Ember.js - Getting App instance in module

I have to port a non-cli project to the cli. I have a route that is:

App.thisRoute = App.previouslyDefinedRoute.extend({...})

With the CLI, I've tried this:

// routes/thisRoute.js
import App from 'app';

export default App.previouslyDefinedRoute.extend({...})

That gives me this Ember Inspector Error:

Ember Inspector has errored.

...

Error message: Could not find module app imported from app/routes/thisRoute

I've also tried:

// routes/thisRoute.js
import App from 'routes/previouslyDefinedRoute.js';

export default App.previouslyDefinedRoute.extend({...})

Both dont work.

How do I get my app instance?