shadcn-cssinjs

shadcn-cssinjs is a port of shadcn/ui that swaps Tailwind CSS for StyleX, Meta's CSS-in-JS library, and builds on Base UI primitives, while still installing through the shadcn CLI. It mirrors the full component list, from accordion and data table to sidebar and Sonner toasts, with theming, RTL support, an MCP server and llms.txt for agents. The Theming page is the place to start, since it shows how a StyleX codebase picks up shadcn's tokens without Tailwind, and the project sits under Shadcn Labs.