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diff --git a/‎src/compiler/diagnosticMessages.json
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+9Lines changed: 9 additions & 0 deletions b/‎src/compiler/diagnosticMessages.json
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+9Lines changed: 9 additions & 0 deletions
diff --git a/‎src/compiler/emitter.ts
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+20-8Lines changed: 20 additions & 8 deletions b/‎src/compiler/emitter.ts
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+20-8Lines changed: 20 additions & 8 deletions
diff --git a/‎src/compiler/factory.ts
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+2-2Lines changed: 2 additions & 2 deletions b/‎src/compiler/factory.ts
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+2-2Lines changed: 2 additions & 2 deletions
diff --git a/‎src/compiler/types.ts
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+3-1Lines changed: 3 additions & 1 deletion b/‎src/compiler/types.ts
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+3-1Lines changed: 3 additions & 1 deletion
diff --git a/‎src/compiler/visitor.ts
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+2-1Lines changed: 2 additions & 1 deletion b/‎src/compiler/visitor.ts
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+2-1Lines changed: 2 additions & 1 deletion
diff --git a/‎src/harness/fourslash.ts
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+68-1Lines changed: 68 additions & 1 deletion b/‎src/harness/fourslash.ts
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+68-1Lines changed: 68 additions & 1 deletion
diff --git a/‎src/harness/harness.ts
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+1-1Lines changed: 1 addition & 1 deletion b/‎src/harness/harness.ts
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+1-1Lines changed: 1 addition & 1 deletion
diff --git a/‎src/harness/harnessLanguageService.ts
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+9Lines changed: 9 additions & 0 deletions b/‎src/harness/harnessLanguageService.ts
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+9Lines changed: 9 additions & 0 deletions
diff --git a/‎src/harness/unittests/tsserverProjectSystem.ts
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+9-4Lines changed: 9 additions & 4 deletions b/‎src/harness/unittests/tsserverProjectSystem.ts
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+9-4Lines changed: 9 additions & 4 deletions
diff --git a/‎src/server/client.ts
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+40Lines changed: 40 additions & 0 deletions b/‎src/server/client.ts
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@@ -3584,6 +3584,15 @@
         "code": 90022
     },
 
+    "Convert function to an ES2015 class": {
+        "category": "Message",
+        "code": 95001
+    },
+    "Convert function '{0}' to class": {
+        "category": "Message",
+        "code": 95002
+    },
+
     "Octal literal types must use ES2015 syntax. Use the syntax '{0}'.": {
         "category": "Error",
         "code": 8017
 
@@ -200,7 +200,9 @@ namespace ts {
             onSetSourceFile,
             substituteNode,
             onBeforeEmitNodeArray,
-            onAfterEmitNodeArray
+            onAfterEmitNodeArray,
+            onBeforeEmitToken,
+            onAfterEmitToken
         } = handlers;
 
         const newLine = getNewLineCharacter(printerOptions);
@@ -406,7 +408,7 @@ namespace ts {
             // Strict mode reserved words
             // Contextual keywords
             if (isKeyword(kind)) {
-                writeTokenText(kind);
+                writeTokenNode(node);
                 return;
             }
 
@@ -645,7 +647,7 @@ namespace ts {
             }
 
             if (isToken(node)) {
-                writeTokenText(kind);
+                writeTokenNode(node);
                 return;
             }
         }
@@ -672,7 +674,7 @@ namespace ts {
                 case SyntaxKind.SuperKeyword:
                 case SyntaxKind.TrueKeyword:
                 case SyntaxKind.ThisKeyword:
-                    writeTokenText(kind);
+                    writeTokenNode(node);
                     return;
 
