count down with most.js

countdown.most.js

import most from 'most';

const load$ = most.fromEvent('DOMContentLoaded', document);
const tick$ = load$.flatMap(() => {
    return most.iterate((f) => f + 1, 0).take(5).flatMap(v => most.of(v).delay(v * 1000));
});

load$.observe(() => console.log('timer start'));
tick$.observe(x => console.log('timer tick', x));