import { Parent } from './Parent.js';
import type { Widget, WidgetProperties } from '../widgets/Widget.js';
/**
 * A specialised version of the {@link Parent} class for parents with any amount
 * of children and public access to modifying this list of children.
 *
 * Can be constrained to a specific type of children.
 *
 * @category Widget
 */
export declare abstract class MultiParent<W extends Widget = Widget> extends Parent<W> {
    /**
     * This widget's children. Note that this is marked as readonly so that it
     * cannot be accidentally replaced with a new array. This way, references to
     * this array are always valid. If you want to clear this array, set the
     * length to zero instead of creating a new instance. readonly still means
     * that you can add/remove elements to/from the array.
     */
    protected readonly _children: Array<W>;
    constructor(children: Array<W>, properties?: Readonly<WidgetProperties>);
    [Symbol.iterator](): Iterator<W>;
    get childCount(): number;
    /**
     * Add child(ren) to this widget.
     *
     * {@link Widget#_layoutDirty} is set to true and each child's
     * {@link Widget#inheritedTheme} is set so that new children inherit this
     * widget's theme.
     *
     * Calls {@link Widget#markWholeAsDirty}.
     *
     * @param children - If this is a widget, then it is pushed to {@link MultiParent#_children}. If this is an array of widgets, then each widget is pushed to {@link MultiParent#_children}.
     * @returns Returns this so that the method is chainable.
     */
    add(children: W | Array<W>): this;
    /**
     * Remove child(ren) from this widget.
     *
     * Calls {@link Widget#markWholeAsDirty} and sets
     * {@link Widget#_layoutDirty} to true.
     *
     * @param children - If this is a widget, then it is removed from {@link MultiParent#_children}. If this is an array of widgets, then each widget is removed from {@link MultiParent#_children}.
     * @returns Returns this so that the method is chainable.
     */
    remove(children: W | Array<W>): this;
    /**
     * Remove all children from this widget.
     *
     * Calls {@link Widget#markWholeAsDirty} and sets
     * {@link Widget#_layoutDirty} to true.
     *
     * @returns Returns this so that the method is chainable.
     */
    clearChildren(): this;
}