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nextjs-upgrade

Next.js version migrations using official guides and codemods. Use when migrating a Next.js project to a new major version using codemods.

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  • SKILL.md2.4 KB
  • evals/evals.json2.2 KB
  • references/example.md197 B

SKILL.md(原文)

インストールする前に、エージェントに与えられる指示の中身を確認できます。

Next.js Upgrade Protocol

Automated and manual migration steps for Next.js version upgrades (e.g., v14 to v15).

Priority: P1 (HIGH)

Workflow: Upgrade Next.js to New Major Version

  1. Check current versions of next, react, react-dom in package.json
  2. Plan incremental path (e.g., v13 -> v14 -> v15; never skip majors)
  3. Run codemods: npx @next/codemod@latest <transform> <path>
  4. Update dependencies: See implementation examples
  5. Verify async APIs: ensure cookies(), headers(), params awaited (v15+)
  6. Audit fetch caching: v15 defaults to no-store; add force-cache where needed
  7. Run next build and fix hydration or Turbopack errors
  8. Report codemod failures or manual fixes to team

Implementation Guidelines

  • Upgrade Detection: Always check package.json for versions of next, react, and react-dom.
  • Planning: For major version jumps (v13 to v15), perform incremental upgrade (v13 -> v14, then v14 -> v15). Follow official Next.js Migration Guides.
  • Automated Codemods: Use npx @next/codemod@latest <transform> <path> to automate syntax migration.
  • Breaking Changes (v15): Respond to next-async-request-api transform by ensuring params, searchParams, cookies(), and headers() awaited.
  • React Parity: Upgrade react and react-dom to match Next.js peer dependencies (e.g., React 19 for Next.js 15).
  • Validation: Run next dev and next build after each incremental step. Check console errors for hydration warnings.

Anti-Patterns

  • No major version skipping: Upgrade one major version at time (13 -> 14, then 14 -> 15).
  • No manual breaking-change fixes: Always run npx @next/codemod@latest transforms first.
  • No assumed caching behavior post-upgrade: v15 defaults to no-store; audit all fetch calls.
  • No async page functions in Pages Router: export default async function Page() fatal.

Canonical response anchors

When this skill applies, preserve the following domain terminology or equivalent concrete examples in the answer when relevant:

  • incremental
  • one major

レビュー

まだレビューはありません。使ってみた感想をお寄せください。

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