use default serializeVisitorKeyCookie for example

example/flags/config.ts

@@ -13,8 +13,7 @@ export const config: Configuration<AppFlags> = {
   // You can just delete this line in your own application.
   // It's only here because we use it while working on @happykit/flags itself.
   endpoint: process.env.NEXT_PUBLIC_FLAGS_ENDPOINT,
-  serializeVisitorKeyCookie: (visitorKey) => {
-    console.log("serializedVisitorKeyCookie called", visitorKey);
-    return null;
-  },
+
+  // You can uncomment this if you do not want to set the visitorKey cookie
+  // serializeVisitorKeyCookie: () => null,
 };