example for https://stackoverflow.com/questions/54846597/angular-2-observable-with-setinterval-not-updating-in-template-using-async-pipe

index.js

const { rxObserver } = require('api/v0.3');
const { timer } = require('rxjs');
const { map, take } = require('rxjs/operators');

timer(0, 100)
  .pipe(
    take(5),
    map(()=>Date.now())
  )
  .subscribe(rxObserver());