Ponyfill Promise with pinkie-promise

[floatdrop]

Alternative way to support Node.js 0.10 (see #244).

We are using co in ava test framework and polyfilling global Promise object is not working for us, because it will affect code under testing. If code under testing relies on Promise object and we polyfill it globally it will pass tests on Node.js 0.10, but will fail in production.

This approach supports polyfilling global Promise with global.Promise = require('bluebird'); and returns native promises (if available). If neither works it will return small pinkie polyfill.

[sindresorhus]

👍

[fengmk2]

No, let's forget 0.x of node.
It's time to use node 4.x.

[sindresorhus]

Personally yes, but unrealistic, at least for us, seeing as Node.js 0.10 is LTS until October 2016.

[fengmk2]

If you want to use node 0.10.x, you need to set Promise to global, it's not co need to make sure Promise exists.

global.Promise = global.Promise || require('pinkie');
var co = require('co');

https://github.com/tj/co/blob/master/package.json#L33 see engines too.

[floatdrop]

@fengmk2 this is not working for us, because global.Promise = ... will pollute global scope and code, that uses Promise object in Node.js 0.10 will pass tests but will fail in production.

[madbence]

the readme describes well that you need a Promise implementation, imho this is outside of cos scope