New Twiddle

components.my-child-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  actions: {
    hi() {
      this.sendAction();
    }
  }
});

components.my-parent-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  someMethod() {
    alert('hi!');
  }
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
{{#my-parent-component myChild='my-child-component' outerProp="yo"}}
  Hi
{{/my-parent-component}}
<br>

{{outlet}}
<br>
<br>

templates.components.my-child-component.hbs

<button {{action 'hi'}}>{{yield}} {{someProp}}</button>

templates.components.my-parent-component.hbs

<div style="background-color: red; padding: 10px;">
{{#component myChild someProp=outerProp action=someMethod}}
  {{yield}}
{{/component}}
</div>

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "1.13.13",
    "ember-data": "2.9.0",
    "ember-template-compiler": "1.13.13",
    "ember-testing": "1.13.13"
  },
  "addons": {}
}