import { Component, ContextManager, Observable } from '@zcomponent/core';
/**
 * The Face tracker node detects and tracks the user's face.
 * You can attach 3D objects to the face itself, or render a 3D mesh that's fit to (and deforms with) the face as the user moves and changes their expression.
 * You could build face-filter experiences to allow users to try on different virtual sunglasses, for example, or to simulate face paint.
 * @zcomponent
 * @zgroup AR
 * @zicon person_search
 * @ztag three/Zappar/FaceTracker
 * @zparents three/Object3D/Group/Group
 * @zdefaultchild "Anchor Group (origin)" "@zcomponent/zappar-three/lib/components/anchorgroups/FaceAnchorGroup#FaceAnchorGroup"
 */
export declare class FaceTracker extends Component {
    /**
     * By default a maximum of one face is tracked at a time, however you can change this using the maxFaces parameer.
     *
     * Note that setting a value of two or more may impact the performance and framerate of the library, so we recommend sticking with one unless your use case requires tracking multiple faces.
     *
     * @zprop
     * @zgroup Tracker
     * @zgrouppriority 21
     * @zdefault 1
     */
    maxFaces: Observable<number, never>;
    private _faceTrackerContext;
    constructor(ctx: ContextManager, props: {});
    private _updateEnabled;
    dispose(): never;
}