I'm not sure I know what you mean by a helper module. Are you referring to the `helper` method?

http://api.rubyonrails.org/classes/AbstractController/Helpers/ClassMethods.html#method-i-helper

If the goal is to make `current_user`, `signed_in?`, and `signed_out?` available to view templates, that's handled by line 6. The other methods are intended to be used by controllers.