How do I add a CSS class to the application view in Ember 2.8?

Views are gone since Ember 2.0.0, but you could do this:

// app/views/application.js or app/application/view.js
import Ember from 'ember';

export default Ember.Component.extend({
  classNames: []
});

In Ember CLI 2.8 this workaround no longer works, looks like the views folder is now being ignored. However, the Ember inspector still shows this for the application view:

view:foobar@view:toplevel

And the HTML is:

<div id="ember420" class="ember-view"><h2>application</h2>
</div>

So, there must be a way to customize the view.