Fixes helpers in strict mode

.gitignore

@@ -46,3 +46,4 @@ scripts/*.js.map
 coverage/
 internal/
 **/.DS_Store
+.settings/

.npmignore

@@ -4,4 +4,5 @@ scripts
 src
 tests
 Jakefile
-.travis.yml
+.travis.yml
+.settings/

src/compiler/emitter.ts

@@ -18,7 +18,7 @@ module ts {
     export function emitFiles(resolver: EmitResolver, host: EmitHost, targetSourceFile: SourceFile): EmitResult {
         // emit output for the __extends helper function
         const extendsHelper = `
-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;
@@ -27,7 +27,7 @@ var __extends = this.__extends || function (d, b) {
 
         // emit output for the __decorate helper function
         const decorateHelper = `
-if (typeof __decorate !== "function") __decorate = function (decorators, target, key, desc) {
+var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
     if (typeof Reflect === "object" && typeof Reflect.decorate === "function") return Reflect.decorate(decorators, target, key, desc);
     switch (arguments.length) {
         case 2: return decorators.reduceRight(function(o, d) { return (d && d(o)) || o; }, target);
@@ -38,13 +38,13 @@ if (typeof __decorate !== "function") __decorate = function (decorators, target,
 
         // emit output for the __metadata helper function
         const metadataHelper = `
-if (typeof __metadata !== "function") __metadata = function (k, v) {
+var __metadata = (this && this.__metadata) || function (k, v) {
     if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
 };`;
 
         // emit output for the __param helper function
         const paramHelper = `
-if (typeof __param !== "function") __param = function (paramIndex, decorator) {
+var __param = (this && this.__param) || function (paramIndex, decorator) {
     return function (target, key) { decorator(target, key, paramIndex); }
 };`;
 

tests/baselines/reference/ExportClassWithAccessibleTypesInTypeParameterConstraintsClassHeritageListMemberTypeAnnotations.js

@@ -21,7 +21,7 @@ module A {
 
 
 //// [ExportClassWithAccessibleTypesInTypeParameterConstraintsClassHeritageListMemberTypeAnnotations.js]
-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;

tests/baselines/reference/ExportClassWithInaccessibleTypeInTypeParameterConstraint.js

@@ -25,7 +25,7 @@ module A {
 
 
 //// [ExportClassWithInaccessibleTypeInTypeParameterConstraint.js]
-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;

tests/baselines/reference/accessOverriddenBaseClassMember1.js

@@ -16,7 +16,7 @@ class ColoredPoint extends Point {
 
 
 //// [accessOverriddenBaseClassMember1.js]
-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;

tests/baselines/reference/accessors_spec_section-4.5_inference.js

@@ -25,7 +25,7 @@ class LanguageSpec_section_4_5_inference {
 }
 
 //// [accessors_spec_section-4.5_inference.js]
-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;

tests/baselines/reference/aliasUsageInAccessorsOfClass.js

@@ -35,7 +35,7 @@ var Model = (function () {
 })();
 exports.Model = Model;
 //// [aliasUsage1_moduleA.js]
-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;

tests/baselines/reference/aliasUsageInArray.js

@@ -29,7 +29,7 @@ var Model = (function () {
 })();
 exports.Model = Model;
 //// [aliasUsageInArray_moduleA.js]
-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;

tests/baselines/reference/aliasUsageInFunctionExpression.js

@@ -28,7 +28,7 @@ var Model = (function () {
 })();
 exports.Model = Model;
 //// [aliasUsageInFunctionExpression_moduleA.js]
-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;

tests/baselines/reference/aliasUsageInGenericFunction.js

@@ -32,7 +32,7 @@ var Model = (function () {
 })();
 exports.Model = Model;
 //// [aliasUsageInGenericFunction_moduleA.js]
-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;

tests/baselines/reference/aliasUsageInIndexerOfClass.js

@@ -34,7 +34,7 @@ var Model = (function () {
 })();
 exports.Model = Model;
 //// [aliasUsageInIndexerOfClass_moduleA.js]
-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;

tests/baselines/reference/aliasUsageInObjectLiteral.js

@@ -29,7 +29,7 @@ var Model = (function () {
 })();
 exports.Model = Model;
 //// [aliasUsageInObjectLiteral_moduleA.js]
-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;

tests/baselines/reference/aliasUsageInOrExpression.js

@@ -32,7 +32,7 @@ var Model = (function () {
 })();
 exports.Model = Model;
 //// [aliasUsageInOrExpression_moduleA.js]
-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;

