import { Indexable } from '../interfaces/indexable';
/**
 * Helper to get and set Attributes on Objects
 */
export declare class ObjectHelper {
    /**
     * Checking if the Element is an Object
     * @param {any} obj
     * @return {boolean}
     */
    static isObject(obj: any): boolean;
    /**
     * Formatting date as German
     * @param {string} date yyyy-mm-dd
     * @return {string} dd.mm.yyyy
     */
    static formatDate(date: string | undefined): string;
    /**
     * Adding Days to Date
     * @param {Date} date
     * @param {number} days
     * @return {Date}
     */
    static addDaysToDate(date: Date, days: number): Date;
    /**
     * Converts a date to a string
     * @param {Date} date
     * @return {string}
     */
    static dateToString(date: Date): string;
    /**
       * Getting Value from JSON-Object
       * @param {Indexable} object
       * @param {string} key
       * @return {any}
       */
    static get(object: Indexable, key: string): any;
    /**
       * Iterating Through Object
       * @param {Indexable} obj
       * @param {string[]} attributes
       * @param {number} depth
       * @return {any}
       * @private
       */
    static _iterateThrough(obj: Indexable, attributes: string[], depth?: number): any;
    /**
       * Setting value for Object
       * @param {Indexable} object
       * @param {string} key
       * @param {any} value
       */
    static set(object: Indexable, key: string, value: any): void;
    /**
     * Converts a string to bool
     * @param {string} v
     * @return {boolean}
     */
    static stringToBool(v: string): boolean;
    /**
       * Object to String
       * @param {Object} obj
       * @return {string}
       */
    static objectToStringDeep(obj: any): string;
}
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