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fix: Fix issue with reused send buffer #680

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8 changes: 8 additions & 0 deletions src/interceptors/WebSocket/WebSocketOverride.ts
Original file line number Diff line number Diff line change
Expand Up @@ -141,6 +141,14 @@ export class WebSocketOverride extends EventTarget implements WebSocket {
return
}

// We should copy the buffer in case the buffer is reused and changed by the sender
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 ArrayBuffer) {
data = data.slice(0)
}

// Buffer the data to send in this even loop
// but send it in the next.
this.bufferedAmount += getDataSize(data)
Expand Down