merge with master

src/compiler/checker.ts

@@ -14246,7 +14246,10 @@ namespace ts {
                 let symbols: Symbol[] = [];
                 let name = symbol.name;
                 forEach(getSymbolLinks(symbol).containingType.types, t => {
-                    symbols.push(getPropertyOfType(t, name));
+                    let symbol = getPropertyOfType(t, name);
+                    if (symbol) {
+                        symbols.push(symbol);
+                    }
                 });
                 return symbols;
             }

src/compiler/commandLineParser.ts

@@ -243,7 +243,8 @@ namespace ts {
                 "node": ModuleResolutionKind.NodeJs,
                 "classic": ModuleResolutionKind.Classic
             },
-            description: Diagnostics.Specifies_module_resolution_strategy_Colon_node_Node_or_classic_TypeScript_pre_1_6
+            description: Diagnostics.Specifies_module_resolution_strategy_Colon_node_Node_js_or_classic_TypeScript_pre_1_6,
+            error: Diagnostics.Argument_for_moduleResolution_option_must_be_node_or_classic,
         },
         {
             name: "noUnusedLabels",
@@ -347,7 +348,7 @@ namespace ts {
                                     options[opt.name] = map[key];
                                 }
                                 else {
-                                    errors.push(createCompilerDiagnostic(opt.error));
+                                    errors.push(createCompilerDiagnostic((<CommandLineOptionOfCustomType>opt).error));
                                 }
                         }
                     }
@@ -460,7 +461,7 @@ namespace ts {
                                     value = optType[key];
                                 }
                                 else {
-                                    errors.push(createCompilerDiagnostic(opt.error));
+                                    errors.push(createCompilerDiagnostic((<CommandLineOptionOfCustomType>opt).error));
                                     value = 0;
                                 }
                             }

src/compiler/diagnosticInformationMap.generated.ts

@@ -565,13 +565,14 @@ namespace ts {
         Specifies_the_end_of_line_sequence_to_be_used_when_emitting_files_Colon_CRLF_dos_or_LF_unix: { code: 6060, category: DiagnosticCategory.Message, key: "Specifies the end of line sequence to be used when emitting files: 'CRLF' (dos) or 'LF' (unix)." },
         NEWLINE: { code: 6061, category: DiagnosticCategory.Message, key: "NEWLINE" },
         Argument_for_newLine_option_must_be_CRLF_or_LF: { code: 6062, category: DiagnosticCategory.Error, key: "Argument for '--newLine' option must be 'CRLF' or 'LF'." },
+        Argument_for_moduleResolution_option_must_be_node_or_classic: { code: 6063, category: DiagnosticCategory.Error, key: "Argument for '--moduleResolution' option must be 'node' or 'classic'." },
         Specify_JSX_code_generation_Colon_preserve_or_react: { code: 6080, category: DiagnosticCategory.Message, key: "Specify JSX code generation: 'preserve' or 'react'" },
         Argument_for_jsx_must_be_preserve_or_react: { code: 6081, category: DiagnosticCategory.Message, key: "Argument for '--jsx' must be 'preserve' or 'react'." },
         Enables_experimental_support_for_ES7_decorators: { code: 6065, category: DiagnosticCategory.Message, key: "Enables experimental support for ES7 decorators." },
         Enables_experimental_support_for_emitting_type_metadata_for_decorators: { code: 6066, category: DiagnosticCategory.Message, key: "Enables experimental support for emitting type metadata for decorators." },
         Option_experimentalAsyncFunctions_cannot_be_specified_when_targeting_ES5_or_lower: { code: 6067, category: DiagnosticCategory.Message, key: "Option 'experimentalAsyncFunctions' cannot be specified when targeting ES5 or lower." },
         Enables_experimental_support_for_ES7_async_functions: { code: 6068, category: DiagnosticCategory.Message, key: "Enables experimental support for ES7 async functions." },
-        Specifies_module_resolution_strategy_Colon_node_Node_or_classic_TypeScript_pre_1_6: { code: 6069, category: DiagnosticCategory.Message, key: "Specifies module resolution strategy: 'node' (Node) or 'classic' (TypeScript pre 1.6) ." },
+        Specifies_module_resolution_strategy_Colon_node_Node_js_or_classic_TypeScript_pre_1_6: { code: 6069, category: DiagnosticCategory.Message, key: "Specifies module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6)." },
         Initializes_a_TypeScript_project_and_creates_a_tsconfig_json_file: { code: 6070, category: DiagnosticCategory.Message, key: "Initializes a TypeScript project and creates a tsconfig.json file." },
         Successfully_created_a_tsconfig_json_file: { code: 6071, category: DiagnosticCategory.Message, key: "Successfully created a tsconfig.json file." },
         Suppress_excess_property_checks_for_object_literals: { code: 6072, category: DiagnosticCategory.Message, key: "Suppress excess property checks for object literals." },

