Grabbed dndbeyond's source code

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

ddb_main/tools/js/CharacterBuilder/containers/CharacterBuilderContainer/CharacterBuilderContainer.tsx

@@ -0,0 +1,38 @@
+import { useLayoutEffect } from "react";
+
+import { BuilderProvider } from "~/subApps/builder/contexts/Builder";
+
+import ErrorBoundary from "../../../Shared/components/ErrorBoundary";
+import CharacterBuilder from "../CharacterBuilder";
+
+export function CharacterBuilderContainer(props) {
+  useLayoutEffect(() => {
+    document
+      .getElementsByTagName("body")[0]
+      .classList.add(
+        "site",
+        "body-rpgcharacterbuilder",
+        "site-dndbeyond",
+        "body-rpgcharacter"
+      );
+    return () => {
+      document
+        .getElementsByTagName("body")[0]
+        .classList.remove(
+          "site",
+          "body-rpgcharacterbuilder",
+          "site-dndbeyond",
+          "body-rpgcharacter"
+        );
+    };
+  }, []);
+  return (
+    <BuilderProvider>
+      <ErrorBoundary>
+        <CharacterBuilder />
+      </ErrorBoundary>
+    </BuilderProvider>
+  );
+}
+
+export default CharacterBuilderContainer;

ddb_main/tools/js/CharacterBuilder/containers/CharacterBuilderContainer/index.ts

@@ -0,0 +1,4 @@
+import CharacterBuilderContainer from "./CharacterBuilderContainer";
+
+export default CharacterBuilderContainer;
+export { CharacterBuilderContainer };