Grabbed dndbeyond's source code

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

ddb_main/node_modules/@mui/utils/useForkRef/useForkRef.js

@@ -0,0 +1,22 @@
+'use client';
+
+import * as React from 'react';
+import setRef from '../setRef';
+export default function useForkRef(...refs) {
+  /**
+   * This will create a new function if the refs passed to this hook change and are all defined.
+   * This means react will call the old forkRef with `null` and the new forkRef
+   * with the ref. Cleanup naturally emerges from this behavior.
+   */
+  return React.useMemo(() => {
+    if (refs.every(ref => ref == null)) {
+      return null;
+    }
+    return instance => {
+      refs.forEach(ref => {
+        setRef(ref, instance);
+      });
+    };
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, refs);
+}