src/compiler/diagnosticMessages.json

@@ -1700,11 +1700,11 @@
     "Merged declaration '{0}' cannot include a default export declaration. Consider adding a separate 'export default {0}' declaration instead.": {
         "category": "Error",
         "code": 2652
-    },
+    },
     "Non-abstract class expression does not implement inherited abstract member '{0}' from class '{1}'.": {
         "category": "Error",
         "code": 2653
-    },
+    },
     "Exported external package typings file cannot contain tripleslash references. Please contact the package author to update the package definition.": {
         "category": "Error",
         "code": 2654
@@ -1712,11 +1712,11 @@
     "Exported external package typings can only be in '.d.ts' files. Please contact the package author to update the package definition.": {
         "category": "Error",
         "code": 2655
-    },
+    },
     "Exported external package typings file '{0}' is not a module. Please contact the package author to update the package definition.": {
         "category": "Error",
         "code": 2656
-    },
+    },
     "Import declaration '{0}' is using private name '{1}'.": {
         "category": "Error",
         "code": 4000
@@ -2250,6 +2250,11 @@
         "category": "Error",
         "code": 6062
     },
+    "Argument for '--moduleResolution' option must be 'node' or 'classic'.": {
+        "category": "Error",
+        "code": 6063
+    },
+
     "Specify JSX code generation: 'preserve' or 'react'": {
         "category": "Message",
         "code": 6080
@@ -2274,7 +2279,7 @@
         "category": "Message",
         "code": 6068
     },
-    "Specifies module resolution strategy: 'node' (Node) or 'classic' (TypeScript pre 1.6) .": {
+    "Specifies module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6).": {
         "category": "Message",
         "code": 6069
     },

src/compiler/emitter.ts

@@ -3220,22 +3220,32 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, Promi
                     }
                 }
 
-                function ensureIdentifier(expr: Expression): Expression {
-                    if (expr.kind !== SyntaxKind.Identifier) {
-                        let identifier = createTempVariable(TempFlags.Auto);
-                        if (!canDefineTempVariablesInPlace) {
-                            recordTempDeclaration(identifier);
-                        }
-                        emitAssignment(identifier, expr);
-                        expr = identifier;
+                /**
+                 * Ensures that there exists a declared identifier whose value holds the given expression.
+                 * This function is useful to ensure that the expression's value can be read from in subsequent expressions.
+                 * Unless 'reuseIdentifierExpressions' is false, 'expr' will be returned if it is just an identifier.
+                 *
+                 * @param expr the expression whose value needs to be bound.
+                 * @param reuseIdentifierExpressions true if identifier expressions can simply be returned;
+                 *                                   false if it is necessary to always emit an identifier.
+                 */
+                function ensureIdentifier(expr: Expression, reuseIdentifierExpressions: boolean): Expression {
+                    if (expr.kind === SyntaxKind.Identifier && reuseIdentifierExpressions) {
+                        return expr;
                     }
-                    return expr;
+
+                    let identifier = createTempVariable(TempFlags.Auto);
+                    if (!canDefineTempVariablesInPlace) {
+                        recordTempDeclaration(identifier);
+                    }
+                    emitAssignment(identifier, expr);
+                    return identifier;
                 }
 
