fix: Fix issue with reused send buffer

mswjs · Nov 29, 2024 · 395e723 · 395e723
1 parent 0ce43e8
commit 395e723
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/src/interceptors/WebSocket/WebSocketClientConnection.ts b/src/interceptors/WebSocket/WebSocketClientConnection.ts
@@ -124,6 +124,14 @@ export class WebSocketClientConnection
    * Send data to the connected client.
    */
   public send(data: WebSocketData): void {
+    // We make a copy of any buffer, in case the client reuses it and overwrites bytes.
+    if (ArrayBuffer.isView(data)) {
+      const buffer = data.buffer.slice(data.byteOffset, data.byteOffset + data.byteLength)
+      data = Reflect.construct(data.constructor, [buffer])
+    } else if (data instanceof ArrayBufer) {
+      data = data.slice(0)
+    }
+
     this.transport.send(data)
   }