StyleX Has a Free API You Should Know About

StyleX is Meta's CSS-in-JS solution that powers Facebook and Instagram. It combines the DX of CSS-in-JS with zero-runtime performance through build-time extraction and atomic CSS output. Why Meta Built StyleX Meta needed CSS for 100+ engineers working on the same codebase. CSS Modules didn't scale. Runtime CSS-in-JS was too slow. StyleX compiles styles at build time into deduplicated atomic CSS — used at Meta's scale since 2021. Key Features: Zero Runtime — Styles compile to atomic CSS at build time Deterministic Resolution — Last style always wins, no specificity issues Type-Safe — Full TypeScript support Optimized Output — Atomic CSS means minimal bundle size Dead Code Elimination — Unused styles automatically removed Quick Start npm install @stylexjs/stylex @stylexjs/babel-plugin import * as stylex from " @stylexjs/stylex " const styles = stylex . create ({ button : { backgroundColor : " #3b82f6 " , color : " white " , padding : " 12px 24px " , borderRadius : 8 , " :hover " : { back