]
 >1 : 1
 >Uint8Array.from(obj) : Uint8Array
->Uint8Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8Array; }
+>Uint8Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8Array; (arrayLike: ArrayLike<number>): Uint8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8Array; (arrayLike: Iterable<number>): Uint8Array; }
 >Uint8Array : Uint8ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8Array; (arrayLike: ArrayLike<number>): Uint8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8Array; (arrayLike: Iterable<number>): Uint8Array; }
 >obj : ArrayLike<number>
 
     typedArrays[2] = Int16Array.from(obj);
@@ -408,9 +408,9 @@ function CreateIntegerTypedArraysFromArrayLike(obj:ArrayLike<number>) {
 >typedArrays : any[]
 >2 : 2
 >Int16Array.from(obj) : Int16Array
->Int16Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int16Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int16Array; }
+>Int16Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int16Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int16Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int16Array; (arrayLike: ArrayLike<number>): Int16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int16Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int16Array; (arrayLike: Iterable<number>): Int16Array; }
 >Int16Array : Int16ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int16Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int16Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int16Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int16Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int16Array; (arrayLike: ArrayLike<number>): Int16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int16Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int16Array; (arrayLike: Iterable<number>): Int16Array; }
 >obj : ArrayLike<number>
 
     typedArrays[3] = Uint16Array.from(obj);
@@ -419,9 +419,9 @@ function CreateIntegerTypedArraysFromArrayLike(obj:ArrayLike<number>) {
 >typedArrays : any[]
 >3 : 3
 >Uint16Array.from(obj) : Uint16Array
->Uint16Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint16Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint16Array; }
+>Uint16Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint16Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint16Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint16Array; (arrayLike: ArrayLike<number>): Uint16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint16Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint16Array; (arrayLike: Iterable<number>): Uint16Array; }
 >Uint16Array : Uint16ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint16Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint16Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint16Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint16Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint16Array; (arrayLike: ArrayLike<number>): Uint16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint16Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint16Array; (arrayLike: Iterable<number>): Uint16Array; }
 >obj : ArrayLike<number>
 
     typedArrays[4] = Int32Array.from(obj);
@@ -430,9 +430,9 @@ function CreateIntegerTypedArraysFromArrayLike(obj:ArrayLike<number>) {
 >typedArrays : any[]
 >4 : 4
 >Int32Array.from(obj) : Int32Array
->Int32Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int32Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int32Array; }
+>Int32Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int32Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int32Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int32Array; (arrayLike: ArrayLike<number>): Int32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int32Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int32Array; (arrayLike: Iterable<number>): Int32Array; }
 >Int32Array : Int32ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int32Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int32Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int32Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int32Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int32Array; (arrayLike: ArrayLike<number>): Int32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int32Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int32Array; (arrayLike: Iterable<number>): Int32Array; }
 >obj : ArrayLike<number>
 
     typedArrays[5] = Uint32Array.from(obj);
@@ -441,9 +441,9 @@ function CreateIntegerTypedArraysFromArrayLike(obj:ArrayLike<number>) {
 >typedArrays : any[]
 >5 : 5
 >Uint32Array.from(obj) : Uint32Array
->Uint32Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint32Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint32Array; }
+>Uint32Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint32Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint32Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint32Array; (arrayLike: ArrayLike<number>): Uint32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint32Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint32Array; (arrayLike: Iterable<number>): Uint32Array; }
 >Uint32Array : Uint32ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint32Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint32Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint32Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint32Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint32Array; (arrayLike: ArrayLike<number>): Uint32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint32Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint32Array; (arrayLike: Iterable<number>): Uint32Array; }
 >obj : ArrayLike<number>
 
     typedArrays[6] = Float32Array.from(obj);
@@ -452,9 +452,9 @@ function CreateIntegerTypedArraysFromArrayLike(obj:ArrayLike<number>) {
 >typedArrays : any[]
 >6 : 6
 >Float32Array.from(obj) : Float32Array
->Float32Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float32Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float32Array; }
+>Float32Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Float32Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float32Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float32Array; (arrayLike: ArrayLike<number>): Float32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Float32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float32Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float32Array; (arrayLike: Iterable<number>): Float32Array; }
 >Float32Array : Float32ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float32Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float32Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Float32Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float32Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float32Array; (arrayLike: ArrayLike<number>): Float32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Float32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float32Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float32Array; (arrayLike: Iterable<number>): Float32Array; }
 >obj : ArrayLike<number>
 
     typedArrays[7] = Float64Array.from(obj);
@@ -463,9 +463,9 @@ function CreateIntegerTypedArraysFromArrayLike(obj:ArrayLike<number>) {
 >typedArrays : any[]
 >7 : 7
 >Float64Array.from(obj) : Float64Array
->Float64Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float64Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float64Array; }
+>Float64Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Float64Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float64Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float64Array; (arrayLike: ArrayLike<number>): Float64Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Float64Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float64Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float64Array; (arrayLike: Iterable<number>): Float64Array; }
 >Float64Array : Float64ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float64Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float64Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Float64Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float64Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float64Array; (arrayLike: ArrayLike<number>): Float64Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Float64Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float64Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float64Array; (arrayLike: Iterable<number>): Float64Array; }
 >obj : ArrayLike<number>
 
