Implement runtime-import-in-type-checking-block (TYP004) (#2146)

resources/test/fixtures/flake8_type_checking/TYP004_1.py

@@ -0,0 +1,5 @@
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from datetime import datetime
+x = datetime

resources/test/fixtures/flake8_type_checking/TYP004_2.py

@@ -0,0 +1,8 @@
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from datetime import date
+
+
+def example():
+    return date()

resources/test/fixtures/flake8_type_checking/TYP004_3.py

@@ -0,0 +1,6 @@
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from typing import Any
+
+    CustomType = Any

resources/test/fixtures/flake8_type_checking/TYP004_4.py

@@ -0,0 +1,11 @@
+from typing import TYPE_CHECKING, Type
+
+if TYPE_CHECKING:
+    from typing import Any
+
+
+def example(*args: Any, **kwargs: Any):
+    return
+
+
+my_type: Type[Any] | Any

resources/test/fixtures/flake8_type_checking/TYP004_5.py

@@ -0,0 +1,8 @@
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from typing import List, Sequence, Set
+
+
+def example(a: List[int], /, b: Sequence[int], *, c: Set[int]):
+    return

resources/test/fixtures/flake8_type_checking/TYP004_6.py

@@ -0,0 +1,10 @@
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from pandas import DataFrame
+
+
+def example():
+    from pandas import DataFrame
+
+    x = DataFrame

resources/test/fixtures/flake8_type_checking/TYP004_7.py

@@ -0,0 +1,10 @@
+from __future__ import annotations
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from typing import AsyncIterator, List
+
+
+class Example:
+    async def example(self) -> AsyncIterator[List[str]]:
+        yield 0

resources/test/fixtures/flake8_type_checking/TYP004_8.py

@@ -0,0 +1,7 @@
+from typing import TYPE_CHECKING
+from weakref import WeakKeyDictionary
+
+if TYPE_CHECKING:
+    from typing import Any
+
+d = WeakKeyDictionary["Any", "Any"]()