tests/baselines/reference/aliasUsageInTypeArgumentOfExtendsClause.js

@@ -32,7 +32,7 @@ var Model = (function () {
 })();
 exports.Model = Model;
 //// [aliasUsageInTypeArgumentOfExtendsClause_moduleA.js]
-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;
@@ -48,7 +48,7 @@ var VisualizationModel = (function (_super) {
 })(Backbone.Model);
 exports.VisualizationModel = VisualizationModel;
 //// [aliasUsageInTypeArgumentOfExtendsClause_main.js]
-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;

tests/baselines/reference/aliasUsageInVarAssignment.js

@@ -28,7 +28,7 @@ var Model = (function () {
 })();
 exports.Model = Model;
 //// [aliasUsageInVarAssignment_moduleA.js]
-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;

tests/baselines/reference/ambiguousOverloadResolution.js

@@ -9,7 +9,7 @@ var x: B;
 var t: number = f(x, x); // Not an error
 
 //// [ambiguousOverloadResolution.js]
-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;

tests/baselines/reference/apparentTypeSubtyping.js

@@ -24,7 +24,7 @@ class Derived2<U extends String> extends Base2 { // error because of the prototy
 //// [apparentTypeSubtyping.js]
 // subtype checks use the apparent type of the target type
 // S is a subtype of a type T, and T is a supertype of S, if one of the following is true, where S' denotes the apparent type (section 3.8.1) of S:
-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;

tests/baselines/reference/apparentTypeSupertype.js

@@ -14,7 +14,7 @@ class Derived<U extends String> extends Base { // error
 //// [apparentTypeSupertype.js]
 // subtype checks use the apparent type of the target type
 // S is a subtype of a type T, and T is a supertype of S, if one of the following is true, where S' denotes the apparent type (section 3.8.1) of S:
-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;

tests/baselines/reference/arrayAssignmentTest1.js

@@ -86,7 +86,7 @@ arr_any = c3; // should be an error - is
 arr_any = i1; // should be an error - is
 
 //// [arrayAssignmentTest1.js]
-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;

tests/baselines/reference/arrayAssignmentTest2.js

@@ -60,7 +60,7 @@ arr_any = i1; // should be an error - is
 
 
 //// [arrayAssignmentTest2.js]
-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;

tests/baselines/reference/arrayBestCommonTypes.js

@@ -108,7 +108,7 @@ module NonEmptyTypes {
 
 
 //// [arrayBestCommonTypes.js]
-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;

tests/baselines/reference/arrayLiteralTypeInference.js

@@ -52,7 +52,7 @@ var z3: { id: number }[] =
 
 
 //// [arrayLiteralTypeInference.js]
-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;

tests/baselines/reference/arrayLiterals.js

@@ -38,7 +38,7 @@ var context4: Base[] = [new Derived1(), new Derived1()];
 
 //// [arrayLiterals.js]
 // Empty array literal with no contextual type has type Undefined[]
-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;

tests/baselines/reference/arrayLiteralsWithRecursiveGenerics.js

@@ -26,7 +26,7 @@ var myDerivedList: DerivedList<number>;
 var as = [list, myDerivedList]; // List<number>[]
 
 //// [arrayLiteralsWithRecursiveGenerics.js]
-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;

tests/baselines/reference/arrowFunctionContexts.js

@@ -97,7 +97,7 @@ var asserted2: any;
 
 
 //// [arrowFunctionContexts.js]
-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;

tests/baselines/reference/assignmentCompatWithCallSignatures3.js

@@ -101,7 +101,7 @@ b18 = a18; // ok
 
 //// [assignmentCompatWithCallSignatures3.js]
 // these are all permitted with the current rules, since we do not do contextual signature instantiation
-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;

tests/baselines/reference/assignmentCompatWithCallSignatures4.js

@@ -100,7 +100,7 @@ module Errors {
 
 //// [assignmentCompatWithCallSignatures4.js]
 // These are mostly permitted with the current loose rules. All ok unless otherwise noted.
-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;

tests/baselines/reference/assignmentCompatWithCallSignatures5.js

@@ -67,7 +67,7 @@ b18 = a18; // ok
 
 //// [assignmentCompatWithCallSignatures5.js]
 // checking assignment compat for function types. No errors in this file
-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;

tests/baselines/reference/assignmentCompatWithCallSignatures6.js

@@ -44,7 +44,7 @@ b16 = x.a16;
 
