New Twiddle

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  classNameBindings: ['blah'],
  blah: false,
  didInsertElement() {
  	Ember.run.later(() => {
    	this.set('blah', true);
    }, 5000);
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  init() {
  	this._super();
    
    Ember.run.later(() => {
    	$('.a').addClass('foobar');
    }, 2000);
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{my-component classNames="a b c"}}
<br>
<br>

templates.components.my-component.hbs

{{yield}}
dsfgsfd

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}