New Twiddle

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle'
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{#my-component}}
From application/template.hbs
{{/my-component}}
<br>
<br>

my-component.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  didInitAttrs() {
    Ember.run.next(this, () => {
      if ( this.get('template') ) {
	    console.log('Component has block!');
                 }
    });
  }
    
});

my-component.template.hbs

{{#if hasBlock}}
	Component has block
{{else}}
	No block
{{/if}}
<br/>
{{yield}}

twiddle.json

{
  "version": "0.4.10",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.9/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/1.13.11/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.9/ember-template-compiler.js"
  }
}