/**
 * Patch Container class to add implementation of contains method.
 */
import { Container, DisplayObject } from "pixi.js";
/**
 * Determines whether the specified child object is a child of the Container instance or the instance itself.
 * The search includes the entire display list including this Container instance.
 * Grandchildren, great-grandchildren, and so on each return true.
 *
 * @param child The child object to test.
 *
 * @return true if the child object is a child of the Container or the Container itself; otherwise false.
 *
 * @see {@link https://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/display/DisplayObjectContainer.html#contains()}
 */
export declare function contains(container: Container, child: DisplayObject): boolean;