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Emit Symbol.toStringTag properties in TS 6.0 #2193

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Emit Symbol.toStringTag properties in TS 6.0 #2193

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ccd4e74
emit `Symbol.toStringTag` properties
Renegade334 Oct 7, 2025
28dd4e8
emit non-literal `Symbol.toStringTag` properties for parent interfaces
Renegade334 Oct 8, 2025
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45 changes: 45 additions & 0 deletions baselines/audioworklet.generated.d.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -199,6 +199,7 @@ interface AbortController {
* [MDN Reference](https://developer.mozilla.org/docs/Web/API/AbortController/abort)
*/
abort(reason?: any): void;
readonly [Symbol.toStringTag]: "AbortController";
}

declare var AbortController: {
Expand Down Expand Up @@ -240,6 +241,7 @@ interface AbortSignal extends EventTarget {
addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
removeEventListener<K extends keyof AbortSignalEventMap>(type: K, listener: (this: AbortSignal, ev: AbortSignalEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
readonly [Symbol.toStringTag]: "AbortSignal";
}

declare var AbortSignal: {
Expand Down Expand Up @@ -289,6 +291,7 @@ interface AudioWorkletGlobalScope extends WorkletGlobalScope {
* [MDN Reference](https://developer.mozilla.org/docs/Web/API/AudioWorkletGlobalScope/registerProcessor)
*/
registerProcessor(name: string, processorCtor: AudioWorkletProcessorConstructor): void;
readonly [Symbol.toStringTag]: "AudioWorkletGlobalScope";
}

declare var AudioWorkletGlobalScope: {
Expand All @@ -308,6 +311,7 @@ interface AudioWorkletProcessor {
* [MDN Reference](https://developer.mozilla.org/docs/Web/API/AudioWorkletProcessor/port)
*/
readonly port: MessagePort;
readonly [Symbol.toStringTag]: string;
}

declare var AudioWorkletProcessor: {
Expand All @@ -333,6 +337,7 @@ interface ByteLengthQueuingStrategy extends QueuingStrategy<ArrayBufferView> {
readonly highWaterMark: number;
/** [MDN Reference](https://developer.mozilla.org/docs/Web/API/ByteLengthQueuingStrategy/size) */
readonly size: QueuingStrategySize<ArrayBufferView>;
readonly [Symbol.toStringTag]: "ByteLengthQueuingStrategy";
}

declare var ByteLengthQueuingStrategy: {
Expand All @@ -348,6 +353,7 @@ declare var ByteLengthQueuingStrategy: {
interface CompressionStream extends GenericTransformStream {
readonly readable: ReadableStream<Uint8Array<ArrayBuffer>>;
readonly writable: WritableStream<BufferSource>;
readonly [Symbol.toStringTag]: "CompressionStream";
}

declare var CompressionStream: {
Expand All @@ -369,6 +375,7 @@ interface CountQueuingStrategy extends QueuingStrategy {
readonly highWaterMark: number;
/** [MDN Reference](https://developer.mozilla.org/docs/Web/API/CountQueuingStrategy/size) */
readonly size: QueuingStrategySize;
readonly [Symbol.toStringTag]: "CountQueuingStrategy";
}

declare var CountQueuingStrategy: {
Expand All @@ -395,6 +402,7 @@ interface CustomEvent<T = any> extends Event {
* [MDN Reference](https://developer.mozilla.org/docs/Web/API/CustomEvent/initCustomEvent)
*/
initCustomEvent(type: string, bubbles?: boolean, cancelable?: boolean, detail?: T): void;
readonly [Symbol.toStringTag]: "CustomEvent";
}

declare var CustomEvent: {
Expand Down Expand Up @@ -492,6 +500,7 @@ declare var DOMException: {
interface DecompressionStream extends GenericTransformStream {
readonly readable: ReadableStream<Uint8Array<ArrayBuffer>>;
readonly writable: WritableStream<BufferSource>;
readonly [Symbol.toStringTag]: "DecompressionStream";
}

declare var DecompressionStream: {
Expand Down Expand Up @@ -535,6 +544,7 @@ interface ErrorEvent extends Event {
* [MDN Reference](https://developer.mozilla.org/docs/Web/API/ErrorEvent/message)
*/
readonly message: string;
readonly [Symbol.toStringTag]: "ErrorEvent";
}

