Ember transitionToRoute cleanly in a component without sendAction

Question

How can transitionToRoute be called cleanly from within an Ember component?

It works with injecting a controller into the component and calling the cont

Answer 1

Jan 22, 2018 update
As of Ember 2.15, phase 1 of the public router service is implemented.
Transition to a route from inside a component:

import { inject as service } from '@ember/service';

export default Ember.Component.extend({
  router: service(),

  actions: {
    someAction() {
        this.get('router').transitionTo('index');
    }
  }

});