Syntect‑js ports the high‑performance Rust syntax‑highlighting library **Syntect** to the Node.js ecosystem and browsers via WebAssembly. It lets developers generate CSS classes from TextMate `.tmTheme` files and highlight source code with language‑aware token classes, enabling fast, theme‑switchable highlighting without inline styles. The package is aimed at web developers building tools, documentation sites, or editors that need server‑side or client‑side code highlighting with minimal runtime overhead.