module Sprockets::Rails::HelperAssetResolvers

def self.[](name)

:nodoc:
the class namespace with our internals.
Use a separate module since Helper is mixed in and we needn't pollute 
def self.[](name)
  case name
  when :manifest
    Manifest
  when :environment
    Environment
  else
    raise ArgumentError, "Unrecognized asset resolver: #{name.inspect}. Expected :manifest or :environment"
  end
end