Heyoffline in Ember CLI

I am building an Ember CLI app and want to use Heyoffline.js. I have installed this using Bower:

bower.js:

"Heyoffline": "~1.1.1"

Brocfile:

app.import('bower_components/Heyoffline/heyoffline.js');

I am then trying to load this using an initialiser, as below. However this does not seem to work - nothing happens when I go offline. There are no errors in the console. Am I loading this incorrectly? Thanks.

export default {
    name: 'heyoffline',
    initialize: function() {

        document.addEventListener('deviceready', function () {

            new Heyoffline();

        }, false);
    }
};