next.config.js

const isProd = process.env.NODE_ENV === "production";

const withBundleAnalyzer = require("@next/bundle-analyzer")({
  enabled: process.env.ANALYZE === "true",
});

// you might need to insert additional domains in script-src if you are using external services
const ContentSecurityPolicy = `
  default-src 'self';
  script-src 'self' 'unsafe-eval' 'unsafe-inline' giscus.app;
  style-src 'self' 'unsafe-inline';
  img-src * blob: data:;
  media-src 'none';
  connect-src *;
  font-src 'self';
  frame-src giscus.app
`;

const securityHeaders = [
  // https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP
  {
    key: "Content-Security-Policy",
    value: ContentSecurityPolicy.replace(/\n/g, ""),
  },
  // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Referrer-Policy
  {
    key: "Referrer-Policy",
    value: "strict-origin-when-cross-origin",
  },
  // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options
  {
    key: "X-Frame-Options",
    value: "DENY",
  },
  // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Content-Type-Options
  {
    key: "X-Content-Type-Options",
    value: "nosniff",
  },
  // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-DNS-Prefetch-Control
  {
    key: "X-DNS-Prefetch-Control",
    value: "on",
  },
  // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security
  {
    key: "Strict-Transport-Security",
    value: "max-age=31536000; includeSubDomains",
  },
  // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Feature-Policy
  {
    key: "Permissions-Policy",
    value: "camera=(), microphone=(), geolocation=()",
  },
  // not so sure what this does
  {
    key: "Cache-Control",
    value: "public, max-age=31536000, immutable",
  },
];

/**
 * @type {import('next/dist/next-server/server/config').NextConfig}
 * @type {import('next').NextConfig}
 **/
module.exports = withBundleAnalyzer({
  reactStrictMode: true,
  pageExtensions: ["ts", "tsx", "js", "jsx", "md", "mdx"],
  eslint: {
    dirs: ["pages", "components", "lib", "layouts", "scripts"],
  },
  images : {
    domains: ['images.unsplash.com']
  },
  async redirects() {
    return [
      {
        source: "/sh",
        destination: "https://www.youtube.com/watch?v=dQw4w9WgXcQ",
        permanent: true,
      },
    ];
  },
  async headers() {
    return [
      {
        source: "/(.*)",
        headers: securityHeaders,
      },
    ];
  },
  webpack: (config, { dev, isServer }) => {
    config.module.rules.push({
      test: /\.(png|jpe?g|gif|mp4)$/i,
      use: [
        {
          loader: "file-loader",
          options: {
            publicPath: "/_next",
            name: "static/media/[name].[hash].[ext]",
          },
        },
      ],
    });

    config.module.rules.push({
      test: /\.svg$/,
      use: ["@svgr/webpack"],
    });

    if (!dev && !isServer) {
      // replace React with Preact only in client production build
      Object.assign(config.resolve.alias, {
        "react/jsx-runtime.js": "preact/compat/jsx-runtime",
        react: "preact/compat",
        "react-dom/test-utils": "preact/test-utils",
        "react-dom": "preact/compat",
      });
    }

    return config;
  },
});