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/react-transition-group/esm/utils/reflow.js

@@ -0,0 +1,3 @@
+export var forceReflow = function forceReflow(node) {
+  return node.scrollTop;
+};