Update 2025-12-10

Author: jakebailey

src/lib/dom.generated.d.ts

@@ -1088,8 +1088,8 @@ interface WebTransportErrorOptions {
 }
 
 interface WebTransportHash {
-    algorithm?: string;
-    value?: BufferSource;
+    algorithm: string;
+    value: BufferSource;
 }
 
 interface WebTransportOptions {
@@ -2665,14 +2665,14 @@ declare var CloseEvent: {
 };
 
 /**
- * The **`CompressionStream`** interface of the Compression Streams API is an API for compressing a stream of data.
+ * The **`CompressionStream`** interface of the Compression Streams API compresses a stream of data. It implements the same shape as a TransformStream, allowing it to be used in ReadableStream.pipeThrough() and similar methods.
  *
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/CompressionStream)
  */
 interface CompressionStream extends GenericTransformStream {
-    /** The **`readable`** read-only property of the CompressionStream interface returns a ReadableStream. */
+    /** The **`readable`** read-only property of the CompressionStream interface returns a ReadableStream that emits compressed data as Uint8Array chunks. */
     readonly readable: ReadableStream<Uint8Array<ArrayBuffer>>;
-    /** The **`writable`** read-only property of the CompressionStream interface returns a WritableStream. */
+    /** The **`writable`** read-only property of the CompressionStream interface returns a WritableStream that accepts uncompressed data to be compressed, in the form of ArrayBuffer, TypedArray, or DataView chunks. */
     readonly writable: WritableStream<BufferSource>;
 }
 
@@ -3589,14 +3589,14 @@ declare var DOMStringList: {
 };
 
 /**
- * The **`DecompressionStream`** interface of the Compression Streams API is an API for decompressing a stream of data.
+ * The **`DecompressionStream`** interface of the Compression Streams API decompresses a stream of data. It implements the same shape as a TransformStream, allowing it to be used in ReadableStream.pipeThrough() and similar methods.
  *
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/DecompressionStream)
  */
 interface DecompressionStream extends GenericTransformStream {
-    /** The **`readable`** read-only property of the DecompressionStream interface returns a ReadableStream. */
+    /** The **`readable`** read-only property of the DecompressionStream interface returns a ReadableStream that emits decompressed data as Uint8Array chunks. */
     readonly readable: ReadableStream<Uint8Array<ArrayBuffer>>;
-    /** The **`writable`** read-only property of the DecompressionStream interface returns a WritableStream. */
+    /** The **`writable`** read-only property of the DecompressionStream interface returns a WritableStream that accepts compressed data to be decompressed, in the form of ArrayBuffer, TypedArray, or DataView chunks. */
     readonly writable: WritableStream<BufferSource>;
 }
 
@@ -7181,7 +7181,7 @@ interface PushMessageData {
      */
     blob(): Blob;
     /**
-     * The **`bytes()`** method of the PushMessageData interface extracts push message data as an Uint8Array object.
+     * The **`bytes()`** method of the PushMessageData interface extracts push message data as a Uint8Array object.
      *
      * [MDN Reference](https://developer.mozilla.org/docs/Web/API/PushMessageData/bytes)
      */
@@ -7465,7 +7465,7 @@ interface RTCEncodedVideoFrame {
      *
      * [MDN Reference](https://developer.mozilla.org/docs/Web/API/RTCEncodedVideoFrame/type)
      */
-    readonly type: RTCEncodedVideoFrameType;
+    readonly type: EncodedVideoChunkType;
     /**
      * The **`getMetadata()`** method of the RTCEncodedVideoFrame interface returns an object containing the metadata associated with the frame.
      *
@@ -8670,14 +8670,14 @@ interface TextDecoderCommon {
 }
 
 /**
- * The **`TextDecoderStream`** interface of the Encoding API converts a stream of text in a binary encoding, such as UTF-8 etc., to a stream of strings. It is the streaming equivalent of TextDecoder.
+ * The **`TextDecoderStream`** interface of the Encoding API converts a stream of text in a binary encoding, such as UTF-8 etc., to a stream of strings. It is the streaming equivalent of TextDecoder. It implements the same shape as a TransformStream, allowing it to be used in ReadableStream.pipeThrough() and similar methods.
  *
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/TextDecoderStream)
  */
 interface TextDecoderStream extends GenericTransformStream, TextDecoderCommon {
-    /** The **`readable`** read-only property of the TextDecoderStream interface returns a ReadableStream. */
+    /** The **`readable`** read-only property of the TextDecoderStream interface returns a ReadableStream that emits decoded strings. */
     readonly readable: ReadableStream<string>;
-    /** The **`writable`** read-only property of the TextDecoderStream interface returns a WritableStream. */
+    /** The **`writable`** read-only property of the TextDecoderStream interface returns a WritableStream that accepts binary data, in the form of ArrayBuffer, TypedArray, or DataView chunks (SharedArrayBuffer and its views are also allowed), to be decoded into strings. */
     readonly writable: WritableStream<BufferSource>;
 }
 
@@ -8721,14 +8721,14 @@ interface TextEncoderCommon {
 }
 
 /**
- * The **`TextEncoderStream`** interface of the Encoding API converts a stream of strings into bytes in the UTF-8 encoding. It is the streaming equivalent of TextEncoder.
+ * The **`TextEncoderStream`** interface of the Encoding API converts a stream of strings into bytes in the UTF-8 encoding. It is the streaming equivalent of TextEncoder. It implements the same shape as a TransformStream, allowing it to be used in ReadableStream.pipeThrough() and similar methods.
  *
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/TextEncoderStream)
  */
 interface TextEncoderStream extends GenericTransformStream, TextEncoderCommon {
-    /** The **`readable`** read-only property of the TextEncoderStream interface returns a ReadableStream. */
+    /** The **`readable`** read-only property of the TextEncoderStream interface returns a ReadableStream that emits encoded binary data as Uint8Array chunks. */
     readonly readable: ReadableStream<Uint8Array<ArrayBuffer>>;
-    /** The **`writable`** read-only property of the TextEncoderStream interface returns a WritableStream. */
+    /** The **`writable`** read-only property of the TextEncoderStream interface returns a WritableStream that accepts strings to be encoded into binary data. */
     readonly writable: WritableStream<string>;
 }
 
