/**
 * User identity management with persistent anonymous IDs
 */
/**
 * Generate a unique anonymous user ID
 */
export declare function generateAnonymousId(): string;
/**
 * Get or create anonymous user ID
 * This persists across sessions and is the primary way to track users before they identify
 */
export declare function getAnonymousId(): string;
/**
 * Get user visit statistics
 */
export declare function getUserVisitStats(): {
    firstSeen: string | null;
    lastSeen: string | null;
    visitCount: number;
};
/**
 * Clear anonymous identity (useful for logout)
 */
export declare function clearAnonymousIdentity(): void;
/**
 * Link anonymous ID to authenticated user
 * Returns the anonymous ID that should be sent to backend for user merging
 */
export declare function linkIdentity(userId: string): string | null;
/**
 * Get comprehensive identity information
 */
export declare function getIdentityInfo(): {
    isReturningUser: boolean;
    daysSinceFirstVisit: number;
    firstSeen: string | null;
    lastSeen: string | null;
    visitCount: number;
    anonymousId: string;
};
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