New Twiddle

controllers.application.js

import Ember from 'ember';

window.featureFlags = {
  'foo': true
}

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
	featureFlags: Ember.inject.service(),
  fooEnabled: Ember.computed('featureFlags', function() {
    console.log(this.get('featureFlags').isEnabled('foo'));
		return this.get('featureFlags').isEnabled('foo');
  }),
  barEnabled: Ember.computed('featureFlags', function() {
		return this.get('featureFlags').isEnabled('bar');
  })
});

services.feature-flags.js

import Ember from 'ember';

export default Ember.Service.extend({
  isEnabled(feature) {
    console.log("This was called.")
    // Also add config.environment checks here.
    return !!(window.featureFlags && window.featureFlags[feature]);
  },
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>

Foo Enabled: {{fooEnabled}} <br>
Bar Enabled: {{barEnabled}}
<br>
<br>
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.11.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.10.2",
    "ember-data": "2.11.0",
    "ember-template-compiler": "2.10.2",
    "ember-testing": "2.10.2"
  },
  "addons": {}
}