Feature request: Custom Promise constructor

Allow defining a Promise constructor instead of using globals. The current implementation requires using polyfills that use globals.

Example

axios.defaults.promise = PromisePolyfill;
axios.get('/foo');

or

var axios_instance = axios.create({
  promise: PromisePolyfill
});

axios_instance.get('/foo');

[jvmccarthy]

Hi @rubennorte, funny that I was working on a PR at the same time you were closing this issue. I’m glad to see that promises are now a native feature, but I still think there are reasons for making promises pluggable.

Thank you and the team for your work on axios and for your consideration.

[Morgul]

+1 Here’s my use case: I use Bluebird on the server side. I also want to use axios on the server side for accessing some external REST APIs. However, since I’m on node 5, axios returns promises that work with the default Promise implementation, and I have to wrap them whenever I want to use .map or the like, which is common.

My choices are to either patch the global Promise, or tell axios which promise library to use. I’d rather do the latter.