                 function createDefaultValueCheck(value: Expression, defaultValue: Expression): Expression {
                     // The value expression will be evaluated twice, so for anything but a simple identifier
                     // we need to generate a temporary variable
-                    value = ensureIdentifier(value);
+                    value = ensureIdentifier(value, /*reuseIdentifierExpressions*/ true);
                     // Return the expression 'value === void 0 ? defaultValue : value'
                     let equals = <BinaryExpression>createSynthesizedNode(SyntaxKind.BinaryExpression);
                     equals.left = value;
@@ -3286,7 +3296,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, Promi
                     if (properties.length !== 1) {
                         // For anything but a single element destructuring we need to generate a temporary
                         // to ensure value is evaluated exactly once.
-                        value = ensureIdentifier(value);
+                        value = ensureIdentifier(value, /*reuseIdentifierExpressions*/ true);
                     }
                     for (let p of properties) {
                         if (p.kind === SyntaxKind.PropertyAssignment || p.kind === SyntaxKind.ShorthandPropertyAssignment) {
@@ -3301,7 +3311,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, Promi
                     if (elements.length !== 1) {
                         // For anything but a single element destructuring we need to generate a temporary
                         // to ensure value is evaluated exactly once.
-                        value = ensureIdentifier(value);
+                        value = ensureIdentifier(value, /*reuseIdentifierExpressions*/ true);
                     }
                     for (let i = 0; i < elements.length; i++) {
                         let e = elements[i];
@@ -3346,7 +3356,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, Promi
                         if (root.parent.kind !== SyntaxKind.ParenthesizedExpression) {
                             write("(");
                         }
-                        value = ensureIdentifier(value);
+                        value = ensureIdentifier(value, /*reuseIdentifierExpressions*/ true);
                         emitDestructuringAssignment(target, value);
                         write(", ");
                         emit(value);
@@ -3356,7 +3366,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, Promi
                     }
                 }
 
-                function emitBindingElement(target: BindingElement, value: Expression) {
+                function emitBindingElement(target: BindingElement | VariableDeclaration, value: Expression) {
                     if (target.initializer) {
                         // Combine value and initializer
                         value = value ? createDefaultValueCheck(value, target.initializer) : target.initializer;
@@ -3366,14 +3376,19 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, Promi
                         value = createVoidZero();
                     }
                     if (isBindingPattern(target.name)) {
-                        let pattern = <BindingPattern>target.name;
-                        let elements = pattern.elements;
-                        if (elements.length !== 1) {
-                            // For anything but a single element destructuring we need to generate a temporary
-                            // to ensure value is evaluated exactly once.
-                            value = ensureIdentifier(value);
+                        const pattern = <BindingPattern>target.name;
+                        const elements = pattern.elements;
+                        const numElements = elements.length;
+
+                        if (numElements !== 1) {
+                            // For anything other than a single-element destructuring we need to generate a temporary
+                            // to ensure value is evaluated exactly once. Additionally, if we have zero elements
+                            // we need to emit *something* to ensure that in case a 'var' keyword was already emitted,
+                            // so in that case, we'll intentionally create that temporary.
+                            value = ensureIdentifier(value, /*reuseIdentifierExpressions*/ numElements !== 0);
                         }
-                        for (let i = 0; i < elements.length; i++) {
+
+                        for (let i = 0; i < numElements; i++) {
                             let element = elements[i];
                             if (pattern.kind === SyntaxKind.ObjectBindingPattern) {
                                 // Rewrite element to a declaration with an initializer that fetches property
@@ -3385,7 +3400,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, Promi
                                     // Rewrite element to a declaration that accesses array element at index i
                                     emitBindingElement(element, createElementAccessExpression(value, createNumericLiteral(i)));
                                 }
-                                else if (i === elements.length - 1) {
+                                else if (i === numElements - 1) {
                                     emitBindingElement(element, createSliceCall(value, i));
                                 }
                             }

src/compiler/program.ts

@@ -12,7 +12,7 @@ namespace ts {
     
     let emptyArray: any[] = [];
     
