code: def has_validation_error() -> bool:
      "Current buffer has validation error."
      return get_app().current_buffer.validation_error is not None
  
imports: from __future__ import annotations
  from typing import TYPE_CHECKING, cast
  from prompt_toolkit.application.current import get_app
  from prompt_toolkit.cache import memoized
  from prompt_toolkit.enums import EditingMode
  from .base import Condition
label_desc: Use image node_id 9 for calling a global function with example usage: has_validation_error() and returns: unknown