devup-ui — routing-first zero-runtime CSS-in-JS adoption

Keyword: devup-ui · @devup-ui/react · zero runtime · build-time CSS extraction · devup.json

Devup UI processes all styles at build time with a Rust-powered preprocessor. There is no runtime style engine: pick the matching bundler plugin first, then write styles; the plugin is what makes everything else work.

Devup UI removes the developer-experience vs. performance trade-off of traditional CSS-in-JS by extracting styles at compile time:

• Zero Runtime — no JavaScript executes for styling at runtime
• Zero Config / Zero FOUC — no client Provider, no style flash
• Complete syntax coverage — variables, conditionals, responsive arrays, pseudo selectors
• Familiar API — styled() compatible with styled-components / Emotion patterns
• Smallest bundle — base-37 class names (a, b, … aa, ab); dynamic values become CSS variables
• RSC support — works inside React Server Components

When to use this skill