-    export const version = "1.6.0";
+    export const version = "1.7.0";
 
     export function findConfigFile(searchPath: string): string {
         let fileName = "tsconfig.json";
@@ -862,8 +862,8 @@ namespace ts {
                         const importedFile = findModuleSourceFile(resolution.resolvedFileName, file.imports[i]);
                         if (importedFile && resolution.isExternalLibraryImport) {
                             if (!isExternalModule(importedFile)) {
-                                let start = getTokenPosOfNode(file.imports[i], file)
-                                fileProcessingDiagnostics.add(createFileDiagnostic(file, start, file.imports[i].end - start, Diagnostics.Exported_external_package_typings_file_0_is_not_a_module_Please_contact_the_package_author_to_update_the_package_definition, importedFile.fileName));
+                                let start = getTokenPosOfNode(file.imports[i], file)
+                                fileProcessingDiagnostics.add(createFileDiagnostic(file, start, file.imports[i].end - start, Diagnostics.Exported_external_package_typings_file_0_is_not_a_module_Please_contact_the_package_author_to_update_the_package_definition, importedFile.fileName));
                             }
                             else if (!fileExtensionIs(importedFile.fileName, ".d.ts")) {
                                 let start = getTokenPosOfNode(file.imports[i], file)

src/compiler/types.ts

@@ -2122,17 +2122,30 @@ namespace ts {
     }
 
     /* @internal */
-    export interface CommandLineOption {
+    export interface CommandLineOptionBase {
         name: string;
         type: string | Map<number>;         // "string", "number", "boolean", or an object literal mapping named values to actual values
         isFilePath?: boolean;               // True if option value is a path or fileName
         shortName?: string;                 // A short mnemonic for convenience - for instance, 'h' can be used in place of 'help'
         description?: DiagnosticMessage;    // The message describing what the command line switch does
         paramType?: DiagnosticMessage;      // The name to be used for a non-boolean option's parameter
-        error?: DiagnosticMessage;          // The error given when the argument does not fit a customized 'type'
         experimental?: boolean;
     }
 
+    /* @internal */
+    export interface CommandLineOptionOfPrimitiveType extends CommandLineOptionBase {
+        type: string;                   // "string" | "number" | "boolean"
+    }
+
+    /* @internal */
+    export interface CommandLineOptionOfCustomType extends CommandLineOptionBase {
+        type: Map<number>;             // an object literal mapping named values to actual values
+        error: DiagnosticMessage;      // The error given when the argument does not fit a customized 'type'
+    }
+
+    /* @internal */
+    export type CommandLineOption = CommandLineOptionOfCustomType | CommandLineOptionOfPrimitiveType;
+
     /* @internal */
     export const enum CharacterCodes {
         nullCharacter = 0,

src/harness/harness.ts

@@ -428,6 +428,7 @@ module Harness {
         args(): string[];
         getExecutingFilePath(): string;
         exit(exitCode?: number): void;
+        readDirectory(path: string, extension?: string, exclude?: string[]): string[];
     }
     export var IO: IO;
     
@@ -464,6 +465,7 @@ module Harness {
             export const directoryExists: typeof IO.directoryExists = fso.FolderExists;
             export const fileExists: typeof IO.fileExists = fso.FileExists;
             export const log: typeof IO.log = global.WScript && global.WScript.StdOut.WriteLine;
+            export const readDirectory: typeof IO.readDirectory = (path, extension, exclude) => ts.sys.readDirectory(path, extension, exclude);
 
             export function createDirectory(path: string) {
                 if (directoryExists(path)) {
@@ -532,6 +534,8 @@ module Harness {
             export const fileExists: typeof IO.fileExists = fs.existsSync;
             export const log: typeof IO.log = s => console.log(s);
 
