import { Challenge, ChallengeAdapter } from '../types';
/**
 * In-memory challenge storage adapter
 *
 * Useful for development and testing. Does not persist data across restarts.
 * For production, use SQLite, PostgreSQL, or Redis adapters.
 */
export declare class MemoryAdapter implements ChallengeAdapter {
    private challenges;
    createChallenge(challenge: Challenge): Promise<void>;
    getChallenge(id: string): Promise<Challenge | null>;
    markChallengeUsed(id: string): Promise<void>;
    cleanupExpired(): Promise<void>;
}
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