     typedArrays[8] = Uint8ClampedArray.from(obj);
@@ -474,9 +474,9 @@ function CreateIntegerTypedArraysFromArrayLike(obj:ArrayLike<number>) {
 >typedArrays : any[]
 >8 : 8
 >Uint8ClampedArray.from(obj) : Uint8ClampedArray
->Uint8ClampedArray.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8ClampedArray; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8ClampedArray; }
+>Uint8ClampedArray.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8ClampedArray; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8ClampedArray; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8ClampedArray; (arrayLike: ArrayLike<number>): Uint8ClampedArray; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8ClampedArray; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8ClampedArray; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8ClampedArray; (arrayLike: Iterable<number>): Uint8ClampedArray; }
 >Uint8ClampedArray : Uint8ClampedArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8ClampedArray; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8ClampedArray; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8ClampedArray; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8ClampedArray; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8ClampedArray; (arrayLike: ArrayLike<number>): Uint8ClampedArray; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8ClampedArray; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8ClampedArray; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8ClampedArray; (arrayLike: Iterable<number>): Uint8ClampedArray; }
 >obj : ArrayLike<number>
 
     return typedArrays;
@@ -758,9 +758,9 @@ function CreateTypedArraysFromMapFn(obj:ArrayLike<number>, mapFn: (n:number, v:n
 >typedArrays : any[]
 >0 : 0
 >Int8Array.from(obj, mapFn) : Int8Array
->Int8Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int8Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int8Array; }
+>Int8Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int8Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int8Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int8Array; (arrayLike: ArrayLike<number>): Int8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int8Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int8Array; (arrayLike: Iterable<number>): Int8Array; }
 >Int8Array : Int8ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int8Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int8Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int8Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int8Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int8Array; (arrayLike: ArrayLike<number>): Int8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int8Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int8Array; (arrayLike: Iterable<number>): Int8Array; }
 >obj : ArrayLike<number>
 >mapFn : (n: number, v: number) => number
 
@@ -770,9 +770,9 @@ function CreateTypedArraysFromMapFn(obj:ArrayLike<number>, mapFn: (n:number, v:n
 >typedArrays : any[]
 >1 : 1
 >Uint8Array.from(obj, mapFn) : Uint8Array
->Uint8Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8Array; }
+>Uint8Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8Array; (arrayLike: ArrayLike<number>): Uint8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8Array; (arrayLike: Iterable<number>): Uint8Array; }
 >Uint8Array : Uint8ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8Array; (arrayLike: ArrayLike<number>): Uint8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8Array; (arrayLike: Iterable<number>): Uint8Array; }
 >obj : ArrayLike<number>
 >mapFn : (n: number, v: number) => number
 
@@ -782,9 +782,9 @@ function CreateTypedArraysFromMapFn(obj:ArrayLike<number>, mapFn: (n:number, v:n
 >typedArrays : any[]
 >2 : 2
 >Int16Array.from(obj, mapFn) : Int16Array
->Int16Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int16Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int16Array; }
+>Int16Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int16Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int16Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int16Array; (arrayLike: ArrayLike<number>): Int16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int16Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int16Array; (arrayLike: Iterable<number>): Int16Array; }
 >Int16Array : Int16ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int16Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int16Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int16Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int16Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int16Array; (arrayLike: ArrayLike<number>): Int16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int16Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int16Array; (arrayLike: Iterable<number>): Int16Array; }
 >obj : ArrayLike<number>
 >mapFn : (n: number, v: number) => number
 
@@ -794,9 +794,9 @@ function CreateTypedArraysFromMapFn(obj:ArrayLike<number>, mapFn: (n:number, v:n
 >typedArrays : any[]
 >3 : 3
 >Uint16Array.from(obj, mapFn) : Uint16Array
->Uint16Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint16Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint16Array; }
+>Uint16Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint16Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint16Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint16Array; (arrayLike: ArrayLike<number>): Uint16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint16Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint16Array; (arrayLike: Iterable<number>): Uint16Array; }
 >Uint16Array : Uint16ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint16Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint16Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint16Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint16Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint16Array; (arrayLike: ArrayLike<number>): Uint16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint16Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint16Array; (arrayLike: Iterable<number>): Uint16Array; }
 >obj : ArrayLike<number>
 >mapFn : (n: number, v: number) => number
 
@@ -806,9 +806,9 @@ function CreateTypedArraysFromMapFn(obj:ArrayLike<number>, mapFn: (n:number, v:n
 >typedArrays : any[]
 >4 : 4
 >Int32Array.from(obj, mapFn) : Int32Array
->Int32Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int32Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int32Array; }
+>Int32Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int32Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int32Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int32Array; (arrayLike: ArrayLike<number>): Int32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int32Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int32Array; (arrayLike: Iterable<number>): Int32Array; }
 >Int32Array : Int32ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int32Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int32Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int32Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int32Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int32Array; (arrayLike: ArrayLike<number>): Int32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int32Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int32Array; (arrayLike: Iterable<number>): Int32Array; }
 >obj : ArrayLike<number>
 >mapFn : (n: number, v: number) => number
 
@@ -818,9 +818,9 @@ function CreateTypedArraysFromMapFn(obj:ArrayLike<number>, mapFn: (n:number, v:n
 >typedArrays : any[]
 >5 : 5
 >Uint32Array.from(obj, mapFn) : Uint32Array
->Uint32Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint32Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint32Array; }
+>Uint32Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint32Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint32Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint32Array; (arrayLike: ArrayLike<number>): Uint32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint32Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint32Array; (arrayLike: Iterable<number>): Uint32Array; }
 >Uint32Array : Uint32ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint32Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint32Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint32Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint32Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint32Array; (arrayLike: ArrayLike<number>): Uint32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint32Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint32Array; (arrayLike: Iterable<number>): Uint32Array; }
 >obj : ArrayLike<number>
 >mapFn : (n: number, v: number) => number
 
