lint fixes

pyserve/_wsgi_wrapper.py

@@ -11,7 +11,9 @@ The WSGI app path is passed via environment variables:
 
 import importlib
 import os
-from typing import Any, Callable
+from typing import Any, Callable, Optional
+
+WSGI_ADAPTER: Optional[str] = None
 
 try:
     from a2wsgi import WSGIMiddleware
@@ -27,7 +29,7 @@ except ImportError:
         WSGI_ADAPTER = None
 
 
-def _load_wsgi_app() -> Callable:
+def _load_wsgi_app() -> Callable[..., Any]:
     app_path = os.environ.get("PYSERVE_WSGI_APP")
     is_factory = os.environ.get("PYSERVE_WSGI_FACTORY", "0") == "1"
 
@@ -51,8 +53,9 @@ def _load_wsgi_app() -> Callable:
         raise RuntimeError(f"Module '{module_name}' has no attribute '{attr_name}'")
 
     if is_factory:
-        return app_or_factory()
-    return app_or_factory
+        result: Callable[..., Any] = app_or_factory()
+        return result
+    return app_or_factory  # type: ignore[return-value]
 
 
 def _create_asgi_app() -> Any: