next.config.ts

import type { NextConfig } from "next";

const nextConfig: NextConfig = {
  // Performance optimizations
  experimental: {
    optimizeCss: false,
    webpackBuildWorker: true,
  },
  
  // Image optimization for local images
  images: {
    formats: ['image/webp', 'image/avif'],
    minimumCacheTTL: 31536000, // 1 year
    deviceSizes: [640, 750, 828, 1080, 1200, 1920],
    imageSizes: [16, 32, 48, 64, 96, 128, 256, 384],
  },
  
  // Compression
  compress: true,
  
  // Bundle optimization
  webpack: (config, { dev, isServer }) => {
    if (!dev && !isServer) {
      // Tree shaking optimization
      config.optimization = {
        ...config.optimization,
        sideEffects: false,
        usedExports: true,
      };
    }
    return config;
  },
  
  // Static optimization
  trailingSlash: false,
  generateEtags: true,
  
  // Performance headers
  headers: async () => {
    return [
      {
        source: '/(.*)',
        headers: [
          {
            key: 'X-DNS-Prefetch-Control',
            value: 'on'
          },
          {
            key: 'X-XSS-Protection',
            value: '1; mode=block'
          },
          {
            key: 'X-Frame-Options',
            value: 'SAMEORIGIN'
          },
          {
            key: 'X-Content-Type-Options',
            value: 'nosniff'
          }
        ]
      },
      {
        source: '/api/(.*)',
        headers: [
          {
            key: 'Cache-Control',
            value: 'public, max-age=300, stale-while-revalidate=600'
          }
        ]
      }
    ];
  }
};

export default nextConfig;