 //// [assignmentCompatWithCallSignatures6.js]
 // checking assignment compatibility relations for function types. All valid
-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;

tests/baselines/reference/assignmentCompatWithConstructSignatures3.js

@@ -101,7 +101,7 @@ b18 = a18; // ok
 
 //// [assignmentCompatWithConstructSignatures3.js]
 // checking assignment compatibility relations for function types. All of these are valid.
-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;

tests/baselines/reference/assignmentCompatWithConstructSignatures4.js

@@ -100,7 +100,7 @@ module Errors {
 
 //// [assignmentCompatWithConstructSignatures4.js]
 // checking assignment compatibility relations for function types.
-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;

tests/baselines/reference/assignmentCompatWithConstructSignatures5.js

@@ -67,7 +67,7 @@ b18 = a18; // ok
 
 //// [assignmentCompatWithConstructSignatures5.js]
 // checking assignment compat for function types. All valid
-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;

tests/baselines/reference/assignmentCompatWithConstructSignatures6.js

@@ -44,7 +44,7 @@ b16 = x.a16;
 
 //// [assignmentCompatWithConstructSignatures6.js]
 // checking assignment compatibility relations for function types. All valid.
-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;

tests/baselines/reference/assignmentCompatWithNumericIndexer.js

@@ -45,7 +45,7 @@ module Generics {
 
 //// [assignmentCompatWithNumericIndexer.js]
 // Derived type indexer must be subtype of base type indexer
-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;

tests/baselines/reference/assignmentCompatWithNumericIndexer3.js

@@ -42,7 +42,7 @@ module Generics {
 
 //// [assignmentCompatWithNumericIndexer3.js]
 // Derived type indexer must be subtype of base type indexer
-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;

tests/baselines/reference/assignmentCompatWithObjectMembers4.js

@@ -93,7 +93,7 @@ module WithBase {
 
 //// [assignmentCompatWithObjectMembers4.js]
 // members N and M of types S and T have the same name, same accessibility, same optionality, and N is not assignable M
-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;

tests/baselines/reference/assignmentCompatWithObjectMembersOptionality.js

@@ -90,7 +90,7 @@ module SourceHasOptional {
 
 //// [assignmentCompatWithObjectMembersOptionality.js]
 // Derived member is not optional but base member is, should be ok
-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;

tests/baselines/reference/assignmentCompatWithObjectMembersOptionality2.js

@@ -92,7 +92,7 @@ module SourceHasOptional {
 //// [assignmentCompatWithObjectMembersOptionality2.js]
 // M is optional and S contains no property with the same name as M
 // N is optional and T contains no property with the same name as N
-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;

tests/baselines/reference/assignmentCompatWithStringIndexer.js

@@ -55,7 +55,7 @@ module Generics {
 
 //// [assignmentCompatWithStringIndexer.js]
 // index signatures must be compatible in assignments
-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;

tests/baselines/reference/assignmentLHSIsValue.js

@@ -71,7 +71,7 @@ foo() = value;
 (foo()) = value;
 
 //// [assignmentLHSIsValue.js]
-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;

tests/baselines/reference/autolift4.js

@@ -24,7 +24,7 @@ class Point3D extends Point {
 
 
 //// [autolift4.js]
-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;

tests/baselines/reference/baseCheck.js

@@ -30,7 +30,7 @@ function f() {
 
 
 //// [baseCheck.js]
-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;

tests/baselines/reference/baseIndexSignatureResolution.js

@@ -25,7 +25,7 @@ var z: Derived = b.foo();
 */
 
 //// [baseIndexSignatureResolution.js]
-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;

tests/baselines/reference/baseTypeOrderChecking.js

@@ -37,7 +37,7 @@ class Class4<T> extends Class3<T>
 
 
 //// [baseTypeOrderChecking.js]
-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;

tests/baselines/reference/baseTypeWrappingInstantiationChain.js

@@ -27,7 +27,7 @@ class Wrapper<T5> {
 }
 
 //// [baseTypeWrappingInstantiationChain.js]
-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;

tests/baselines/reference/bases.js

@@ -21,7 +21,7 @@ new C().y;
 
