fix: use anyio.Event for _stop_event in non-pyodide environments

Author: CNSeniorious000

packages/hmr/reactivity/hmr/core.py

@@ -347,8 +347,10 @@ def keep_watching_until_interrupt(self):
 class AsyncReloader(BaseReloader):
     @cached_property
     def _stop_event(self):
-        from asyncio import Event
-
+        if sys.platform == "emscripten":
+            from asyncio import Event
+        else:
+            from anyio import Event
         return Event()
 
     def stop_watching(self):