import dayjs from 'dayjs';
import { isEmpty } from 'lodash';
import { SaveActivityLogDTO } from '../types';
export declare const ACTIVITY_LOG_QUEUE = "activity.log";
export { isEmpty, dayjs, };
export declare class HelperUtil {
    static sleep(durationInMs?: number): Promise<unknown>;
    static saveActivityLog(activityLog: SaveActivityLogDTO, options?: any): Promise<void>;
    static removeFieldsWithEmptyValue(value: any): any;
    static getUniqueStringItemsFromArray(items: Array<string | undefined | null>): string[];
    static getUniqueObjectItemsFromArray<T extends Record<string, any>>(items: T[], keys: Array<keyof T>): T[];
}