import 'reflect-metadata';
export declare const GROUP_SYMBOL: unique symbol;
export interface Group {
    groupTag: string | undefined;
    constructor: Function;
    className: string;
}
/**
 * Decorator for the Cron Job class
 * @param groupTag 'tag of the group. It is used to uniquely identify this class so that all jobs in the class can be started or stoppoed using this key
 * @returns A class Decorator
 */
export declare function cronGroup(groupTag?: string): ClassDecorator;