class Sprockets::Base

def each_logical_path(*args)
  return to_enum(__method__, *args) unless block_given?
  filters = args.flatten
  files = {}
  each_file do |filename|
    if logical_path = logical_path_for_filename(filename, filters)
      yield logical_path unless files[logical_path]
      files[logical_path] = true
    end
  end
  nil
end