diff --git a/bin/lib.core.es6.d.ts b/bin/lib.core.es6.d.ts
index 3344cf3197d..902962cae51 100644
--- a/bin/lib.core.es6.d.ts
+++ b/bin/lib.core.es6.d.ts
@@ -1237,11 +1237,41 @@ interface SymbolConstructor {
     isConcatSpreadable: symbol;
 
     /** 
-      * A method that returns the default iterator for an object.Called by the semantics of the 
+      * A method that returns the default iterator for an object. Called by the semantics of the 
       * for-of statement.
       */
     iterator: symbol;
 
+    /**
+      * A regular expression method that matches the regular expression against a string. Called 
+      * by the String.prototype.match method. 
+      */
+    match: symbol;
+
+    /** 
+      * A regular expression method that replaces matched substrings of a string. Called by the 
+      * String.prototype.replace method.
+      */
+    replace: symbol;
+
+    /**
+      * A regular expression method that returns the index within a string that matches the 
+      * regular expression. Called by the String.prototype.search method.
+      */
+    search: symbol;
+
+    /** 
+      * A function valued property that is the constructor function that is used to create 
+      * derived objects.
+      */
+    species: symbol;
+
+    /**
+      * A regular expression method that splits a string at the indices that match the regular 
+      * expression. Called by the String.prototype.split method.
+      */
+    split: symbol;
+
     /** 
       * A method that converts an object to a corresponding primitive value.Called by the ToPrimitive
       * abstract operation.
@@ -4728,6 +4758,16 @@ declare module Reflect {
     function setPrototypeOf(target: any, proto: any): boolean;
 }
 
+interface PromiseLike<T> {
+    /**
+    * Attaches callbacks for the resolution and/or rejection of the Promise.
+    * @param onfulfilled The callback to execute when the Promise is resolved.
+    * @param onrejected The callback to execute when the Promise is rejected.
+    * @returns A Promise for the completion of which ever callback is executed.
+    */
+    then<TResult>(onfulfilled?: (value: T) => TResult | PromiseLike<TResult>, onrejected?: (reason: any) => TResult | PromiseLike<TResult>): PromiseLike<TResult>;
+}
+
 /**
  * Represents the completion of an asynchronous operation
  */
@@ -4738,14 +4778,16 @@ interface Promise<T> {
     * @param onrejected The callback to execute when the Promise is rejected.
     * @returns A Promise for the completion of which ever callback is executed.
     */
-    then<TResult>(onfulfilled?: (value: T) => TResult | Promise<TResult>, onrejected?: (reason: any) => TResult | Promise<TResult>): Promise<TResult>;
+    then<TResult>(onfulfilled?: (value: T) => TResult | PromiseLike<TResult>, onrejected?: (reason: any) => TResult | PromiseLike<TResult>): Promise<TResult>;
 
     /**
      * Attaches a callback for only the rejection of the Promise.
      * @param onrejected The callback to execute when the Promise is rejected.
      * @returns A Promise for the completion of the callback.
      */
-    catch(onrejected?: (reason: any) => T | Promise<T>): Promise<T>;
+    catch(onrejected?: (reason: any) => T | PromiseLike<T>): Promise<T>;
+
+    [Symbol.toStringTag]: string;
 }
 
 interface PromiseConstructor {
@@ -4756,13 +4798,11 @@ interface PromiseConstructor {
 
     /**
      * Creates a new Promise.
-     * @param init A callback used to initialize the promise. This callback is passed two arguments: 
+     * @param executor A callback used to initialize the promise. This callback is passed two arguments: 
      * a resolve callback used resolve the promise with a value or the result of another promise, 
      * and a reject callback used to reject the promise with a provided reason or error.
      */
-    new <T>(init: (resolve: (value?: T | Promise<T>) => void, reject: (reason?: any) => void) => void): Promise<T>;
-
-    <T>(init: (resolve: (value?: T | Promise<T>) => void, reject: (reason?: any) => void) => void): Promise<T>;
+    new <T>(executor: (resolve: (value?: T | PromiseLike<T>) => void, reject: (reason?: any) => void) => void): Promise<T>;
 
