Implement createFastHash for Bun

In Bun builds, createFastHash uses Bun.hash. See: https://bun.sh/docs/api/hashing#bun-hash

Author: acdlite

packages/react-server/src/ReactServerStreamConfigBun.js

@@ -7,6 +7,8 @@
  * @flow
  */
 
+/* global Bun */
+
 type BunReadableStreamController = ReadableStreamController & {
   end(): mixed,
   write(data: Chunk | BinaryChunk): void,
@@ -98,5 +100,5 @@ export function closeWithError(destination: Destination, error: mixed): void {
 }
 
 export function createFastHash(input: string): string | number {
-  return input;
+  return Bun.hash(input);
 }

scripts/flow/environment.js

@@ -281,3 +281,9 @@ declare module 'node:worker_threads' {
     port2: MessagePort;
   }
 }
+
+declare var Bun: {
+  hash(
+    input: string | TypedArray | DataView | ArrayBuffer | SharedArrayBuffer,
+  ): number,
+};