An RxJS example of reporting events that happened every 5 seconds.

reportInterval.js

// throw these two lines into the markup:
// <button id="btn">Click</button>
// <script src="https://unpkg.com/@reactivex/rxjs/dist/global/Rx.js"></script>

const button = document.querySelector('#btn');
const click$ = Rx.Observable.fromEvent(button, 'click');

click$
  .map(() => Date.now())
  .bufferTime(5000)
  .filter(e => e.length > 0)
  .subscribe(console.log)