nextjs-turbopack
Next.js and Turbopack
Next.js 16+ uses Turbopack by default for local development: an incremental bundler written in Rust that significantly speeds up dev startup and hot updates.
When to Use
- Turbopack (default dev): Use for day-to-day development. Faster cold start and HMR, especially in large apps.
- Webpack (legacy dev): Use only if you hit a Turbopack bug or rely on a webpack-only plugin in dev. Disable with
--webpack(or--no-turbopackdepending on your Next.js version; check the docs for your release). - Production: Production build behavior (
next build) may use Turbopack or webpack depending on Next.js version; check the official Next.js docs for your version.
Use when: developing or debugging Next.js 16+ apps, diagnosing slow dev startup or HMR, or optimizing production bundles.
How It Works
- Turbopack: Incremental bundler for Next.js dev. Uses file-system caching so restarts are much faster (e.g. 5–14x on large projects).
- Default in dev: From Next.js 16,
next devruns with Turbopack unless disabled. - File-system caching: Restarts reuse previous work; cache is typically under
.next; no extra config needed for basic use. - Bundle Analyzer (Next.js 16.1+): Experimental Bundle Analyzer to inspect output and find heavy dependencies; enable via config or experimental flag (see Next.js docs for your version).
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