+            export const readDirectory: typeof IO.readDirectory = (path, extension, exclude) => ts.sys.readDirectory(path, extension, exclude);
+
             export function createDirectory(path: string) {
                 if (!directoryExists(path)) {
                     fs.mkdirSync(path);
@@ -730,6 +734,10 @@ module Harness {
             export function writeFile(path: string, contents: string) {
                 Http.writeToServerSync(serverRoot + path, "WRITE", contents);
             }
+
+            export function readDirectory(path: string, extension?: string, exclude?: string[]) {
+                return listFiles(path).filter(f => !extension || ts.fileExtensionIs(f, extension));
+            }
         }
     }
 

src/harness/instrumenter.ts

@@ -3,11 +3,15 @@ var fs: any = require('fs');
 var path: any = require('path');
 
 function instrumentForRecording(fn: string, tscPath: string) {
-    instrument(tscPath, 'ts.sys = Playback.wrapSystem(ts.sys); ts.sys.startRecord("' + fn + '");', 'ts.sys.endRecord();');
+    instrument(tscPath, `
+ts.sys = Playback.wrapSystem(ts.sys);
+ts.sys.startRecord("${ fn }");`, `ts.sys.endRecord();`);
 }
 
 function instrumentForReplay(logFilename: string, tscPath: string) {
-    instrument(tscPath, 'ts.sys = Playback.wrapSystem(ts.sys); ts.sys.startReplay("' + logFilename + '");');
+    instrument(tscPath, `
+ts.sys = Playback.wrapSystem(ts.sys);
+ts.sys.startReplay("${ logFilename }");`);
 }
 
 function instrument(tscPath: string, prepareCode: string, cleanupCode: string = '') {

src/harness/loggedIO.ts

@@ -59,6 +59,12 @@ interface IOLog {
         path: string;
         result?: string;
     }[];
+    directoriesRead: {
+        path: string,
+        extension: string,
+        exclude: string[],
+        result: string[]
+    }[];
 }
 
 interface PlaybackControl {
@@ -95,12 +101,15 @@ module Playback {
 
     export interface PlaybackIO extends Harness.IO, PlaybackControl { }
 
+    export interface PlaybackSystem extends ts.System, PlaybackControl { }
+
     function createEmptyLog(): IOLog {
         return {
             timestamp: (new Date()).toString(),
             arguments: [],
             currentDirectory: "",
             filesRead: [],
+            directoriesRead: [],
             filesWritten: [],
             filesDeleted: [],
             filesAppended: [],
@@ -114,8 +123,10 @@ module Playback {
         };
     }
 
-    function initWrapper<T>(wrapper: PlaybackControl, underlying: T) {
-        Object.keys(underlying).forEach(prop => {
+    function initWrapper(wrapper: PlaybackSystem, underlying: ts.System): void;
+    function initWrapper(wrapper: PlaybackIO, underlying: Harness.IO): void;
+    function initWrapper(wrapper: PlaybackSystem | PlaybackIO, underlying: ts.System | Harness.IO): void {
+        ts.forEach(Object.keys(underlying), prop => {
             (<any>wrapper)[prop] = (<any>underlying)[prop];
         });
 
