Given the following snippet, ruff should not throw an error. At least this is the behavior of pyupgrade.

There are cases where one still needs an explicit Optional. See fastapi/typer#348 / fastapi/typer#348 (comment) for an example.

Code

from __future__ import annotations

from typing import Optional

StrOrNone = Optional[str]

Output

up007.py:6:13: UP007 [*] Use `X | Y` for type annotations
Found 1 error.