     /**
      * Creates a Promise that is resolved with an array of results when all of the provided Promises 
@@ -4770,15 +4810,7 @@ interface PromiseConstructor {
      * @param values An array of Promises.
      * @returns A new Promise.
      */
-    all<T>(values: (T | Promise<T>)[]): Promise<T[]>;
-
-    /**
-     * Creates a Promise that is resolved with an array of results when all of the provided Promises
-     * resolve, or rejected when any Promise is rejected.
-     * @param values An array of values.
-     * @returns A new Promise.
-     */
-    all(values: Promise<void>[]): Promise<void>;
+    all<T>(values: Iterable<T | PromiseLike<T>>): Promise<T[]>;
 
     /**
      * Creates a Promise that is resolved or rejected when any of the provided Promises are resolved 
@@ -4786,7 +4818,7 @@ interface PromiseConstructor {
      * @param values An array of Promises.
      * @returns A new Promise.
      */
-    race<T>(values: (T | Promise<T>)[]): Promise<T>;
+    race<T>(values: Iterable<T | PromiseLike<T>>): Promise<T>;
 
     /**
      * Creates a new rejected promise for the provided reason.
@@ -4807,13 +4839,15 @@ interface PromiseConstructor {
       * @param value A promise.
       * @returns A promise whose internal state matches the provided promise.
       */
-    resolve<T>(value: T | Promise<T>): Promise<T>;
+    resolve<T>(value: T | PromiseLike<T>): Promise<T>;
 
     /**
      * Creates a new resolved promise .
      * @returns A resolved promise.
      */
     resolve(): Promise<void>;
+
+    [Symbol.species]: Function;
 }
 
 declare var Promise: PromiseConstructor;
diff --git a/bin/lib.es6.d.ts b/bin/lib.es6.d.ts
index 8e7793c8dbd..8266e4264c1 100644
--- a/bin/lib.es6.d.ts
+++ b/bin/lib.es6.d.ts
@@ -1237,11 +1237,41 @@ interface SymbolConstructor {
     isConcatSpreadable: symbol;
 
     /** 
-      * A method that returns the default iterator for an object.Called by the semantics of the 
+      * A method that returns the default iterator for an object. Called by the semantics of the 
       * for-of statement.
       */
     iterator: symbol;
 
+    /**
+      * A regular expression method that matches the regular expression against a string. Called 
+      * by the String.prototype.match method. 
+      */
+    match: symbol;
+
+    /** 
+      * A regular expression method that replaces matched substrings of a string. Called by the 
+      * String.prototype.replace method.
+      */
+    replace: symbol;
+
+    /**
+      * A regular expression method that returns the index within a string that matches the 
+      * regular expression. Called by the String.prototype.search method.
+      */
+    search: symbol;
+
+    /** 
+      * A function valued property that is the constructor function that is used to create 
+      * derived objects.
+      */
+    species: symbol;
+
+    /**
+      * A regular expression method that splits a string at the indices that match the regular 
+      * expression. Called by the String.prototype.split method.
+      */
+    split: symbol;
+
     /** 
       * A method that converts an object to a corresponding primitive value.Called by the ToPrimitive
       * abstract operation.
@@ -4728,6 +4758,16 @@ declare module Reflect {
     function setPrototypeOf(target: any, proto: any): boolean;
 }
 
+interface PromiseLike<T> {
+    /**
+    * Attaches callbacks for the resolution and/or rejection of the Promise.
+    * @param onfulfilled The callback to execute when the Promise is resolved.
+    * @param onrejected The callback to execute when the Promise is rejected.
+    * @returns A Promise for the completion of which ever callback is executed.
+    */
+    then<TResult>(onfulfilled?: (value: T) => TResult | PromiseLike<TResult>, onrejected?: (reason: any) => TResult | PromiseLike<TResult>): PromiseLike<TResult>;
+}
+
 /**
  * Represents the completion of an asynchronous operation
  */
@@ -4738,14 +4778,16 @@ interface Promise<T> {
     * @param onrejected The callback to execute when the Promise is rejected.
     * @returns A Promise for the completion of which ever callback is executed.
     */
-    then<TResult>(onfulfilled?: (value: T) => TResult | Promise<TResult>, onrejected?: (reason: any) => TResult | Promise<TResult>): Promise<TResult>;
+    then<TResult>(onfulfilled?: (value: T) => TResult | PromiseLike<TResult>, onrejected?: (reason: any) => TResult | PromiseLike<TResult>): Promise<TResult>;
 
