injection to helpers

controllers.application.js

import Ember from 'ember';

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

helpers.my-t.js

export default Ember.Helper.extend({
  compute: function(params) {
    console.log(this.get('application'));
    return 'hello ' + params[0] + ' from ' + this.get('application.currentRouteName');
  }
});

initializers.my-t.js

export default {
  name: 'my-t-injection',
  initialize: function(registry, application) {
    console.log(registry.lookup('controller:application'));
    application.register('helper:my-t', 'application', 'controller:application');
  }
};

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{my-t 'world'}}
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.4.8",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.8/ember.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/1.13.9/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.8/ember-template-compiler.js"
  }
}