import type { ValidityMode } from '../types/index';
/**
 * Compute the expiration date for a ticket based on validity mode.
 *
 * - day_reentry  → end of current day (23:59:59.999)
 * - time_slot    → now + duration minutes
 * - single_use   → null (expires on use)
 * - unlimited    → null (no expiration)
 */
export declare function computeValidUntil(mode: ValidityMode, durationMinutes: number | null): Date | null;
/**
 * Check if a ticket is expired based on its validUntil date.
 */
export declare function isExpired(validUntil: string | Date | null): boolean;
/**
 * Check if a timestamp falls within today (since midnight).
 */
export declare function isToday(date: string | Date): boolean;
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