@@ -135,6 +146,93 @@ module Playback {
         wrapper.startRecord = (fileNameBase) => {
             recordLogFileNameBase = fileNameBase;
             recordLog = createEmptyLog();
+
+            if (typeof underlying.args !== "function") {
+                recordLog.arguments = <string[]>underlying.args;
+            }
+        };
+
+        wrapper.startReplayFromFile = logFn => {
+            wrapper.startReplayFromString(underlying.readFile(logFn));
+        };
+        wrapper.endRecord = () => {
+            if (recordLog !== undefined) {
+                let i = 0;
+                let fn = () => recordLogFileNameBase + i + ".json";
+                while (underlying.fileExists(fn())) i++;
+                underlying.writeFile(fn(), JSON.stringify(recordLog));
+                recordLog = undefined;
+            }
+        };
+
+        wrapper.fileExists = recordReplay(wrapper.fileExists, underlying)(
+            path => callAndRecord(underlying.fileExists(path), recordLog.fileExists, { path }),
+            memoize(path => {
+                // If we read from the file, it must exist
+                if (findResultByPath(wrapper, replayLog.filesRead, path, null) !== null) {
+                    return true;
+                }
+                else {
+                    return findResultByFields(replayLog.fileExists, { path }, false);
+                }
+            })
+        );
+
+        wrapper.getExecutingFilePath = () => {
+            if (replayLog !== undefined) {
+                return replayLog.executingPath;
+            }
+            else if (recordLog !== undefined) {
+                return recordLog.executingPath = underlying.getExecutingFilePath();
+            }
+            else {
+                return underlying.getExecutingFilePath();
+            }
+        };
+
+        wrapper.getCurrentDirectory = () => {
+            if (replayLog !== undefined) {
+                return replayLog.currentDirectory || "";
+            }
+            else if (recordLog !== undefined) {
+                return recordLog.currentDirectory = underlying.getCurrentDirectory();
+            }
+            else {
+                return underlying.getCurrentDirectory();
+            }
+        };
+
+        wrapper.resolvePath = recordReplay(wrapper.resolvePath, underlying)(
+            path => callAndRecord(underlying.resolvePath(path), recordLog.pathsResolved, { path }),
+            memoize(path => findResultByFields(replayLog.pathsResolved, { path }, !ts.isRootedDiskPath(ts.normalizeSlashes(path)) && replayLog.currentDirectory ? replayLog.currentDirectory + "/" + path : ts.normalizeSlashes(path))));
+
+        wrapper.readFile = recordReplay(wrapper.readFile, underlying)(
+            path => {
+                let result = underlying.readFile(path);
+                let logEntry = { path, codepage: 0, result: { contents: result, codepage: 0 } };
+                recordLog.filesRead.push(logEntry);
+                return result;
+            },
+            memoize(path => findResultByPath(wrapper, replayLog.filesRead, path).contents));
+
+        wrapper.readDirectory = recordReplay(wrapper.readDirectory, underlying)(
+            (path, extension, exclude) => {
+                let result = (<ts.System>underlying).readDirectory(path, extension, exclude);
+                let logEntry = { path, extension, exclude, result };
+                recordLog.directoriesRead.push(logEntry);
+                return result;
+            },
+            (path, extension, exclude) => findResultByPath(wrapper, replayLog.directoriesRead.filter(d => d.extension === extension && ts.arrayIsEqualTo(d.exclude, exclude)), path));
+
+        wrapper.writeFile = recordReplay(wrapper.writeFile, underlying)(
+            (path, contents) => callAndRecord(underlying.writeFile(path, contents), recordLog.filesWritten, { path, contents, bom: false }),
+            (path, contents) => noOpReplay("writeFile"));
+
+        wrapper.exit = (exitCode) => {
+            if (recordLog !== undefined) {
+                wrapper.endRecord();
+            }
+            underlying.exit(exitCode);
         };
     }
 
@@ -143,9 +241,11 @@ module Playback {
             return <any>(function () {
                 if (replayLog !== undefined) {
                     return replay.apply(undefined, arguments);
-                } else if (recordLog !== undefined) {
+                }
+                else if (recordLog !== undefined) {
                     return record.apply(undefined, arguments);
-                } else {
+                }
+                else {
                     return original.apply(underlying, arguments);
                 }
             });
@@ -169,7 +269,8 @@ module Playback {
         if (results.length === 0) {
             if (defaultValue !== undefined) {
                 return defaultValue;
-            } else {
+            }
+            else {
                 throw new Error("No matching result in log array for: " + JSON.stringify(expectedFields));
             }
         }
@@ -177,7 +278,7 @@ module Playback {
     }
 
     function findResultByPath<T>(wrapper: { resolvePath(s: string): string }, logArray: { path: string; result?: T }[], expectedPath: string, defaultValue?: T): T {
-        let normalizedName = ts.normalizeSlashes(expectedPath).toLowerCase();
+        let normalizedName = ts.normalizePath(expectedPath).toLowerCase();
         // Try to find the result through normal fileName
         for (let i = 0; i < logArray.length; i++) {
             if (ts.normalizeSlashes(logArray[i].path).toLowerCase() === normalizedName) {
@@ -193,10 +294,12 @@ module Playback {
                 }
             }
         }
+
         // If we got here, we didn't find a match
         if (defaultValue === undefined) {
             throw new Error("No matching result in log array for path: " + expectedPath);
-        } else {
+        }
+        else {
             return defaultValue;
         }
     }
@@ -214,7 +317,8 @@ module Playback {
         }
         if (pathEquivCache.hasOwnProperty(key)) {
             return pathEquivCache[key];
-        } else {
+        }
+        else {
             return pathEquivCache[key] = check();
         }
     }
@@ -227,93 +331,18 @@ module Playback {
         let wrapper: PlaybackIO = <any>{};
         initWrapper(wrapper, underlying);
 
