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===================================================   SERVER    ===================================================

const io = require('socket.io')();

io.on('connection', (client) => {
  client.on('subscribeToTimer', (interval) => {
    console.log('client is subscribing to timer with interval ', interval);
    setInterval(() => {
      client.emit('timer', new Date());
    }, interval);
  });
});

const port = 8000;
io.listen(port);
console.log('listening on port ', port);

===================================================   SERVER    ===================================================
import openSocket from 'socket.io-client';
const  socket = openSocket('http://localhost:8000');

function subscribeToTimer(cb) {
  socket.on('timer', timestamp => cb(null, timestamp));
  socket.emit('subscribeToTimer', 1000);
}

export { subscribeToTimer };