How to fix this Unknown issue?

[Mikaël Capelle (Holt59)]

Is want to create type-guard function to check that an object is a list of X, currently I have:

from typing import Any

class Function: ...

def is_list_of_functions(e: Any) -> TypeIs[list[Function]]:
    if not isinstance(e, list):
        return False
    return all(isinstance(x, Function) for x in e)

With latest pyright, I am getting

code.py
  code.py:15:44 - error: Type of "x" is unknown (reportUnknownVariableType)
1 error, 0 warnings, 0 informations

Is there a clean way to avoid that error aside from ignoring it with a ignore comment?

[Savio Mak (Glinte)]

https://microsoft.github.io/pyright/#/configuration?id=diagnostic-settings-defaults:~:text=reportUnknownVariableType%20%5Bboolean%20or%20string%2C%20optional%5D
This diagnostic is disabled by default. I would just use # pyright: ignore[reportUnknownVariableType] on that line since it is obvious that x being Unknown is intended