javascript - ES2015 equivalent of $.Deferred() -

i'm using babel project , i'm stuck basic problem. i'm used jquery's deferred objects , i'm struggling find es2015 equivalent, here want:

// file1.js let dfd = new promise()  function functioncalledatsomepoint(thing) {     dfd.resolve(thing) }  export default { dfd }   // file2.js import { dfd } './file1'  dfd.then((thing) => {     console.log('yay thing:', thing) }) 

what should correct way right simple deferred?

edit royhowie's answer:

// file1.js let thing function getthing(_thing) {     return new promise((resolve) => {         if (el) {             thing = new thing(el)         }         resolve(thing)     }) }  function functioncalledatsomepoint(el) {     getthing(el) }  export default { getthing }   // file2.js import { getthing } './file1'  getthing.then((thing) => {     console.log('yay thing:', thing) }) 

you can export promise directly (instead of function)—like have—but you'll able use (.then) once, not want.

instead, should export function returns promise:

file 1.js

import user '../models/user'  export function getusersfromdatabase () {     return new promise((resolve, reject) => {         user.find({}, (err, users) => {             return err ? reject(err) : resolve(users)         })     }) } 

file2.js

import { getusersfromdatabase } './file1'  getusersfromdatabase().then((users) => {     // success }).catch((err) => {     // no users }) 

you can use default promise implementation, but slower 3rd party modules, e.g., bluebird (which recommend using).