New Twiddle

components.component-a.js

import Ember from 'ember';

const { Component, RSVP } = Ember;

export default Component.extend({
  actions: {
    doFoo(bar) {
      return RSVP.resolve(bar).finally(() => {
        console.log(`did foo with bar ${bar} in A`);
      });
    }
  }
});

components.component-b.js

import Ember from 'ember';

const { Component, get } = Ember;

export default Component.extend({
  actions: {
    doQuux(bar) {
      get(this, 'onDoFoo')(bar).finally(() => {
        console.log(`did quux with bar ${bar} in B by calling onDoFoo`)
      });
    }
  }
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
{{component-a}}

templates.components.component-a.hbs

<h2>Component A</h2>
{{component-b onDoFoo=(action 'doFoo')}}

templates.components.component-b.hbs

<h3>Component B</h3>
<button {{action (action 'doQuux' 42) on='click'}}>Click me!</button>

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": {}
}