next.config.ts

/**
 * Copyright 2026 Circle Internet Group, Inc.  All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

import type { NextConfig } from "next";

// Applied to every route. No Content-Security-Policy here: Next.js needs per-request nonces for
// its inline scripts, and the Circle PIN widget loads its own frames, so a static one would
// either break the app or be too loose to help.
export const securityHeaders = [
  { key: "X-Content-Type-Options", value: "nosniff" },
  { key: "X-Frame-Options", value: "DENY" },
  { key: "Referrer-Policy", value: "strict-origin-when-cross-origin" },
];

const nextConfig: NextConfig = {
  // Next 16 blocks dev resources (HMR, client chunks) requested from an origin other than
  // localhost. The Playwright suite uses http://127.0.0.1, and without this the page never
  // hydrates. Dev only: it has no effect on `next start`.
  allowedDevOrigins: ["127.0.0.1"],
  async headers() {
    return [{ source: "/:path*", headers: securityHeaders }];
  },
};

export default nextConfig;