fix: sort out generics issue

Author: yt-ms

src/structurizr/view/view_set.py

@@ -17,7 +17,7 @@
 
 
 from itertools import chain
-from typing import TYPE_CHECKING, Iterable, List, Optional
+from typing import TYPE_CHECKING, Iterable, List, Optional, TypeVar
 
 from pydantic import Field
 
@@ -42,6 +42,8 @@
 
 __all__ = ("ViewSet", "ViewSetIO")
 
+T = TypeVar("T")
+
 
 class ViewSetIO(BaseModel):
     """
@@ -379,5 +381,5 @@ def _ensure_key_is_specific_and_unique(self, key: str) -> None:
         if key in self._views:
             raise ValueError(f"View already exists in workspace with key '{key}'.")
 
-    def _get_typed_views(self, klass: "T") -> Iterable["T"]:
+    def _get_typed_views(self, klass: T) -> Iterable[T]:
         return (view for view in self._views.values() if isinstance(view, klass))