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Fix ClassDecoratorContext.name to use literal class name (#62870) #62895

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Fix ClassDecoratorContext.name to use literal class name (#62870) #62895

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4e28fd3
Fix ClassDecoratorContext.name to use literal class name (#62870)
AryanBagade Dec 13, 2025
e2f795d
Merge branch 'main' into fix/62870-class-decorator-context-name
AryanBagade Dec 15, 2025
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7 changes: 5 additions & 2 deletions src/compiler/transformers/esDecorators.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -876,11 +876,14 @@ export function transformESDecorators(context: TransformationContext): (x: Sourc
leadingBlockStatements ??= [];

// produces:
// __esDecorate(null, _classDescriptor = { value: this }, _classDecorators, { kind: "class", name: this.name, metadata }, _classExtraInitializers);
// __esDecorate(null, _classDescriptor = { value: this }, _classDecorators, { kind: "class", name: "C", metadata }, _classExtraInitializers);
const valueProperty = factory.createPropertyAssignment("value", renamedClassThis);
const classDescriptor = factory.createObjectLiteralExpression([valueProperty]);
const classDescriptorAssignment = factory.createAssignment(classInfo.classDescriptorName, classDescriptor);
const classNameReference = factory.createPropertyAccessExpression(renamedClassThis, "name");
// Use the literal class name to avoid triggering a static `name` getter (see #62870)
const classNameReference = node.name
? factory.createStringLiteralFromNode(node.name)
: node.emitNode?.assignedName ?? factory.createStringLiteral("");
const esDecorateHelper = emitHelpers().createESDecorateHelper(
factory.createNull(),
classDescriptorAssignment,
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2 changes: 1 addition & 1 deletion ...selines/reference/esDecorators-classDeclaration-accessors-staticPrivate(target=es2015).js
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Expand Up @@ -55,7 +55,7 @@ let D = (() => {
__setFunctionName(_classThis, "D");
(() => {
const _metadata = typeof Symbol === "function" && Symbol.metadata ? Object.create(null) : void 0;
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: _classThis.name, metadata: _metadata }, null, _classExtraInitializers);
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: "D", metadata: _metadata }, null, _classExtraInitializers);
D = _classThis = _classDescriptor.value;
if (_metadata) Object.defineProperty(_classThis, Symbol.metadata, { enumerable: true, configurable: true, writable: true, value: _metadata });
})();
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2 changes: 1 addition & 1 deletion ...selines/reference/esDecorators-classDeclaration-accessors-staticPrivate(target=es2022).js
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Expand Up @@ -52,7 +52,7 @@ let D = (() => {
static { _D_method1_get = function _D_method1_get() { return 0; }, _D_method1_set = function _D_method1_set(value) { }; }
static {
const _metadata = typeof Symbol === "function" && Symbol.metadata ? Object.create(null) : void 0;
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: _classThis.name, metadata: _metadata }, null, _classExtraInitializers);
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: "D", metadata: _metadata }, null, _classExtraInitializers);
D = _classThis = _classDescriptor.value;
if (_metadata) Object.defineProperty(_classThis, Symbol.metadata, { enumerable: true, configurable: true, writable: true, value: _metadata });
}
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96 changes: 96 additions & 0 deletions ...nce/esDecorators-classDeclaration-classDecoratorContextNameStaticGetter(target=es2022).js
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@@ -0,0 +1,96 @@
//// [tests/cases/conformance/esDecorators/classDeclaration/esDecorators-classDeclaration-classDecoratorContextNameStaticGetter.ts] ////

//// [esDecorators-classDeclaration-classDecoratorContextNameStaticGetter.ts]
// https://github.com/microsoft/TypeScript/issues/62870
// ClassDecoratorContext.name should use the actual class name, not the static name getter

const decorate = (_: unknown, ctx: ClassDecoratorContext) => {
console.log('decorate(%o)', ctx.name);
};

// Named class with static name getter - ctx.name should be "A", not the getter value
@decorate
class A {
static get name() {
return 2434;
}
}

// Named class with static name property - ctx.name should be "B", not the property value
@decorate
class B {
static name = "not B";
}

// Named class without overriding name - ctx.name should be "C"
@decorate
class C {
}


