🤖 Pick PR #53547 (Fix double-emit in constructor) into release-5.0 (#53550)

Co-authored-by: Ron Buckton <ron.buckton@microsoft.com>

Author: TypeScript Bot

src/compiler/transformers/esDecorators.ts

@@ -1074,10 +1074,15 @@ export function transformESDecorators(context: TransformationContext): (x: Sourc
                 const statements: Statement[] = [];
                 const nonPrologueStart = factory.copyPrologue(node.body.statements, statements, /*ensureUseStrict*/ false, visitor);
                 const superStatementIndex = findSuperStatementIndex(node.body.statements, nonPrologueStart);
-                const indexOfFirstStatementAfterSuper = superStatementIndex >= 0 ? superStatementIndex + 1 : undefined;
-                addRange(statements, visitNodes(node.body.statements, visitor, isStatement, nonPrologueStart, indexOfFirstStatementAfterSuper ? indexOfFirstStatementAfterSuper - nonPrologueStart : undefined));
-                addRange(statements, initializerStatements);
-                addRange(statements, visitNodes(node.body.statements, visitor, isStatement, indexOfFirstStatementAfterSuper));
+                if (superStatementIndex >= 0) {
+                    addRange(statements, visitNodes(node.body.statements, visitor, isStatement, nonPrologueStart, superStatementIndex + 1 - nonPrologueStart));
+                    addRange(statements, initializerStatements);
+                    addRange(statements, visitNodes(node.body.statements, visitor, isStatement, superStatementIndex + 1));
+                }
+                else {
+                    addRange(statements, initializerStatements);
+                    addRange(statements, visitNodes(node.body.statements, visitor, isStatement));
+                }
                 body = factory.createBlock(statements, /*multiLine*/ true);
                 setOriginalNode(body, node.body);
                 setTextRange(body, node.body);

tests/baselines/reference/esDecorators-classDeclaration-classSuper.7.js

@@ -0,0 +1,101 @@
+//// [esDecorators-classDeclaration-classSuper.7.ts]
+class A {}
+class B extends A {
+	public constructor() {
+		'inject';
+		super();
+		const a = 1;
+		const b = 1;
+	}
+
+	@foo
+	public m(): void {}
+}
+
+function foo(method: any, _context: any): any {
+	return function (this: any) {
+		method.call(this);
+	};
+}
+
+new B();
+
+// https://github.com/microsoft/TypeScript/issues/53448
+class C {
+	public constructor() {
+		this.val;
+	}
+
+	@foo
+	public get val(): number { return 3; }
+}
+class D extends A {
+	public constructor() {
+		super();
+		this.val;
+	}
+
+	@foo
+	public get val(): number { return 3; }
+}
+
+
+//// [esDecorators-classDeclaration-classSuper.7.js]
+class A {
+}
+let B = (() => {
+    let _instanceExtraInitializers = [];
+    let _m_decorators;
+    return class B extends A {
+        static {
+            _m_decorators = [foo];
+            __esDecorate(this, null, _m_decorators, { kind: "method", name: "m", static: false, private: false, access: { has: obj => "m" in obj, get: obj => obj.m } }, null, _instanceExtraInitializers);
+        }
+        constructor() {
+            'inject';
+            super();
+            __runInitializers(this, _instanceExtraInitializers);
+            const a = 1;
+            const b = 1;
+        }
+        m() { }
+    };
+})();
+function foo(method, _context) {
+    return function () {
+        method.call(this);
+    };
+}
+new B();
+// https://github.com/microsoft/TypeScript/issues/53448
+let C = (() => {
+    let _instanceExtraInitializers_1 = [];
+    let _get_val_decorators;
+    return class C {
+        static {
+            _get_val_decorators = [foo];
+            __esDecorate(this, null, _get_val_decorators, { kind: "getter", name: "val", static: false, private: false, access: { has: obj => "val" in obj, get: obj => obj.val } }, null, _instanceExtraInitializers_1);
+        }
+        constructor() {
+            __runInitializers(this, _instanceExtraInitializers_1);
+            this.val;
+        }
+        get val() { return 3; }
+    };
+})();
+let D = (() => {
+    let _instanceExtraInitializers_2 = [];
+    let _get_val_decorators;
+    return class D extends A {
+        static {
+            _get_val_decorators = [foo];
+            __esDecorate(this, null, _get_val_decorators, { kind: "getter", name: "val", static: false, private: false, access: { has: obj => "val" in obj, get: obj => obj.val } }, null, _instanceExtraInitializers_2);
+        }
+        constructor() {
+            super();
+            __runInitializers(this, _instanceExtraInitializers_2);
+            this.val;
+        }
+        get val() { return 3; }
+    };
+})();

tests/baselines/reference/esDecorators-classExpression-classSuper.7.js

@@ -22,3 +22,22 @@ function foo(method: any, _context: any): any {
 }
 
 new B();
+
+// https://github.com/microsoft/TypeScript/issues/53448
+class C {
+	public constructor() {
+		this.val;
+	}
+
+	@foo
+	public get val(): number { return 3; }
+}
+class D extends A {
+	public constructor() {
+		super();
+		this.val;
+	}
+
+	@foo
+	public get val(): number { return 3; }
+}