socket.io acknowledge node.js sample

serve.js

var io = require('socket.io')(8090);

io.on('connection', function (socket) {
  console.log('connected')
  socket.on('ferret', function (name, fn) {
    console.log('ferret')
    fn('woot');
  });
});

const ioClient = require('socket.io-client');
var client = ioClient.connect('http://localhost:8090');
client.emit('ferret', 'tobu', () => {
  console.log('ack')
});

Really useful, thanks!