export declare class CronHelper {
    protected static cronStringToCronObject(str: string | null): {
        ranges: Array<Array<number>> | null;
        value: number | null;
        values: Array<any> | null;
    } | null;
    static matchCurrentTimestamp(cron: string | null, timestamp: number | null): boolean;
    protected static validCronObject(obj: {
        ranges: Array<Array<number>> | null;
        value: number | null;
        values: Array<any> | null;
    } | null, value: number | null): boolean;
}