/**
 * Simple object check.
 * @param item
 * @returns {boolean}
 */
export declare function isObjectHelper(item: any): boolean;
/**
 * Deep merge two objects.
 * @param target
 * @param ...sources
 */
export declare function mergeDeep(target: any, ...sources: any[]): any;
export declare function mergeClone(target: any, ...sources: any[]): any;
export declare function clone(target: any): any;
