code: def add_domain_param(
      parser: Union[
          argparse.ArgumentParser, argparse._ActionsContainer
      ],
      default: Optional[Text] = DEFAULT_DOMAIN_PATH,
  ) -> None:
      parser.add_argument(
          "-d",
          "--domain",
          type=str,
          default=default,
          help="Domain specification. This can be a single YAML file, or a directory "
          "that contains several files with domain specifications in it. The content "
          "of these files will be read and merged together.",
      )
  
file_path: rasa/rasa/cli/arguments/default_arguments.py
imports: import argparse
  import logging
  from typing import Text, Union, Optional
  from rasa.shared.constants import DEFAULT_CONFIG_PATH, DEFAULT_DOMAIN_PATH, DEFAULT_MODELS_PATH, DEFAULT_DATA_PATH, DEFAULT_ENDPOINTS_PATH
label_desc: Use image node_id 4 for calling a global function with example usage: add_domain_param(parser, default) without return types