Revert "Wrap classes with decorators or static properties in an IIFE,…

src/compiler/transformers/ts.ts

@@ -23,10 +23,11 @@ namespace ts {
         IsNamedExternalExport = 1 << 4,
         IsDefaultExternalExport = 1 << 5,
         IsDerivedClass = 1 << 6,
+        UseImmediatelyInvokedFunctionExpression = 1 << 7,
 
         HasAnyDecorators = HasConstructorDecorators | HasMemberDecorators,
         NeedsName = HasStaticInitializedProperties | HasMemberDecorators,
-        UseImmediatelyInvokedFunctionExpression = HasAnyDecorators | HasStaticInitializedProperties,
+        MayNeedImmediatelyInvokedFunctionExpression = HasAnyDecorators | HasStaticInitializedProperties,
         IsExported = IsExportOfNamespace | IsDefaultExternalExport | IsNamedExternalExport,
     }
 
@@ -595,6 +596,7 @@ namespace ts {
             if (isExportOfNamespace(node)) facts |= ClassFacts.IsExportOfNamespace;
             else if (isDefaultExternalModuleExport(node)) facts |= ClassFacts.IsDefaultExternalExport;
             else if (isNamedExternalModuleExport(node)) facts |= ClassFacts.IsNamedExternalExport;
+            if (languageVersion <= ScriptTarget.ES5 && (facts & ClassFacts.MayNeedImmediatelyInvokedFunctionExpression)) facts |= ClassFacts.UseImmediatelyInvokedFunctionExpression;
             return facts;
         }
 
@@ -665,12 +667,6 @@ namespace ts {
                 const iife = createImmediatelyInvokedArrowFunction(statements);
                 setEmitFlags(iife, EmitFlags.TypeScriptClassWrapper);
 
-                // Class comment is already added by the ES2015 transform when targeting ES5 or below.
-                // Only add if targetting ES2015+ to prevent duplicates
-                if (languageVersion > ScriptTarget.ES5) {
-                    addSyntheticLeadingComment(iife, SyntaxKind.MultiLineCommentTrivia, "* @class ");
-                }
-
                 const varStatement = createVariableStatement(
                     /*modifiers*/ undefined,
                     createVariableDeclarationList([
@@ -679,7 +675,7 @@ namespace ts {
                             /*type*/ undefined,
                             iife
                         )
-                    ], languageVersion > ScriptTarget.ES5 ? NodeFlags.Let : undefined)
+                    ])
                 );
 
                 setOriginalNode(varStatement, node);

tests/baselines/reference/awaitAndYieldInProperty.js

@@ -19,31 +19,27 @@ async function* test(x: Promise<string>) {
 
 //// [awaitAndYieldInProperty.js]
 async function* test(x) {
-    var _a, _b, _c, _d, _e;
-    let C = /** @class */ (() => {
-        var _e, _f, _g, _h;
-        class C {
+    var _a, _b, _c, _d, _e, _f, _g, _h, _j;
+    class C {
+        constructor() {
+            this[_a] = await x;
+            this[_c] = yield 2;
+        }
+    }
+    _a = await x, _b = await x, _c = yield 1, _d = yield 3;
+    C[_b] = await x;
+    C[_d] = yield 4;
+    return _j = class {
             constructor() {
                 this[_e] = await x;
                 this[_g] = yield 2;
             }
-        }
-        _e = await x, _f = await x, _g = yield 1, _h = yield 3;
-        C[_f] = await x;
-        C[_h] = yield 4;
-        return C;
-    })();
-    return _e = class {
-            constructor() {
-                this[_a] = await x;
-                this[_c] = yield 2;
-            }
         },
-        _a = await x,
-        _b = await x,
-        _c = yield 1,
-        _d = yield 3,
-        _e[_b] = await x,
-        _e[_d] = yield 4,
-        _e;
+        _e = await x,
+        _f = await x,
+        _g = yield 1,
+        _h = yield 3,
+        _j[_f] = await x,
+        _j[_h] = yield 4,
+        _j;
 }

tests/baselines/reference/classDeclarationCheckUsedBeforeDefinitionInItself.js

@@ -4,9 +4,6 @@ class C3 {
 }
 
 //// [classDeclarationCheckUsedBeforeDefinitionInItself.js]
-let C3 = /** @class */ (() => {
-    class C3 {
-    }
-    C3.intance = new C3(); // ok
-    return C3;
-})();
+class C3 {
+}
+C3.intance = new C3(); // ok

