from typing import Awaitable, Callable, ParamSpec, TypeVar P = ParamSpec("P") R = TypeVar("R") def add_logging(f: Callable[P, R]) -> Callable[P, Awaitable[R]]: async def inner(*args: P.args, **kwargs: P.kwargs) -> R: await log_to_database() return f(*args, **kwargs) return inner @add_logging def takes_int_str(x: int, y: str) -> int: return x + 7 await takes_int_str(1, "A") # Accepted await takes_int_str("B", 2) # Correctly rejected by the type checker