     /**
      * Attaches a callback for only the rejection of the Promise.
      * @param onrejected The callback to execute when the Promise is rejected.
      * @returns A Promise for the completion of the callback.
      */
-    catch(onrejected?: (reason: any) => T | Promise<T>): Promise<T>;
+    catch(onrejected?: (reason: any) => T | PromiseLike<T>): Promise<T>;
+
+    [Symbol.toStringTag]: string;
 }
 
 interface PromiseConstructor {
@@ -4756,13 +4798,11 @@ interface PromiseConstructor {
 
     /**
      * Creates a new Promise.
-     * @param init A callback used to initialize the promise. This callback is passed two arguments: 
+     * @param executor A callback used to initialize the promise. This callback is passed two arguments: 
      * a resolve callback used resolve the promise with a value or the result of another promise, 
      * and a reject callback used to reject the promise with a provided reason or error.
      */
-    new <T>(init: (resolve: (value?: T | Promise<T>) => void, reject: (reason?: any) => void) => void): Promise<T>;
-
-    <T>(init: (resolve: (value?: T | Promise<T>) => void, reject: (reason?: any) => void) => void): Promise<T>;
+    new <T>(executor: (resolve: (value?: T | PromiseLike<T>) => void, reject: (reason?: any) => void) => void): Promise<T>;
 
     /**
      * Creates a Promise that is resolved with an array of results when all of the provided Promises 
@@ -4770,15 +4810,7 @@ interface PromiseConstructor {
      * @param values An array of Promises.
      * @returns A new Promise.
      */
-    all<T>(values: (T | Promise<T>)[]): Promise<T[]>;
-
-    /**
-     * Creates a Promise that is resolved with an array of results when all of the provided Promises
-     * resolve, or rejected when any Promise is rejected.
-     * @param values An array of values.
-     * @returns A new Promise.
-     */
-    all(values: Promise<void>[]): Promise<void>;
+    all<T>(values: Iterable<T | PromiseLike<T>>): Promise<T[]>;
 
     /**
      * Creates a Promise that is resolved or rejected when any of the provided Promises are resolved 
@@ -4786,7 +4818,7 @@ interface PromiseConstructor {
      * @param values An array of Promises.
      * @returns A new Promise.
      */
-    race<T>(values: (T | Promise<T>)[]): Promise<T>;
+    race<T>(values: Iterable<T | PromiseLike<T>>): Promise<T>;
 
     /**
      * Creates a new rejected promise for the provided reason.
@@ -4807,13 +4839,15 @@ interface PromiseConstructor {
       * @param value A promise.
       * @returns A promise whose internal state matches the provided promise.
       */
-    resolve<T>(value: T | Promise<T>): Promise<T>;
+    resolve<T>(value: T | PromiseLike<T>): Promise<T>;
 
     /**
      * Creates a new resolved promise .
      * @returns A resolved promise.
      */
     resolve(): Promise<void>;
+
+    [Symbol.species]: Function;
 }
 
