Next.js 15へ安全にアップグレードする方法

npm list next

npm install next@latest react@latest react-dom@latest

yarn add next@latest react@latest react-dom@latest

<Image src="/logo.png" alt="logo" width={100} height={100} priority />

<Image src="/logo.png" alt="logo" width={100} height={100} loading="eager" />

const inter = Inter({ subsets: ['latin'], fallback: ['Arial'] });

const nextConfig = {
  experimental: {
    turbo: true,
  },
};
module.exports = nextConfig;

import { headers } from 'next/headers';
export default async function Page() {
  const headerList = headers();
  const token = headerList.get('Authorization');
  return <div>Header 확인</div>;
}

export default async function Page({ request }) {
  const token = await request.headers.get('Authorization');
  return <div>Header 확인</div>;
}

npx @next/codemod <transform> <path>

npx @next/codemod remove-priority-image ./src