import type { AuthagonalBffOptions } from './options.js';
interface ExpressReq {
    method?: string;
    url?: string;
    originalUrl?: string;
    headers: Record<string, string | string[] | undefined>;
    socket?: {
        encrypted?: boolean;
        remoteAddress?: string;
    };
    /** Express's own resolved client address. It honours the host app's `trust proxy` setting, which is
     * why the proxy asserts it rather than re-deriving a trust decision the host has already made. */
    ip?: string;
    body?: unknown;
    on(event: string, cb: (chunk?: unknown) => void): void;
}
interface ExpressRes {
    statusCode: number;
    setHeader(name: string, value: string | string[]): void;
    getHeader(name: string): string | number | string[] | undefined;
    end(body?: string | Uint8Array): void;
}
type NextFn = (err?: unknown) => void;
/**
 * Express middleware that serves the Authagonal BFF endpoints and calls `next()` for everything else:
 *
 * ```ts
 * app.use(authagonalBff({ authority, clientId, clientSecret, cookieSecret }));
 * ```
 */
export declare function authagonalBff(options: AuthagonalBffOptions): (req: ExpressReq, res: ExpressRes, next: NextFn) => void;
export {};