Jeroen Matroos refactored the build process for the nl-design-system/rvo component library, focusing on improving CSS import handling for React components. He migrated the library’s CSS processing from SCSS to native CSS, ensuring more reliable and maintainable styling imports. Using JavaScript, SCSS, and Rollup, Jeroen optimized the build pipeline to reduce build times and improve the consistency of emitted assets. He also updated project dependencies to address compatibility and security for the June 2025 release. The work prioritized build stability and release readiness, with changes documented in a changeset to support easier downstream adoption and ongoing maintainability of the library.