tonic + npm: bluebird

const Promise = require('bluebird'); Promise.series = (promiseArr) => Promise.each(promiseArr, (result) => result); const func1 = () => new Promise((resolve, reject) => { console.log('func1 start') setTimeout(() => { console.log('func1 complete'); resolve() }, 20) }) const func2 = () => new Promise((resolve, reject) => { console.log('func2 start') setTimeout(() => { console.log('func2 complete'); resolve() }, 10) }) Promise.series([func1(), func2()])