code: def add_domain(
      self, domain: type[Domain], override: bool = False
  ) -> None:
      logger.debug("[app] adding domain: %r", domain)
      if domain.name in self.domains and not override:
          raise ExtensionError(
              __("domain %s already registered") % domain.name
          )
      self.domains[domain.name] = domain
  
imports: from __future__ import annotations
  import sys
  import traceback
  from importlib import import_module
  from types import MethodType
  from typing import TYPE_CHECKING, Any, Callable
  from sphinx.domains import Domain, Index, ObjType
  from sphinx.domains.std import GenericObject, Target
  from sphinx.errors import ExtensionError, SphinxError, VersionRequirementError
  from sphinx.extension import Extension
  from sphinx.io import create_publisher
  from sphinx.locale import __
  from sphinx.parsers import Parser
  from sphinx.roles import XRefRole
  from sphinx.util import logging
  from sphinx.util.logging import prefixed_warnings
label_desc: Use image node_id 5 for calling the SphinxComponentRegistry obj's underlying member method code with example usage: obj.add_domain(domain, override) without return types