/**
* Utilities for working with objects.
*
* @public
* @module lang/object
*/
/**
 * Performs "deep" equality check on two objects.
 *
 * Array items are compared, object properties are compared, and
 * "primitive" values are checked using strict equality rules.
 *
 * @static
 * @param {object} a
 * @param {object} b
 * @returns {boolean}
 */
export function equals(a: object, b: object): boolean;
/**
 * Performs a "deep" copy.
 *
 * @static
 * @param {object} source - The object to copy.
 * @param {Function=} canExtract - An optional function which indicates if the "extractor" can be used.
 * @param {Function=} extractor - An optional function which returns a cloned value for a property for assignment to the cloned
 * @returns {object}
 */
export function clone(source: object, canExtract?: Function | undefined, extractor?: Function | undefined): object;
/**
 * Creates a new object (or array) by performing a deep copy
 * of the properties from each  If the same property
 * exists on both objects, the property value from the
 * second object ("b") is preferred.
 *
 * @static
 * @param {object} a
 * @param {object} b
 * @returns {object}
 */
export function merge(a: object, b: object): object;
/**
 * Given an object, returns an array of "own" properties.
 *
 * @static
 * @param {object} target - The object to interrogate.
 * @returns {Array<string>}
 */
export function keys(target: object): Array<string>;
/**
 * Given an object, returns a boolean value, indicating if the
 * object has any "own" properties.
 *
 * @static
 * @param {object} target - The object to interrogate.
 * @returns {boolean}
 */
export function empty(target: object): boolean;