/**
 * Simple object check.
 *
 * @param item
 * @returns Wether or not the `item` is an object
 */
export declare function isObject(item: any): boolean;
/**
 * Deep merge two objects. Circular reference will cause infinite recursion.
 *
 * @param target The object to merge `...sources` into
 * @param ...sources The sources to merge into `target`
 */
export declare function mergeDeep(target: any, ...sources: any[]): any;