Ember-fetch

HTML5 fetch polyfill from github wrapped and bundled for ember-cli users.

• intro to fetch
• spec
• usage
• origin repo

Installation

• ember install ember-fetch

Usage

import Route from '@ember/routing/route';
import fetch from 'fetch';

export default Route.extend({
  model() {
    return fetch('/my-cool-end-point.json').then(function(response) {
      return response.json();
    });
  }
});

Available imports:

import fetch, { Headers, Request, Response, AbortController } from 'fetch';

Use with Ember Data

To have Ember Data utilize fetch instead of jQuery.ajax to make calls to your backend, extend your project's application adapter with the adapter-fetch mixin.

// app/adapters/application.js
import DS from 'ember-data';
import AdapterFetch from 'ember-fetch/mixins/adapter-fetch';

export default DS.RESTAdapter.extend(AdapterFetch, {
  ...
});

Use with Fastboot

Currently, Fastboot supplies its own server-side ajax functionality, and including ember-fetch and the adapter-fetch mixin in a Fastboot app will not work without some modifications. To allow the node-fetch polyfill that is included with this addon to make your API calls, you must add an initializer to the consuming app's fastboot directory that overrides the one Fastboot utilizes to inject its own ajax.

Example:

// fastboot/initializers/ajax.js

export default {
  name: 'ajax-service',
  initialize() {
    // noop
    // This is to override Fastboot's initializer which prevents ember-fetch from working
    // https://github.com/ember-fastboot/ember-cli-fastboot/blob/master/fastboot/initializers/ajax.js
  }
}

For addon authors, if the addon supports Fastboot mode, ember-fetch should also be listed as a peer dependency. This is because Fastboot only invokes top-level addon's updateFastBootManifest (defail), thus ember-fetch has to be a top-level addon installed by the host app.

Allow native fetch

ember-fetch allows access to native fetch in browser through a build config flag:

// ember-cli-build.js
let app = new EmberAddon(defaults, {
  // Add options here
  'ember-fetch': {
    preferNative: true
  }
});

If set to true, the fetch polyfill will be skipped if native fetch is available, otherwise the polyfilled fetch will be installed during the first pass of the vendor js file.

If set to false, the polyfilled fetch will replace native fetch be there or not.

The way you do import remains same.

Browser Support

• evergreen / IE10+ / Safari 6.1+ https://github.com/github/fetch#browser-support

Q & A

Does it work with pretender?

Yes, pretender v2.1 comes with fetch support.

Does this replace ic-ajax?

• ideally yes, but only if you cater to IE9+
• for basic drop-in compat import ajax from 'ember-fetch/ajax'

What about all the run-loop and promise mixing details?

• taken care of for you

Why is this wrapper needed?

• original emits a global
• original requires a Promise polyfill (ember users have RSVP)
• original isn't Ember run-loop aware

Won't this wrapper get out-of-sync?

• we actually don't bundle github/fetch rather we merely wrap/transform what comes from node_modules, so we should be resilient to changes assuming semver from the fetch module