next.config.ts

import type { NextConfig } from "next";

const nextConfig: NextConfig = {
  // Production optimizations
  reactStrictMode: true,
  poweredByHeader: false,
  compress: true,
  
  // Image optimization
  images: {
    domains: ['e2b.app'],
    formats: ['image/avif', 'image/webp'],
    minimumCacheTTL: 60,
  },
  
  // Security headers
  async headers() {
    return [
      {
        source: '/:path*',
        headers: [
          {
            key: 'X-DNS-Prefetch-Control',
            value: 'on'
          },
          {
            key: 'Strict-Transport-Security',
            value: 'max-age=63072000; includeSubDomains; preload'
          },
          {
            key: 'X-Frame-Options',
            value: 'SAMEORIGIN'
          },
          {
            key: 'X-Content-Type-Options',
            value: 'nosniff'
          },
          {
            key: 'X-XSS-Protection',
            value: '1; mode=block'
          },
          {
            key: 'Referrer-Policy',
            value: 'strict-origin-when-cross-origin'
          },
          {
            key: 'Permissions-Policy',
            value: 'camera=(), microphone=(), geolocation=(), interest-cohort=()'
          }
        ],
      },
    ];
  },
  
  // Environment variable validation
  env: {
    NEXT_PUBLIC_APP_URL: process.env.NEXT_PUBLIC_APP_URL || '',
  },
  
  // Webpack configuration for production
  webpack: (config, { isServer }) => {
    if (!isServer) {
      // Don't bundle server-only modules on client
      config.resolve.fallback = {
        ...config.resolve.fallback,
        fs: false,
        net: false,
        tls: false,
      };
    }
    return config;
  },
  
  // Output standalone for optimal Docker/Vercel deployment
  // Disabled for Windows dev builds due to symlink permission issues
  // output: 'standalone',
};

export default nextConfig;