next.config.ts

import type { NextConfig } from 'next';

const nextConfig: NextConfig = {
  // Enable standalone output for Docker deployments
  // Set DOCKER_BUILD=true in CI/CD or when building Docker images
  ...(process.env.DOCKER_BUILD === 'true' && { output: 'standalone' as const }),

  // Required for PostHog reverse proxy rewrites
  skipTrailingSlashRedirect: true,

  // PostHog reverse proxy — avoids ad blockers
  async rewrites() {
    return [
      {
        source: '/ingest/static/:path*',
        destination: 'https://us-assets.i.posthog.com/static/:path*',
      },
      {
        source: '/ingest/:path*',
        destination: 'https://us.i.posthog.com/:path*',
      },
    ];
  },

  // Security headers
  async headers() {
    return [
      {
        source: '/(.*)',
        headers: [
          { key: 'X-Frame-Options', value: 'DENY' },
          { key: 'X-Content-Type-Options', value: 'nosniff' },
          { key: 'Referrer-Policy', value: 'origin-when-cross-origin' },
          { key: 'X-DNS-Prefetch-Control', value: 'on' },
        ],
      },
    ];
  },
};

export default nextConfig;