tests/baselines/reference/computedPropertyNames12_ES6.js

@@ -17,19 +17,16 @@ class C {
 }
 
 //// [computedPropertyNames12_ES6.js]
+var _a, _b, _c;
 var s;
 var n;
 var a;
-let C = /** @class */ (() => {
-    var _a, _b, _c;
-    class C {
-        constructor() {
-            this[_a] = n;
-            this[_b] = 2;
-            this[`hello bye`] = 0;
-        }
+class C {
+    constructor() {
+        this[_a] = n;
+        this[_b] = 2;
+        this[`hello bye`] = 0;
     }
-    _a = n, s + s, _b = s + n, +s, _c = `hello ${a} bye`;
-    C[_c] = 0;
-    return C;
-})();
+}
+_a = n, s + s, _b = s + n, +s, _c = `hello ${a} bye`;
+C[_c] = 0;

tests/baselines/reference/computedPropertyNamesWithStaticProperty.js

@@ -11,16 +11,13 @@ class C {
 }
 
 //// [computedPropertyNamesWithStaticProperty.js]
-let C = /** @class */ (() => {
-    class C {
-        get [C.staticProp]() {
-            return "hello";
-        }
-        set [C.staticProp](x) {
-            var y = x;
-        }
-        [C.staticProp]() { }
+class C {
+    get [C.staticProp]() {
+        return "hello";
     }
-    C.staticProp = 10;
-    return C;
-})();
+    set [C.staticProp](x) {
+        var y = x;
+    }
+    [C.staticProp]() { }
+}
+C.staticProp = 10;

tests/baselines/reference/decoratedClassExportsCommonJS1.js

@@ -14,16 +14,13 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
+var Testing123_1;
 Object.defineProperty(exports, "__esModule", { value: true });
 exports.Testing123 = void 0;
-let Testing123 = /** @class */ (() => {
-    var Testing123_1;
-    let Testing123 = Testing123_1 = class Testing123 {
-    };
-    Testing123.prop1 = Testing123_1.prop0;
-    Testing123 = Testing123_1 = __decorate([
-        Something({ v: () => Testing123_1 })
-    ], Testing123);
-    return Testing123;
-})();
+let Testing123 = Testing123_1 = class Testing123 {
+};
+Testing123.prop1 = Testing123_1.prop0;
+Testing123 = Testing123_1 = __decorate([
+    Something({ v: () => Testing123_1 })
+], Testing123);
 exports.Testing123 = Testing123;

tests/baselines/reference/decoratedClassExportsCommonJS2.js

@@ -12,15 +12,12 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
+var Testing123_1;
 Object.defineProperty(exports, "__esModule", { value: true });
 exports.Testing123 = void 0;
-let Testing123 = /** @class */ (() => {
-    var Testing123_1;
-    let Testing123 = Testing123_1 = class Testing123 {
-    };
-    Testing123 = Testing123_1 = __decorate([
-        Something({ v: () => Testing123_1 })
-    ], Testing123);
-    return Testing123;
-})();
+let Testing123 = Testing123_1 = class Testing123 {
+};
+Testing123 = Testing123_1 = __decorate([
+    Something({ v: () => Testing123_1 })
+], Testing123);
 exports.Testing123 = Testing123;

tests/baselines/reference/decoratedClassExportsSystem1.js

@@ -16,21 +16,17 @@ System.register([], function (exports_1, context_1) {
         else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
         return c > 3 && r && Object.defineProperty(target, key, r), r;
     };
-    var Testing123;
+    var Testing123_1, Testing123;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
         execute: function () {
-            Testing123 = /** @class */ (() => {
-                var Testing123_1;
-                let Testing123 = Testing123_1 = class Testing123 {
-                };
-                Testing123.prop1 = Testing123_1.prop0;
-                Testing123 = Testing123_1 = __decorate([
-                    Something({ v: () => Testing123_1 })
-                ], Testing123);
-                return Testing123;
-            })();
+            Testing123 = Testing123_1 = class Testing123 {
+            };
+            Testing123.prop1 = Testing123_1.prop0;
+            Testing123 = Testing123_1 = __decorate([
+                Something({ v: () => Testing123_1 })
+            ], Testing123);
             exports_1("Testing123", Testing123);
         }
     };

