import { Challenge, ChallengeAdapter } from '../types';
/**
 * Redis challenge storage adapter
 *
 * Provides fast, distributed storage using Redis. Excellent for high-traffic production deployments.
 * Challenges automatically expire using Redis TTL.
 */
export declare class RedisAdapter implements ChallengeAdapter {
    private client;
    private connected;
    constructor(redisUrl?: string);
    private connect;
    createChallenge(challenge: Challenge): Promise<void>;
    getChallenge(id: string): Promise<Challenge | null>;
    markChallengeUsed(id: string): Promise<void>;
    cleanupExpired(): Promise<void>;
    close(): Promise<void>;
}
//# sourceMappingURL=redis.d.ts.map