Ember.js: Does App.X = Y essentially means "export default" in new ES6 module system?

Sorry for the newbie question. I haven't started using Ember yet. At the moment I'm still studying whether it's suitable for our project. A big attraction of Ember for us is Ember Data. I've been reading the documentation on it. In a lot of the examples, I'd see the following pattern:

App.Requirement = DS.Model.extend({
  name: attr('string'),
  temperature: attr('temperature')
});

In other places though, I'd see the following:

export default DS.Model.extend({
  firstName: DS.attr(),
  lastName: DS.attr(),
  birthday: DS.attr()
});

Is the App.X = Y syntax just an obsolete way of exporting a class/function?