Grabbed dndbeyond's source code

```
~/go/bin/sourcemapper -output ddb -jsurl https://media.dndbeyond.com/character-app/static/js/main.90aa78c5.js
```

ddb_main/hooks/useSubscriptionTier.ts

@@ -0,0 +1,26 @@
+import { useState, useEffect } from "react";
+
+import { getSubscriptionTier } from "../helpers/userApi";
+
+export const FREE_TIER = "free";
+export const HERO_TIER = "hero";
+export const MASTER_TIER = "master";
+export const LEGENDARY_TIER = "legendary";
+
+const useSubscriptionTier = (defaultSubscription?: string) => {
+  const [subscriptionTier, setSubscriptionTier] = useState<string | undefined>(
+    defaultSubscription
+  );
+
+  useEffect(() => {
+    getSubscriptionTier().then((tier) => {
+      if (tier) {
+        setSubscriptionTier(tier as unknown as string);
+      }
+    });
+  }, []);
+
+  return (subscriptionTier || FREE_TIER).toLowerCase();
+};
+
+export default useSubscriptionTier;