from typing import Callable, TypeVar, overload
from . import _ConverterType
_T = TypeVar("_T")
def pipe(*validators: _ConverterType) -> _ConverterType: ...
def optional(converter: _ConverterType) -> _ConverterType: ...
@overload
def default_if_none(default: _T) -> _ConverterType: ...
@overload
def default_if_none(*, factory: Callable[[], _T]) -> _ConverterType: ...
def to_bool(val: str) -> bool: ...