Helper Precedence

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  role: 'adminUser'
});

controllers.application.js

import Ember from 'ember';

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

helpers.role.js

import Ember from 'ember';

export function role([_role]/*, hash*/) {
  return Ember.String.underscore(_role);
}

export default Ember.Helper.helper(role);

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}

{{my-component}}
<br>
<br>

templates.components.my-component.hbs

Hello

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.3.2",
    "ember-template-compiler": "3.3.2",
    "ember-testing": "3.3.2"
  },
  "addons": {
    "ember-data": "3.3.2"
  }
}