-        wrapper.startReplayFromFile = logFn => {
-            wrapper.startReplayFromString(underlying.readFile(logFn));
-        };
-        wrapper.endRecord = () => {
-            if (recordLog !== undefined) {
-                let i = 0;
-                let fn = () => recordLogFileNameBase + i + ".json";
-                while (underlying.fileExists(fn())) i++;
-                underlying.writeFile(fn(), JSON.stringify(recordLog));
-                recordLog = undefined;
-            }
-        };
-        
-        wrapper.args = () => {
-            if (replayLog !== undefined) {
-                return replayLog.arguments;
-            } else if (recordLog !== undefined) {
-                recordLog.arguments = underlying.args();
-            }
-            return underlying.args();
-        }
-        
-        wrapper.newLine = () => underlying.newLine();
-        wrapper.useCaseSensitiveFileNames = () => underlying.useCaseSensitiveFileNames();
         wrapper.directoryName = (path): string => { throw new Error("NotSupported"); };
-        wrapper.createDirectory = path => { throw new Error("NotSupported"); };
+        wrapper.createDirectory = (path): void => { throw new Error("NotSupported"); };
         wrapper.directoryExists = (path): boolean => { throw new Error("NotSupported"); };
-        wrapper.deleteFile = path => { throw new Error("NotSupported"); };
+        wrapper.deleteFile = (path): void => { throw new Error("NotSupported"); };
         wrapper.listFiles = (path, filter, options): string[] => { throw new Error("NotSupported"); };
-        wrapper.log = text => underlying.log(text);
-
-        wrapper.fileExists = recordReplay(wrapper.fileExists, underlying)(
-            (path) => callAndRecord(underlying.fileExists(path), recordLog.fileExists, { path: path }),
-            memoize((path) => {
-                // If we read from the file, it must exist
-                if (findResultByPath(wrapper, replayLog.filesRead, path, null) !== null) {
-                    return true;
-                } else {
-                    return findResultByFields(replayLog.fileExists, { path: path }, false);
-                }
-            })
-        );
-
-        wrapper.getExecutingFilePath = () => {
-            if (replayLog !== undefined) {
-                return replayLog.executingPath;
-            } else if (recordLog !== undefined) {
-                return recordLog.executingPath = underlying.getExecutingFilePath();
-            } else {
-                return underlying.getExecutingFilePath();
-            }
-        };
-
-        wrapper.getCurrentDirectory = () => {
-            if (replayLog !== undefined) {
-                return replayLog.currentDirectory || "";
-            } else if (recordLog !== undefined) {
-                return recordLog.currentDirectory = underlying.getCurrentDirectory();
-            } else {
-                return underlying.getCurrentDirectory();
-            }
-        };
-
-        wrapper.resolvePath = recordReplay(wrapper.resolvePath, underlying)(
-            (path) => callAndRecord(underlying.resolvePath(path), recordLog.pathsResolved, { path: path }),
-            memoize((path) => findResultByFields(replayLog.pathsResolved, { path: path }, !ts.isRootedDiskPath(ts.normalizeSlashes(path)) && replayLog.currentDirectory ? replayLog.currentDirectory + "/" + path : ts.normalizeSlashes(path))));
-
-        wrapper.readFile = recordReplay(wrapper.readFile, underlying)(
-            (path) => {
-                let result = underlying.readFile(path);
-                let logEntry = { path: path, codepage: 0, result: { contents: result, codepage: 0 } };
-                recordLog.filesRead.push(logEntry);
-                return result;
-            },
-            memoize((path) => findResultByPath(wrapper, replayLog.filesRead, path).contents));
-
-        wrapper.writeFile = recordReplay(wrapper.writeFile, underlying)(
-            (path, contents) => callAndRecord(underlying.writeFile(path, contents), recordLog.filesWritten, { path: path, contents: contents, bom: false }),
-            (path, contents) => noOpReplay("writeFile"));
-
-        wrapper.exit = (exitCode) => {
-            if (recordLog !== undefined) {
-                wrapper.endRecord();
-            }
-            underlying.exit(exitCode);
-        };
 