 
 //// [bases.js]
-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;

tests/baselines/reference/bestCommonTypeOfConditionalExpressions.js

@@ -29,7 +29,7 @@ function foo5<T, U>(t: T, u: U): Object {
 //// [bestCommonTypeOfConditionalExpressions.js]
 // conditional expressions return the best common type of the branches plus contextual type (using the first candidate if multiple BCTs exist)
 // no errors expected here
-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;

tests/baselines/reference/bestCommonTypeOfConditionalExpressions2.js

@@ -27,7 +27,7 @@ function foo3<T extends U, U extends V, V>(t: T, u: U) {
 //// [bestCommonTypeOfConditionalExpressions2.js]
 // conditional expressions return the best common type of the branches plus contextual type (using the first candidate if multiple BCTs exist)
 // these are errors
-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;

tests/baselines/reference/bestCommonTypeOfTuple2.js

@@ -23,7 +23,7 @@ var e51 = t5[2]; // {}
 
 
 //// [bestCommonTypeOfTuple2.js]
-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;

tests/baselines/reference/callSignatureAssignabilityInInheritance2.js

@@ -71,7 +71,7 @@ interface I extends A {
 
 //// [callSignatureAssignabilityInInheritance2.js]
 // checking subtype relations for function types as it relates to contextual signature instantiation
-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;

tests/baselines/reference/callSignatureAssignabilityInInheritance3.js

@@ -116,7 +116,7 @@ module Errors {
 //// [callSignatureAssignabilityInInheritance3.js]
 // checking subtype relations for function types as it relates to contextual signature instantiation
 // error cases
-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;

tests/baselines/reference/callSignatureAssignabilityInInheritance4.js

@@ -51,7 +51,7 @@ interface I extends A {
 
 //// [callSignatureAssignabilityInInheritance4.js]
 // checking subtype relations for function types as it relates to contextual signature instantiation
-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;

tests/baselines/reference/callSignatureAssignabilityInInheritance5.js

@@ -51,7 +51,7 @@ interface I extends B {
 //// [callSignatureAssignabilityInInheritance5.js]
 // checking subtype relations for function types as it relates to contextual signature instantiation
 // same as subtypingWithCallSignatures2 just with an extra level of indirection in the inheritance chain
-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;

tests/baselines/reference/callSignatureAssignabilityInInheritance6.js

@@ -54,7 +54,7 @@ interface I9<T> extends A {
 // checking subtype relations for function types as it relates to contextual signature instantiation
 // same as subtypingWithCallSignatures4 but using class type parameters instead of generic signatures
 // all are errors
-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;

tests/baselines/reference/callWithSpread.js

@@ -54,7 +54,7 @@ var c = new C(1, 2, ...a);
 
 
 //// [callWithSpread.js]
-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;

tests/baselines/reference/captureThisInSuperCall.js

@@ -9,7 +9,7 @@ class B extends A {
 }
 
 //// [captureThisInSuperCall.js]
-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;

tests/baselines/reference/castingTuple.js

@@ -33,7 +33,7 @@ t4[2] = 10;
 
 
 //// [castingTuple.js]
-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;

tests/baselines/reference/chainedAssignment3.js

@@ -23,7 +23,7 @@ a = b = new A();
 
 
 //// [chainedAssignment3.js]
-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;

tests/baselines/reference/chainedCallsWithTypeParameterConstrainedToOtherTypeParameter.js

@@ -20,7 +20,7 @@ class C extends B {
 (new Chain(new A)).then(a => new B).then(b => new C).then(c => new B).then(b => new A);
 
 //// [chainedCallsWithTypeParameterConstrainedToOtherTypeParameter.js]
-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;

tests/baselines/reference/checkForObjectTooStrict.js

@@ -32,7 +32,7 @@ class Baz extends Object {
 
 
 //// [checkForObjectTooStrict.js]
-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;

tests/baselines/reference/circularImportAlias.js

@@ -21,7 +21,7 @@ var c = new B.a.C();
 
 //// [circularImportAlias.js]
 // expected no error
-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;

tests/baselines/reference/classConstructorParametersAccessibility.js

@@ -27,7 +27,7 @@ class Derived extends C3 {
 
 
 //// [classConstructorParametersAccessibility.js]
-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;

tests/baselines/reference/classConstructorParametersAccessibility2.js

@@ -27,7 +27,7 @@ class Derived extends C3 {
 
 
 //// [classConstructorParametersAccessibility2.js]
-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;

tests/baselines/reference/classConstructorParametersAccessibility3.js

@@ -14,7 +14,7 @@ var d: Derived;
 d.p;  // public, OK
 
 //// [classConstructorParametersAccessibility3.js]
-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;

tests/baselines/reference/classDeclarationMergedInModuleWithContinuation.js

@@ -12,7 +12,7 @@ module M {
 }
 
 //// [classDeclarationMergedInModuleWithContinuation.js]
-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;

tests/baselines/reference/classDoesNotDependOnBaseTypes.js

@@ -13,7 +13,7 @@ class StringTreeCollectionBase {
 class StringTreeCollection extends StringTreeCollectionBase { }
 
