tap-and-hold.js

const touchStart = Rx.Observable.fromEvent(window, 'touchstart').timestamp();
const touchMove = Rx.Observable.fromEvent(window, 'touchmmove');
const touchEnd = Rx.Observable.fromEvent(window, 'touchend').timestamp();

const touchAndHold = touchStart
  .flatMap(() => touchEnd.takeUntil(touchMove), (x, y) => { start: x.timestamp, end: y.timestamp })
  .filter(ts => (ts.end - ts.start) / 1000 > 2);
  
const subscription = touchAndHold.subscribe(
  () => console.log('touch and hold!')
);