@@ -830,9 +830,9 @@ function CreateTypedArraysFromMapFn(obj:ArrayLike<number>, mapFn: (n:number, v:n
 >typedArrays : any[]
 >6 : 6
 >Float32Array.from(obj, mapFn) : Float32Array
->Float32Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float32Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float32Array; }
+>Float32Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Float32Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float32Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float32Array; (arrayLike: ArrayLike<number>): Float32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Float32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float32Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float32Array; (arrayLike: Iterable<number>): Float32Array; }
 >Float32Array : Float32ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float32Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float32Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Float32Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float32Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float32Array; (arrayLike: ArrayLike<number>): Float32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Float32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float32Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float32Array; (arrayLike: Iterable<number>): Float32Array; }
 >obj : ArrayLike<number>
 >mapFn : (n: number, v: number) => number
 
@@ -842,9 +842,9 @@ function CreateTypedArraysFromMapFn(obj:ArrayLike<number>, mapFn: (n:number, v:n
 >typedArrays : any[]
 >7 : 7
 >Float64Array.from(obj, mapFn) : Float64Array
->Float64Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float64Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float64Array; }
+>Float64Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Float64Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float64Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float64Array; (arrayLike: ArrayLike<number>): Float64Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Float64Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float64Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float64Array; (arrayLike: Iterable<number>): Float64Array; }
 >Float64Array : Float64ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float64Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float64Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Float64Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float64Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float64Array; (arrayLike: ArrayLike<number>): Float64Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Float64Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float64Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float64Array; (arrayLike: Iterable<number>): Float64Array; }
 >obj : ArrayLike<number>
 >mapFn : (n: number, v: number) => number
 
@@ -854,9 +854,9 @@ function CreateTypedArraysFromMapFn(obj:ArrayLike<number>, mapFn: (n:number, v:n
 >typedArrays : any[]
 >8 : 8
 >Uint8ClampedArray.from(obj, mapFn) : Uint8ClampedArray
->Uint8ClampedArray.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8ClampedArray; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8ClampedArray; }
+>Uint8ClampedArray.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8ClampedArray; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8ClampedArray; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8ClampedArray; (arrayLike: ArrayLike<number>): Uint8ClampedArray; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8ClampedArray; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8ClampedArray; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8ClampedArray; (arrayLike: Iterable<number>): Uint8ClampedArray; }
 >Uint8ClampedArray : Uint8ClampedArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8ClampedArray; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8ClampedArray; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8ClampedArray; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8ClampedArray; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8ClampedArray; (arrayLike: ArrayLike<number>): Uint8ClampedArray; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8ClampedArray; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8ClampedArray; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8ClampedArray; (arrayLike: Iterable<number>): Uint8ClampedArray; }
 >obj : ArrayLike<number>
 >mapFn : (n: number, v: number) => number
 
