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/useClaimCharacter.ts

@@ -0,0 +1,77 @@
+import { useCallback, useState } from "react";
+import { useDispatch, useSelector } from "react-redux";
+
+import { characterSelectors } from "@dndbeyond/character-rules-engine/es";
+
+import { toastMessageActions } from "~/tools/js/Shared/actions";
+
+import {
+  claimCharacter as claimCharacterApi,
+  joinCampaign as joinCampaignApi,
+} from "../helpers/characterServiceApi";
+
+interface UseClaimCharacterProps {
+  campaignJoinCode: string | null;
+  isAssigned: boolean;
+}
+
+export const useClaimCharacter = ({
+  campaignJoinCode,
+  isAssigned,
+}: UseClaimCharacterProps) => {
+  const [isFinished, setIsFinished] = useState(false);
+  const [isLoading, setIsLoading] = useState(false);
+
+  const [newCharacterId, setNewCharacterId] = useState<number | null>(null);
+  const [campaignId, setCampaignId] = useState<number | null>(null);
+
+  const characterId = useSelector(characterSelectors.getId);
+
+  const dispatch = useDispatch();
+
+  const claimCharacter = useCallback(async () => {
+    try {
+      setIsLoading(true);
+
+      let clonedId;
+
+      const claimResponse = await claimCharacterApi(characterId, isAssigned);
+      if (claimResponse.ok) {
+        const data = await claimResponse.json();
+        clonedId = data.id;
+        setNewCharacterId(clonedId);
+      } else {
+        throw new Error(`There was an error claiming character ${characterId}`);
+      }
+
+      if (campaignJoinCode) {
+        const joinResponse = await joinCampaignApi(campaignJoinCode, clonedId);
+        if (joinResponse.ok) {
+          const data = await joinResponse.json();
+          setCampaignId(data.campaignId);
+        } else {
+          throw new Error(
+            `There was an error adding character ${clonedId} to campaign join code ${campaignJoinCode}`
+          );
+        }
+      }
+    } catch (error) {
+      console.error(error);
+
+      dispatch(
+        toastMessageActions.toastError("Error", "An unexpected error occurred.")
+      );
+    } finally {
+      setIsLoading(false);
+      setIsFinished(true);
+    }
+  }, [campaignJoinCode, characterId, dispatch, isAssigned]);
+
+  return [
+    claimCharacter,
+    isLoading,
+    isFinished,
+    newCharacterId,
+    campaignId,
+  ] as const;
+};