import express from 'express'; import http from 'http'; import {Server as SocketIO} from 'socket.io'; //.... const app = express(); const server = new http.Server(app); const io = new SocketIO(server); io.on('connection', function (socket) { console.log(socket); }); //.... const PORT = 8080; server.listen(PORT, () => { console.log(`Listening at http://localhost:${PORT}/`); });