/// <reference types="webxr" />
import { ContextManager, Event, Observable } from '@zcomponent/core';
import { Group } from '../Group';
/**
 * The position of content placed in this group can be chosen by the user at the start of a WebXR session. It's particularly useful for "immersive-ar" mode.
 *
 * Root element: [THREE.Group](https://threejs.org/docs/index.html#api/en/objects/Group)
 *
 * @zcomponent
 * @zicon open_with
 * @zgroup Deprecated
 * @ztag three/Object3D/Group/WebXRPlacementGroup
 * @zparents three/Object3D/Group/**
 */
export declare class WebXRPlacementGroup extends Group {
    /**
     * @zui
     */
    onVisible: Event<[]>;
    /** @zui */
    onPlaced: Event<[]>;
    /**
     * @zui
     * @zgroup WebXRPlacementGroup
     * @zgrouppriority 20
     * @zdefault true
     */
    useControllerIfPresent: Observable<boolean, never>;
    /**
     * @zui
     * @zgroup WebXRPlacementGroup
     * @zgrouppriority 20
     * @zdefault "right"
     */
    controllerPreference: Observable<XRHandedness, never>;
    /**
     * @zui
     * @zgroup WebXRPlacementGroup
     * @zgrouppriority 20
     * @zdefault false
     */
    forceGroundPlane: Observable<boolean, never>;
    /**
     * @zui
     * @zgroup Animation
     * @zgrouppriority 10
     * @zdefault false
     * @zvalues layerclipids
     */
    placingLayerClip: Observable<string | undefined, never>;
    /**
     * @zui
     * @zgroup Animation
     * @zgrouppriority 10
     * @zdefault false
     * @zvalues layerclipids
     */
    notPlacingLayerClip: Observable<string | undefined, never>;
    private _innerGroup;
    private _hitSource;
    private _sourceSpace;
    private _useGroundPlaneIntersection;
    private _isPlacing;
    constructor(contextManager: ContextManager, constructorProps: {});
    private _updateHitSource;
    private _select;
    private _groundPlaneIntersection;
    private _frame;
}