B2B-88: add starter kit structure and elements

packages/supabase/src/hooks/use-user.ts

@@ -0,0 +1,35 @@
+import type { User } from '@supabase/supabase-js';
+
+import { useQuery } from '@tanstack/react-query';
+
+import { useSupabase } from './use-supabase';
+
+const queryKey = ['supabase:user'];
+
+export function useUser(initialData?: User | null) {
+  const client = useSupabase();
+
+  const queryFn = async () => {
+    const response = await client.auth.getUser();
+
+    // this is most likely a session error or the user is not logged in
+    if (response.error) {
+      return undefined;
+    }
+
+    if (response.data?.user) {
+      return response.data.user;
+    }
+
+    return Promise.reject(new Error('Unexpected result format'));
+  };
+
+  return useQuery({
+    queryFn,
+    queryKey,
+    initialData,
+    refetchInterval: false,
+    refetchOnMount: false,
+    refetchOnWindowFocus: false,
+  });
+}