scaffold-nextjs-app

pjt222

更新日 2 days ago

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メタreactapi

について

このスキルは、App RouterとTypeScriptを使用した新しいNext.jsアプリケーションを、現代的でプロダクション対応のデフォルト設定で構築します。フルスタックまたはフロントエンドWebアプリケーション向けに、プロジェクト構造、ルーティング、初期設定を整えます。サーバーサイドレンダリングやAPIルートを必要とするプロジェクトを迅速に立ち上げるためにご利用ください。

クイックインストール

Claude Code

推奨

メイン

npx skills add pjt222/agent-almanac -a claude-code

プラグインコマンド代替

/plugin add https://github.com/pjt222/agent-almanac

Git クローン代替

git clone https://github.com/pjt222/agent-almanac.git ~/.claude/skills/scaffold-nextjs-app

このコマンドをClaude Codeにコピー＆ペーストしてスキルをインストールします

ドキュメント

Scaffold Next.js App

Create a new Next.js application with App Router, TypeScript, and production-ready defaults.

When to Use

Starting a new web application
React frontend with server-side rendering
Full-stack application with API routes
TypeScript web project

Inputs

Required: Application name
Required: Package manager preference (npm, yarn, pnpm)
Optional: Include Tailwind CSS (default: yes)
Optional: Include ESLint (default: yes)
Optional: src/ directory structure (default: yes)

Procedure

Step 1: Create Project

npx create-next-app@latest my-app \
  --typescript \
  --tailwind \
  --eslint \
  --app \
  --src-dir \
  --import-alias "@/*"

Answer prompts or use flags to set all options non-interactively.

Got: Project directory created with all dependencies installed.

If fail: Check Node.js version (node --version, must be >= 18.17). Ensure npx is available. If the command hangs on prompts, add --use-npm (or --use-pnpm/--use-yarn) to skip the package manager prompt.

Step 2: Verify Project Structure

my-app/
├── src/
│   ├── app/
│   │   ├── layout.tsx        # Root layout
│   │   ├── page.tsx          # Home page
│   │   ├── globals.css       # Global styles
│   │   └── favicon.ico
│   └── lib/                  # Shared utilities (create manually)
├── public/                   # Static assets
├── next.config.ts            # Next.js configuration
├── tailwind.config.ts        # Tailwind configuration
├── tsconfig.json             # TypeScript configuration
├── package.json
└── .eslintrc.json

Got: All listed directories and files present.

If fail: If src/ is missing, the --src-dir flag was not passed. Re-run create-next-app with the flag, or move files into src/app/ manually.

Step 3: Configure Next.js

Edit next.config.ts:

import type { NextConfig } from "next";

const nextConfig: NextConfig = {
  // Enable React strict mode
  reactStrictMode: true,

  // Image optimization domains
  images: {
    remotePatterns: [
      {
        protocol: "https",
        hostname: "example.com",
      },
    ],
  },
};

export default nextConfig;

Got: next.config.ts saved without TypeScript errors.

If fail: If file uses .js instead of .ts, rename it. Ensure NextConfig type is imported from "next".

Step 4: Set Up Directory Conventions

Create common directories:

mkdir -p src/app/api
mkdir -p src/components
mkdir -p src/lib
mkdir -p src/types

Got: All four directories created under src/.

If fail: If src/ does not exist, create it first or adjust paths to match the project structure (non-src layout uses app/ at the root).

Step 5: Create Base Layout

Edit src/app/layout.tsx:

import type { Metadata } from "next";
import { Inter } from "next/font/google";
import "./globals.css";

const inter = Inter({ subsets: ["latin"] });

export const metadata: Metadata = {
  title: "My Application",
  description: "Application description",
};

export default function RootLayout({
  children,
}: {
  children: React.ReactNode;
}) {
  return (
    <html lang="en">
      <body className={inter.className}>{children}</body>
    </html>
  );
}

Got: Layout renders with the Inter font and wraps all pages.

If fail: If font fails to load, check network access. Replace Inter with a system font fallback as a temporary workaround.

Step 6: Add Example API Route

Create src/app/api/health/route.ts:

import { NextResponse } from "next/server";

export async function GET() {
  return NextResponse.json({ status: "ok", timestamp: new Date().toISOString() });
}

Got: File created at src/app/api/health/route.ts.

If fail: Ensure the api/health/ directory exists. The file must export named HTTP method handlers (GET, POST, etc.), not a default export.

Step 7: Run Development Server

cd my-app
npm run dev

Got: Application running at http://localhost:3000.

If fail: Check Node.js version (>= 18.17). Run npm install if dependencies missing.

Validation

npm run dev starts without errors
Home page loads at localhost:3000
TypeScript compilation succeeds
Tailwind CSS classes applied
API route responds at /api/health
ESLint runs without errors (npm run lint)

Pitfalls

Node.js version: Next.js requires Node.js >= 18.17. Check with node --version.
Port conflicts: Default port 3000 may be in use. Use npm run dev -- -p 3001.
Import alias confusion: @/* maps to src/*. Don't confuse with node_modules imports.
Pages vs App Router: Ensure App Router (src/app/), not Pages Router (src/pages/).

Related Skills

setup-tailwind-typescript - detailed Tailwind and TypeScript configuration
deploy-to-vercel - deploy the scaffolded app
configure-git-repository - version control setup

GitHub リポジトリ

pjt222/agent-almanac

パス: i18n/caveman-lite/skills/scaffold-nextjs-app

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