                 // Expressions
@@ -1260,7 +1262,7 @@ namespace ts {
             const operand = node.operand;
             return operand.kind === SyntaxKind.PrefixUnaryExpression
                 && ((node.operator === SyntaxKind.PlusToken && ((<PrefixUnaryExpression>operand).operator === SyntaxKind.PlusToken || (<PrefixUnaryExpression>operand).operator === SyntaxKind.PlusPlusToken))
-                || (node.operator === SyntaxKind.MinusToken && ((<PrefixUnaryExpression>operand).operator === SyntaxKind.MinusToken || (<PrefixUnaryExpression>operand).operator === SyntaxKind.MinusMinusToken)));
+                    || (node.operator === SyntaxKind.MinusToken && ((<PrefixUnaryExpression>operand).operator === SyntaxKind.MinusToken || (<PrefixUnaryExpression>operand).operator === SyntaxKind.MinusMinusToken)));
         }
 
         function emitPostfixUnaryExpression(node: PostfixUnaryExpression) {
@@ -1275,7 +1277,7 @@ namespace ts {
 
             emitExpression(node.left);
             increaseIndentIf(indentBeforeOperator, isCommaOperator ? " " : undefined);
-            writeTokenText(node.operatorToken.kind);
+            writeTokenNode(node.operatorToken);
             increaseIndentIf(indentAfterOperator, " ");
             emitExpression(node.right);
             decreaseIndentIf(indentBeforeOperator, indentAfterOperator);
@@ -2455,6 +2457,16 @@ namespace ts {
                 : writeTokenText(token, pos);
         }
 
+        function writeTokenNode(node: Node) {
+            if (onBeforeEmitToken) {
+                onBeforeEmitToken(node);
+            }
+            writeTokenText(node.kind);
+            if (onAfterEmitToken) {
+                onAfterEmitToken(node);
+            }
+        }
+
         function writeTokenText(token: SyntaxKind, pos?: number) {
             const tokenString = tokenToString(token);
             write(tokenString);
@@ -2928,9 +2940,9 @@ namespace ts {
 
     // Flags enum to track count of temp variables and a few dedicated names
     const enum TempFlags {
-        Auto      = 0x00000000,  // No preferred name
+        Auto = 0x00000000,  // No preferred name
         CountMask = 0x0FFFFFFF,  // Temp variable counter
-        _i        = 0x10000000,  // Use/preference flag for '_i'
+        _i = 0x10000000,  // Use/preference flag for '_i'
     }
 
     const enum ListFormat {
 
@@ -984,10 +984,10 @@ namespace ts {
         return node;
     }
 
-    export function updateBinary(node: BinaryExpression, left: Expression, right: Expression) {
+    export function updateBinary(node: BinaryExpression, left: Expression, right: Expression, operator?: BinaryOperator | BinaryOperatorToken) {
         return node.left !== left
             || node.right !== right
-            ? updateNode(createBinary(left, node.operatorToken, right), node)
+            ? updateNode(createBinary(left, operator || node.operatorToken, right), node)
             : node;
     }
 
 
@@ -3415,7 +3415,7 @@ namespace ts {
     export enum DiagnosticCategory {
         Warning,
         Error,
-        Message,
+        Message
     }
 
     export enum ModuleResolutionKind {
@@ -4273,6 +4273,8 @@ namespace ts {
         /*@internal*/ onSetSourceFile?: (node: SourceFile) => void;
         /*@internal*/ onBeforeEmitNodeArray?: (nodes: NodeArray<any>) => void;
         /*@internal*/ onAfterEmitNodeArray?: (nodes: NodeArray<any>) => void;
+        /*@internal*/ onBeforeEmitToken?: (node: Node) => void;
+        /*@internal*/ onAfterEmitToken?: (node: Node) => void;
     }
 
     export interface PrinterOptions {
 
@@ -516,7 +516,8 @@ namespace ts {
             case SyntaxKind.BinaryExpression:
                 return updateBinary(<BinaryExpression>node,
                     visitNode((<BinaryExpression>node).left, visitor, isExpression),
-                    visitNode((<BinaryExpression>node).right, visitor, isExpression));
+                    visitNode((<BinaryExpression>node).right, visitor, isExpression),
+                    visitNode((<BinaryExpression>node).operatorToken, visitor, isToken));
 
             case SyntaxKind.ConditionalExpression:
                 return updateConditional(<ConditionalExpression>node,
 