tests/baselines/reference/decoratedClassExportsSystem2.js

@@ -13,20 +13,16 @@ System.register([], function (exports_1, context_1) {
         else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
         return c > 3 && r && Object.defineProperty(target, key, r), r;
     };
-    var Testing123;
+    var Testing123_1, Testing123;
     var __moduleName = context_1 && context_1.id;
     return {
         setters: [],
         execute: function () {
-            Testing123 = /** @class */ (() => {
-                var Testing123_1;
-                let Testing123 = Testing123_1 = class Testing123 {
-                };
-                Testing123 = Testing123_1 = __decorate([
-                    Something({ v: () => Testing123_1 })
-                ], Testing123);
-                return Testing123;
-            })();
+            Testing123 = Testing123_1 = class Testing123 {
+            };
+            Testing123 = Testing123_1 = __decorate([
+                Something({ v: () => Testing123_1 })
+            ], Testing123);
             exports_1("Testing123", Testing123);
         }
     };

tests/baselines/reference/decoratedClassFromExternalModule.js

@@ -17,14 +17,11 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
     return c > 3 && r && Object.defineProperty(target, key, r), r;
 };
 function decorate(target) { }
-let Decorated = /** @class */ (() => {
-    let Decorated = class Decorated {
-    };
-    Decorated = __decorate([
-        decorate
-    ], Decorated);
-    return Decorated;
-})();
+let Decorated = class Decorated {
+};
+Decorated = __decorate([
+    decorate
+], Decorated);
 export default Decorated;
 //// [undecorated.js]
 export {};

tests/baselines/reference/decoratedDefaultExportsGetExportedAmd.js

@@ -24,14 +24,11 @@ define(["require", "exports"], function (require, exports) {
     "use strict";
     Object.defineProperty(exports, "__esModule", { value: true });
     var decorator;
-    let Foo = /** @class */ (() => {
-        let Foo = class Foo {
-        };
-        Foo = __decorate([
-            decorator
-        ], Foo);
-        return Foo;
-    })();
+    let Foo = class Foo {
+    };
+    Foo = __decorate([
+        decorator
+    ], Foo);
     exports.default = Foo;
 });
 //// [b.js]
@@ -45,13 +42,10 @@ define(["require", "exports"], function (require, exports) {
     "use strict";
     Object.defineProperty(exports, "__esModule", { value: true });
     var decorator;
-    let default_1 = /** @class */ (() => {
-        let default_1 = class {
-        };
-        default_1 = __decorate([
-            decorator
-        ], default_1);
-        return default_1;
-    })();
+    let default_1 = class {
+    };
+    default_1 = __decorate([
+        decorator
+    ], default_1);
     exports.default = default_1;
 });

tests/baselines/reference/decoratedDefaultExportsGetExportedCommonjs.js

@@ -23,14 +23,11 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
 };
 Object.defineProperty(exports, "__esModule", { value: true });
 var decorator;
-let Foo = /** @class */ (() => {
-    let Foo = class Foo {
-    };
-    Foo = __decorate([
-        decorator
-    ], Foo);
-    return Foo;
-})();
+let Foo = class Foo {
+};
+Foo = __decorate([
+    decorator
+], Foo);
 exports.default = Foo;
 //// [b.js]
 "use strict";
@@ -42,12 +39,9 @@ var __decorate = (this && this.__decorate) || function (decorators, target, key,
 };
 Object.defineProperty(exports, "__esModule", { value: true });
 var decorator;
-let default_1 = /** @class */ (() => {
-    let default_1 = class {
-    };
-    default_1 = __decorate([
-        decorator
-    ], default_1);
-    return default_1;
-})();
+let default_1 = class {
+};
+default_1 = __decorate([
+    decorator
+], default_1);
 exports.default = default_1;

tests/baselines/reference/decoratedDefaultExportsGetExportedSystem.js

@@ -26,14 +26,11 @@ System.register([], function (exports_1, context_1) {
     return {
         setters: [],
         execute: function () {
-            Foo = /** @class */ (() => {
-                let Foo = class Foo {
-                };
-                Foo = __decorate([
-                    decorator
-                ], Foo);
-                return Foo;
-            })();
+            Foo = class Foo {
+            };
+            Foo = __decorate([
+                decorator
+            ], Foo);
             exports_1("default", Foo);
         }
     };
@@ -52,14 +49,11 @@ System.register([], function (exports_1, context_1) {
     return {
         setters: [],
         execute: function () {
-            default_1 = /** @class */ (() => {
-                let default_1 = class {
-                };
-                default_1 = __decorate([
-                    decorator
-                ], default_1);
-                return default_1;
-            })();
+            default_1 = class {
+            };
+            default_1 = __decorate([
+                decorator
+            ], default_1);
             exports_1("default", default_1);
         }
     };