code: def prepare(self, input_files, bundle):
          
          out = []
          for input_file in input_files:
              if input_file.extension == "less" and os.path.isfile(input_file.abs_path):
                  output_file = self.get_compile_file(input_file, bundle)
                  self.compile(input_file, output_file)
                  out.append(output_file)
              else:
                  out.append(input_file)
          return out
docs: :type input_files: list[static_bundle.files.StaticFileResult]
          :type bundle: static_bundle.bundles.AbstractBundle
          :rtype: list