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/base/utils/isHostComponent.js

@@ -0,0 +1,6 @@
+/**
+ * Determines if a given element is a DOM element name (i.e. not a React component).
+ */
+export function isHostComponent(element) {
+  return typeof element === 'string';
+}