next.config.js

module.exports = {
  experimental: {
    esmExternals: true,
  },
  future: {
    strictPostcssConfiguration: true,
  },
  i18n: {
    defaultLocale: 'en',
    locales: ['en', 'es'],
  },
  webpack: (config, { dev, isServer }) => {
    // 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;
  },
  async headers() {
    return [
      {
        source: '/(.*)',
        headers: securityHeaders
      }
    ];
  },
  async redirects() {
    return [
      {
        source: '/calculadora-deducciones',
        destination: '/es/projects/tax-calculator-crc',
        permanent: true,
      },
      {
        source: '/calculadora',
        destination: '/es/projects/tax-calculator-crc',
        permanent: true,
      },
    ];
  }
};

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

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=()'
  }
];