next.config.js

const { withContentlayer } = require("next-contentlayer");
const { withPlaiceholder } = require("@plaiceholder/next");

/** @type {import('next').NextConfig} */

module.exports = withContentlayer(
  withPlaiceholder({
    swcMinify: true,
    reactStrictMode: true,
    images: {
      domains: ["images.unsplash.com", "res.cloudinary.com"],
    },
    experimental: {
      legacyBrowsers: false,
      browsersListForSwc: true,
    },
    async headers() {
      return [
        {
          source: "/(.*)",
          headers: securityHeaders,
        },
      ];
    },
  })
);

// https://nextjs.org/docs/advanced-features/security-headers
const ContentSecurityPolicy = `
    default-src 'self';
    script-src 'self' 'unsafe-eval' 'unsafe-inline' *.youtube.com *.twitter.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
  {
    key: "Permissions-Policy",
    value: "camera=(), microphone=(), geolocation=()",
  },
];