//// [esDecorators-classDeclaration-classDecoratorContextNameStaticGetter.js]
// https://github.com/microsoft/TypeScript/issues/62870
// ClassDecoratorContext.name should use the actual class name, not the static name getter
const decorate = (_, ctx) => {
console.log('decorate(%o)', ctx.name);
};
// Named class with static name getter - ctx.name should be "A", not the getter value
let A = (() => {
let _classDecorators = [decorate];
let _classDescriptor;
let _classExtraInitializers = [];
let _classThis;
var A = class {
static { _classThis = this; }
static {
const _metadata = typeof Symbol === "function" && Symbol.metadata ? Object.create(null) : void 0;
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: "A", metadata: _metadata }, null, _classExtraInitializers);
A = _classThis = _classDescriptor.value;
if (_metadata) Object.defineProperty(_classThis, Symbol.metadata, { enumerable: true, configurable: true, writable: true, value: _metadata });
__runInitializers(_classThis, _classExtraInitializers);
}
static get name() {
return 2434;
}
};
return A = _classThis;
})();
// Named class with static name property - ctx.name should be "B", not the property value
let B = (() => {
let _classDecorators = [decorate];
let _classDescriptor;
let _classExtraInitializers = [];
let _classThis;
var B = class {
static { _classThis = this; }
static {
const _metadata = typeof Symbol === "function" && Symbol.metadata ? Object.create(null) : void 0;
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: "B", metadata: _metadata }, null, _classExtraInitializers);
B = _classThis = _classDescriptor.value;
if (_metadata) Object.defineProperty(_classThis, Symbol.metadata, { enumerable: true, configurable: true, writable: true, value: _metadata });
}
static name = "not B";
static {
__runInitializers(_classThis, _classExtraInitializers);
}
};
return B = _classThis;
})();
// Named class without overriding name - ctx.name should be "C"
let C = (() => {
let _classDecorators = [decorate];
let _classDescriptor;
let _classExtraInitializers = [];
let _classThis;
var C = class {
static { _classThis = this; }
static {
const _metadata = typeof Symbol === "function" && Symbol.metadata ? Object.create(null) : void 0;
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: "C", metadata: _metadata }, null, _classExtraInitializers);
C = _classThis = _classDescriptor.value;
if (_metadata) Object.defineProperty(_classThis, Symbol.metadata, { enumerable: true, configurable: true, writable: true, value: _metadata });
__runInitializers(_classThis, _classExtraInitializers);
}
};
return C = _classThis;
})();
52 changes: 52 additions & 0 deletions ...nce/esDecorators-classDeclaration-classDecoratorContextNameStaticGetter(target=esnext).js
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@@ -0,0 +1,52 @@
//// [tests/cases/conformance/esDecorators/classDeclaration/esDecorators-classDeclaration-classDecoratorContextNameStaticGetter.ts] ////

//// [esDecorators-classDeclaration-classDecoratorContextNameStaticGetter.ts]
// https://github.com/microsoft/TypeScript/issues/62870
// ClassDecoratorContext.name should use the actual class name, not the static name getter

const decorate = (_: unknown, ctx: ClassDecoratorContext) => {
console.log('decorate(%o)', ctx.name);
};

// Named class with static name getter - ctx.name should be "A", not the getter value
@decorate
class A {
static get name() {
return 2434;
}
}

// Named class with static name property - ctx.name should be "B", not the property value
@decorate
class B {
static name = "not B";
}

// Named class without overriding name - ctx.name should be "C"
@decorate
class C {
}


