About this project

Theme UI is a library for building consistent, themeable React applications based on constraint-based design principles. It centers on a theme specification that defines colors, typography, spacing, and other design tokens, which components consume to produce consistent styling. The library provides styled components and a `sx` prop for applying styles directly in JSX, with support for responsive arrays and object syntax. It includes color mode support, allowing light and dark themes to be switched at runtime. Theme UI also offers a set of primitive components and utilities for composing design systems, and integrates with popular tools such as Gatsby, Next.js, and MDX. Key capabilities evidenced by the repository include: - A theme specification for design tokens and scales - Styled components and the `sx` prop for styling - Responsive styles via arrays and breakpoints - Color modes and theming - Primitive UI components - Integration with frameworks and static site generators The project is organized as a monorepo under the `packages/` directory, with the main package documented in `packages/theme-ui/README.md`. It is intended for developers building React-based design systems and component libraries who want a constraint-driven approach to styling.