code: def ListFileEntries(self, base_path_specs, output_writer):
      
      for base_path_spec in base_path_specs:
        file_system = resolver.Resolver.OpenFileSystem(base_path_spec)
        file_entry = resolver.Resolver.OpenFileEntry(base_path_spec)
        if file_entry is None:
          logging.warning(
              'Unable to open base path specification:\n{0:s}'.format(
                  base_path_spec.comparable))
          return
  
        self._ListFileEntry(file_system, file_entry, '', output_writer)
docs: Lists file entries in the base path specification.
  
      Args:
        base_path_specs (list[dfvfs.PathSpec]): source path specification.
        output_writer (StdoutWriter): output writer.