import { ScheduleUnit } from './interfaces';
/**
 * Class to construct a cron expression with a fluent API.
 */
export declare class CronExpressionBuilder {
    private readonly schedule;
    /**
     * Initializes a new instance of the CronExpressionBuilder class.
     */
    constructor();
    /**
     * Ensures that all parts of the cron schedule have default values.
     * This method sets defaults for minute, hour, dayOfMonth, month, and dayOfWeek
     * if they are not already specified. Defaults to '0' for minute and
     * wildcards '*' for other fields to represent "every" value.
     */
    private ensureDefaultValues;
    /**
     * Sets the job to run at specific minutes.
     * @param {Array<number>} minutes - Minute(s) at which the job should run.
     * @returns {this} The instance of CronExpressionBuilder for chaining.
     */
    atMinutes(minutes: Array<number>): this;
    /**
     * Sets the job to run at a specific hour.
     * @param {Array<number>} hours - Hour at which the job should run.
     * @returns {this} The instance of CronExpressionBuilder for chaining.
     */
    atHours(hours: number[]): this;
    /**
     * Sets the job to run at a specific time.
     * @param {string} time - Time in HH:MM format.
     * @returns {this} The instance of CronExpressionBuilder for chaining.
     */
    atTime(time: string): this;
    /**
     * Sets the frequency of the job based on the specified unit.
     * @param {string} unit - The time unit (e.g., 'minute', 'hour').
     * @returns {this} The instance of CronExpressionBuilder for chaining.
     */
    every(unit: string): this;
    /**
     * Sets the job to run at a specified interval for the given unit.
     * @param {ScheduleUnit} unit - The unit of time ('minute', 'hour', 'day', etc.).
     * @param {number} interval - The interval at which the job should run.
     * @returns {this} The instance of CronExpressionBuilder for chaining.
     */
    everyX(interval: number, unit: ScheduleUnit): this;
    /**
     * Specifies the days of the week when a job should run.
     * @param {Array<number>} days - Day(s) of the week.
     */
    onWeekDays(days: Array<number>): this;
    /**
     * Specifies the days of the month when a job should run.
     * @param {Array<number>} days - Day(s) of the month.
     * @returns {this} The instance of CronExpressionBuilder for chaining.
     */
    onDaysOfMonth(days: Array<number>): this;
    /**
     * Specifies the months when a job should run.
     * @param {Array<number>} months - Month(s).
     * @returns {this} The instance of CronExpressionBuilder for chaining.
     */
    duringMonths(months: Array<number>): this;
    /**
     * Compiles the individual parts of the schedule into a cron expression.
     * @returns {string} The cron expression representing the schedule.
     */
    compile(): string;
}