re: #275 fixed python 3.9 compatibility

Author: JoachimCoenen

src/watchdog/observers/inotify_move_event_grouper.py

@@ -9,11 +9,14 @@
 from __future__ import annotations
 
 import logging
-from typing import TypeAlias, NamedTuple
+from typing import TYPE_CHECKING, NamedTuple, Union
 
 from watchdog.observers.inotify_c import InotifyEvent
 from watchdog.utils.delayed_queue import DelayedQueue
 
+if TYPE_CHECKING:
+    from typing import TypeAlias
+
 logger = logging.getLogger(__name__)
 
 
@@ -23,7 +26,7 @@ class PathedInotifyEvent(NamedTuple):
     path: bytes
 
 
-GroupedInotifyEvent: TypeAlias = PathedInotifyEvent | tuple[PathedInotifyEvent, PathedInotifyEvent]
+GroupedInotifyEvent: TypeAlias = Union[PathedInotifyEvent | tuple[PathedInotifyEvent, PathedInotifyEvent]]
 
 
 class InotifyMoveEventGrouper: