nextjs-turbopack

Guidance for developing and debugging Next.js 16 or newer applications with Turbopack. Turbopack is Next.js's incremental development bundler, which prepares application code and can reuse cached work.

In plain words
What is it for?
Use it to troubleshoot slow development startup or hot updates, choose between Turbopack and webpack, and review development or production bundling choices.
Why use it?
It explains when to use the default Turbopack development setup, when to fall back to webpack, and how development caching affects startup and file updates. Production build behavior may depend on the Next.js version.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/arogyareddy/https-github.com-affaan-m-everything-claude-code1/nextjs-turbopack
Any agent
npx skills add ArogyaReddy/https-github.com-affaan-m-everything-claude-code1 --skill nextjs-turbopack
Clone the repo
git clone --depth 1 https://github.com/ArogyaReddy/https-github.com-affaan-m-everything-claude-code1

Made for: Claude Code, Codex.

Per session 39 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 521 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 98% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00039 $0.00521
Opus 5 $0.00019 $0.00260
Sonnet 5 $0.00008 $0.00104
Haiku 4.5 $0.00004 $0.00052

Measured 2d ago against content hash f65da15aabeb, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

nextjs-turbopack scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

98% identical to nextjs-turbopack — 1 line differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.agents/skills/nextjs-turbopack/SKILL.md · 45 lines

What it actually says

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-turbopack depending 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 dev runs 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).

Examples

Commands

next dev
next build
next start

Usage

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

Best Practices

  • Stay on a recent Next.js 16.x for stable Turbopack and caching behavior.
  • If dev is slow, ensure you're on Turbopack (default) and that the cache isn't being cleared unnecessarily.
  • For production bundle size issues, use the official Next.js bundle analysis tooling for your version.
Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 45 lines · 39 tokens per session scan A f65da15aabeb

Subscribe to this mod's changes

nextjs-turbopack is a skill published in the GitHub repository ArogyaReddy/https-github.com-affaan-m-everything-claude-code1 (2 stars, last pushed 4mo ago), licensed MIT. It adds 39 tokens to every session and 521 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 98% identical to nextjs-turbopack, differing in 1 line, and is treated as a copy.

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