Andy focused on enhancing asset URL handling within the TanStack/router repository, delivering a targeted feature that improved manifest construction reliability. By replacing path.join with joinURL for joining JavaScript entries, Andy addressed compatibility issues in asset loading and standardized URL logic to reduce the risk of resolution failures. The work involved isolating manifest-generation logic, which supports easier maintenance and future enhancements. Using TypeScript and full stack development skills, Andy also strengthened integration with downstream tooling to ensure consistent asset loading across the build pipeline. The contribution demonstrated thoughtful engineering depth, laying groundwork for future improvements in manifest tooling and plugin alignment.