fix: add missing annotation (#1483)

Author: symonk

playwright/_impl/_sync_base.py

@@ -16,7 +16,19 @@
 import inspect
 import traceback
 from types import TracebackType
-from typing import Any, Awaitable, Callable, Dict, Generic, List, Type, TypeVar, cast
+from typing import (
+    Any,
+    Callable,
+    Coroutine,
+    Dict,
+    Generator,
+    Generic,
+    List,
+    Type,
+    TypeVar,
+    Union,
+    cast,
+)
 
 import greenlet
 
@@ -75,10 +87,13 @@ def __init__(self, impl_obj: Any) -> None:
     def __str__(self) -> str:
         return self._impl_obj.__str__()
 
-    def _sync(self, coro: Awaitable) -> Any:
+    def _sync(
+        self,
+        coro: Union[Coroutine[Any, Any, Any], Generator[Any, Any, Any]],
+    ) -> Any:
         __tracebackhide__ = True
         g_self = greenlet.getcurrent()
-        task = self._loop.create_task(coro)
+        task: asyncio.tasks.Task[Any] = self._loop.create_task(coro)
         setattr(task, "__pw_stack__", inspect.stack())
         setattr(task, "__pw_stack_trace__", traceback.extract_stack())