devup-ui

Zero-runtime CSS-in-JS preprocessor for React. Transforms JSX styles to static CSS at build time. TRIGGER WHEN: - Writing/modifying Devup UI components (Box, Flex, Grid, Text, Button, etc.) - Using styling APIs: css(), globalCss(), keyframes() - Configuring devup.json theme (colors, typography, length, shadow, extends) - Setting up build plugins (Vite, Next.js, Webpack, Rsbuild, Bun) - Debugging "Cannot run on the runtime" errors - Working with responsive arrays, pseudo-selectors (_hover, _dark, etc.) - Using polymorphic `as` prop or `selectors` prop - Working with @devup-ui/components (Button, Input, Select, Toggle, etc.) - Using responsive length tokens ($containerX, $gutter) or shadow tokens ($card, $sm)