server.mjs 

import { App } from "uWebSockets.js";
import { Server } from "socket.io";

const app = new App();
const io = new Server({
  serveClient: false,
  transports: ["websocket"],
});

io.attachApp(app);

io.engine.on("initial_headers", (headers, req) => {
  console.log("initial headers event emitted");
});

io.on("connection", (socket) => {
  console.log("connected");
});

app.listen(3000, (token) => {
  if (token) {
    console.log("Server listening on port 3000");
  } else {
    console.log("Failed to listen on port 3000");
  }
});

const socket = io("http://localhost:3000", {
  transports: ["websocket"],
  reconnection: true,
});