Starlight

Starlight is a full-featured documentation website framework built on top of the Astro web framework, developed by the Astro team led by Matthew Phillips and Fred K. Schott. The framework provides everything needed to build production-grade documentation sites out of the box, including site navigation with sidebar and breadcrumb components, full-text search powered by Pagefind, internationalization with multi-language support and automatic locale routing, search engine optimization with automatic sitemap generation and structured data, readable typography with configurable font stacks, syntax-highlighted code blocks with copy buttons, dark mode with system preference detection, accessibility features including keyboard navigation and screen reader support, and table of contents generation. Content is authored in Markdown, MDX, or Markdoc with built-in frontmatter validation through TypeScript type-safety, ensuring that required fields like title and description are present and correctly typed. Starlight is framework-agnostic for custom components, allowing developers to extend the documentation with interactive React, Vue, Svelte, or Solid components through Astro islands architecture. The framework supports versioned documentation, draft content, pagination, and custom 404 pages. Configuration is handled through a single astro.config.mjs file with strongly typed options. The project is used by Cloudflare for their Workers documentation, Cloudflare Pages, PartyKit, Vendia, and hundreds of open-source projects. Starlight is open source under the MIT license.