 //// [classDoesNotDependOnBaseTypes.js]
-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;

tests/baselines/reference/classExpressionWithDecorator1.js

@@ -2,7 +2,7 @@
 var v = @decorate class C { static p = 1 };
 
 //// [classExpressionWithDecorator1.js]
-if (typeof __decorate !== "function") __decorate = function (decorators, target, key, desc) {
+var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
     if (typeof Reflect === "object" && typeof Reflect.decorate === "function") return Reflect.decorate(decorators, target, key, desc);
     switch (arguments.length) {
         case 2: return decorators.reduceRight(function(o, d) { return (d && d(o)) || o; }, target);

tests/baselines/reference/classExtendingClass.js

@@ -32,7 +32,7 @@ var r7 = d2.thing('');
 var r8 = D2.other(1);
 
 //// [classExtendingClass.js]
-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;

tests/baselines/reference/classExtendingPrimitive.js

@@ -16,7 +16,7 @@ class C8 extends E { }
 
 //// [classExtendingPrimitive.js]
 // classes cannot extend primitives
-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;

tests/baselines/reference/classExtendingPrimitive2.js

@@ -6,7 +6,7 @@ class C5a extends null { }
 
 //// [classExtendingPrimitive2.js]
 // classes cannot extend primitives
-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;

tests/baselines/reference/classExtendingQualifiedName.js

@@ -8,7 +8,7 @@ module M {
 }
 
 //// [classExtendingQualifiedName.js]
-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;

tests/baselines/reference/classExtendingQualifiedName2.js

@@ -8,7 +8,7 @@ module M {
 }
 
 //// [classExtendingQualifiedName2.js]
-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;

tests/baselines/reference/classExtendsClauseClassMergedWithModuleNotReferingConstructor.js

@@ -14,7 +14,7 @@ module Foo {
 }
 
 //// [classExtendsClauseClassMergedWithModuleNotReferingConstructor.js]
-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;

tests/baselines/reference/classExtendsClauseClassNotReferringConstructor.js

@@ -7,7 +7,7 @@ module Foo {
 
 
 //// [classExtendsClauseClassNotReferringConstructor.js]
-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;

tests/baselines/reference/classExtendsEveryObjectType.js

@@ -17,7 +17,7 @@ class C5 extends foo { } // error
 class C6 extends []{ } // error
 
 //// [classExtendsEveryObjectType.js]
-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;

tests/baselines/reference/classExtendsEveryObjectType2.js

@@ -4,7 +4,7 @@ class C2 extends { foo: string; } { } // error
 class C6 extends []{ } // error
 
 //// [classExtendsEveryObjectType2.js]
-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;

tests/baselines/reference/classExtendsInterface.js

@@ -9,7 +9,7 @@ class B2<T> implements Comparable2<T> {}
 
 
 //// [classExtendsInterface.js]
-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;

tests/baselines/reference/classExtendsItself.js

@@ -6,7 +6,7 @@ class D<T> extends D<T> { } // error
 class E<T> extends E<string> { } // error
 
 //// [classExtendsItself.js]
-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;

tests/baselines/reference/classExtendsItselfIndirectly.js

@@ -12,7 +12,7 @@ class D2<T> extends C2<T> { bar: T; }
 class E2<T> extends D2<T> { baz: T; }
 
 //// [classExtendsItselfIndirectly.js]
-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;

tests/baselines/reference/classExtendsItselfIndirectly2.js

@@ -23,7 +23,7 @@ module O {
 }
 
 //// [classExtendsItselfIndirectly2.js]
-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;

tests/baselines/reference/classExtendsItselfIndirectly3.js

@@ -19,7 +19,7 @@ class D2<T> extends C2<T> { bar: T; }
 class E2<T> extends D2<T> { baz: T; }
 
