Nextjs turbopack

Skill Lukk17/agent-standards/.agents/skills/nextjs-turbopack

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Install

npx -y skills add Lukk17/agent-standards --skill nextjs-turbopack

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Next.js 16+ and Turbopack: incremental bundling, FS caching, dev speed, and when to use Turbopack vs webpack.

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 starts and HMR, especially in large applications.
Webpack (legacy dev): Use only if you hit a Turbopack bug or rely on a webpack-specific plugin in dev. Disable it with --webpack (or --no-turbopack depending on your Next.js version; check the docs for your version).
Production: Production build behavior (next build) may use Turbopack or webpack depending on the Next.js version; check the official Next.js documentation for your version.

Use this when developing or debugging Next.js 16+ applications, diagnosing slow dev startup or HMR, or optimizing production bundles.

How it works

Turbopack: The incremental bundler for Next.js dev. It uses a file system cache, so restarts are much faster (for example, 5-14x in large projects).
Default in dev: From Next.js 16 onward, next dev runs with Turbopack unless it is disabled.
File system cache: Restarts reuse previous work; the cache is usually under .next, and no extra configuration is needed for basic use.
Bundle Analyzer (Next.js 16.1+): An experimental Bundle Analyzer for inspecting the output and finding heavy dependencies; enable it via config or an experimental flag (see the Next.js documentation for your version).

Examples

Commands

To run local development with Turbopack:

next dev

To create a production build:

next build

To start the production server after building:

next start

Usage

Run next dev for local development with Turbopack. Use the Bundle Analyzer to optimize code-splitting and trim large dependencies (see the Next.js documentation). Prefer the App Router and server components where possible.

Best practices

Stay on a current Next.js 16.x version for stable Turbopack and caching behavior.
If dev is slow, make sure you are on Turbopack (the default) and that the cache is not being cleared unnecessarily.
For production bundle size issues, use the official Next.js bundle analysis tools for your version.