@@ -2354,7 +2354,8 @@ namespace FourSlash {
         private applyCodeAction(fileName: string, actions: ts.CodeAction[], index?: number): void {
             if (index === undefined) {
                 if (!(actions && actions.length === 1)) {
-                    this.raiseError(`Should find exactly one codefix, but ${actions ? actions.length : "none"} found.`);
+                    const actionText = (actions && actions.length) ? JSON.stringify(actions) : "none";
+                    this.raiseError(`Should find exactly one codefix, but found ${actionText}`);
                 }
                 index = 0;
             }
@@ -2708,6 +2709,60 @@ namespace FourSlash {
             }
         }
 
+        public verifyApplicableRefactorAvailableAtMarker(negative: boolean, markerName: string) {
+            const marker = this.getMarkerByName(markerName);
+            const applicableRefactors = this.languageService.getApplicableRefactors(this.activeFile.fileName, marker.position);
+            const isAvailable = applicableRefactors && applicableRefactors.length > 0;
+            if (negative && isAvailable) {
+                this.raiseError(`verifyApplicableRefactorAvailableAtMarker failed - expected no refactor at marker ${markerName} but found some.`);
+            }
+            if (!negative && !isAvailable) {
+                this.raiseError(`verifyApplicableRefactorAvailableAtMarker failed - expected a refactor at marker ${markerName} but found none.`);
+            }
+        }
+
+        public verifyApplicableRefactorAvailableForRange(negative: boolean) {
+            const ranges = this.getRanges();
+            if (!(ranges && ranges.length === 1)) {
+                throw new Error("Exactly one refactor range is allowed per test.");
+            }
+
+            const applicableRefactors = this.languageService.getApplicableRefactors(this.activeFile.fileName, { pos: ranges[0].start, end: ranges[0].end });
+            const isAvailable = applicableRefactors && applicableRefactors.length > 0;
+            if (negative && isAvailable) {
+                this.raiseError(`verifyApplicableRefactorAvailableForRange failed - expected no refactor but found some.`);
+            }
+            if (!negative && !isAvailable) {
+                this.raiseError(`verifyApplicableRefactorAvailableForRange failed - expected a refactor but found none.`);
+            }
+        }
+
+        public verifyFileAfterApplyingRefactorAtMarker(
+            markerName: string,
+            expectedContent: string,
+            refactorNameToApply: string,
+            formattingOptions?: ts.FormatCodeSettings) {
+
+            formattingOptions = formattingOptions || this.formatCodeSettings;
+            const markerPos = this.getMarkerByName(markerName).position;
+
+            const applicableRefactors = this.languageService.getApplicableRefactors(this.activeFile.fileName, markerPos);
+            const applicableRefactorToApply = ts.find(applicableRefactors, refactor => refactor.name === refactorNameToApply);
+
+            if (!applicableRefactorToApply) {
+                this.raiseError(`The expected refactor: ${refactorNameToApply} is not available at the marker location.`);
+            }
+
+            const codeActions = this.languageService.getRefactorCodeActions(this.activeFile.fileName, formattingOptions, markerPos, refactorNameToApply);
+
+            this.applyCodeAction(this.activeFile.fileName, codeActions);
+            const actualContent = this.getFileContent(this.activeFile.fileName);
+
+            if (this.normalizeNewlines(actualContent) !== this.normalizeNewlines(expectedContent)) {
+                this.raiseError(`verifyFileAfterApplyingRefactors failed: expected:\n${expectedContent}\nactual:\n${actualContent}`);
+            }
+        }
+
         public printAvailableCodeFixes() {
             const codeFixes = this.getCodeFixActions(this.activeFile.fileName);
             Harness.IO.log(stringify(codeFixes));
@@ -3521,6 +3576,14 @@ namespace FourSlashInterface {
         public codeFixAvailable() {
             this.state.verifyCodeFixAvailable(this.negative);
         }
+
+        public applicableRefactorAvailableAtMarker(markerName: string) {
+            this.state.verifyApplicableRefactorAvailableAtMarker(this.negative, markerName);
+        }
+
+        public applicableRefactorAvailableForRange() {
+            this.state.verifyApplicableRefactorAvailableForRange(this.negative);
+        }
     }
 
     export class Verify extends VerifyNegatable {
@@ -3735,6 +3798,10 @@ namespace FourSlashInterface {
             this.state.verifyRangeAfterCodeFix(expectedText, includeWhiteSpace, errorCode, index);
         }
 
