devup-ui

Zero-runtime CSS-in-JS for React is achieved by using Devup UI primitives like Box, Flex, and Text alongside styling APIs to compile JSX styles into static CSS at build time, eliminating runtime style evaluation overhead.

Compile-time CSS extraction integrates seamlessly with Vite, Next.js, Webpack, Rsbuild, and Bun build pipelines through a dedicated build plugin, ensuring static CSS generation during the build process.

Build-time CSS extraction is a process that transforms JSX styles into static CSS files during compilation. It prevents runtime overhead by using placeholder components that throw on runtime to stop accidental style computation in the browser.

You can use keyframes and global CSS with zero-runtime styling by utilizing the provided styling APIs, which are extracted at build time alongside component styles to generate static CSS without runtime evaluation.

Placeholder components throw errors at runtime to strictly enforce a true zero-runtime pipeline, preventing any accidental style computation from executing in the browser and ensuring all CSS remains static.

The best way to eliminate runtime CSS overhead is adopting compile-time CSS extraction with Devup UI primitives. This approach shifts style generation to the build phase, ensuring true zero-runtime styling for React.