SMRTR ProgrammingJan 12, 2026Facebook Engineering

CSS at Scale With StyleX

SMRTR summary

Meta open-sourced StyleX, a CSS-at-scale solution that combines CSS-in-JS ergonomics with static CSS performance. The tool enables atomic component styling while deduplicating definitions to reduce bundle sizes. StyleX has been adopted by major companies like Figma and Snowflake, and serves as the standard styling system across Meta's platforms including Facebook, Instagram, WhatsApp, Messenger, and Threads.

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

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