Hướng dẫn sử dụng Socket.io với Express-generator

app.js

var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var apiRouter = require('./routes/api');

var app = express();

socket.js

var express = require('express');
var router = express.Router();

module.exports = (io) => {
    io.on('connection', socket => {
        let { id } = socket;
        console.log('new connection id:', id);

        socket.on('disconnect', socket => {
            console.log('disconnection id:', id);
        });
    });

    return router;
}