index.js

var express = require('express');
var socket = require('socket.io');

// App setup
var app = express();
var server = app.listen(4200, function(){
    console.log('listening for requests on port 4200,');
});

// Static files
app.use(express.static('website'));

// Socket setup
var io = socket(server);

// Listen for new connection and print a message in console 
io.on('connection', (socket) => {

    console.log('made socket connection', socket.id);

    // Listening for chat event
    socket.on('chat', function(data){
        console.log('chat event trigged at server');
        console.log('need to notify all the clients about this event');
        //io.sockets.emit('chat', data);
    });

    // Listening for typing event
    socket.on('typing', function(data){
        console.log('Server received someone is typing');
        console.log('need to inform all the clients about this');
        //io.sockets.emit('typing', data);
        //socket.broadcast.emit('typing', data);
    });

});