Return type is Self when calling an inherited decorated classmethod that returns Self #19023

from __future__ import annotations

from collections.abc import Callable
from functools import wraps
from typing import Any, Self, TypeVar

type JSON = dict[str, Any]
T = TypeVar("T")


def debug(make: Callable[[type[T], JSON], T]) -> Callable[[type[T], JSON], T]:
    @wraps(make)
    def wrapper(cls: type[T], data: JSON) -> T:
        return make(cls, data)

    return wrapper


class Foo:
    data: JSON
    
    def __init__(self, data: JSON) -> None:
        self.data = data

    @classmethod
    @debug
    def make(cls, data: JSON) -> Self:
        return cls(data)


class Bar(Foo):
    pass


def test() -> Bar:
    return Bar.make({})