New Twiddle

components.a-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  name: null,
  counter: 1,
  
  didRender() {
    this._super(...arguments);
    console.log(`didRender called on ${this.get('name')}`);
  },
  
  actions: {
    inc() {
      this.set('counter', this.get('counter') + 1);
    }
  }
      
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

{{#a-component name="one"}}
  {{#a-component name="two"}}
    {{a-component name="three"}}
  {{/a-component}}
{{/a-component}}

templates.components.a-component.hbs

{{name}} - {{counter}} <button onclick={{action "inc"}}>inc</button>

<div>
  {{yield}}
</div>

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"
  }
}