code: def available(self) -> bool:
      return self.is_group("")
  
file_path: hydra/hydra/_internal/core_plugins/file_config_source.py
imports: import os
  from typing import List, Optional
  from omegaconf import OmegaConf
  from hydra.core.object_type import ObjectType
  from hydra.plugins.config_source import ConfigLoadError, ConfigResult, ConfigSource
label_desc: Use image node_id 4 for calling the FileConfigSource obj's underlying member method code with example usage: obj.available() and returns: self