Allow Bluebird to be assignable to ES2016 Promise.

[Strate]

See ##11027

[dt-bot]

bluebird/bluebird.d.ts

to author (@lhecker). Could you review this PR?
👍 or 👎?

Checklist

• pass the Travis CI test?

[lhecker]

@Strate LGTM 🎉

To fix the failing tests I recommend replacing the return; etc. with e.g. return bar;. After that you can use npm test before pushing something to check if it works properly. (I think force-pushing with git commit --amend should be fine too.)

[Strate]

I have made .then method overloadings corresponding with https://github.com/Microsoft/TypeScript/blob/fb9806b5f9e883d8da964d029318bee769cd96cc/src/lib/es2015.promise.d.ts#L5-L32

[OliverJAsh]

Unfortunately the Promise typings have changed in TS version 2 and so these typings no longer correspond: https://github.com/Microsoft/TypeScript/blob/070aa83cc06b2974639bbefcde98e6e2fb5fe693/src/lib/es2015.promise.d.ts

[albertkim]

^ What is the solution around this now?

[nfantone]

I'm working on a PR right now. I made the declaration of class Bluebird implement Promise from lib.es6.d.ts.

declare class Bluebird<R> implements Promise<R>, Bluebird.Inspection<R> {

Problem is, I'm unsure as to how to get a reference to that Promise type from within DT. Can I add this to the tsconfig.json file? Is that allowed?

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

Pinging @lhecker, @Strate and @vvakame.

[Strate]

@nfantone Don't forget to implement overloadings for all methods, which returns Promise, to force them to return Bluebird

[nfantone]

Yes, that's done. But still, I don't know what's the proper way of getting a reference to the native Promise library.