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/config/index.ts

@@ -0,0 +1,8 @@
+import * as navigationConfig from "./navigation";
+
+export const BUILDER_DESKTOP_COMPONENT_START_WIDTH = 768;
+export const BUILDER_MQ_IS_MOBILE_SIZE = `(max-width: ${
+  BUILDER_DESKTOP_COMPONENT_START_WIDTH - 1
+}px)`;
+
+export { navigationConfig };