 //// [classExtendsItselfIndirectly_file1.js]
-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;
@@ -33,7 +33,7 @@ var C = (function (_super) {
     return C;
 })(E); // error
 //// [classExtendsItselfIndirectly_file2.js]
-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;
@@ -47,7 +47,7 @@ var D = (function (_super) {
     return D;
 })(C);
 //// [classExtendsItselfIndirectly_file3.js]
-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;
@@ -61,7 +61,7 @@ var E = (function (_super) {
     return E;
 })(D);
 //// [classExtendsItselfIndirectly_file4.js]
-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;
@@ -75,7 +75,7 @@ var C2 = (function (_super) {
     return C2;
 })(E2); // error
 //// [classExtendsItselfIndirectly_file5.js]
-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;
@@ -89,7 +89,7 @@ var D2 = (function (_super) {
     return D2;
 })(C2);
 //// [classExtendsItselfIndirectly_file6.js]
-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;

tests/baselines/reference/classExtendsMultipleBaseClasses.js

@@ -4,7 +4,7 @@ class B { }
 class C extends A,B { }
 
 //// [classExtendsMultipleBaseClasses.js]
-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;

tests/baselines/reference/classExtendsShadowedConstructorFunction.js

@@ -9,7 +9,7 @@ module M {
 }
 
 //// [classExtendsShadowedConstructorFunction.js]
-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;

tests/baselines/reference/classExtendsValidConstructorFunction.js

@@ -6,7 +6,7 @@ var x = new foo(); // can be used as a constructor function
 class C extends foo { } // error, cannot extend it though
 
 //// [classExtendsValidConstructorFunction.js]
-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;

tests/baselines/reference/classHeritageWithTrailingSeparator.js

@@ -4,7 +4,7 @@ class D extends C, {
 }
 
 //// [classHeritageWithTrailingSeparator.js]
-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;

tests/baselines/reference/classImplementsClass2.js

@@ -14,7 +14,7 @@ c = c2;
 c2 = c;
 
 //// [classImplementsClass2.js]
-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;

tests/baselines/reference/classImplementsClass3.js

@@ -15,7 +15,7 @@ c = c2;
 c2 = c;
 
 //// [classImplementsClass3.js]
-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;

tests/baselines/reference/classImplementsClass4.js

@@ -17,7 +17,7 @@ c = c2;
 c2 = c;
 
 //// [classImplementsClass4.js]
-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;

tests/baselines/reference/classImplementsClass5.js

@@ -18,7 +18,7 @@ c = c2;
 c2 = c;
 
 //// [classImplementsClass5.js]
-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;

tests/baselines/reference/classImplementsClass6.js

@@ -22,7 +22,7 @@ c.bar(); // error
 c2.bar(); // should error
 
 //// [classImplementsClass6.js]
-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;

tests/baselines/reference/classIndexer3.js

@@ -11,7 +11,7 @@ class D123 extends C123 {
 }
 
 //// [classIndexer3.js]
-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;

tests/baselines/reference/classInheritence.js

@@ -3,7 +3,7 @@ class B extends A { }
 class A extends A { }
 
 //// [classInheritence.js]
-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;

tests/baselines/reference/classIsSubtypeOfBaseType.js

@@ -16,7 +16,7 @@ class Derived2 extends Base<{ bar: string; }> {
 }
 
 //// [classIsSubtypeOfBaseType.js]
-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;

tests/baselines/reference/classOrder2.js

@@ -20,7 +20,7 @@ a.foo();
 
 
 //// [classOrder2.js]
-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;

tests/baselines/reference/classOrderBug.js

@@ -16,7 +16,7 @@ class foo extends baz {}
 
 
 //// [classOrderBug.js]
-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;

tests/baselines/reference/classSideInheritance1.js

@@ -16,7 +16,7 @@ A.bar(); // valid
 C2.bar(); // valid
 
 //// [classSideInheritance1.js]
-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;

tests/baselines/reference/classSideInheritance2.js

@@ -21,7 +21,7 @@ class TextBase implements IText {
 }
 
 //// [classSideInheritance2.js]
-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;

tests/baselines/reference/classSideInheritance3.js

@@ -19,7 +19,7 @@ var r2: new (x: string) => A = B; // error
 var r3: typeof A = C; // ok
 
 //// [classSideInheritance3.js]
-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;

tests/baselines/reference/classUpdateTests.js

@@ -114,7 +114,7 @@ class R {
 }
 
 //// [classUpdateTests.js]
-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;