docs: def _find_files(self):
          """Find files recursively in the root path
          using provided extensions.
  
          :return: list of absolute file paths
          """
          files = []
          for ext in self.extensions:
              ext_files = util.find_files(self.root, "*" + ext)
              log.debug("found {} '*{}' files in '{}'".format(
                  len(ext_files), ext, self.root)
              )
              files.extend(ext_files)
          return files