how to use es6-promises with typescript?

Question

I read this SO question but having trouble getting promises to work with typescript. Hopefully we can make a clear guide. This is for a server/node project. I'm actually using latest iojs, but targeting ES5 as output.

$ tsd query es6-promise --action install --save $ npm install --save es6-promise   // typescript code:  /// <reference path="../../typings/es6-promise/es6-promise.d.ts"/>  var Promise = require("es6-promise").Promise; require('es6-promise').polyfill();  function test():Promise {     var p:Promise = new Promise();     return p; } 

this is giving the error:

Cannot find name 'Promise'. 

// alternatively:

var p = new Promise<string>((resolve, reject) => {     resolve('a string'); });   //error=> Untyped function calls may not accept type arguments. 

What is the recommended way to return a Promise from your own node server side code?

references:

• https://www.npmjs.com/package/es6-promise

• https://github.com/borisyankov/DefinitelyTyped/blob/master/es6-promise/es6-promise-commonjs-tests.ts

Answer 1

main.ts

import {Promise} from 'es6-promise'; const p: Promise<string> = new Promise (    (resolve: (str: string)=>void, reject: (str: string)=>void) => {       const a: string = "hello from Promise";       resolve(a);    }  ); p.then((st) => {   console.log(st); }); 

tsconfig.json

{     "compilerOptions": {         "target": "es3",         "module": "commonjs",         "declaration": false,         "noImplicitAny": false,         "noLib": false     },     "filesGlob": [         "./**/*.ts",         "!./node_modules/**/*.ts"     ],     "files": [         "./main.ts",         "./typings/es6-promise/es6-promise.d.ts"     ] } 

compileandrun.sh

#!/bin/sh npm install es6-promise tsd install es6-promise tsc node main.js 

Answer 2

The following was on v2.1.1+ with the target set to es5

I was able to use Promises with async/await by installing es6-promise and then adding this to the top of the file:

global.Promise = require('es6-promise').Promise; 

And this to tsconfig.json

"lib": [ "es2015.promise", "es5" ], 

---

Using the import { Promise } form did not work for me as other libraries were crashing (ex: axios)