@@ -883,9 +883,9 @@ function CreateTypedArraysFromThisObj(obj:ArrayLike<number>, mapFn: (n:number, v
 >typedArrays : any[]
 >0 : 0
 >Int8Array.from(obj, mapFn, thisArg) : Int8Array
->Int8Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int8Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int8Array; }
+>Int8Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int8Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int8Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int8Array; (arrayLike: ArrayLike<number>): Int8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int8Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int8Array; (arrayLike: Iterable<number>): Int8Array; }
 >Int8Array : Int8ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int8Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int8Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int8Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int8Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int8Array; (arrayLike: ArrayLike<number>): Int8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int8Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int8Array; (arrayLike: Iterable<number>): Int8Array; }
 >obj : ArrayLike<number>
 >mapFn : (n: number, v: number) => number
 >thisArg : {}
@@ -896,9 +896,9 @@ function CreateTypedArraysFromThisObj(obj:ArrayLike<number>, mapFn: (n:number, v
 >typedArrays : any[]
 >1 : 1
 >Uint8Array.from(obj, mapFn, thisArg) : Uint8Array
->Uint8Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8Array; }
+>Uint8Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8Array; (arrayLike: ArrayLike<number>): Uint8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8Array; (arrayLike: Iterable<number>): Uint8Array; }
 >Uint8Array : Uint8ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8Array; (arrayLike: ArrayLike<number>): Uint8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8Array; (arrayLike: Iterable<number>): Uint8Array; }
 >obj : ArrayLike<number>
 >mapFn : (n: number, v: number) => number
 >thisArg : {}
@@ -909,9 +909,9 @@ function CreateTypedArraysFromThisObj(obj:ArrayLike<number>, mapFn: (n:number, v
 >typedArrays : any[]
 >2 : 2
 >Int16Array.from(obj, mapFn, thisArg) : Int16Array
->Int16Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int16Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int16Array; }
+>Int16Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int16Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int16Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int16Array; (arrayLike: ArrayLike<number>): Int16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int16Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int16Array; (arrayLike: Iterable<number>): Int16Array; }
 >Int16Array : Int16ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int16Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int16Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int16Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int16Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int16Array; (arrayLike: ArrayLike<number>): Int16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int16Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int16Array; (arrayLike: Iterable<number>): Int16Array; }
 >obj : ArrayLike<number>
 >mapFn : (n: number, v: number) => number
 >thisArg : {}
@@ -922,9 +922,9 @@ function CreateTypedArraysFromThisObj(obj:ArrayLike<number>, mapFn: (n:number, v
 >typedArrays : any[]
 >3 : 3
 >Uint16Array.from(obj, mapFn, thisArg) : Uint16Array
->Uint16Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint16Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint16Array; }
+>Uint16Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint16Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint16Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint16Array; (arrayLike: ArrayLike<number>): Uint16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint16Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint16Array; (arrayLike: Iterable<number>): Uint16Array; }
 >Uint16Array : Uint16ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint16Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint16Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint16Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint16Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint16Array; (arrayLike: ArrayLike<number>): Uint16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint16Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint16Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint16Array; (arrayLike: Iterable<number>): Uint16Array; }
 >obj : ArrayLike<number>
 >mapFn : (n: number, v: number) => number
 >thisArg : {}
@@ -935,9 +935,9 @@ function CreateTypedArraysFromThisObj(obj:ArrayLike<number>, mapFn: (n:number, v
 >typedArrays : any[]
 >4 : 4
 >Int32Array.from(obj, mapFn, thisArg) : Int32Array
->Int32Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int32Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int32Array; }
+>Int32Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int32Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int32Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int32Array; (arrayLike: ArrayLike<number>): Int32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int32Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int32Array; (arrayLike: Iterable<number>): Int32Array; }
 >Int32Array : Int32ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int32Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Int32Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Int32Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int32Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int32Array; (arrayLike: ArrayLike<number>): Int32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Int32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Int32Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Int32Array; (arrayLike: Iterable<number>): Int32Array; }
 >obj : ArrayLike<number>
 >mapFn : (n: number, v: number) => number
 >thisArg : {}
@@ -948,9 +948,9 @@ function CreateTypedArraysFromThisObj(obj:ArrayLike<number>, mapFn: (n:number, v
 >typedArrays : any[]
 >5 : 5
 >Uint32Array.from(obj, mapFn, thisArg) : Uint32Array
->Uint32Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint32Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint32Array; }
+>Uint32Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint32Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint32Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint32Array; (arrayLike: ArrayLike<number>): Uint32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint32Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint32Array; (arrayLike: Iterable<number>): Uint32Array; }
 >Uint32Array : Uint32ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint32Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint32Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint32Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint32Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint32Array; (arrayLike: ArrayLike<number>): Uint32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint32Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint32Array; (arrayLike: Iterable<number>): Uint32Array; }
 >obj : ArrayLike<number>
 >mapFn : (n: number, v: number) => number
 >thisArg : {}
@@ -961,9 +961,9 @@ function CreateTypedArraysFromThisObj(obj:ArrayLike<number>, mapFn: (n:number, v
 >typedArrays : any[]
 >6 : 6
 >Float32Array.from(obj, mapFn, thisArg) : Float32Array
->Float32Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float32Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float32Array; }
+>Float32Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Float32Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float32Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float32Array; (arrayLike: ArrayLike<number>): Float32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Float32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float32Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float32Array; (arrayLike: Iterable<number>): Float32Array; }
 >Float32Array : Float32ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float32Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float32Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Float32Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float32Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float32Array; (arrayLike: ArrayLike<number>): Float32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Float32Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float32Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float32Array; (arrayLike: Iterable<number>): Float32Array; }
 >obj : ArrayLike<number>
 >mapFn : (n: number, v: number) => number
 >thisArg : {}
@@ -974,9 +974,9 @@ function CreateTypedArraysFromThisObj(obj:ArrayLike<number>, mapFn: (n:number, v
 >typedArrays : any[]
 >7 : 7
 >Float64Array.from(obj, mapFn, thisArg) : Float64Array
->Float64Array.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float64Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float64Array; }
+>Float64Array.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Float64Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float64Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float64Array; (arrayLike: ArrayLike<number>): Float64Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Float64Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float64Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float64Array; (arrayLike: Iterable<number>): Float64Array; }
