change class inheritance code

src/compiler/transformers/es2015.ts

@@ -3338,7 +3338,7 @@ namespace ts {
         priority: 0,
         text: `
             var __extends = (this && this.__extends) || function (d, b) {
-                for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+                Object.setPrototypeOf(d, b);
                 function __() { this.constructor = d; }
                 d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
             };`

tests/baselines/reference/ExportClassWithAccessibleTypesInTypeParameterConstraintsClassHeritageListMemberTypeAnnotations.js

@@ -22,7 +22,7 @@ module A {
 
 //// [ExportClassWithAccessibleTypesInTypeParameterConstraintsClassHeritageListMemberTypeAnnotations.js]
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/ExportClassWithInaccessibleTypeInTypeParameterConstraint.js

@@ -26,7 +26,7 @@ module A {
 
 //// [ExportClassWithInaccessibleTypeInTypeParameterConstraint.js]
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/abstractClassInLocalScope.js

@@ -9,7 +9,7 @@
 
 //// [abstractClassInLocalScope.js]
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/abstractClassInLocalScopeIsAbstract.js

@@ -9,7 +9,7 @@
 
 //// [abstractClassInLocalScopeIsAbstract.js]
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/abstractProperty.js

@@ -23,7 +23,7 @@ class C extends B {
 
 //// [abstractProperty.js]
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/abstractPropertyNegative.js

@@ -45,7 +45,7 @@ abstract class AbstractAccessorMismatch {
 
 //// [abstractPropertyNegative.js]
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/accessOverriddenBaseClassMember1.js

@@ -17,7 +17,7 @@ class ColoredPoint extends Point {
 
 //// [accessOverriddenBaseClassMember1.js]
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

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

@@ -26,7 +26,7 @@ class LanguageSpec_section_4_5_inference {
 
 //// [accessors_spec_section-4.5_inference.js]
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/aliasUsageInAccessorsOfClass.js

@@ -38,7 +38,7 @@ exports.Model = Model;
 //// [aliasUsage1_moduleA.js]
 "use strict";
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/aliasUsageInArray.js

@@ -32,7 +32,7 @@ exports.Model = Model;
 //// [aliasUsageInArray_moduleA.js]
 "use strict";
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/aliasUsageInFunctionExpression.js

@@ -31,7 +31,7 @@ exports.Model = Model;
 //// [aliasUsageInFunctionExpression_moduleA.js]
 "use strict";
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/aliasUsageInGenericFunction.js

@@ -35,7 +35,7 @@ exports.Model = Model;
 //// [aliasUsageInGenericFunction_moduleA.js]
 "use strict";
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/aliasUsageInIndexerOfClass.js

@@ -37,7 +37,7 @@ exports.Model = Model;
 //// [aliasUsageInIndexerOfClass_moduleA.js]
 "use strict";
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/aliasUsageInObjectLiteral.js

@@ -32,7 +32,7 @@ exports.Model = Model;
 //// [aliasUsageInObjectLiteral_moduleA.js]
 "use strict";
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/aliasUsageInOrExpression.js

@@ -35,7 +35,7 @@ exports.Model = Model;
 //// [aliasUsageInOrExpression_moduleA.js]
 "use strict";
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/aliasUsageInTypeArgumentOfExtendsClause.js

@@ -35,7 +35,7 @@ exports.Model = Model;
 //// [aliasUsageInTypeArgumentOfExtendsClause_moduleA.js]
 "use strict";
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };
@@ -51,7 +51,7 @@ exports.VisualizationModel = VisualizationModel;
 //// [aliasUsageInTypeArgumentOfExtendsClause_main.js]
 "use strict";
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/aliasUsageInVarAssignment.js

@@ -31,7 +31,7 @@ exports.Model = Model;
 //// [aliasUsageInVarAssignment_moduleA.js]
 "use strict";
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/ambiguousOverloadResolution.js

@@ -10,7 +10,7 @@ var t: number = f(x, x); // Not an error
 
 //// [ambiguousOverloadResolution.js]
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/apparentTypeSubtyping.js

@@ -25,7 +25,7 @@ class Derived2<U extends String> extends Base2 { // error because of the prototy
 // 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 && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/apparentTypeSupertype.js

@@ -15,7 +15,7 @@ class Derived<U extends String> extends Base { // error
 // 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 && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/arrayAssignmentTest1.js

@@ -87,7 +87,7 @@ arr_any = i1; // should be an error - is
 
 //// [arrayAssignmentTest1.js]
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/arrayAssignmentTest2.js

