/**
 * Helper methods for cron expression validation and next execution calculation.
 *
 * The default timezone is UTC to ensure deterministic behavior across
 * environments and to avoid implicit dependency on host-local timezone.
 */
export declare class CronExpressionUtils {
    static readonly DEFAULT_TIMEZONE = "UTC";
    /**
     * Validates a cron expression by trying to parse it and resolve the next execution date.
     *
     * This method supports both common cron variants:
     * - 5-field format: `minute hour day-of-month month day-of-week`
     * - 6-field format: `second minute hour day-of-month month day-of-week`
     *
     * The parser infers which format is provided by the number of fields.
     * If the expression is invalid, an error is thrown.
     *
     * @param expression cron expression to validate
     * @param timezone optional IANA timezone. Defaults to UTC for deterministic behavior.
     */
    static validate(expression: string, timezone?: string): void;
    /**
     * Computes the next execution date strictly after the provided base date.
     *
     * This method accepts both 5-field and 6-field cron expressions:
     * - 5-field expressions do not contain seconds and are interpreted with minute precision.
     * - 6-field expressions include seconds and are interpreted with second precision.
     *
     * The resulting date is calculated in the provided timezone.
     * If no timezone is passed, UTC is used to avoid environment-dependent behavior.
     *
     * @param expression cron expression in 5-field or 6-field format
     * @param baseDate baseline date from which the next tick should be found
     * @param timezone optional IANA timezone. Defaults to UTC.
     * @returns next execution timestamp
     */
    static nextExecutionDate(expression: string, baseDate: Date, timezone?: string): Date;
}