 >Float64Array : Float64ArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float64Array; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Float64Array; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Float64Array; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float64Array; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float64Array; (arrayLike: ArrayLike<number>): Float64Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Float64Array; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Float64Array; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Float64Array; (arrayLike: Iterable<number>): Float64Array; }
 >obj : ArrayLike<number>
 >mapFn : (n: number, v: number) => number
 >thisArg : {}
@@ -987,9 +987,9 @@ function CreateTypedArraysFromThisObj(obj:ArrayLike<number>, mapFn: (n:number, v
 >typedArrays : any[]
 >8 : 8
 >Uint8ClampedArray.from(obj, mapFn, thisArg) : Uint8ClampedArray
->Uint8ClampedArray.from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8ClampedArray; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8ClampedArray; }
+>Uint8ClampedArray.from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8ClampedArray; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8ClampedArray; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8ClampedArray; (arrayLike: ArrayLike<number>): Uint8ClampedArray; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8ClampedArray; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8ClampedArray; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8ClampedArray; (arrayLike: Iterable<number>): Uint8ClampedArray; }
 >Uint8ClampedArray : Uint8ClampedArrayConstructor
->from : { (arrayLike: ArrayLike<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8ClampedArray; (arrayLike: Iterable<number>, mapfn?: (v: number, k: number) => number, thisArg?: any): Uint8ClampedArray; }
+>from : { (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8ClampedArray; (arrayLike: ArrayLike<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8ClampedArray; <Z>(arrayLike: ArrayLike<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8ClampedArray; (arrayLike: ArrayLike<number>): Uint8ClampedArray; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number): Uint8ClampedArray; (arrayLike: Iterable<number>, mapfn: (this: undefined, v: number, k: number) => number, thisArg: undefined): Uint8ClampedArray; <Z>(arrayLike: Iterable<number>, mapfn: (this: Z, v: number, k: number) => number, thisArg: Z): Uint8ClampedArray; (arrayLike: Iterable<number>): Uint8ClampedArray; }
 >obj : ArrayLike<number>
 >mapFn : (n: number, v: number) => number
 >thisArg : {}
diff --git a/tests/cases/compiler/indexedAccessTypeConstraints.ts b/tests/cases/compiler/indexedAccessTypeConstraints.ts
new file mode 100644
index 00000000000..c1c1bca198b
--- /dev/null
+++ b/tests/cases/compiler/indexedAccessTypeConstraints.ts
@@ -0,0 +1,36 @@
+// @strict: true
+
+// Repro from #14557
+
+interface IData<T> {
+    content: T;
+}
+
+type Data<T> = {
+    get: <K extends keyof T>(prop: K) => T[K];
+};
+
+class Parent<M> {
+    private data: Data<M>;
+    getData(): Data<M> {
+        return this.data;
+    }
+}
+
+export class Foo<C> extends Parent<IData<C>> {
+    getContent(): C {
+        return this.getData().get('content');
+    }
+}
+
+export class Bar<C, T extends IData<C>> extends Parent<T> {
+    getContent(): C {
+        return this.getData().get('content');
+    }
+}
+
+// Repro from #14557
+
+function foo<C, T extends { content: C }>(x: C, y: T['content']) {
+    x = y;
+}
diff --git a/tests/cases/compiler/thisTypeInNativeThisAssignableMethods.ts b/tests/cases/compiler/thisTypeInNativeThisAssignableMethods.ts
new file mode 100644
index 00000000000..17ff41c70a7
--- /dev/null
+++ b/tests/cases/compiler/thisTypeInNativeThisAssignableMethods.ts
@@ -0,0 +1,398 @@
+// @target: ES2017
+
+class A {
+    options: string[];
+
+    addOptions(options: string[]) {
+        if (!this.options) {
+            this.options = [];
+        }
+        options.forEach(function (item) {
+            this.options.push(item);
+        }, this);
+        return this;
+    }
+
+    testUndefined(options: string[]) {
+        const undefinedArr: Array<undefined> = []
+        options.forEach(function () {
+            undefinedArr.push(this);
+        }); // case1
+        options.forEach(function () {
+            undefinedArr.push(this);
+        }, undefined); // case2
+        options.forEach(function () {
+            undefinedArr.push(this);
+        }, null); // case3
+
+        const arrLike = {} as ArrayLike<number>
+        Array.from(arrLike, function (item) {
+            return this === undefined ? 2 : 1;
+        }, undefined)
+
+        const iterLike = [] as Iterable<number>
+        Array.from(iterLike, function (item) {
+            return this === undefined ? 2 : 1;
+        }, undefined)
+    }
+
+    test(options: string[]) {
+        const thisObject = {
+            options: [] as string[]
+        };
+
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        const arrLike = {} as ArrayLike<number>
+        Array.from(arrLike, function (item) {
+            return this.options[item].length
+        }, thisObject)
+
+        const iterLike = [] as Iterable<number>
+        Array.from(iterLike, function (item) {
+            return this.options[item].length
+        }, thisObject)
+    }
+
+    test1(options: string[]) {
+        const thisObject = {
+            options: [] as ReadonlyArray<string>
+        };
+
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+
+    test2(options: Int8Array[]) {
+        const thisObject = {
+            options: [] as Int8Array[]
+        };
+
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+
+    test3(options: Uint8Array[]) {
+        const thisObject = {
+            options: [] as Uint8Array[]
+        };
+
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+
+    test4(options: Float32Array[]) {
+        const thisObject = {
+            options: [] as Float32Array[]
+        };
+
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+
+    test5(options: Uint8ClampedArray[]) {
+        const thisObject = {
+            options: [] as Uint8ClampedArray[]
+        };
+
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+
+    test6(options: Int16Array[]) {
+        const thisObject = {
+            options: [] as Int16Array[]
+        };
+
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+
+    test7(options: Uint16Array[]) {
+        const thisObject = {
+            options: [] as Uint16Array[]
+        };
+
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+
+    test8(options: Uint32Array[]) {
+        const thisObject = {
+            options: [] as Uint32Array[]
+        };
+
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+
+    test9(options: Float64Array[]) {
+        const thisObject = {
+            options: [] as Float64Array[]
+        };
+
+        options.find(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.findIndex(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.forEach(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.map(function (val, index) {
+            if (val === this.options[index])
+                return this.options[index];
+        }, thisObject);
+
+        options.some(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.filter(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+
+        options.every(function (val, index) {
+            return val === this.options[index];
+        }, thisObject);
+    }
+}
diff --git a/tests/cases/conformance/salsa/inferringClassMembersFromAssignments.ts b/tests/cases/conformance/salsa/inferringClassMembersFromAssignments.ts
index d843e86b725..9cf02a9c7dd 100644
--- a/tests/cases/conformance/salsa/inferringClassMembersFromAssignments.ts
+++ b/tests/cases/conformance/salsa/inferringClassMembersFromAssignments.ts
@@ -21,6 +21,15 @@ class C {
             this.inMethod = "string"
         }
         this.inMultiple = "string";
+
+        var action = () => {
+            if (Math.random()) {
+                this.inNestedArrowFunction = 0;
+            }
+            else {
+                this.inNestedArrowFunction = "string"
+            }
+        };
     }
     get() {
         if (Math.random()) {
@@ -39,6 +48,14 @@ class C {
             this.inSetter = "string"
         }
     }
+    prop = () => {
+        if (Math.random()) {
+            this.inPropertyDeclaration = 0;
+        }
+        else {
+            this.inPropertyDeclaration = "string"
+        }
+    }
     static method() {
         if (Math.random()) {
             this.inStaticMethod = 0;
@@ -46,6 +63,15 @@ class C {
         else {
             this.inStaticMethod = "string"
         }
+
+        var action = () => {
+            if (Math.random()) {
+                this.inStaticNestedArrowFunction = 0;
+            }
+            else {
+                this.inStaticNestedArrowFunction = "string"
+            }
+        };
     }
     static get() {
         if (Math.random()) {
@@ -63,6 +89,14 @@ class C {
             this.inStaticSetter = "string"
         }
     }
+    static prop = () => {
+        if (Math.random()) {
+            this.inStaticPropertyDeclaration = 0;
+        }
+        else {
+            this.inStaticPropertyDeclaration = "string"
+        }
+    }
 }
 