+        public fileAfterApplyingRefactorAtMarker(markerName: string, expectedContent: string, refactorNameToApply: string, formattingOptions?: ts.FormatCodeSettings): void {
+            this.state.verifyFileAfterApplyingRefactorAtMarker(markerName, expectedContent, refactorNameToApply, formattingOptions);
+        }
+
         public importFixAtPosition(expectedTextArray: string[], errorCode?: number): void {
             this.state.verifyImportFixAtPosition(expectedTextArray, errorCode);
         }
 
@@ -1983,5 +1983,5 @@ namespace Harness {
         return { unitName: libFile, content: io.readFile(libFile) };
     }
 
-    if (Error) (<any>Error).stackTraceLimit = 1;
+    if (Error) (<any>Error).stackTraceLimit = 100;
 }
@@ -489,6 +489,15 @@ namespace Harness.LanguageService {
         getCodeFixesAtPosition(): ts.CodeAction[] {
             throw new Error("Not supported on the shim.");
         }
+        getCodeFixDiagnostics(): ts.Diagnostic[] {
+            throw new Error("Not supported on the shim.");
+        }
+        getRefactorCodeActions(): ts.CodeAction[] {
+            throw new Error("Not supported on the shim.");
+        }
+        getApplicableRefactors(): ts.ApplicableRefactorInfo[] {
+            throw new Error("Not supported on the shim.");
+        }
         getEmitOutput(fileName: string): ts.EmitOutput {
             return unwrapJSONCallResult(this.shim.getEmitOutput(fileName));
         }
 
@@ -337,6 +337,7 @@ namespace ts.projectSystem {
             this.map[timeoutId] = cb.bind(/*this*/ undefined, ...args);
             return timeoutId;
         }
+
         unregister(id: any) {
             if (typeof id === "number") {
                 delete this.map[id];
@@ -352,10 +353,13 @@ namespace ts.projectSystem {
         }
 
         invoke() {
+            // Note: invoking a callback may result in new callbacks been queued,
+            // so do not clear the entire callback list regardless. Only remove the
+            // ones we have invoked.
             for (const key in this.map) {
                 this.map[key]();
+                delete this.map[key];
             }
-            this.map = [];
         }
     }
 
@@ -3743,7 +3747,7 @@ namespace ts.projectSystem {
 
                 // run first step
                 host.runQueuedTimeoutCallbacks();
-                assert.equal(host.getOutput().length, 1, "expect 1 messages");
+                assert.equal(host.getOutput().length, 1, "expect 1 message");
                 const e1 = <protocol.Event>getMessage(0);
                 assert.equal(e1.event, "syntaxDiag");
                 host.clearOutput();
@@ -3765,11 +3769,12 @@ namespace ts.projectSystem {
 
                 // run first step
                 host.runQueuedTimeoutCallbacks();
-                assert.equal(host.getOutput().length, 1, "expect 1 messages");
+                assert.equal(host.getOutput().length, 1, "expect 1 message");
                 const e1 = <protocol.Event>getMessage(0);
                 assert.equal(e1.event, "syntaxDiag");
                 host.clearOutput();
 