         return wrapper;
     }
+
+    export function wrapSystem(underlying: ts.System): PlaybackSystem {
+        let wrapper: PlaybackSystem = <any>{};
+        initWrapper(wrapper, underlying);
+        return wrapper;
+    }
 }

src/harness/rwcRunner.ts

@@ -19,6 +19,11 @@ module RWC {
         }
     }
 
+    function isTsConfigFile(file: { path: string }): boolean {
+        const tsConfigFileName = "tsconfig.json";
+        return file.path.substr(file.path.length - tsConfigFileName.length).toLowerCase() === tsConfigFileName;
+    }
+
     export function runRWCTest(jsonPath: string) {
         describe("Testing a RWC project: " + jsonPath, () => {
             let inputFiles: { unitName: string; content: string; }[] = [];
@@ -67,10 +72,21 @@ module RWC {
                 runWithIOLog(ioLog, oldIO => {
                     harnessCompiler.reset();
 
+                    let fileNames = opts.fileNames;
+
+                    let tsconfigFile = ts.forEach(ioLog.filesRead, f => isTsConfigFile(f) ? f : undefined);
+                    if (tsconfigFile) {
+                        let tsconfigFileContents = getHarnessCompilerInputUnit(tsconfigFile.path);
+                        let parsedTsconfigFileContents = ts.parseConfigFileText(tsconfigFile.path, tsconfigFileContents.content);
+                        let configParseResult = ts.parseConfigFile(parsedTsconfigFileContents.config, Harness.IO, ts.getDirectoryPath(tsconfigFile.path));
+                        fileNames = configParseResult.fileNames;
+                        opts.options = ts.extend(opts.options, configParseResult.options);
+                    }
+
                     // Load the files
-                    ts.forEach(opts.fileNames, fileName => {
+                    for (let fileName of fileNames) {
                         inputFiles.push(getHarnessCompilerInputUnit(fileName));
-                    });
+                    }
 
                     // Add files to compilation
                     let isInInputList = (resolvedPath: string) => (inputFile: { unitName: string; content: string; }) => inputFile.unitName === resolvedPath;
@@ -79,6 +95,10 @@ module RWC {
                         const resolvedPath = ts.normalizeSlashes(Harness.IO.resolvePath(fileRead.path));
                         let inInputList = ts.forEach(inputFiles, isInInputList(resolvedPath));
 
+                        if (isTsConfigFile(fileRead)) {
+                            continue;
+                        }
+
                         if (!Harness.isLibraryFile(fileRead.path)) {
                             if (inInputList) {
                                 continue;

src/services/services.ts

@@ -2152,6 +2152,7 @@ namespace ts {
             //
             //    export * from "mod"
             //    export {a as b} from "mod"
+            //    export import i = require("mod")
 
             while (token !== SyntaxKind.EndOfFileToken) {
                 if (token === SyntaxKind.DeclareKeyword) {
@@ -2276,6 +2277,25 @@ namespace ts {
                             }
                         }
                     }
+                    else if (token === SyntaxKind.ImportKeyword) {
+                        token = scanner.scan();
+                        if (token === SyntaxKind.Identifier || isKeyword(token)) {
+                            token = scanner.scan();
+                            if (token === SyntaxKind.EqualsToken) {
+                                token = scanner.scan();
+                                if (token === SyntaxKind.RequireKeyword) {
+                                    token = scanner.scan();
+                                    if (token === SyntaxKind.OpenParenToken) {
+                                        token = scanner.scan();
+                                        if (token === SyntaxKind.StringLiteral) {
+                                            //  export import i = require("mod");
+                                            recordModuleName();
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
                 }
                 token = scanner.scan();
             }