 // @filename: b.ts
@@ -76,6 +110,8 @@ var stringOrNumberOrUndefined: string | number | undefined;
 var stringOrNumberOrUndefined = c.inMethod;
 var stringOrNumberOrUndefined = c.inGetter;
 var stringOrNumberOrUndefined = c.inSetter;
+var stringOrNumberOrUndefined = c.inPropertyDeclaration;
+var stringOrNumberOrUndefined = c.inNestedArrowFunction
 
 var stringOrNumberOrBoolean: string | number | boolean;
 
@@ -85,3 +121,5 @@ var stringOrNumberOrBoolean = c.inMultiple;
 var stringOrNumberOrUndefined = C.inStaticMethod;
 var stringOrNumberOrUndefined = C.inStaticGetter;
 var stringOrNumberOrUndefined = C.inStaticSetter;
+var stringOrNumberOrUndefined = C.inStaticPropertyDeclaration;
+var stringOrNumberOrUndefined = C.inStaticNestedArrowFunction;
diff --git a/tests/cases/fourslash/codeFixAddForgottenThis01.ts b/tests/cases/fourslash/codeFixAddForgottenThis01.ts
index 90d191b6ba5..07f06348212 100644
--- a/tests/cases/fourslash/codeFixAddForgottenThis01.ts
+++ b/tests/cases/fourslash/codeFixAddForgottenThis01.ts
@@ -2,9 +2,11 @@
 
 ////class C {
 ////    foo: number;
-////    constructor() {
-////        [|foo = 10|];
-////    }
+////    constructor() {[|
+////        foo = 10;
+////    |]}
 ////}
 
-verify.rangeAfterCodeFix("this.foo = 10");
\ No newline at end of file
+verify.rangeAfterCodeFix(`
+        this.foo = 10;
+    `, /*includeWhitespace*/ true);
\ No newline at end of file
diff --git a/tests/cases/fourslash/codeFixSuperAfterThis.ts b/tests/cases/fourslash/codeFixSuperAfterThis.ts
index 2bff98ceca0..55b44b07881 100644
--- a/tests/cases/fourslash/codeFixSuperAfterThis.ts
+++ b/tests/cases/fourslash/codeFixSuperAfterThis.ts
@@ -6,8 +6,10 @@
 ////    private a:number;
 ////    constructor() {[|
 ////        this.a = 12;
-////        super();|]
-////    }
+////        super();
+////    |]}
 ////}
-
-verify.rangeAfterCodeFix("super(); this.a = 12;");
\ No newline at end of file
+verify.rangeAfterCodeFix(`
+        super();
+        this.a = 12;
+    `, /*includeWhiteSpace*/ true);
\ No newline at end of file
diff --git a/tests/cases/fourslash/codeFixSuperCall.ts b/tests/cases/fourslash/codeFixSuperCall.ts
index c918e74dc38..f7584050a15 100644
--- a/tests/cases/fourslash/codeFixSuperCall.ts
+++ b/tests/cases/fourslash/codeFixSuperCall.ts
@@ -1,10 +1,11 @@
-/// <reference path='../fourslash.ts' />
+/// <reference path='fourslash.ts' />
 
