from typing import Any, Callable, Hashable, List, Optional, SupportsInt, Tuple, TypeVar, Union

_TypeT = TypeVar("_TypeT", bound=type)
_Reduce = Union[Tuple[Callable[..., _TypeT], Tuple[Any, ...]], Tuple[Callable[..., _TypeT], Tuple[Any, ...], Optional[Any]]]

__all__: List[str]

def pickle(
    ob_type: _TypeT,
    pickle_function: Callable[[_TypeT], Union[str, _Reduce[_TypeT]]],
    constructor_ob: Optional[Callable[[_Reduce[_TypeT]], _TypeT]] = ...,
) -> None: ...
def constructor(object: Callable[[_Reduce[_TypeT]], _TypeT]) -> None: ...
def add_extension(module: Hashable, name: Hashable, code: SupportsInt) -> None: ...
def remove_extension(module: Hashable, name: Hashable, code: int) -> None: ...
def clear_extension_cache() -> None: ...