import { Schedule } from './interfaces';
export declare class CronUtils {
    /**
     * Checks if the numbers in an array are contiguous.
     * @param {Array<number>} numbers - An array of numbers to check.
     * @returns {boolean} - True if the numbers form a contiguous sequence.
     */
    static isContiguous(numbers: Array<number>): boolean;
    /**
     * Formats a list of numbers into a cron-compatible string.
     * @param {Array<number>} values - An array of numbers.
     * @returns {string} - A cron-formatted string.
     */
    static formatCronPart(values: Array<number>): string;
    /**
     * Sets a default value for a given key in a schedule object if it's not already set.
     * @param {Schedule} schedule - The schedule object.
     * @param {string} field - The key to check in the schedule.
     * @param {string | number} defaultValue - The default value to set if the key is undefined.
     */
    static setDefault(schedule: Schedule, field: string, defaultValue: string | number): void;
}