declare var ErrorEvent: {
Expand Down Expand Up @@ -664,6 +674,7 @@ interface Event {
readonly CAPTURING_PHASE: 1;
readonly AT_TARGET: 2;
readonly BUBBLING_PHASE: 3;
readonly [Symbol.toStringTag]: string;
}

declare var Event: {
Expand Down Expand Up @@ -707,6 +718,7 @@ interface EventTarget {
* [MDN Reference](https://developer.mozilla.org/docs/Web/API/EventTarget/removeEventListener)
*/
removeEventListener(type: string, callback: EventListenerOrEventListenerObject | null, options?: EventListenerOptions | boolean): void;
readonly [Symbol.toStringTag]: string;
}

declare var EventTarget: {
Expand Down Expand Up @@ -759,6 +771,7 @@ interface MessageEvent<T = any> extends Event {
readonly source: MessageEventSource | null;
/** @deprecated */
initMessageEvent(type: string, bubbles?: boolean, cancelable?: boolean, data?: any, origin?: string, lastEventId?: string, source?: MessageEventSource | null, ports?: MessagePort[]): void;
readonly [Symbol.toStringTag]: "MessageEvent";
}

declare var MessageEvent: {
Expand Down Expand Up @@ -816,6 +829,7 @@ interface MessagePort extends EventTarget, MessageEventTarget<MessagePort> {
addEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | AddEventListenerOptions): void;
removeEventListener<K extends keyof MessagePortEventMap>(type: K, listener: (this: MessagePort, ev: MessagePortEventMap[K]) => any, options?: boolean | EventListenerOptions): void;
removeEventListener(type: string, listener: EventListenerOrEventListenerObject, options?: boolean | EventListenerOptions): void;
readonly [Symbol.toStringTag]: "MessagePort";
}

declare var MessagePort: {
Expand All @@ -841,6 +855,7 @@ interface PromiseRejectionEvent extends Event {
* [MDN Reference](https://developer.mozilla.org/docs/Web/API/PromiseRejectionEvent/reason)
*/
readonly reason: any;
readonly [Symbol.toStringTag]: "PromiseRejectionEvent";
}

declare var PromiseRejectionEvent: {
Expand Down Expand Up @@ -884,6 +899,7 @@ interface ReadableByteStreamController {
* [MDN Reference](https://developer.mozilla.org/docs/Web/API/ReadableByteStreamController/error)
*/
error(e?: any): void;
readonly [Symbol.toStringTag]: "ReadableByteStreamController";
}

declare var ReadableByteStreamController: {
Expand Down Expand Up @@ -935,6 +951,7 @@ interface ReadableStream<R = any> {
* [MDN Reference](https://developer.mozilla.org/docs/Web/API/ReadableStream/tee)
*/
tee(): [ReadableStream<R>, ReadableStream<R>];
readonly [Symbol.toStringTag]: "ReadableStream";
}

declare var ReadableStream: {
Expand Down Expand Up @@ -962,6 +979,7 @@ interface ReadableStreamBYOBReader extends ReadableStreamGenericReader {
* [MDN Reference](https://developer.mozilla.org/docs/Web/API/ReadableStreamBYOBReader/releaseLock)
*/
releaseLock(): void;
readonly [Symbol.toStringTag]: "ReadableStreamBYOBReader";
}

declare var ReadableStreamBYOBReader: {
Expand Down Expand Up @@ -993,6 +1011,7 @@ interface ReadableStreamBYOBRequest {
* [MDN Reference](https://developer.mozilla.org/docs/Web/API/ReadableStreamBYOBRequest/respondWithNewView)
*/
respondWithNewView(view: ArrayBufferView<ArrayBuffer>): void;
readonly [Symbol.toStringTag]: "ReadableStreamBYOBRequest";
}

declare var ReadableStreamBYOBRequest: {
Expand Down Expand Up @@ -1030,6 +1049,7 @@ interface ReadableStreamDefaultController<R = any> {
* [MDN Reference](https://developer.mozilla.org/docs/Web/API/ReadableStreamDefaultController/error)
*/
error(e?: any): void;
readonly [Symbol.toStringTag]: "ReadableStreamDefaultController";
}

declare var ReadableStreamDefaultController: {
Expand All @@ -1055,6 +1075,7 @@ interface ReadableStreamDefaultReader<R = any> extends ReadableStreamGenericRead
* [MDN Reference](https://developer.mozilla.org/docs/Web/API/ReadableStreamDefaultReader/releaseLock)
*/
releaseLock(): void;
readonly [Symbol.toStringTag]: "ReadableStreamDefaultReader";
}

