/**
 * Lightweight, dependency-free parser for standard 5-field cron expressions:
 *
 *   minute  hour  day-of-month  month  day-of-week
 *
 * Each field supports:
 *   - `*` — every value in the field range
 *   - A single integer (e.g. `9`)
 *   - A comma-separated list (e.g. `1,3,5`)
 *   - A range (e.g. `1-5`)
 *   - A step (e.g. `* /15`, `0-30/5`)
 *
 * For day-of-week, both `0` and `7` represent Sunday.
 *
 * This module exists to keep AdapTable free of the `cron-parser` package (which
 * transitively pulls in `luxon`). AdapTable only uses cron expressions in the
 * Scheduling system, and only ever needs to:
 *   1. validate a user-entered cron string, and
 *   2. compute the next fire time from "now".
 */
interface ParsedCron {
    minute: Set<number>;
    hour: Set<number>;
    dayOfMonth: Set<number>;
    month: Set<number>;
    dayOfWeek: Set<number>;
    /** True when the day-of-month field is `*` (i.e. unrestricted). */
    dayOfMonthIsStar: boolean;
    /** True when the day-of-week field is `*` (i.e. unrestricted). */
    dayOfWeekIsStar: boolean;
}
/**
 * Parses a 5-field cron expression. Throws when the expression is invalid.
 */
export declare function parseCronExpression(expression: string): ParsedCron;
/**
 * Returns true if the given expression is a valid 5-field cron expression.
 */
export declare function isCronExpressionValid(expression: string): boolean;
/**
 * Returns the next time the cron expression fires after `fromDate` (exclusive).
 * Returns null if no match is found within a 4-year horizon.
 */
export declare function getNextCronOccurrence(expression: string, fromDate?: Date): Date | null;
export {};