next.config.mjs

import { createSecureHeaders } from 'next-secure-headers';

const options = {
  weekday: 'long',
  year: 'numeric',
  month: 'long',
  day: 'numeric',
  hour: 'numeric',
  minute: 'numeric',
  timeZoneName: 'long',
};
const lastBuild = new Date(new Date().toUTCString()).toLocaleString(
  'en-US',
  options,
);
const lastBuildIso = new Date().toISOString();

/** @type {import("next").NextConfig} **/
const nextConfig = {
  eslint: {
    dirs: ['src'],
  },
  optimizeFonts: true,
  compiler: {
    styledComponents: { ssr: true, displayName: true },
  },
  // chakra ui
  transpilePackages: ['@chakra-ui/react', '@chakra-ui/icons', 'react-icons'],
  images: {
    domains: ['avatars.githubusercontent.com'],
  },
  async headers() {
    return [
      {
        source: '/(.*)',
        headers: [
          ...createSecureHeaders(),
          // https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Strict-Transport-Security
          {
            key: 'X-DNS-Prefetch-Control',
            value: 'on',
          },
          {
            key: 'Strict-Transport-Security',
            value: 'max-age=31536000; includeSubDomains; preload',
          },
          {
            key: 'X-XSS-Protection',
            value: '1; mode=block',
          },
          {
            key: 'X-Frame-Options',
            value: 'SAMEORIGIN',
          },
          {
            key: 'X-Content-Type-Options',
            value: 'nosniff',
          },
          {
            key: 'Referrer-Policy',
            value: 'origin-when-cross-origin',
          },
        ],
      },
    ];
  },
  output: process.env.BUILD_STANDALONE === 'true' ? 'standalone' : undefined,
  poweredByHeader: false,
  publicRuntimeConfig: { lastBuild, lastBuildIso },
  reactStrictMode: true,

  // https://github.com/vercel/next.js/issues/48177#issuecomment-1557354538
  // SVGR
  webpack(config, { isServer }) {
    // Configures webpack to handle SVG files with SVGR. SVGR optimizes and transforms SVG files
    // into React components. See https://react-svgr.com/docs/next/

    // Grab the existing rule that handles SVG imports
    // @ts-ignore - rules is a private property that is not typed
    const fileLoaderRule = config.module.rules.find((rule) =>
      rule.test?.test?.('.svg'),
    );

    config.module.rules.push(
      // Reapply the existing rule, but only for svg imports ending in ?url
      {
        ...fileLoaderRule,
        test: /\.svg$/i,
        resourceQuery: /url/, // *.svg?url
      },
      // Convert all other *.svg imports to React components
      {
        test: /\.svg$/i,
        issuer: fileLoaderRule.issuer,
        resourceQuery: { not: [...fileLoaderRule.resourceQuery.not, /url/] }, // exclude if *.svg?url
        use: ['@svgr/webpack'],
      },
    );

    // Modify the file loader rule to ignore *.svg, since we have it handled now.
    fileLoaderRule.exclude = /\.svg$/i;

    return config;
  },
};

export default nextConfig;