//// [esDecorators-classDeclaration-classDecoratorContextNameStaticGetter.js]
// https://github.com/microsoft/TypeScript/issues/62870
// ClassDecoratorContext.name should use the actual class name, not the static name getter
const decorate = (_, ctx) => {
console.log('decorate(%o)', ctx.name);
};
// Named class with static name getter - ctx.name should be "A", not the getter value
@decorate
class A {
static get name() {
return 2434;
}
}
// Named class with static name property - ctx.name should be "B", not the property value
@decorate
class B {
static name = "not B";
}
// Named class without overriding name - ctx.name should be "C"
@decorate
class C {
}
2 changes: 1 addition & 1 deletion tests/baselines/reference/esDecorators-classDeclaration-classSuper.1.js
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Expand Up @@ -35,7 +35,7 @@ let C = (() => {
static { _classThis = this; }
static {
const _metadata = typeof Symbol === "function" && Symbol.metadata ? Object.create(_classSuper[Symbol.metadata] ?? null) : void 0;
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: _classThis.name, metadata: _metadata }, null, _classExtraInitializers);
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: "C", metadata: _metadata }, null, _classExtraInitializers);
C = _classThis = _classDescriptor.value;
if (_metadata) Object.defineProperty(_classThis, Symbol.metadata, { enumerable: true, configurable: true, writable: true, value: _metadata });
}
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6 changes: 3 additions & 3 deletions tests/baselines/reference/esDecorators-classDeclaration-classSuper.2.js
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Expand Up @@ -41,7 +41,7 @@ let C1 = (() => {
static { _classThis = this; }
static {
const _metadata = typeof Symbol === "function" && Symbol.metadata ? Object.create(_classSuper[Symbol.metadata] ?? null) : void 0;
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: _classThis.name, metadata: _metadata }, null, _classExtraInitializers);
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: "C1", metadata: _metadata }, null, _classExtraInitializers);
C1 = _classThis = _classDescriptor.value;
if (_metadata) Object.defineProperty(_classThis, Symbol.metadata, { enumerable: true, configurable: true, writable: true, value: _metadata });
}
Expand All @@ -65,7 +65,7 @@ let C2 = (() => {
static { _classThis = this; }
static {
const _metadata = typeof Symbol === "function" && Symbol.metadata ? Object.create(_classSuper[Symbol.metadata] ?? null) : void 0;
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: _classThis.name, metadata: _metadata }, null, _classExtraInitializers);
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: "C2", metadata: _metadata }, null, _classExtraInitializers);
C2 = _classThis = _classDescriptor.value;
if (_metadata) Object.defineProperty(_classThis, Symbol.metadata, { enumerable: true, configurable: true, writable: true, value: _metadata });
}
Expand All @@ -89,7 +89,7 @@ let C3 = (() => {
static { _classThis = this; }
static {
const _metadata = typeof Symbol === "function" && Symbol.metadata ? Object.create(_classSuper[Symbol.metadata] ?? null) : void 0;
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: _classThis.name, metadata: _metadata }, null, _classExtraInitializers);
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: "C3", metadata: _metadata }, null, _classExtraInitializers);
C3 = _classThis = _classDescriptor.value;
if (_metadata) Object.defineProperty(_classThis, Symbol.metadata, { enumerable: true, configurable: true, writable: true, value: _metadata });
}
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2 changes: 1 addition & 1 deletion tests/baselines/reference/esDecorators-classDeclaration-classSuper.3.js
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Expand Up @@ -57,7 +57,7 @@ let C = (() => {
static { _classThis = this; }
static {
const _metadata = typeof Symbol === "function" && Symbol.metadata ? Object.create(_classSuper[Symbol.metadata] ?? null) : void 0;
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: _classThis.name, metadata: _metadata }, null, _classExtraInitializers);
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: "C", metadata: _metadata }, null, _classExtraInitializers);
C = _classThis = _classDescriptor.value;
if (_metadata) Object.defineProperty(_classThis, Symbol.metadata, { enumerable: true, configurable: true, writable: true, value: _metadata });
}
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2 changes: 1 addition & 1 deletion tests/baselines/reference/esDecorators-classDeclaration-classSuper.4.js
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Expand Up @@ -32,7 +32,7 @@ let C = (() => {
static { _classThis = this; }
static {
const _metadata = typeof Symbol === "function" && Symbol.metadata ? Object.create(_classSuper[Symbol.metadata] ?? null) : void 0;
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: _classThis.name, metadata: _metadata }, null, _classExtraInitializers);
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: "C", metadata: _metadata }, null, _classExtraInitializers);
C = _classThis = _classDescriptor.value;
if (_metadata) Object.defineProperty(_classThis, Symbol.metadata, { enumerable: true, configurable: true, writable: true, value: _metadata });
}
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6 changes: 3 additions & 3 deletions tests/baselines/reference/esDecorators-classDeclaration-classSuper.5.js
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Expand Up @@ -61,7 +61,7 @@ let C1 = (() => {
