code: def is_config(self, config_path: str) -> bool:
      filename = self._normalize_file_name(config_path.rstrip("/"))
      type_ = self.store.get_type(filename)
      return type_ == ObjectType.CONFIG
  
file_path: hydra/hydra/_internal/core_plugins/structured_config_source.py
imports: import importlib
  import warnings
  from typing import List, Optional
  from hydra.core.config_store import ConfigStore
  from hydra.core.object_type import ObjectType
  from hydra.plugins.config_source import ConfigResult, ConfigSource
label_desc: Use image node_id 6 for calling the StructuredConfigSource obj's underlying member method code with example usage: obj.is_config(config_path) and returns: unknown