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/generateUtilityClasses/generateUtilityClasses.js

@@ -0,0 +1,8 @@
+import generateUtilityClass from '../generateUtilityClass';
+export default function generateUtilityClasses(componentName, slots, globalStatePrefix = 'Mui') {
+  const result = {};
+  slots.forEach(slot => {
+    result[slot] = generateUtilityClass(componentName, slot, globalStatePrefix);
+  });
+  return result;
+}