require environment before require ember-rails results in error "define is not defined"

I see error in console when I load the page:
```
Uncaught ReferenceError: define is not defined
at environment.self-5ac0a43….js?body=1:1
DEBUG: -------------------------------
ember.self-afe3db4….js?body=1:5736 DEBUG: Ember : 2.10.2
ember.self-afe3db4….js?body=1:5736 DEBUG: Ember Data : 2.10.0
ember.self-afe3db4….js?body=1:5736 DEBUG: jQuery : 1.12.4
ember.self-afe3db4….js?body=1:5736 DEBUG: -------------------------------
VM3711:83 Ember Inspector Active
```

Error dissapears when I move "//= require ./environment" after "//= require ember-rails/application" in application.es6 file.

Is it by design or should it be fixed in ember-rails?

ruby 2.3.3p222, rails 5.0.1, macOS 10.12.2, Chrome 55.0.2883.95 (64-bit)