next.config.mjs

const mode = process.env.BUILD_MODE ?? "standalone";
console.log("[Next] build mode", mode);

/** @type {import('next').NextConfig} */
const nextConfig = {
  webpack(config) {
    config.module.rules.push({
      test: /\.svg$/,
      use: ["@svgr/webpack"],
    });

    return config;
  },
  output: mode,
};

if (mode !== "export") {
  nextConfig.rewrites = async () => {
    const ret = [
      {
        source: "/api/proxy/:path*",
        destination: "https://api.openai.com/:path*",
      },
      {
        source: "/google-fonts/:path*",
        destination: "https://fonts.googleapis.com/:path*",
      },
      {
        source: "/sharegpt",
        destination: "https://sharegpt.com/api/conversations",
      },
    ];

    const apiUrl = process.env.API_URL;
    if (apiUrl) {
      console.log("[Next] using api url ", apiUrl);
      ret.push({
        source: "/api/:path*",
        destination: `${apiUrl}/:path*`,
      });
    }

    return {
      beforeFiles: ret,
    };
  };
}

export default nextConfig;