 declare var Promise: PromiseConstructor;
diff --git a/bin/tsc.js b/bin/tsc.js
index a28c3d7cdb6..653540b7b99 100644
--- a/bin/tsc.js
+++ b/bin/tsc.js
@@ -20229,10 +20229,10 @@ var ts;
     }
     ts.isExternalModuleOrDeclarationFile = isExternalModuleOrDeclarationFile;
     function emitFiles(resolver, host, targetSourceFile) {
-        var extendsHelper = "\nvar __extends = this.__extends || function (d, b) {\n    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];\n    function __() { this.constructor = d; }\n    __.prototype = b.prototype;\n    d.prototype = new __();\n};";
-        var decorateHelper = "\nif (typeof __decorate !== \"function\") __decorate = function (decorators, target, key, desc) {\n    if (typeof Reflect === \"object\" && typeof Reflect.decorate === \"function\") return Reflect.decorate(decorators, target, key, desc);\n    switch (arguments.length) {\n        case 2: return decorators.reduceRight(function(o, d) { return (d && d(o)) || o; }, target);\n        case 3: return decorators.reduceRight(function(o, d) { return (d && d(target, key)), void 0; }, void 0);\n        case 4: return decorators.reduceRight(function(o, d) { return (d && d(target, key, o)) || o; }, desc);\n    }\n};";
-        var metadataHelper = "\nif (typeof __metadata !== \"function\") __metadata = function (k, v) {\n    if (typeof Reflect === \"object\" && typeof Reflect.metadata === \"function\") return Reflect.metadata(k, v);\n};";
-        var paramHelper = "\nif (typeof __param !== \"function\") __param = function (paramIndex, decorator) {\n    return function (target, key) { decorator(target, key, paramIndex); }\n};";
+        var extendsHelper = "\nvar __extends = (this && this.__extends) || function (d, b) {\n    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];\n    function __() { this.constructor = d; }\n    __.prototype = b.prototype;\n    d.prototype = new __();\n};";
+        var decorateHelper = "\nvar __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {\n    if (typeof Reflect === \"object\" && typeof Reflect.decorate === \"function\") return Reflect.decorate(decorators, target, key, desc);\n    switch (arguments.length) {\n        case 2: return decorators.reduceRight(function(o, d) { return (d && d(o)) || o; }, target);\n        case 3: return decorators.reduceRight(function(o, d) { return (d && d(target, key)), void 0; }, void 0);\n        case 4: return decorators.reduceRight(function(o, d) { return (d && d(target, key, o)) || o; }, desc);\n    }\n};";
+        var metadataHelper = "\nvar __metadata = (this && this.__metadata) || function (k, v) {\n    if (typeof Reflect === \"object\" && typeof Reflect.metadata === \"function\") return Reflect.metadata(k, v);\n};";
+        var paramHelper = "\nvar __param = (this && this.__param) || function (paramIndex, decorator) {\n    return function (target, key) { decorator(target, key, paramIndex); }\n};";
         var compilerOptions = host.getCompilerOptions();
         var languageVersion = compilerOptions.target || 0;
         var sourceMapDataList = compilerOptions.sourceMap || compilerOptions.inlineSourceMap ? [] : undefined;
@@ -24590,20 +24590,22 @@ var ts;
                 writeLine();
                 emitDetachedComments(node);
                 var startIndex = emitDirectivePrologues(node.statements, false);
-                if ((languageVersion < 2) && (!extendsEmitted && resolver.getNodeCheckFlags(node) & 8)) {
-                    writeLines(extendsHelper);
-                    extendsEmitted = true;
-                }
-                if (!decorateEmitted && resolver.getNodeCheckFlags(node) & 512) {
-                    writeLines(decorateHelper);
-                    if (compilerOptions.emitDecoratorMetadata) {
-                        writeLines(metadataHelper);
+                if (!compilerOptions.noEmitHelpers) {
+                    if ((languageVersion < 2) && (!extendsEmitted && resolver.getNodeCheckFlags(node) & 8)) {
+                        writeLines(extendsHelper);
+                        extendsEmitted = true;
+                    }
+                    if (!decorateEmitted && resolver.getNodeCheckFlags(node) & 512) {
+                        writeLines(decorateHelper);
+                        if (compilerOptions.emitDecoratorMetadata) {
+                            writeLines(metadataHelper);
+                        }
+                        decorateEmitted = true;
+                    }
+                    if (!paramEmitted && resolver.getNodeCheckFlags(node) & 1024) {
+                        writeLines(paramHelper);
+                        paramEmitted = true;
                     }
-                    decorateEmitted = true;
-                }
-                if (!paramEmitted && resolver.getNodeCheckFlags(node) & 1024) {
-                    writeLines(paramHelper);
