next.config.ts

import type { NextConfig } from "next";

/**
 * Baseline security headers. The CSP ships as Report-Only until Phase 5,
 * when the contact form / API routes land and the policy is tightened and
 * switched to enforcing. `unsafe-inline`/`unsafe-eval` in script-src are
 * required by Next.js dev tooling and will be replaced with nonces/hashes
 * at enforcement time.
 */
const contentSecurityPolicy = [
  "default-src 'self'",
  "script-src 'self' 'unsafe-inline' 'unsafe-eval'",
  "style-src 'self' 'unsafe-inline'",
  "img-src 'self' blob: data:",
  "font-src 'self'",
  "connect-src 'self'",
  "object-src 'none'",
  "base-uri 'self'",
  "form-action 'self'",
  "frame-ancestors 'none'",
].join("; ");

const securityHeaders = [
  { key: "Content-Security-Policy-Report-Only", value: contentSecurityPolicy },
  { key: "X-Content-Type-Options", value: "nosniff" },
  { key: "X-Frame-Options", value: "DENY" },
  { key: "Referrer-Policy", value: "strict-origin-when-cross-origin" },
  {
    key: "Permissions-Policy",
    value: "camera=(), microphone=(), geolocation=()",
  },
];

const nextConfig: NextConfig = {
  reactStrictMode: true,
  poweredByHeader: false,
  // A stray lockfile in the home directory otherwise makes Next infer the
  // wrong workspace root for file tracing.
  outputFileTracingRoot: __dirname,
  images: {
    formats: ["image/avif", "image/webp"],
  },
  async headers() {
    return [
      {
        source: "/(.*)",
        headers: securityHeaders,
      },
    ];
  },
};

export default nextConfig;