今回使用したソースコード Next.jsのセットアップ Next.js本体の準備 公式に則り npx create-next-app@latestで開始します。 $ npx create-next-app@latest ✔ What is your project named? … worksample-nextjs14 ✔ Would you like to use TypeScript? … No / Yes ✔ Would you like to use ESLint? … No / Yes ✔ Would you like to use Tailwind CSS? … No / Yes ✔ Would you like to use `src/` directory? … No / Yes ✔ Would you like to use App Router? (recommend