-                    paramEmitted = true;
                 }
                 if (ts.isExternalModule(node) || compilerOptions.separateCompilation) {
                     if (languageVersion >= 2) {
@@ -25529,6 +25531,10 @@ var ts;
             type: "boolean",
             description: ts.Diagnostics.Do_not_emit_outputs
         },
+        {
+            name: "noEmitHelpers",
+            type: "boolean"
+        },
         {
             name: "noEmitOnError",
             type: "boolean",
diff --git a/bin/tsserver.js b/bin/tsserver.js
index 1b935be1ece..f49850e8aca 100644
--- a/bin/tsserver.js
+++ b/bin/tsserver.js
@@ -2775,6 +2775,10 @@ var ts;
             type: "boolean",
             description: ts.Diagnostics.Do_not_emit_outputs
         },
+        {
+            name: "noEmitHelpers",
+            type: "boolean"
+        },
         {
             name: "noEmitOnError",
             type: "boolean",
@@ -20599,10 +20603,10 @@ var ts;
     }
     ts.isExternalModuleOrDeclarationFile = isExternalModuleOrDeclarationFile;
     function emitFiles(resolver, host, targetSourceFile) {
-        var extendsHelper = "\nvar __extends = this.__extends || function (d, b) {\n    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];\n    function __() { this.constructor = d; }\n    __.prototype = b.prototype;\n    d.prototype = new __();\n};";
-        var decorateHelper = "\nif (typeof __decorate !== \"function\") __decorate = function (decorators, target, key, desc) {\n    if (typeof Reflect === \"object\" && typeof Reflect.decorate === \"function\") return Reflect.decorate(decorators, target, key, desc);\n    switch (arguments.length) {\n        case 2: return decorators.reduceRight(function(o, d) { return (d && d(o)) || o; }, target);\n        case 3: return decorators.reduceRight(function(o, d) { return (d && d(target, key)), void 0; }, void 0);\n        case 4: return decorators.reduceRight(function(o, d) { return (d && d(target, key, o)) || o; }, desc);\n    }\n};";
-        var metadataHelper = "\nif (typeof __metadata !== \"function\") __metadata = function (k, v) {\n    if (typeof Reflect === \"object\" && typeof Reflect.metadata === \"function\") return Reflect.metadata(k, v);\n};";
-        var paramHelper = "\nif (typeof __param !== \"function\") __param = function (paramIndex, decorator) {\n    return function (target, key) { decorator(target, key, paramIndex); }\n};";
+        var extendsHelper = "\nvar __extends = (this && this.__extends) || function (d, b) {\n    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];\n    function __() { this.constructor = d; }\n    __.prototype = b.prototype;\n    d.prototype = new __();\n};";
+        var decorateHelper = "\nvar __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {\n    if (typeof Reflect === \"object\" && typeof Reflect.decorate === \"function\") return Reflect.decorate(decorators, target, key, desc);\n    switch (arguments.length) {\n        case 2: return decorators.reduceRight(function(o, d) { return (d && d(o)) || o; }, target);\n        case 3: return decorators.reduceRight(function(o, d) { return (d && d(target, key)), void 0; }, void 0);\n        case 4: return decorators.reduceRight(function(o, d) { return (d && d(target, key, o)) || o; }, desc);\n    }\n};";
+        var metadataHelper = "\nvar __metadata = (this && this.__metadata) || function (k, v) {\n    if (typeof Reflect === \"object\" && typeof Reflect.metadata === \"function\") return Reflect.metadata(k, v);\n};";
+        var paramHelper = "\nvar __param = (this && this.__param) || function (paramIndex, decorator) {\n    return function (target, key) { decorator(target, key, paramIndex); }\n};";
         var compilerOptions = host.getCompilerOptions();
         var languageVersion = compilerOptions.target || 0;
         var sourceMapDataList = compilerOptions.sourceMap || compilerOptions.inlineSourceMap ? [] : undefined;
@@ -24960,20 +24964,22 @@ var ts;
                 writeLine();
                 emitDetachedComments(node);
                 var startIndex = emitDirectivePrologues(node.statements, false);
-                if ((languageVersion < 2) && (!extendsEmitted && resolver.getNodeCheckFlags(node) & 8)) {
-                    writeLines(extendsHelper);
-                    extendsEmitted = true;
-                }
-                if (!decorateEmitted && resolver.getNodeCheckFlags(node) & 512) {
-                    writeLines(decorateHelper);
-                    if (compilerOptions.emitDecoratorMetadata) {
-                        writeLines(metadataHelper);
+                if (!compilerOptions.noEmitHelpers) {
+                    if ((languageVersion < 2) && (!extendsEmitted && resolver.getNodeCheckFlags(node) & 8)) {
+                        writeLines(extendsHelper);
+                        extendsEmitted = true;
+                    }
