code: def prefix_meta(event: E) -> None:
      """
      Metafy the next character typed. This is for keyboards without a meta key.
  
      Sometimes people also want to bind other keys to Meta, e.g. 'jj'::
  
          key_bindings.add_key_binding('j', 'j', filter=ViInsertMode())(prefix_meta)
      """
      # ('first' should be true, because we want to insert it at the current
      # position in the queue.)
      event.app.key_processor.feed(KeyPress(Keys.Escape), first=True)
  
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 49 for calling a global function with example usage: prefix_meta(event) without return types