declare var ReadableStreamDefaultReader: {
Expand All @@ -1081,6 +1102,7 @@ interface TextDecoder extends TextDecoderCommon {
* [MDN Reference](https://developer.mozilla.org/docs/Web/API/TextDecoder/decode)
*/
decode(input?: AllowSharedBufferSource, options?: TextDecodeOptions): string;
readonly [Symbol.toStringTag]: "TextDecoder";
}

declare var TextDecoder: {
Expand Down Expand Up @@ -1117,6 +1139,7 @@ interface TextDecoderCommon {
interface TextDecoderStream extends GenericTransformStream, TextDecoderCommon {
readonly readable: ReadableStream<string>;
readonly writable: WritableStream<BufferSource>;
readonly [Symbol.toStringTag]: "TextDecoderStream";
}

declare var TextDecoderStream: {
Expand All @@ -1142,6 +1165,7 @@ interface TextEncoder extends TextEncoderCommon {
* [MDN Reference](https://developer.mozilla.org/docs/Web/API/TextEncoder/encodeInto)
*/
encodeInto(source: string, destination: Uint8Array<ArrayBufferLike>): TextEncoderEncodeIntoResult;
readonly [Symbol.toStringTag]: "TextEncoder";
}

declare var TextEncoder: {
Expand All @@ -1166,6 +1190,7 @@ interface TextEncoderCommon {
interface TextEncoderStream extends GenericTransformStream, TextEncoderCommon {
readonly readable: ReadableStream<Uint8Array<ArrayBuffer>>;
readonly writable: WritableStream<string>;
readonly [Symbol.toStringTag]: "TextEncoderStream";
}

declare var TextEncoderStream: {
Expand All @@ -1191,6 +1216,7 @@ interface TransformStream<I = any, O = any> {
* [MDN Reference](https://developer.mozilla.org/docs/Web/API/TransformStream/writable)
*/
readonly writable: WritableStream<I>;
readonly [Symbol.toStringTag]: "TransformStream";
}

declare var TransformStream: {
Expand Down Expand Up @@ -1228,6 +1254,7 @@ interface TransformStreamDefaultController<O = any> {
* [MDN Reference](https://developer.mozilla.org/docs/Web/API/TransformStreamDefaultController/terminate)
*/
terminate(): void;
readonly [Symbol.toStringTag]: "TransformStreamDefaultController";
}

declare var TransformStreamDefaultController: {
Expand Down Expand Up @@ -1320,6 +1347,7 @@ interface URL {
* [MDN Reference](https://developer.mozilla.org/docs/Web/API/URL/toJSON)
*/
toJSON(): string;
readonly [Symbol.toStringTag]: "URL";
}

declare var URL: {
Expand Down Expand Up @@ -1395,6 +1423,7 @@ interface URLSearchParams {
sort(): void;
toString(): string;
forEach(callbackfn: (value: string, key: string, parent: URLSearchParams) => void, thisArg?: any): void;
readonly [Symbol.toStringTag]: "URLSearchParams";
}

declare var URLSearchParams: {
Expand All @@ -1409,6 +1438,7 @@ declare var URLSearchParams: {
* [MDN Reference](https://developer.mozilla.org/docs/Web/API/WorkletGlobalScope)
*/
interface WorkletGlobalScope {
readonly [Symbol.toStringTag]: string;
}

declare var WorkletGlobalScope: {
Expand Down Expand Up @@ -1446,6 +1476,7 @@ interface WritableStream<W = any> {
* [MDN Reference](https://developer.mozilla.org/docs/Web/API/WritableStream/getWriter)
*/
getWriter(): WritableStreamDefaultWriter<W>;
readonly [Symbol.toStringTag]: "WritableStream";
}

declare var WritableStream: {
Expand All @@ -1471,6 +1502,7 @@ interface WritableStreamDefaultController {
* [MDN Reference](https://developer.mozilla.org/docs/Web/API/WritableStreamDefaultController/error)
*/
error(e?: any): void;
readonly [Symbol.toStringTag]: "WritableStreamDefaultController";
}