+                    if (!decorateEmitted && resolver.getNodeCheckFlags(node) & 512) {
+                        writeLines(decorateHelper);
+                        if (compilerOptions.emitDecoratorMetadata) {
+                            writeLines(metadataHelper);
+                        }
+                        decorateEmitted = true;
+                    }
+                    if (!paramEmitted && resolver.getNodeCheckFlags(node) & 1024) {
+                        writeLines(paramHelper);
+                        paramEmitted = true;
                     }
-                    decorateEmitted = true;
-                }
-                if (!paramEmitted && resolver.getNodeCheckFlags(node) & 1024) {
-                    writeLines(paramHelper);
-                    paramEmitted = true;
                 }
                 if (ts.isExternalModule(node) || compilerOptions.separateCompilation) {
                     if (languageVersion >= 2) {
@@ -30337,7 +30343,7 @@ var ts;
     })(formatting = ts.formatting || (ts.formatting = {}));
 })(ts || (ts = {}));
 /// <reference path="..\compiler\program.ts"/>
-var __extends = this.__extends || function (d, b) {
+var __extends = (this && this.__extends) || function (d, b) {
     for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
     function __() { this.constructor = d; }
     __.prototype = b.prototype;
diff --git a/bin/typescript.js b/bin/typescript.js
index ed6570707e6..588078a9d94 100644
--- a/bin/typescript.js
+++ b/bin/typescript.js
@@ -24116,13 +24116,13 @@ var ts;
     // targetSourceFile is when users only want one file in entire project to be emitted. This is used in compileOnSave feature
     function emitFiles(resolver, host, targetSourceFile) {
         // emit output for the __extends helper function
-        var extendsHelper = "\nvar __extends = this.__extends || function (d, b) {\n    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];\n    function __() { this.constructor = d; }\n    __.prototype = b.prototype;\n    d.prototype = new __();\n};";
+        var extendsHelper = "\nvar __extends = (this && this.__extends) || function (d, b) {\n    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];\n    function __() { this.constructor = d; }\n    __.prototype = b.prototype;\n    d.prototype = new __();\n};";
         // emit output for the __decorate helper function
-        var decorateHelper = "\nif (typeof __decorate !== \"function\") __decorate = function (decorators, target, key, desc) {\n    if (typeof Reflect === \"object\" && typeof Reflect.decorate === \"function\") return Reflect.decorate(decorators, target, key, desc);\n    switch (arguments.length) {\n        case 2: return decorators.reduceRight(function(o, d) { return (d && d(o)) || o; }, target);\n        case 3: return decorators.reduceRight(function(o, d) { return (d && d(target, key)), void 0; }, void 0);\n        case 4: return decorators.reduceRight(function(o, d) { return (d && d(target, key, o)) || o; }, desc);\n    }\n};";
+        var decorateHelper = "\nvar __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {\n    if (typeof Reflect === \"object\" && typeof Reflect.decorate === \"function\") return Reflect.decorate(decorators, target, key, desc);\n    switch (arguments.length) {\n        case 2: return decorators.reduceRight(function(o, d) { return (d && d(o)) || o; }, target);\n        case 3: return decorators.reduceRight(function(o, d) { return (d && d(target, key)), void 0; }, void 0);\n        case 4: return decorators.reduceRight(function(o, d) { return (d && d(target, key, o)) || o; }, desc);\n    }\n};";
         // emit output for the __metadata helper function
-        var metadataHelper = "\nif (typeof __metadata !== \"function\") __metadata = function (k, v) {\n    if (typeof Reflect === \"object\" && typeof Reflect.metadata === \"function\") return Reflect.metadata(k, v);\n};";
+        var metadataHelper = "\nvar __metadata = (this && this.__metadata) || function (k, v) {\n    if (typeof Reflect === \"object\" && typeof Reflect.metadata === \"function\") return Reflect.metadata(k, v);\n};";
         // emit output for the __param helper function
-        var paramHelper = "\nif (typeof __param !== \"function\") __param = function (paramIndex, decorator) {\n    return function (target, key) { decorator(target, key, paramIndex); }\n};";
+        var paramHelper = "\nvar __param = (this && this.__param) || function (paramIndex, decorator) {\n    return function (target, key) { decorator(target, key, paramIndex); }\n};";
         var compilerOptions = host.getCompilerOptions();
         var languageVersion = compilerOptions.target || 0 /* ES3 */;
         var sourceMapDataList = compilerOptions.sourceMap || compilerOptions.inlineSourceMap ? [] : undefined;
@@ -29109,22 +29109,25 @@ var ts;
                 emitDetachedComments(node);
