code: def register(name: str) -> Callable[[_T], _T]:
      """
      Store handler in the `_readline_commands` dictionary.
      """
  
      def decorator(handler: _T) -> _T:
          "`handler` is a callable or Binding."
          if isinstance(handler, Binding):
              _readline_commands[name] = handler
          else:
              _readline_commands[name] = key_binding()(
                  cast(_Handler, handler)
              )
  
          return handler
  
      return decorator
  
imports: from __future__ import annotations
  from typing import Callable, TypeVar, Union, cast
  from prompt_toolkit.document import Document
  from prompt_toolkit.enums import EditingMode
  from prompt_toolkit.key_binding.key_bindings import Binding, key_binding
  from prompt_toolkit.key_binding.key_processor import KeyPress, KeyPressEvent
  from prompt_toolkit.keys import Keys
  from prompt_toolkit.layout.controls import BufferControl
  from prompt_toolkit.search import SearchDirection
  from prompt_toolkit.selection import PasteMode
  from .completion import display_completions_like_readline, generate_completions
label_desc: Use image node_id 1 for calling a global function with example usage: register(name) and returns: decorator, handler