declare var WritableStreamDefaultController: {
Expand Down Expand Up @@ -1526,6 +1558,7 @@ interface WritableStreamDefaultWriter<W = any> {
* [MDN Reference](https://developer.mozilla.org/docs/Web/API/WritableStreamDefaultWriter/write)
*/
write(chunk?: W): Promise<void>;
readonly [Symbol.toStringTag]: "WritableStreamDefaultWriter";
}

declare var WritableStreamDefaultWriter: {
Expand All @@ -1535,6 +1568,7 @@ declare var WritableStreamDefaultWriter: {

declare namespace WebAssembly {
interface CompileError extends Error {
readonly [Symbol.toStringTag]: "WebAssembly.CompileError";
}

var CompileError: {
Expand Down Expand Up @@ -1567,6 +1601,7 @@ declare namespace WebAssembly {
* [MDN Reference](https://developer.mozilla.org/docs/WebAssembly/Reference/JavaScript_interface/Exception/is)
*/
is(exceptionTag: Tag): boolean;
readonly [Symbol.toStringTag]: "WebAssembly.Exception";
}

var Exception: {
Expand All @@ -1582,6 +1617,7 @@ declare namespace WebAssembly {
interface Global<T extends ValueType = ValueType> {
value: ValueTypeMap[T];
valueOf(): ValueTypeMap[T];
readonly [Symbol.toStringTag]: "WebAssembly.Global";
}

var Global: {
Expand All @@ -1601,6 +1637,7 @@ declare namespace WebAssembly {
* [MDN Reference](https://developer.mozilla.org/docs/WebAssembly/Reference/JavaScript_interface/Instance/exports)
*/
readonly exports: Exports;
readonly [Symbol.toStringTag]: "WebAssembly.Instance";
}

var Instance: {
Expand All @@ -1609,6 +1646,7 @@ declare namespace WebAssembly {
};

interface LinkError extends Error {
readonly [Symbol.toStringTag]: "WebAssembly.LinkError";
}

var LinkError: {
Expand All @@ -1635,6 +1673,7 @@ declare namespace WebAssembly {
* [MDN Reference](https://developer.mozilla.org/docs/WebAssembly/Reference/JavaScript_interface/Memory/grow)
*/
grow(delta: AddressValue): AddressValue;
readonly [Symbol.toStringTag]: "WebAssembly.Memory";
}

var Memory: {
Expand All @@ -1648,6 +1687,7 @@ declare namespace WebAssembly {
* [MDN Reference](https://developer.mozilla.org/docs/WebAssembly/Reference/JavaScript_interface/Module)
*/
interface Module {
readonly [Symbol.toStringTag]: "WebAssembly.Module";
}

var Module: {
Expand All @@ -1674,6 +1714,7 @@ declare namespace WebAssembly {
};

interface RuntimeError extends Error {
readonly [Symbol.toStringTag]: "WebAssembly.RuntimeError";
}

var RuntimeError: {
Expand Down Expand Up @@ -1712,6 +1753,7 @@ declare namespace WebAssembly {
* [MDN Reference](https://developer.mozilla.org/docs/WebAssembly/Reference/JavaScript_interface/Table/set)
*/
set(index: AddressValue, value?: any): void;
readonly [Symbol.toStringTag]: "WebAssembly.Table";
}

var Table: {
Expand All @@ -1725,6 +1767,7 @@ declare namespace WebAssembly {
* [MDN Reference](https://developer.mozilla.org/docs/WebAssembly/Reference/JavaScript_interface/Tag)
*/
interface Tag {
readonly [Symbol.toStringTag]: "WebAssembly.Tag";
}

var Tag: {
Expand Down Expand Up @@ -2033,6 +2076,7 @@ interface MessageEvent<T = any> {

interface URLSearchParamsIterator<T> extends IteratorObject<T, BuiltinIteratorReturn, unknown> {
[Symbol.iterator](): URLSearchParamsIterator<T>;
readonly [Symbol.toStringTag]: "URLSearchParams Iterator";
}

interface URLSearchParams {
Expand All @@ -2052,6 +2096,7 @@ interface URLSearchParams {

interface ReadableStreamAsyncIterator<T> extends AsyncIteratorObject<T, BuiltinIteratorReturn, unknown> {
[Symbol.asyncIterator](): ReadableStreamAsyncIterator<T>;
readonly [Symbol.toStringTag]: "ReadableStream AsyncIterator";
}

interface ReadableStream<R = any> {
Expand Down
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