Ember js warning with three.js

What is the correct way to use Ember js with three.js. I have tried using it with cdn by editing the index.html file which works fine but i get warning in ember-cli about THREE not being defined. Also installing it with bower and using app.import gave me similar warnings.

The app works all fine but i wanted to know what is the best way to import in this case three.js into an ember application without the warnings.