Sleepjs has all standard JS Promise capabilities

sleepjs1_promise_capabilities.js

// https://github.com/simsieg/sleepjs
const { sleep, sleepSeconds, sleepMinutes } = require('sleepjs')

// chain sleeps of different intervals
async function chainingFunc() {
  await sleep(500);
  alert("Hello");
  await sleepSeconds(1);
  alert("Hello");
  await sleepSeconds(2);
  alert("Hello");
  await sleepSeconds(4);
  alert("Hello");
}

// execute sleeps simultenously
const simultaneousFunc = async () => Promise.all([
  sleep(500).then(() => alert("Hello")),
  sleepSeconds(1).then(() => alert("Hello")),
  sleepSeconds(2).then(() => alert("Hello")),
  sleepSeconds(4).then(() => alert("Hello")),
]);

// integrate with other promises
async function integrateFunc() {
  await fetchData(); // this is a promise
  await sleepMinutes(1);
  
  await fetchData();
  await sleepMinutes(2);
  
  await fetchLaterData();
  await sleepMinutes(4);
}

chainingFunc();
simultaneousFunc();
integrateFunc();