nextjs-turbopack

To speed up Next.js dev startup and HMR, use Turbopack as the default bundler for local development in Next.js 16+. Turbopack is an incremental bundler written in Rust that significantly improves cold start and hot update speeds.

Turbopack in Next.js 16+ is an incremental bundler written in Rust that serves as the default for local development. It significantly speeds up dev startup and hot updates compared to previous webpack-based setups.

To enable Turbopack for Next.js local development, simply use the `next dev` command in a Next.js 16+ project. Turbopack is enabled by default, requiring no additional configuration for faster startup and HMR.

Next.js 16+ does support webpack for legacy dev setups by disabling Turbopack. Use the `--webpack` or `--no-turbopack` flag depending on your Next.js release to toggle behavior when hitting Turbopack bugs or relying on webpack-only plugins.

You should disable Turbopack and use webpack in Next.js when you hit a Turbopack bug or rely on a webpack-only plugin during development. Toggle this behavior using the `--webpack` or `--no-turbopack` flag.

Production build behavior using `next build` may use Turbopack or webpack depending on your specific Next.js version. You should check the official Next.js documentation for your release to verify production bundling behavior.