The following Black'd (23.*) code:

JSONSerializable: TypeAlias = (
    "str | int | float | bool | None | list | tuple | JSONMapping"
)

is converted by ruff format (0.1.2) into:

JSONSerializable: (
    TypeAlias
) = "str | int | float | bool | None | list | tuple | JSONMapping"

Pretty sure that's not intentional? Wrapping on the type hint looks terrible, IMO. :)

PS: While Black produces the code on the top, it will not rewrite the code on the bottom into the top.