interface FingerprintCacheData {
    visitorId?: string;
    requestId?: string;
    timestamp: number;
}
export declare function getCachedFingerprint(id?: string): FingerprintCacheData | null;
export declare function setCachedFingerprint(data: FingerprintCacheData, id?: string): void;
export declare function isCacheValid(cachedTimestamp: number, ttlSeconds: number): boolean;
export {};