module Sprockets::Rails::Helper

def self.included(klass)
  if klass < Sprockets::Context
    klass.class_eval do
      alias_method :assets_environment, :environment
      def assets_manifest; end
      class_attribute :config, :assets_prefix, :digest_assets, :debug_assets
    end
  else
    klass.class_attribute(*VIEW_ACCESSORS)
  end
end