Helper issue

controllers.application.js

import Ember from 'ember';

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

helpers.has-permission.js

import Ember from 'ember';

/**
 * This helper returns if the user has any of the supplied permission or not.
 * If all=true is applied then all the supplied permissions have to be present.
 *
 * @example {{has-permission 'communicate' 'communicate.send' all=true }}
 */
export default Ember.Helper.extend({
    compute: function(params, hash) {
        //let permissions = this.get('sessionAccount.user.permissions');
        return this.hasPermission(/*permissions*/['track'], params, hash.all);
    },

  	// This function is usually in its own util file
    hasPermission(userPermissions, permissions, allRequired) {
           for (let i = 0; i < permissions.get('length'); i++) {
               if (userPermissions.includes(permissions.objectAt(i))) {
                   return true;
               }
           }
           return false;
   }

});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{#if (has-permission 'track')}}
	SUCCESS
{{/if}}
<br>
<br>

twiddle.json

{
  "version": "0.10.7",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "canary",
    "ember-data": "2.10.0",
    "ember-template-compiler": "canary",
    "ember-testing": "canary"
  },
  "addons": {}
}