/**
 * Cron expression parser for standard 5-field cron syntax.
 *
 * Format: minute hour day-of-month month day-of-week
 *
 * Supported syntax:
 * - `*` - any value
 * - `N` - specific value
 * - `N-M` - range from N to M (inclusive)
 * - `N,M,O` - list of values
 * - `*\/N` or `N/M` - step values (every N starting at 0, or every M starting at N)
 */
export interface CronSchedule {
    minute: number[];
    hour: number[];
    dayOfMonth: number[];
    month: number[];
    dayOfWeek: number[];
}
/**
 * Parse a cron expression into a schedule object.
 *
 * @param expression - Standard 5-field cron expression (minute hour day month weekday)
 * @returns Parsed schedule with arrays of valid values for each field
 * @throws Error if the expression is invalid
 */
export declare function parseCron(expression: string): CronSchedule;
/**
 * Check if a schedule should run at the given date/time.
 *
 * @param schedule - Parsed cron schedule
 * @param at - Date to check (defaults to now)
 * @returns True if the schedule matches the given time
 */
export declare function shouldRunAt(schedule: CronSchedule, at?: Date): boolean;
/**
 * Calculate the next run time after a given date.
 *
 * @param schedule - Parsed cron schedule
 * @param after - Start searching from this date (defaults to now)
 * @returns The next date/time when the schedule will run
 */
export declare function nextRun(schedule: CronSchedule, after?: Date): Date;
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