Awesome
sleep-promise 
sleep-promise resolves a promise after a specified delay.
Installation
node.js
npm install sleep-promise
Usage async / await
import sleep from 'sleep-promise';
(async () => {
await sleep(2000);
console.log('2 seconds later …');
})();
Usage ES5
var sleep = require('sleep-promise');
sleep(2000).then(function() {
console.log('2 seconds later …');
});
Usage in a promise chain
import sleep from 'sleep-promise';
let trace = value => {
console.log(value);
return value;
};
sleep(2000)
.then(() => 'hello')
.then(trace)
.then(sleep(1000))
.then(value => value + ' world')
.then(trace)
.then(sleep(500))
.then(value => value + '!')
.then(trace);
// [2 seconds sleep]
// hello
// [1 second sleep]
// hello world
// [500 ms sleep]
// hello world!
Usage in a test file that mocks setTimeout
import sinon from 'sinon';
import sleep from 'sleep-promise';
const clock = sinon.useFakeTimers();
(async () => {
// 2 seconds faked by sinon
const sleepPromise = sleep(2000);
clock.tick(2000);
await sleepPromise;
console.log('instant');
// Caches global setTimeout before sinon replaced it
const sleepPromise2 = sleep(2000, { useCachedSetTimeout: true });
clock.tick(2000);
await sleepPromise2;
console.log('2 seconds later');
})();