/**
 * Utilities for caching fingerprint data to maintain consistency
 */
/**
 * Save data to localStorage with the given key and expiration
 * Note: validityPeriod parameter isn't needed here since it's only used when retrieving
 */
export declare function saveToCache<T>(key: string, data: T): void;
/**
 * Retrieve data from localStorage if it exists and is still valid
 * @returns The cached data if valid, null otherwise
 */
export declare function getFromCache<T>(key: string, validityPeriod?: number): T | null;
/**
 * Generate a consistent key for storing fingerprint data
 * This ensures fingerprints for the same origin remain stable
 */
export declare function generateCacheKey(prefix: string): string;