@@ -8829,13 +8829,13 @@ declare var TextMetrics: {
  */
 interface TransformStream<I = any, O = any> {
     /**
-     * The **`readable`** read-only property of the TransformStream interface returns the ReadableStream instance controlled by this TransformStream.
+     * The **`readable`** read-only property of the TransformStream interface returns the ReadableStream instance controlled by this TransformStream. This stream emits the transformed output data.
      *
      * [MDN Reference](https://developer.mozilla.org/docs/Web/API/TransformStream/readable)
      */
     readonly readable: ReadableStream<O>;
     /**
-     * The **`writable`** read-only property of the TransformStream interface returns the WritableStream instance controlled by this TransformStream.
+     * The **`writable`** read-only property of the TransformStream interface returns the WritableStream instance controlled by this TransformStream. This stream accepts input data that will be transformed and emitted to the readable stream.
      *
      * [MDN Reference](https://developer.mozilla.org/docs/Web/API/TransformStream/writable)
      */
@@ -11300,6 +11300,7 @@ interface WebGLRenderingContextBase {
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLRenderingContext/getError) */
     getError(): GLenum;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLRenderingContext/getExtension) */
+    getExtension(name: string): any;
     getExtension(extensionName: "ANGLE_instanced_arrays"): ANGLE_instanced_arrays | null;
     getExtension(extensionName: "EXT_blend_minmax"): EXT_blend_minmax | null;
     getExtension(extensionName: "EXT_color_buffer_float"): EXT_color_buffer_float | null;
@@ -11334,7 +11335,6 @@ interface WebGLRenderingContextBase {
     getExtension(extensionName: "WEBGL_draw_buffers"): WEBGL_draw_buffers | null;
     getExtension(extensionName: "WEBGL_lose_context"): WEBGL_lose_context | null;
     getExtension(extensionName: "WEBGL_multi_draw"): WEBGL_multi_draw | null;
-    getExtension(name: string): any;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLRenderingContext/getFramebufferAttachmentParameter) */
     getFramebufferAttachmentParameter(target: GLenum, attachment: GLenum, pname: GLenum): any;
     /** [MDN Reference](https://developer.mozilla.org/docs/Web/API/WebGLRenderingContext/getParameter) */
@@ -12312,7 +12312,7 @@ interface WorkerGlobalScopeEventMap {
  */
 interface WorkerGlobalScope extends EventTarget, FontFaceSource, WindowOrWorkerGlobalScope {
     /**
-     * The **`location`** read-only property of the WorkerGlobalScope interface returns the WorkerLocation associated with the worker. It is a specific location object, mostly a subset of the Location for browsing scopes, but adapted to workers.
+     * The read-only **`location`** property of the WorkerGlobalScope interface returns the WorkerLocation associated with the worker. It is a specific location object, mostly a subset of the Location for browsing scopes, but adapted to workers.
      *
      * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WorkerGlobalScope/location)
      */
@@ -13293,7 +13293,7 @@ declare function postMessage(message: any, options?: StructuredSerializeOptions)
  */
 declare function dispatchEvent(event: Event): boolean;
 /**
- * The **`location`** read-only property of the WorkerGlobalScope interface returns the WorkerLocation associated with the worker. It is a specific location object, mostly a subset of the Location for browsing scopes, but adapted to workers.
+ * The read-only **`location`** property of the WorkerGlobalScope interface returns the WorkerLocation associated with the worker. It is a specific location object, mostly a subset of the Location for browsing scopes, but adapted to workers.
  *
  * [MDN Reference](https://developer.mozilla.org/docs/Web/API/WorkerGlobalScope/location)
  */
@@ -13505,7 +13505,6 @@ type PredefinedColorSpace = "display-p3" | "srgb";
 type PremultiplyAlpha = "default" | "none" | "premultiply";
 type PushEncryptionKeyName = "auth" | "p256dh";
 type RTCDataChannelState = "closed" | "closing" | "connecting" | "open";
-type RTCEncodedVideoFrameType = "delta" | "empty" | "key";
 type ReadableStreamReaderMode = "byob";
 type ReadableStreamType = "bytes";
 type ReferrerPolicy = "" | "no-referrer" | "no-referrer-when-downgrade" | "origin" | "origin-when-cross-origin" | "same-origin" | "strict-origin" | "strict-origin-when-cross-origin" | "unsafe-url";

src/lib/webworker.generated.d.ts

@@ -1,10 +1,10 @@
 //// [tests/cases/compiler/callsOnComplexSignatures.tsx] ////
 
 === Performance Stats ===
-Assignability cache: 2,500
+Assignability cache: 5,000
 Type Count: 10,000
 Instantiation count: 100,000
-Symbol count: 50,000
+Symbol count: 50,000 -> 100,000
 
 === callsOnComplexSignatures.tsx ===
 /// <reference path="react16.d.ts" />

tests/baselines/reference/callsOnComplexSignatures.types

@@ -1,7 +1,7 @@
 //// [tests/cases/compiler/jsxElementType.tsx] ////
 
 === Performance Stats ===
-Assignability cache: 2,500
+Assignability cache: 2,500 -> 5,000
 Type Count: 10,000
 Instantiation count: 100,000
 Symbol count: 50,000