Multiplayer Pub in Babylon.js With Colyseus

TYPESCRIPT
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import express from "express";
import cors from "cors";
import { createServer } from "http";
import { Server } from "@colyseus/core";
import { monitor } from "@colyseus/monitor";
import { WebSocketTransport } from "@colyseus/ws-transport";

import { GameRoom } from "./rooms/GameRoom";

const port = Number(process.env.PORT || 8081);
const app = express();

const corsOptions = {
  origin: "https://balazspub.netlify.app",
  optionsSuccessStatus: 200,
};

app.use(cors(corsOptions));
app.use(express.json());

const gameServer = new Server({
  transport: new WebSocketTransport({
    server: createServer(app),
  }),
});

gameServer.define("GameRoom", GameRoom);

gameServer.onShutdown(() => {
  console.log("Server is shutting down.");
});

app.use("/colyseus", monitor());

gameServer.listen(port);