next.config.js

/* eslint-disable @typescript-eslint/no-var-requires */
// @ts-check
/**
 * @type {import('next/dist/next-server/server/config').NextConfig}
 **/

// @ts-ignore
const withTM = require("next-transpile-modules")(["next-usequerystate"]);

// @ts-ignore
module.exports = withTM({
  webpack5: true,
  future: {
    strictPostcssConfiguration: true,
  },
  reactStrictMode: true,
  experimental: {
    turboMode: true,
    eslint: true,
  },
  images: {
    domains: [
      "api.microlink.io",
      "i.scdn.co", // Spotify Album Art
      "pbs.twimg.com", // Twitter Profile Picture
    ],
  },
  async headers() {
    return [
      {
        source: "/(.*)",
        headers: securityHeaders,
      },
    ];
  },
  webpack: (config, { dev: _dev, isServer: _isServer }) => {
    // if (isServer) {
    //   require('./scripts/generate-sitemap');
    //   require('./scripts/generate-rss');
    // }

    config.module.rules.push({
      test: /\.(ogg|mp3|wav|mpe?g)$/i,
      exclude: config.exclude,
      use: [
        {
          loader: "file-loader",
          options: {
            publicPath: "/_next/static/sounds/",
            outputPath: "static/sounds/",
            name: "[name].[ext]",
            esModule: false,
          },
        },
      ],
    });

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

    return config;
  },
});

// https://securityheaders.com
const ContentSecurityPolicy = `
  default-src 'self';
  script-src 'self' 'unsafe-eval' 'unsafe-inline' *.youtube.com *.twitter.com cdn.usefathom.com;
  child-src *.youtube.com *.google.com *.twitter.com;
  style-src 'self' 'unsafe-inline' *.googleapis.com;
  img-src * blob: data:;
  media-src 'none';
  connect-src *;
  font-src 'self';
`;

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: "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; preload",
  },
  // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Feature-Policy
  // Opt-out of Google FLoC: https://amifloced.org/
  {
    key: "Permissions-Policy",
    value: "camera=(), microphone=(), geolocation=(), interest-cohort=()",
  },
];