server.2.js

import express from 'express';
import bodyParser from 'body-parser';
import morgan from 'morgan';
import socketio from 'socket.io'; 
import http from 'http'; 
const app = express();
app.use(morgan('dev'));
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());

app.get('/', (req, res) => res.json({ hello: 'world!' })); 

const server = http.createServer(app); 
const io = socketio(server); 

let messages = []; // o seu banco de dados!

io.on('connection', (socket) => {
  socket.emit('messages', messages);
  socket.emit('hello', 'Welcome!');
  socket.on('sent message', (message) => {
    messages.push(message);
    io.emit('new message', message);
  });
});
const port = process.env.PORT || 3000;
server.listen(port, () => console.log(`[x] Magic happens on port: ${port}`));

export default app;