Specify promise type

src/components/api/PrivateRoute/PrivateRoute.tsx

@@ -23,11 +23,12 @@ export const PrivateRoute = ({
   const [loading, setLoading] = useState<boolean>(false);
 
   useEffect(() => {
-    const fetch = async (): Promise<any> => {
+    const fetch = async (): Promise<unknown> => {
       const result = await axios('/api/web/login/is_authenticated');
       // FIX: Remove negation and use true server data
       setAuth(!result.data.is_authenticated);
       setLoading(true);
+      return null;
     };
 
     fetch();