nextjs-turbopack
This skill covers Turbopack, the Rust-based incremental bundler that powers Next.js 16+ local development by default. It explains when to rely on Turbopack for faster cold starts and hot module reloading, when to fall back to webpack for compatibility, and how file-system caching cuts restart times on large projects. You'll also learn about middleware file naming changes in Next.js 16 and production bundle optimization techniques.
nextjs-turbopack explains Turbopack's role in Next.js 16+ development, when to use it over webpack, and how its incremental bundling speeds up dev workflows.
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Install
affaan-m/ECC/nextjs-turbopack · repository language: JavaScript
git clone https://github.com/affaan-m/ECC
cp -r ECC/skills/nextjs-turbopack ~/.claude/skills/nextjs-turbopacknpx skillfed install affaan-m/ECC/nextjs-turbopackFrequently asked questions
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How do you enable Turbopack in Next.js 16?
nextjs-turbopack is enabled by default in Next.js 16+ for local development. To explicitly use it, run `next dev --turbo`. If you need to disable it and fall back to webpack, use `next dev` without the flag or set `turbo: false` in your next.config.js. Turbopack uses Rust-based incremental bundling to achieve faster cold starts and hot module reloading compared to webpack.
When should you choose webpack over Turbopack in Next.js?
nextjs-turbopack works well for most projects, but webpack remains the better choice when you rely on custom webpack plugins not yet supported by Turbopack, need specific loader configurations, or encounter compatibility issues with your dependencies. You can disable Turbopack and use webpack instead by running `next dev` without the `--turbo` flag or configuring `turbo: false` in next.config.js.
How does nextjs-turbopack improve dev startup and hot reload speed?
nextjs-turbopack accelerates development through file-system caching and incremental bundling. On cold starts, Turbopack's Rust implementation processes only changed files rather than rebuilding everything, dramatically reducing startup time on large projects. Hot module reloading (HMR) and fast refresh are optimized to reflect code changes almost instantly, letting you see updates without full page reloads.
What is nextjs-turbopack incremental bundling and file-system caching?
nextjs-turbopack uses incremental bundling to rebuild only the modules you've changed, not your entire codebase. File-system caching stores intermediate build artifacts in the .next folder, so subsequent dev server restarts reuse cached results instead of reprocessing unchanged code. This combination cuts restart times significantly on projects with many dependencies or large module graphs.
How do you troubleshoot slow dev startup with nextjs-turbopack?
If nextjs-turbopack dev startup feels slow, first verify you're running `next dev --turbo` and that Turbopack is actually enabled. Clear the .next cache folder and restart the dev server. Check for large node_modules or many files in your project that might slow initial indexing. If issues persist, consider temporarily disabling Turbopack with `next dev` to isolate whether the problem is Turbopack-specific or project-wide.
Can you optimize Next.js production builds with nextjs-turbopack?
nextjs-turbopack primarily accelerates local development; production builds still use webpack by default. However, Turbopack's incremental bundling principles inform production optimization strategies. Use bundle analyzers to identify large dependencies, enable code splitting, and leverage Next.js's built-in image and font optimization. For production-specific tuning, configure next.config.js with appropriate build settings rather than relying on dev-mode Turbopack features.
SKILL.md
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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
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