@@ -61,7 +61,7 @@ arr_any = i1; // should be an error - is
 
 //// [arrayAssignmentTest2.js]
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/arrayBestCommonTypes.js

@@ -109,7 +109,7 @@ module NonEmptyTypes {
 
 //// [arrayBestCommonTypes.js]
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/arrayLiteralTypeInference.js

@@ -53,7 +53,7 @@ var z3: { id: number }[] =
 
 //// [arrayLiteralTypeInference.js]
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/arrayLiterals.js

@@ -39,7 +39,7 @@ var context4: Base[] = [new Derived1(), new Derived1()];
 //// [arrayLiterals.js]
 // Empty array literal with no contextual type has type Undefined[]
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/arrayLiteralsWithRecursiveGenerics.js

@@ -27,7 +27,7 @@ var as = [list, myDerivedList]; // List<number>[]
 
 //// [arrayLiteralsWithRecursiveGenerics.js]
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/arrayOfSubtypeIsAssignableToReadonlyArray.js

@@ -21,7 +21,7 @@ rrb = cra; // error: 'A' is not assignable to 'B'
 
 //// [arrayOfSubtypeIsAssignableToReadonlyArray.js]
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/arrowFunctionContexts.js

@@ -98,7 +98,7 @@ var asserted2: any;
 
 //// [arrowFunctionContexts.js]
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/assignmentCompatWithCallSignatures3.js

@@ -102,7 +102,7 @@ b18 = a18; // ok
 //// [assignmentCompatWithCallSignatures3.js]
 // these are all permitted with the current rules, since we do not do contextual signature instantiation
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/assignmentCompatWithCallSignatures4.js

@@ -101,7 +101,7 @@ module Errors {
 //// [assignmentCompatWithCallSignatures4.js]
 // These are mostly permitted with the current loose rules. All ok unless otherwise noted.
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/assignmentCompatWithCallSignatures5.js

@@ -68,7 +68,7 @@ b18 = a18; // ok
 //// [assignmentCompatWithCallSignatures5.js]
 // checking assignment compat for function types. No errors in this file
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/assignmentCompatWithCallSignatures6.js

@@ -45,7 +45,7 @@ b16 = x.a16;
 //// [assignmentCompatWithCallSignatures6.js]
 // checking assignment compatibility relations for function types. All valid
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/assignmentCompatWithConstructSignatures3.js

@@ -102,7 +102,7 @@ b18 = a18; // ok
 //// [assignmentCompatWithConstructSignatures3.js]
 // checking assignment compatibility relations for function types. All of these are valid.
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/assignmentCompatWithConstructSignatures4.js

@@ -101,7 +101,7 @@ module Errors {
 //// [assignmentCompatWithConstructSignatures4.js]
 // checking assignment compatibility relations for function types.
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/assignmentCompatWithConstructSignatures5.js

@@ -68,7 +68,7 @@ b18 = a18; // ok
 //// [assignmentCompatWithConstructSignatures5.js]
 // checking assignment compat for function types. All valid
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/assignmentCompatWithConstructSignatures6.js

@@ -45,7 +45,7 @@ b16 = x.a16;
 //// [assignmentCompatWithConstructSignatures6.js]
 // checking assignment compatibility relations for function types. All valid.
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/assignmentCompatWithNumericIndexer.js

@@ -46,7 +46,7 @@ module Generics {
 //// [assignmentCompatWithNumericIndexer.js]
 // Derived type indexer must be subtype of base type indexer
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/assignmentCompatWithNumericIndexer3.js

@@ -43,7 +43,7 @@ module Generics {
 //// [assignmentCompatWithNumericIndexer3.js]
 // Derived type indexer must be subtype of base type indexer
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/assignmentCompatWithObjectMembers4.js

@@ -94,7 +94,7 @@ 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 && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/assignmentCompatWithObjectMembersOptionality.js

@@ -91,7 +91,7 @@ module SourceHasOptional {
 //// [assignmentCompatWithObjectMembersOptionality.js]
 // Derived member is not optional but base member is, should be ok
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/assignmentCompatWithObjectMembersOptionality2.js

@@ -93,7 +93,7 @@ module SourceHasOptional {
 // 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 && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };

tests/baselines/reference/assignmentCompatWithStringIndexer.js

@@ -56,7 +56,7 @@ module Generics {
 //// [assignmentCompatWithStringIndexer.js]
 // index signatures must be compatible in assignments
 var __extends = (this && this.__extends) || function (d, b) {
-    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
+    Object.setPrototypeOf(d, b);
     function __() { this.constructor = d; }
     d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
 };