Parent overrides default

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
});

components.nested-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  foo: 'bar'
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

{{my-component}}

templates.components.my-component.hbs

<h1>Comp 1</h1>
{{nested-component
foo=foo
}}

templates.components.nested-component.hbs

{{foo}}

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": {}
}