static { _classThis = this; }
static {
const _metadata = typeof Symbol === "function" && Symbol.metadata ? Object.create(_classSuper[Symbol.metadata] ?? null) : void 0;
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: _classThis.name, metadata: _metadata }, null, _classExtraInitializers);
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: "C1", metadata: _metadata }, null, _classExtraInitializers);
C1 = _classThis = _classDescriptor.value;
if (_metadata) Object.defineProperty(_classThis, Symbol.metadata, { enumerable: true, configurable: true, writable: true, value: _metadata });
}
Expand Down Expand Up @@ -108,7 +108,7 @@ let C2 = (() => {
static { _classThis = this; }
static {
const _metadata = typeof Symbol === "function" && Symbol.metadata ? Object.create(_classSuper[Symbol.metadata] ?? null) : void 0;
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: _classThis.name, metadata: _metadata }, null, _classExtraInitializers);
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: "C2", metadata: _metadata }, null, _classExtraInitializers);
C2 = _classThis = _classDescriptor.value;
if (_metadata) Object.defineProperty(_classThis, Symbol.metadata, { enumerable: true, configurable: true, writable: true, value: _metadata });
}
Expand Down Expand Up @@ -155,7 +155,7 @@ let C3 = (() => {
static { _classThis = this; }
static {
const _metadata = typeof Symbol === "function" && Symbol.metadata ? Object.create(_classSuper[Symbol.metadata] ?? null) : void 0;
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: _classThis.name, metadata: _metadata }, null, _classExtraInitializers);
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: "C3", metadata: _metadata }, null, _classExtraInitializers);
C3 = _classThis = _classDescriptor.value;
if (_metadata) Object.defineProperty(_classThis, Symbol.metadata, { enumerable: true, configurable: true, writable: true, value: _metadata });
}
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2 changes: 1 addition & 1 deletion tests/baselines/reference/esDecorators-classDeclaration-classSuper.6.js
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Expand Up @@ -39,7 +39,7 @@ let C = (() => {
static { _classThis = this; }
static {
const _metadata = typeof Symbol === "function" && Symbol.metadata ? Object.create(_classSuper[Symbol.metadata] ?? null) : void 0;
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: _classThis.name, metadata: _metadata }, null, _classExtraInitializers);
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: "C", metadata: _metadata }, null, _classExtraInitializers);
C = _classThis = _classDescriptor.value;
if (_metadata) Object.defineProperty(_classThis, Symbol.metadata, { enumerable: true, configurable: true, writable: true, value: _metadata });
__runInitializers(_classThis, _classExtraInitializers);
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2 changes: 1 addition & 1 deletion tests/baselines/reference/esDecorators-classDeclaration-classThisReference(target=es2015).js
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Expand Up @@ -29,7 +29,7 @@ let C = (() => {
__setFunctionName(_classThis, "C");
(() => {
const _metadata = typeof Symbol === "function" && Symbol.metadata ? Object.create(null) : void 0;
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: _classThis.name, metadata: _metadata }, null, _classExtraInitializers);
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: "C", metadata: _metadata }, null, _classExtraInitializers);
C = _classThis = _classDescriptor.value;
if (_metadata) Object.defineProperty(_classThis, Symbol.metadata, { enumerable: true, configurable: true, writable: true, value: _metadata });
})();
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2 changes: 1 addition & 1 deletion tests/baselines/reference/esDecorators-classDeclaration-classThisReference(target=es2022).js
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Expand Up @@ -25,7 +25,7 @@ let C = (() => {
static { __setFunctionName(this, "C"); }
static {
const _metadata = typeof Symbol === "function" && Symbol.metadata ? Object.create(null) : void 0;
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: _classThis.name, metadata: _metadata }, null, _classExtraInitializers);
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: "C", metadata: _metadata }, null, _classExtraInitializers);
C = _classThis = _classDescriptor.value;
if (_metadata) Object.defineProperty(_classThis, Symbol.metadata, { enumerable: true, configurable: true, writable: true, value: _metadata });
}
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2 changes: 1 addition & 1 deletion tests/baselines/reference/esDecorators-classDeclaration-classThisReference.es5.js
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Expand Up @@ -32,7 +32,7 @@ var C = function () {
__setFunctionName(_classThis, "C");
(function () {
var _metadata = typeof Symbol === "function" && Symbol.metadata ? Object.create(null) : void 0;
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: _classThis.name, metadata: _metadata }, null, _classExtraInitializers);
__esDecorate(null, _classDescriptor = { value: _classThis }, _classDecorators, { kind: "class", name: "C", metadata: _metadata }, null, _classExtraInitializers);
C = _classThis = _classDescriptor.value;
if (_metadata) Object.defineProperty(_classThis, Symbol.metadata, { enumerable: true, configurable: true, writable: true, value: _metadata });
})();
Expand Down
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