✨Type checking imports for all type hints

Task

Only import type hints when TYPE_CHECKING is true.

Must be present:

from __future__ import annotations

from typing import TYPE_CHECKING

Example

from __future__ import annotations

from typing import TYPE_CHECKING
from dataclasses import dataclass


if TYPE_CHECKING:
    from typing import List


@dataclass
class Foo:
    bar: List[int] = None

[ooliver1]

Cancel that I found an option to fix that, says “expensive” but I guess it’s better than moving all imports

[ooliver1]

as seen from 769cefa7542ff6f1ddac3ddb890cb8f18fb41c02 it is in my doc branch and will be PR’d along with docs