Uncaught (in response) Error: The script will never generate a response

✘ [ERROR] Uncaught (in response) Error: The script will never generate a response.

export default {
    fetch(request) {
      const [client, server] = Object.values(new WebSocketPair());
  
      server.accept();
      server.addEventListener("message", (event) => {
        server.send(event.data);
      });
  
      return new Response(null, {
        status: 101,
        webSocket: client,
      });
    },
  };