Fetch Ponyfill

> WHATWG fetch ponyfill

This module wraps the github/fetch polyfill in a CommonJS module
for browserification, and avoids appending anything to the window, instead returning a setup
function when fetch-ponyfill is required. Inspired by
object-assign.

When used in Node, delegates to node-fetch instead.

Usage

$3

``javascript
const {fetch, Request, Response, Headers} = require('fetch-ponyfill')(options);
`

$3

`javascript
import fetchPonyfill from 'fetch-ponyfill';
const {fetch, Request, Response, Headers} = fetchPonyfill(options);
`

$3

Where options is an object with the following optional properties:

| option | description |
| ------ | ----------- |
| Promise | An A+ Promise implementation. Defaults to window.Promise in the browser, and global.Promise in Node. |
| XMLHttpRequest | The XMLHttpRequest constructor. This is useful to feed in when working with Firefox OS. Defaults to window.XMLHttpRequest`. Has no effect in Node. |