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Start a simple WebSocket server using JSTime.serve. Inside fetch, we attempt to upgrade incoming ws: or wss: requests to WebSocket connections. 
const server = JSTime.serve<{ authToken: string }>({
  fetch(req, server) {
    const success = server.upgrade(req);
    if (success) {
      // JSTime automatically returns a 101 Switching Protocols
      // if the upgrade succeeds
      return undefined;
    }

    // handle HTTP request normally
    return new Response("Hello world!");
  },
  websocket: {
    // this is called when a message is received
    async message(ws, message) {
      console.log(`Received ${message}`);
      // send back a message
      ws.send(`You said: ${message}`);
    },
  },
});

console.log(`Listening on localhost:\${server.port}`);