                 // emit prologue directives prior to __extends
                 var startIndex = emitDirectivePrologues(node.statements, false);
-                // Only Emit __extends function when target ES5.
-                // For target ES6 and above, we can emit classDeclaration as is.
-                if ((languageVersion < 2 /* ES6 */) && (!extendsEmitted && resolver.getNodeCheckFlags(node) & 8 /* EmitExtends */)) {
-                    writeLines(extendsHelper);
-                    extendsEmitted = true;
-                }
-                if (!decorateEmitted && resolver.getNodeCheckFlags(node) & 512 /* EmitDecorate */) {
-                    writeLines(decorateHelper);
-                    if (compilerOptions.emitDecoratorMetadata) {
-                        writeLines(metadataHelper);
+                // Only emit helpers if the user did not say otherwise.
+                if (!compilerOptions.noEmitHelpers) {
+                    // Only Emit __extends function when target ES5.
+                    // For target ES6 and above, we can emit classDeclaration as is.
+                    if ((languageVersion < 2 /* ES6 */) && (!extendsEmitted && resolver.getNodeCheckFlags(node) & 8 /* EmitExtends */)) {
+                        writeLines(extendsHelper);
+                        extendsEmitted = true;
+                    }
+                    if (!decorateEmitted && resolver.getNodeCheckFlags(node) & 512 /* EmitDecorate */) {
+                        writeLines(decorateHelper);
+                        if (compilerOptions.emitDecoratorMetadata) {
+                            writeLines(metadataHelper);
+                        }
+                        decorateEmitted = true;
+                    }
+                    if (!paramEmitted && resolver.getNodeCheckFlags(node) & 1024 /* EmitParam */) {
+                        writeLines(paramHelper);
+                        paramEmitted = true;
                     }
-                    decorateEmitted = true;
-                }
-                if (!paramEmitted && resolver.getNodeCheckFlags(node) & 1024 /* EmitParam */) {
-                    writeLines(paramHelper);
-                    paramEmitted = true;
                 }
                 if (ts.isExternalModule(node) || compilerOptions.separateCompilation) {
                     if (languageVersion >= 2 /* ES6 */) {
@@ -30121,6 +30124,10 @@ var ts;
             type: "boolean",
             description: ts.Diagnostics.Do_not_emit_outputs
         },
+        {
+            name: "noEmitHelpers",
+            type: "boolean"
+        },
         {
             name: "noEmitOnError",
             type: "boolean",
@@ -35472,7 +35479,7 @@ var ts;
     })(formatting = ts.formatting || (ts.formatting = {}));
 })(ts || (ts = {}));
 /// <reference path="..\compiler\program.ts"/>
-var __extends = this.__extends || function (d, b) {
+var __extends = (this && this.__extends) || function (d, b) {
     for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
     function __() { this.constructor = d; }
     __.prototype = b.prototype;
diff --git a/bin/typescriptServices.js b/bin/typescriptServices.js
index ed6570707e6..588078a9d94 100644
--- a/bin/typescriptServices.js
+++ b/bin/typescriptServices.js
@@ -24116,13 +24116,13 @@ var ts;
     // targetSourceFile is when users only want one file in entire project to be emitted. This is used in compileOnSave feature
     function emitFiles(resolver, host, targetSourceFile) {
         // emit output for the __extends helper function
-        var extendsHelper = "\nvar __extends = this.__extends || function (d, b) {\n    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];\n    function __() { this.constructor = d; }\n    __.prototype = b.prototype;\n    d.prototype = new __();\n};";
+        var extendsHelper = "\nvar __extends = (this && this.__extends) || function (d, b) {\n    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];\n    function __() { this.constructor = d; }\n    __.prototype = b.prototype;\n    d.prototype = new __();\n};";
         // emit output for the __decorate helper function
-        var decorateHelper = "\nif (typeof __decorate !== \"function\") __decorate = function (decorators, target, key, desc) {\n    if (typeof Reflect === \"object\" && typeof Reflect.decorate === \"function\") return Reflect.decorate(decorators, target, key, desc);\n    switch (arguments.length) {\n        case 2: return decorators.reduceRight(function(o, d) { return (d && d(o)) || o; }, target);\n        case 3: return decorators.reduceRight(function(o, d) { return (d && d(target, key)), void 0; }, void 0);\n        case 4: return decorators.reduceRight(function(o, d) { return (d && d(target, key, o)) || o; }, desc);\n    }\n};";
