next.config.mjs

import { createMDX } from 'fumadocs-mdx/next';
import bundleAnalyzer from '@next/bundle-analyzer';

const withMDX = createMDX();
const withBundleAnalyzer = bundleAnalyzer({
  enabled: process.env.ANALYZE === 'true',
});

/** @type {import('next').NextConfig} */
const config = {
  reactStrictMode: true,
  
  // Explicitly set the build output directory to ensure .next is created here
  distDir: '.next',

  // Security and SEO headers
  async headers() {
    return [
      {
        source: '/:path*',
        headers: [
          // Security Headers for SEO Trust Signals
          {
            key: 'X-DNS-Prefetch-Control',
            value: 'on'
          },
          {
            key: 'Strict-Transport-Security',
            value: 'max-age=63072000; includeSubDomains; preload'
          },
          {
            key: 'X-Content-Type-Options',
            value: 'nosniff'
          },
          {
            key: 'X-Frame-Options',
            value: 'SAMEORIGIN'
          },
          {
            key: 'X-XSS-Protection',
            value: '1; mode=block'
          },
          {
            key: 'Referrer-Policy',
            value: 'origin-when-cross-origin'
          },
          {
            key: 'Permissions-Policy',
            value: 'camera=(), microphone=(), geolocation=()'
          },
          // SEO and Performance Headers
          {
            key: 'X-Robots-Tag',
            value: 'index, follow, max-image-preview:large, max-snippet:-1, max-video-preview:-1'
          },
        ],
      },
      // Allow AI crawlers and search engines to access all content
      {
        source: '/api/:path*',
        headers: [
          {
            key: 'X-Robots-Tag',
            value: 'noindex, nofollow'
          },
        ],
      },
      // Cache static assets for 1 year (immutable)
      {
        source: '/:path*.(ico|png|jpg|jpeg|gif|svg|webp|avif|woff|woff2|mp4|webm)',
        headers: [
          {
            key: 'Cache-Control',
            value: 'public, max-age=31536000, immutable'
          },
        ],
      },
    ];
  },

  // Optimize images for better SEO
  images: {
    formats: ['image/avif', 'image/webp'],
    deviceSizes: [640, 750, 828, 1080, 1200, 1920, 2048, 3840],
    imageSizes: [16, 32, 48, 64, 96, 128, 256, 384],
  },

  // Enable compression for better performance (SEO factor)
  compress: true,

  // Power by header (optional - you can disable for security)
  poweredByHeader: false,

  // Trailing slash preference for consistency
  trailingSlash: false,

  // Redirect root favicon requests to the correct location
  async redirects() {
    return [
      {
        source: '/favicon.ico',
        destination: '/favicon/favicon.ico',
        permanent: true,
      },
    ];
  },
};

export default withBundleAnalyzer(withMDX(config));