docs: def dump_db(db, file,
              pretty=False,
              overwrite=False,
              verbose=True):
      """
      Dump :class:`mongomock.database.Database` to a local file. Only support
      ``*.json`` or ``*.gz`` (compressed json file)
  
      :param db: instance of :class:`mongomock.database.Database`.
      :param file: file path.
      :param pretty: bool, toggle on jsonize into pretty format.
      :param overwrite: bool, allow overwrite to existing file.
      :param verbose: bool, toggle on log.
      """
      db_data = _dump(db)
      json.dump(
          db_data, file,
          pretty=pretty, overwrite=overwrite, verbose=verbose,
      )