Type structuredClone typed arrays as ArrayBuffer-backed (#59147)

Summary:
Pull Request resolved: #59147

`cloneTypedArray` passes `value.buffer` to `cloneArrayBuffer(value: ArrayBuffer)`. With TypeScript's ES2024 `ArrayBuffer` definitions, `$TypedArray` (meaning `$TypedArray<ArrayBufferLike>`) has an `ArrayBufferLike` buffer, which is no longer an `ArrayBuffer`. Hermes, React Native's default engine, has no `SharedArrayBuffer`, and `cloneArrayBuffer` already treats its input and its `slice(0)` copy as an `ArrayBuffer`. This narrows `isTypedArray`'s refinement and `cloneTypedArray`'s parameter to `$TypedArray<ArrayBuffer>`. It is a type-only change.

Changelog: [Internal]

Differential Revision: D125721761

fbshipit-source-id: 77ccc4b89e9018c3d6656ec7bfc4cb6874f48e86

Author: SamChou19815

packages/react-native/src/private/webapis/structuredClone/structuredClone.js

@@ -308,7 +308,7 @@ function cloneArrayBuffer(value: ArrayBuffer): ArrayBuffer {
   return result;
 }
 
-function cloneTypedArray(value: $TypedArray): $TypedArray {
+function cloneTypedArray(value: $TypedArray<ArrayBuffer>): $TypedArray {
   const buffer = cloneArrayBuffer(value.buffer);
   const {byteOffset, length} = value;
 
@@ -365,7 +365,9 @@ function defineEnumerableProperty(
   });
 }
 
-declare function isTypedArray(value: unknown): implies value is $TypedArray;
+declare function isTypedArray(
+  value: unknown,
+): implies value is $TypedArray<ArrayBuffer>;
 function isTypedArray(value: unknown): boolean {
   return ArrayBuffer.isView(value) && !(value instanceof DataView);
 }