/**
 * Lesson Availability Utilities
 * Helper functions for checking recommended lesson availability based on dates
 */
import { type LessonAvailabilityResult } from '../types/lessonAvailability';
/**
 * Check lesson availability based on start and end dates
 * @param startDate - ISO string for lesson start date (when it becomes available)
 * @param finalDate - ISO string for lesson end date (when it expires)
 * @returns LessonAvailabilityResult with status and formatted dates
 *
 * @example
 * ```typescript
 * const result = checkLessonAvailability('2024-01-01', '2024-12-31');
 * // { status: 'DISPONIVEL', startDate: Date, endDate: Date, ... }
 * ```
 */
export declare const checkLessonAvailability: (startDate: string | null, finalDate: string | null) => LessonAvailabilityResult;
/**
 * Check if a lesson is not yet available (before start date)
 * @param startDate - ISO string for lesson start date
 * @returns true if the lesson has not started yet
 *
 * @example
 * ```typescript
 * if (isLessonNotYetAvailable('2025-01-01')) {
 *   showNotAvailableModal();
 * }
 * ```
 */
export declare const isLessonNotYetAvailable: (startDate: string | null) => boolean;
/**
 * Check if a lesson has expired (after end date)
 * @param finalDate - ISO string for lesson end date
 * @returns true if the lesson has expired
 *
 * @example
 * ```typescript
 * if (isLessonExpired('2023-12-31')) {
 *   showExpiredView();
 * }
 * ```
 */
export declare const isLessonExpired: (finalDate: string | null) => boolean;
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