• Build a large enough website with a large enough codebase, and you’ll eventually find that CSS presents challenges at scale. • It’s no different at Meta, which is why we open-sourced StyleX, a solution for CSS at scale. • StyleX combines the ergonomics of CSS-in-JS with the performance of static CSS. • It allows atomic styling of components while deduplicating definitions to reduce bundle size and exposes a simple API for developers. • StyleX has become the standard at companies like Figma and Snowflake. • Here at Meta,it’s the standard styling systemacross Facebook, Instagram, WhatsApp, Messenger, and Threads.

Article Summaries:

  • Meta has released StyleX, an open‑source CSS framework designed to handle large codebases. StyleX blends the convenience of CSS‑in‑JS with the speed of static CSS, enabling atomic component styling while deduplicating styles to shrink bundle size. The library is now the default styling system for Meta’s major products-Facebook, Instagram, WhatsApp, Messenger, and Threads-and is adopted by companies such as Figma and Snowflake. In a new episode of the Meta Tech Podcast, engineer Melissa, a StyleX maintainer, discusses the library’s origins, the benefits of open‑source collaboration, and how industry partners are integrating StyleX into their workflows.

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