Experiment

src/textual/_compositor.py

@@ -26,12 +26,12 @@ from . import errors
 from ._cells import cell_len
 from ._loop import loop_last
 from .strip import Strip
-from ._typing import TypeAlias
 from .geometry import NULL_OFFSET, Offset, Region, Size
 
 
 if TYPE_CHECKING:
     from .widget import Widget
+    from typing import TypeAlias
 
 
 class ReflowResult(NamedTuple):
@@ -59,7 +59,7 @@ class MapGeometry(NamedTuple):
 
 
 # Maps a widget on to its geometry (information that describes its position in the composition)
-CompositorMap: TypeAlias = "dict[Widget, MapGeometry]"
+CompositorMap: TypeAlias = dict[Widget, MapGeometry]
 
 
 @rich.repr.auto(angular=True)

src/textual/_typing.py

@@ -1,5 +1,8 @@
 import sys
 
+from typing import TYPE_CHECKING
+
+
 if sys.version_info >= (3, 10):
     from typing import TypeAlias
 else:  # pragma: no cover
@@ -8,7 +11,13 @@ else:  # pragma: no cover
 if sys.version_info >= (3, 8):
     from typing import Final, Literal, Protocol, TypedDict, runtime_checkable
 else:
-    from typing_extensions import Final, Literal, Protocol, TypedDict, runtime_checkable
+    from typing_extensions import (
+        Final,
+        Literal,
+        Protocol,
+        TypedDict,
+        runtime_checkable,
+    )
 
 __all__ = [
     "Final",