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AllowSharedBufferSource definition is incorrect #61480
Description
⚙ Compilation target
ESNext or any
⚙ Library
ES2024 or newer
Missing / Incorrect Definition
type AllowSharedBufferSource = ArrayBuffer | ArrayBufferView;should be
type AllowSharedBufferSource = ArrayBuffer | SharedArrayBuffer | ArrayBufferView;or simply
type AllowSharedBufferSource = BufferSource | SharedArrayBufferSample Code
// Before lib=ES2024, this works, though it seems like it shouldn't.
const x: AllowSharedBufferSource = new SharedArrayBuffer(4);
// The reason is that SharedArrayBuffer is structurally a subtype of ArrayBuffer:
const y: ArrayBuffer = new SharedArrayBuffer(4);
// However when you switch to lib=ES2024+, it (correctly) doesn't work anymore, because
// ArrayBuffer gained some properties that SharedArrayBuffer doesn't have.Error (playground link):
Type 'SharedArrayBuffer' is not assignable to type 'AllowSharedBufferSource'.
Type 'SharedArrayBuffer' is missing the following properties from type 'ArrayBuffer': resizable, resize, detached, transfer, transferToFixedLength
Documentation Link
https://webidl.spec.whatwg.org/#AllowSharedBufferSource
WebIDL:
typedef (ArrayBuffer or SharedArrayBuffer or [AllowShared] ArrayBufferView) AllowSharedBufferSource;
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