stack/apps/web/src/lib/socket.ts

import { io, type Socket } from 'socket.io-client';

const GATEWAY_URL = process.env['NEXT_PUBLIC_GATEWAY_URL'] ?? 'http://localhost:4000';

let socket: Socket | null = null;

export function getSocket(): Socket {
  if (!socket) {
    socket = io(`${GATEWAY_URL}/chat`, {
      withCredentials: true,
      autoConnect: false,
    });
  }
  return socket;
}