SMRTR ProgrammingNov 11, 2025Facebook Engineering

StyleX: A Styling Library for CSS at Scale

SMRTR summary

Meta's StyleX is an open-source CSS styling system that combines the developer experience of CSS-in-JS with the performance of static CSS by compiling styles at build time into atomic classes. The system reduces CSS bundle sizes by up to 80% through deduplication and has become the standard across Meta products like Facebook, Instagram, and WhatsApp, as well as external companies like Figma and Snowflake.

SMRTR provides this summary for quick context. The original article belongs to Facebook Engineering.

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