# File lib/sprockets/secretary.rb, line 39
    def add_source_files(source_files, options = {})
      expand_paths(source_files, options).each do |source_file|
        if pathname = environment.find(source_file)
          preprocessor.require(pathname.source_file)
        else
          raise Sprockets::LoadError, "no such file `#{source_file}'"
        end
      end
    end