 ////class Base{
 ////}
 ////class C extends Base{
-////    constructor() {[| |]
-////    }
+////    constructor() {[|
+////    |]}
 ////}
-
-verify.rangeAfterCodeFix('super();');
+verify.rangeAfterCodeFix(`
+        super();
+    `, /*includeWhitespace*/ true);
diff --git a/tests/cases/fourslash/completionEntryForUnionMethod.ts b/tests/cases/fourslash/completionEntryForUnionMethod.ts
index dd0e034cd2d..2dc80e757b2 100644
--- a/tests/cases/fourslash/completionEntryForUnionMethod.ts
+++ b/tests/cases/fourslash/completionEntryForUnionMethod.ts
@@ -5,7 +5,7 @@
 
 goTo.marker();
 verify.quickInfoIs(
-    "(property) map: {\n    <U>(this: [string, string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U, U];\n    <U>(this: [string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U];\n    <U>(this: [string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U];\n    <U>(this: [string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U];\n    <U>(callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): U[];\n} | {\n    <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U];\n    <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U];\n    <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U];\n    <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U];\n    <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[];\n}",
+    "(property) map: {\n    <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U, U];\n    <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U, U];\n    <Z, U>(this: [string, string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U, U];\n    <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U];\n    <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U];\n    <Z, U>(this: [string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U];\n    <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U];\n    <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U];\n    <Z, U>(this: [string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U];\n    <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U];\n    <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U];\n    <Z, U>(this: [string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U];\n    <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): U[];\n    <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): U[];\n    <Z, U>(callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): U[];\n} | {\n    <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U];\n    <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U];\n    <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U];\n    <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U];\n    <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U];\n    <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U];\n    <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U];\n    <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U];\n    <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U];\n    <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U];\n    <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U];\n    <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U];\n    <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[];\n    <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[];\n    <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[];\n}",
     "Calls a defined callback function on each element of an array, and returns an array that contains the results.\nCalls a defined callback function on each element of an array, and returns an array that contains the results.\nCalls a defined callback function on each element of an array, and returns an array that contains the results.\nCalls a defined callback function on each element of an array, and returns an array that contains the results.\nCalls a defined callback function on each element of an array, and returns an array that contains the results.");
 
-verify.completionListContains('map', "(property) map: {\n    <U>(this: [string, string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U, U];\n    <U>(this: [string, string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U, U];\n    <U>(this: [string, string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U, U];\n    <U>(this: [string, string], callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): [U, U];\n    <U>(callbackfn: (value: string, index: number, array: string[]) => U, thisArg?: any): U[];\n} | {\n    <U>(this: [number, number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U, U];\n    <U>(this: [number, number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U, U];\n    <U>(this: [number, number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U, U];\n    <U>(this: [number, number], callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): [U, U];\n    <U>(callbackfn: (value: number, index: number, array: number[]) => U, thisArg?: any): U[];\n}");
+verify.completionListContains('map', "(property) map: {\n    <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U, U];\n    <U>(this: [string, string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U, U];\n    <Z, U>(this: [string, string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U, U];\n    <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U, U];\n    <U>(this: [string, string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U, U];\n    <Z, U>(this: [string, string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U, U];\n    <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U, U];\n    <U>(this: [string, string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U, U];\n    <Z, U>(this: [string, string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U, U];\n    <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): [U, U];\n    <U>(this: [string, string], callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): [U, U];\n    <Z, U>(this: [string, string], callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): [U, U];\n    <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U): U[];\n    <U>(callbackfn: (this: undefined, value: string, index: number, array: string[]) => U, thisArg: undefined): U[];\n    <Z, U>(callbackfn: (this: Z, value: string, index: number, array: string[]) => U, thisArg: Z): U[];\n} | {\n    <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U, U];\n    <U>(this: [number, number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U, U];\n    <Z, U>(this: [number, number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U, U];\n    <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U, U];\n    <U>(this: [number, number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U, U];\n    <Z, U>(this: [number, number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U, U];\n    <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U, U];\n    <U>(this: [number, number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U, U];\n    <Z, U>(this: [number, number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U, U];\n    <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): [U, U];\n    <U>(this: [number, number], callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): [U, U];\n    <Z, U>(this: [number, number], callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): [U, U];\n    <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U): U[];\n    <U>(callbackfn: (this: undefined, value: number, index: number, array: number[]) => U, thisArg: undefined): U[];\n    <Z, U>(callbackfn: (this: Z, value: number, index: number, array: number[]) => U, thisArg: Z): U[];\n}");
diff --git a/tests/cases/fourslash/docCommentTemplateIndentation.ts b/tests/cases/fourslash/docCommentTemplateIndentation.ts
index db7e48dab2e..3f84a73b81f 100644
--- a/tests/cases/fourslash/docCommentTemplateIndentation.ts
+++ b/tests/cases/fourslash/docCommentTemplateIndentation.ts
@@ -1,13 +1,13 @@
 /// <reference path='fourslash.ts' />
 
 // @Filename: indents.ts
-/////*0*/
+////    a   /*2*/
 ////    /*1*/
-////        /*2*/function foo() { }
+/////*0*/        function foo() { }
 
 const noIndentEmptyScaffolding = "/**\r\n * \r\n */";
 const oneIndentEmptyScaffolding = "/**\r\n     * \r\n     */";
-const twoIndentEmptyScaffolding = "/**\r\n         * \r\n         */\r\n        ";
+const twoIndentEmptyScaffolding = "/**\r\n         * \r\n         */";
 const noIndentOffset = 8;
 const oneIndentOffset = noIndentOffset + 4;
 const twoIndentOffset = oneIndentOffset + 4;
@@ -19,4 +19,4 @@ goTo.marker("1");
 verify.DocCommentTemplate(oneIndentEmptyScaffolding, oneIndentOffset);
 
