Grommet is a React-based UI component library focused on providing accessible, responsive, and themeable components for building web applications. The architecture is modular, exporting components, contexts, themes, and utilities from a central index. Key entry points include src/js/index.js (main export) and the component directories under src/js/components/. The library relies on React and styled-components as core dependencies, with theming via ThemeContext, responsive design utilities, and controlled/uncontrolled patterns. Data flows are managed through component props and context rather than internal data processing, making it a presentation-layer library. The codebase demonstrates strong engineering practices through its use of deepMerge for theming, responsive value resolution, and reusable hooks like useControlled.