hljs

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  sourceCode: `
sdfsdfsdf
sdf
sd
f
sdf
`
});

templates.application.hbs

{{highlight-js code=sourceCode lang='javascript'}}

twiddle.json

{
  "version": "0.15.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.2.2",
    "ember-template-compiler": "3.2.2",
    "ember-testing": "3.2.2"
  },
  "addons": {
    "ember-data": "3.2.0",
	  "ember-highlight-js":"1.0.0"
  }
}