 goTo.marker("2");
-verify.DocCommentTemplate(twoIndentEmptyScaffolding, twoIndentOffset);
\ No newline at end of file
+verify.DocCommentTemplate(twoIndentEmptyScaffolding, twoIndentOffset);
diff --git a/tests/cases/fourslash/importNameCodeFixExistingImport10.ts b/tests/cases/fourslash/importNameCodeFixExistingImport10.ts
index 25246e70123..8a178e72730 100644
--- a/tests/cases/fourslash/importNameCodeFixExistingImport10.ts
+++ b/tests/cases/fourslash/importNameCodeFixExistingImport10.ts
@@ -16,6 +16,6 @@ verify.importFixAtPosition([
 `{
     v1,
     v2,
-f1
+    f1
 }`
 ]);
\ No newline at end of file
diff --git a/tests/cases/fourslash/importNameCodeFixExistingImport11.ts b/tests/cases/fourslash/importNameCodeFixExistingImport11.ts
index 304ffb896df..8822356c13a 100644
--- a/tests/cases/fourslash/importNameCodeFixExistingImport11.ts
+++ b/tests/cases/fourslash/importNameCodeFixExistingImport11.ts
@@ -15,6 +15,7 @@
 verify.importFixAtPosition([
 `{
     v1, v2,
-    v3, f1
+    v3,
+    f1
 }`
 ]);
\ No newline at end of file
diff --git a/tests/cases/fourslash/importNameCodeFixExistingImport9.ts b/tests/cases/fourslash/importNameCodeFixExistingImport9.ts
index 05d17927454..51496abff12 100644
--- a/tests/cases/fourslash/importNameCodeFixExistingImport9.ts
+++ b/tests/cases/fourslash/importNameCodeFixExistingImport9.ts
@@ -11,7 +11,6 @@
 
 verify.importFixAtPosition([
 `{
-    v1,
-f1
+    v1, f1
 }`
 ]);
\ No newline at end of file
diff --git a/tests/cases/fourslash/tsxCompletion14.ts b/tests/cases/fourslash/tsxCompletion14.ts
new file mode 100644
index 00000000000..32fbaef71f3
--- /dev/null
+++ b/tests/cases/fourslash/tsxCompletion14.ts
@@ -0,0 +1,44 @@
+/// <reference path='fourslash.ts' />
+//@module: commonjs
+//@jsx: preserve
+
+//// declare module JSX {
+////     interface Element { }
+////     interface IntrinsicElements {
+////     }
+////     interface ElementAttributesProperty { props; }
+//// }
+
+//@Filename: exporter.tsx
+//// export class Thing { props: { ONE: string; TWO: number } }
+//// export module M {
+////    export declare function SFCComp(props: { Three: number; Four: string }): JSX.Element;
+//// }
+
+//@Filename: file.tsx
+//// import * as Exp from './exporter';
+//// var x1 = <Exp.Thing /*1*/ />;
+//// var x2 = <Exp.M.SFCComp /*2*/ />;
+//// var x3 = <Exp.Thing /*3*/ ></Exp.Thing>;
+//// var x4 = <Exp.M.SFCComp /*4*/ ></Exp.M.SFCComp>;
+
+
+goTo.marker("1");
+verify.completionListCount(2);
+verify.completionListContains('ONE');
+verify.completionListContains('TWO');
+
+goTo.marker("2");
+verify.completionListCount(2);
+verify.completionListContains("Three");
+verify.completionListContains("Four");
+
+goTo.marker("3");
+verify.completionListCount(2);
+verify.completionListContains('ONE');
+verify.completionListContains('TWO');
+
+goTo.marker("4");
+verify.completionListCount(2);
+verify.completionListContains("Three");
+verify.completionListContains("Four");
diff --git a/tests/cases/fourslash/unusedFunctionInNamespace1.ts b/tests/cases/fourslash/unusedFunctionInNamespace1.ts
index 288573608f2..7a63ff13caa 100644
--- a/tests/cases/fourslash/unusedFunctionInNamespace1.ts
+++ b/tests/cases/fourslash/unusedFunctionInNamespace1.ts
@@ -8,5 +8,4 @@
 //// } |]
 
 verify.rangeAfterCodeFix(`namespace greeter {
-    // some legit comments
 }`);
diff --git a/tests/cases/fourslash/unusedVariableInForLoop7FS.ts b/tests/cases/fourslash/unusedVariableInForLoop7FS.ts
index 5aa3251c0b4..7f99863ba46 100644
--- a/tests/cases/fourslash/unusedVariableInForLoop7FS.ts
+++ b/tests/cases/fourslash/unusedVariableInForLoop7FS.ts
@@ -1,12 +1,16 @@
 /// <reference path='fourslash.ts' />
 
 // @noUnusedLocals: true
-//// function f1 () {
-////     for (const elem of ["a", "b", "c"]) {
-////         elem;
-////         [|var x = 20;
-////     }|]
-////}
+////function f1 () [|{
+////    for (const elem of ["a", "b", "c"]) {
+////        elem;
+////        var x = 20;
+////    }
+////}|]
 ////
 
-verify.rangeAfterCodeFix("}");
+verify.rangeAfterCodeFix(`{
+    for (const elem of ["a", "b", "c"]) {
+        elem;
+    }
+}`, /*includeWhiteSpace*/ true);