class_docstr: A style that doesn't style anything.
class_docstr_tok: ["A","style","that","does","n't","style","anything","."]
code: def invalidation_hash(self) -> Hashable:
      return 1
  
imports: from __future__ import annotations
  from abc import ABCMeta, abstractmethod, abstractproperty
  from typing import Callable, Hashable, NamedTuple
label_desc: Use image node_id 2 for calling the DummyStyle obj's underlying member method code with example usage: obj.invalidation_hash() and returns: int