import { Context, ContextManager, Event, Observable } from '@zcomponent/core';
import * as Zappar from '@zappar/zappar';
export declare class FaceTrackerContext extends Context {
    faceTracker?: Zappar.FaceTracker;
    maxFaces: Observable<number, never>;
    onNewAnchor: Event<[Zappar.FaceAnchor]>;
    onVisible: Event<[Zappar.FaceAnchor]>;
    onNotVisible: Event<[Zappar.FaceAnchor]>;
    anchors: Map<string, Zappar.FaceAnchor>;
    visible: Set<Zappar.FaceAnchor>;
    constructor(contextManager: ContextManager, props: {});
    dispose(): never;
}