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Compatibility

Boss CSS works anywhere you can run a Node build step or PostCSS pipeline.

Frameworks​

Boss runtime supports out of the box:

  • React, React Native, Next.js, Preact, Solid, Qwik, Stencil

Framework detection is automatic but can be overridden in config.

Any language with className​

In classname‑only mode, Boss works with any language or template system that can emit static class strings.

Build tools​

  • PostCSS (recommended for most web apps)
  • npx boss-css build / npx boss-css watch (for non‑PostCSS setups, e.g. Stencil)
  • npx boss-css compile (optional build‑time transform)

Runtime modes​

  • Inline‑first / classname‑first: server CSS + runtime for dynamic values
  • Runtime‑only: no server CSS output
  • Classname‑only: no runtime at all