+                // the semanticDiag message
                 host.runQueuedImmediateCallbacks();
                 assert.equal(host.getOutput().length, 2, "expect 2 messages");
                 const e2 = <protocol.Event>getMessage(0);
@@ -3787,7 +3792,7 @@ namespace ts.projectSystem {
                 assert.equal(host.getOutput().length, 0, "expect 0 messages");
                 // run first step
                 host.runQueuedTimeoutCallbacks();
-                assert.equal(host.getOutput().length, 1, "expect 1 messages");
+                assert.equal(host.getOutput().length, 1, "expect 1 message");
                 const e1 = <protocol.Event>getMessage(0);
                 assert.equal(e1.event, "syntaxDiag");
                 host.clearOutput();
 
@@ -695,6 +695,46 @@ namespace ts.server {
             return response.body.map(entry => this.convertCodeActions(entry, fileName));
         }
 
+        private createFileLocationOrRangeRequestArgs(positionOrRange: number | TextRange, fileName: string): protocol.FileLocationOrRangeRequestArgs {
+            if (typeof positionOrRange === "number") {
+                const { line, offset } = this.positionToOneBasedLineOffset(fileName, positionOrRange);
+                return <protocol.FileLocationRequestArgs>{ file: fileName, line, offset };
+            }
+            const { line: startLine, offset: startOffset } = this.positionToOneBasedLineOffset(fileName, positionOrRange.pos);
+            const { line: endLine, offset: endOffset } = this.positionToOneBasedLineOffset(fileName, positionOrRange.end);
+            return <protocol.FileRangeRequestArgs>{
+                file: fileName,
+                startLine,
+                startOffset,
+                endLine,
+                endOffset
+            };
+        }
+
+        getApplicableRefactors(fileName: string, positionOrRange: number | TextRange): ApplicableRefactorInfo[] {
+            const args = this.createFileLocationOrRangeRequestArgs(positionOrRange, fileName);
+
+            const request = this.processRequest<protocol.GetApplicableRefactorsRequest>(CommandNames.GetApplicableRefactors, args);
+            const response = this.processResponse<protocol.GetApplicableRefactorsResponse>(request);
+            return response.body;
+        }
+
+        getRefactorCodeActions(
+            fileName: string,
+            _formatOptions: FormatCodeSettings,
+            positionOrRange: number | TextRange,
+            refactorName: string) {
+
+            const args = this.createFileLocationOrRangeRequestArgs(positionOrRange, fileName) as protocol.GetRefactorCodeActionsRequestArgs;
+            args.refactorName = refactorName;
+
+            const request = this.processRequest<protocol.GetRefactorCodeActionsRequest>(CommandNames.GetRefactorCodeActions, args);
+            const response = this.processResponse<protocol.GetRefactorCodeActionsResponse>(request);
+            const codeActions = response.body.actions;
+
+            return map(codeActions, codeAction => this.convertCodeActions(codeAction, fileName));
+        }
+
         convertCodeActions(entry: protocol.CodeAction, fileName: string): CodeAction {
             return {
                 description: entry.description,
Original file line number	Diff line number	Diff line change
`@@ -984,10 +984,10 @@ namespace ts {`
`984`	`984`	`return node;`
`985`	`985`	`}`
`986`	`986`
`987`		`- export function updateBinary(node: BinaryExpression, left: Expression, right: Expression) {`
	`987`	`+ export function updateBinary(node: BinaryExpression, left: Expression, right: Expression, operator?: BinaryOperator \| BinaryOperatorToken) {`
`988`	`988`	`return node.left !== left`
`989`	`989`	`\|\| node.right !== right`
`990`		`- ? updateNode(createBinary(left, node.operatorToken, right), node)`
	`990`	`+ ? updateNode(createBinary(left, operator \|\| node.operatorToken, right), node)`
`991`	`991`	`: node;`
`992`	`992`	`}`
`993`	`993`
Original file line number	Diff line number	Diff line change
`@@ -1983,5 +1983,5 @@ namespace Harness {`
`1983`	`1983`	`return { unitName: libFile, content: io.readFile(libFile) };`
`1984`	`1984`	`}`
`1985`	`1985`
`1986`		`- if (Error) (<any>Error).stackTraceLimit = 1;`
	`1986`	`+ if (Error) (<any>Error).stackTraceLimit = 100;`
`1987`	`1987`	`}`