$ show codegouvfr/react-dsfr
This repository is a React component library (`@codegouvfr/react-dsfr`) that provides a complete implementation of the French government's Design System (DSFR) for modern web applications. It covers nearly all DSFR UI components (buttons, forms, navigation, modals, tables, etc.) and adds framework-specific integrations for Next.js (both Pages Router and App Router), Vite, and Create React App, including SSR support without flash. The library also ships a CLI tool (`npx react-dsfr`) that performs static analysis of a project's source code to generate an optimized CSS bundle containing only the DSFR components actually used, solving a common bloat problem in design-system integrations. Additionally, it provides a GDPR consent management system, i18n per component, MUI theming compatibility, dark mode, and a large set of SVG pictograms. The architecture is a typical React library: each component is a memoized, forwardRef-wrapped functional component using DSFR CSS classes via a `cx` helper. Build-time scripts parse the DSFR CSS into TypeScript constants (spacing, colors, breakpoints, class names) to ensure type safety and ease of use. The library avoids bundling all DSFR CSS in JavaScript; instead, it relies on the CSS being loaded from `node_modules` and optionally trimmed by the CLI. Notable internal patterns include a lightweight `StatefulObservable` for reactive state, a set of stable-callback hooks (`useConst`, `useConstCallback`) to avoid unnecessary re-renders, and a factory pattern for pictograms. While not a hybrid repo, its build pipeline demonstrates a unique approach to CSS-to-TypeScript code generation. The codebase is actively maintained with a comprehensive test suite covering both runtime behavior and build-script correctness. However, it carries some technical drift: it relies on a patched version of `@gouvfr/dsfr` (1.14.2), the pictograms are large inline SVGs that must be manually updated, and the CSS optimization script uses hardcoded component mappings that could diverge from future DSFR releases. Overall, it is a high-quality, production-grade library suitable for any French public service website built with React.
The LLM identified 4 files worth highlighting for reuse:
A minimal, self-contained observable implementation used internally for consent management. It provides a `StatefulObservable` class with subscribe/unsubscribe, get/set value, and a `waitFor` method. This is a reusable pattern for lightweight reactive state without external dependencies, demonstrating clean API design and proper cleanup.
A custom React hook that returns a stable callback reference across renders, similar to `useCallback` but without requiring a dependency array. It implements a smart pattern that avoids common pitfalls of stale closures and ESLint warnings. This hook is generic, well-tested, and can be extracted into any React project to improve performance.
A CLI tool that scans a project's source code (TSX, JSX, TS, JS, MDX, HTML, Svelte, Vue) to detect which DSFR components are imported or which DSFR CSS class names are used, then rebuilds a minimal `dsfr.css` containing only the required stylesheets. It demonstrates a novel approach to reducing CSS bundle size in design-system-based applications and is structured as a standalone script that could be adapted for other CSS frameworks.
A higher-order component factory (`createPicto`) that wraps SVG group elements into a React component with consistent props (`fontSize`, `color`, `title`, `className`). It handles theming via CSS classes like `fr-artwork-minor` and allows SVG artwork to be used as first-class React components. The pattern is simple yet powerful, enabling tree-shaking and dynamic imports for a large set of pictograms.