1  from typing import Any, NewType, NoReturn, TypeVar, cast
 2  
 3  from . import Attribute, _OnSetAttrType
 4  
 5  _T = TypeVar("_T")
 6  
 7  def frozen(
 8      instance: Any, attribute: Attribute[Any], new_value: Any
 9  ) -> NoReturn: ...
10  def pipe(*setters: _OnSetAttrType) -> _OnSetAttrType: ...
11  def validate(instance: Any, attribute: Attribute[_T], new_value: _T) -> _T: ...
12  
13  # convert is allowed to return Any, because they can be chained using pipe.
14  def convert(
15      instance: Any, attribute: Attribute[Any], new_value: Any
16  ) -> Any: ...
17  
18  _NoOpType = NewType("_NoOpType", object)
19  NO_OP: _NoOpType