+        var decorateHelper = "\nvar __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {\n    if (typeof Reflect === \"object\" && typeof Reflect.decorate === \"function\") return Reflect.decorate(decorators, target, key, desc);\n    switch (arguments.length) {\n        case 2: return decorators.reduceRight(function(o, d) { return (d && d(o)) || o; }, target);\n        case 3: return decorators.reduceRight(function(o, d) { return (d && d(target, key)), void 0; }, void 0);\n        case 4: return decorators.reduceRight(function(o, d) { return (d && d(target, key, o)) || o; }, desc);\n    }\n};";
         // emit output for the __metadata helper function
-        var metadataHelper = "\nif (typeof __metadata !== \"function\") __metadata = function (k, v) {\n    if (typeof Reflect === \"object\" && typeof Reflect.metadata === \"function\") return Reflect.metadata(k, v);\n};";
+        var metadataHelper = "\nvar __metadata = (this && this.__metadata) || function (k, v) {\n    if (typeof Reflect === \"object\" && typeof Reflect.metadata === \"function\") return Reflect.metadata(k, v);\n};";
         // emit output for the __param helper function
-        var paramHelper = "\nif (typeof __param !== \"function\") __param = function (paramIndex, decorator) {\n    return function (target, key) { decorator(target, key, paramIndex); }\n};";
+        var paramHelper = "\nvar __param = (this && this.__param) || function (paramIndex, decorator) {\n    return function (target, key) { decorator(target, key, paramIndex); }\n};";
         var compilerOptions = host.getCompilerOptions();
         var languageVersion = compilerOptions.target || 0 /* ES3 */;
         var sourceMapDataList = compilerOptions.sourceMap || compilerOptions.inlineSourceMap ? [] : undefined;
@@ -29109,22 +29109,25 @@ var ts;
                 emitDetachedComments(node);
                 // emit prologue directives prior to __extends
                 var startIndex = emitDirectivePrologues(node.statements, false);
-                // Only Emit __extends function when target ES5.
-                // For target ES6 and above, we can emit classDeclaration as is.
-                if ((languageVersion < 2 /* ES6 */) && (!extendsEmitted && resolver.getNodeCheckFlags(node) & 8 /* EmitExtends */)) {
-                    writeLines(extendsHelper);
-                    extendsEmitted = true;
-                }
-                if (!decorateEmitted && resolver.getNodeCheckFlags(node) & 512 /* EmitDecorate */) {
-                    writeLines(decorateHelper);
-                    if (compilerOptions.emitDecoratorMetadata) {
-                        writeLines(metadataHelper);
+                // Only emit helpers if the user did not say otherwise.
+                if (!compilerOptions.noEmitHelpers) {
+                    // Only Emit __extends function when target ES5.
+                    // For target ES6 and above, we can emit classDeclaration as is.
+                    if ((languageVersion < 2 /* ES6 */) && (!extendsEmitted && resolver.getNodeCheckFlags(node) & 8 /* EmitExtends */)) {
+                        writeLines(extendsHelper);
+                        extendsEmitted = true;
+                    }
+                    if (!decorateEmitted && resolver.getNodeCheckFlags(node) & 512 /* EmitDecorate */) {
+                        writeLines(decorateHelper);
+                        if (compilerOptions.emitDecoratorMetadata) {
+                            writeLines(metadataHelper);
+                        }
+                        decorateEmitted = true;
+                    }
+                    if (!paramEmitted && resolver.getNodeCheckFlags(node) & 1024 /* EmitParam */) {
+                        writeLines(paramHelper);
+                        paramEmitted = true;
                     }
-                    decorateEmitted = true;
-                }
-                if (!paramEmitted && resolver.getNodeCheckFlags(node) & 1024 /* EmitParam */) {
-                    writeLines(paramHelper);
-                    paramEmitted = true;
                 }
                 if (ts.isExternalModule(node) || compilerOptions.separateCompilation) {
                     if (languageVersion >= 2 /* ES6 */) {
@@ -30121,6 +30124,10 @@ var ts;
             type: "boolean",
             description: ts.Diagnostics.Do_not_emit_outputs
         },
+        {
+            name: "noEmitHelpers",
+            type: "boolean"
+        },
         {
             name: "noEmitOnError",
             type: "boolean",
@@ -35472,7 +35479,7 @@ var ts;
     })(formatting = ts.formatting || (ts.formatting = {}));
 })(ts || (ts = {}));
 /// <reference path="..\compiler\program.ts"/>
-var __extends = this.__extends || function (d, b) {
+var __extends = (this && this.__extends) || function (d, b) {
     for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
     function __() { this.constructor = d; }
     __.prototype = b.prototype;