import { ContextManager, Observable } from '@zcomponent/core';
import { type Object3D } from 'three';
/**
 * Manages the display settings for various Three.js helper objects within a design-time environment.
 * Provides observables to control the visibility of camera and raycaster helpers.
 *
 */
export declare class ThreeHelperContext {
    /**
     * Observable property to control the visibility of camera helpers at design time.
     */
    showCameraHelpersAtDesignTime: Observable<boolean, never>;
    /**
     * Observable property to control the visibility of raycaster helpers at design time.
     */
    showRaycasterHelpersAtDesignTime: Observable<boolean, never>;
}
/**
 * Utility function to access the observable property for showing camera helpers at design time within a ContextManager.
 *
 * @param {ContextManager} mgr - The context manager instance.
 */
export declare function useShowCameraHelpersAtDesignTime(mgr: ContextManager): Observable<boolean, never>;
/**
 * Utility function to access the observable property for showing raycaster helpers at design time within a ContextManager.
 *
 * @param {ContextManager} mgr - The context manager instance.
 * @return {Observable<boolean>} The observable property for showing raycaster helpers.
 */
export declare function useShowRaycasterHelpersAtDesignTime(mgr: ContextManager): Observable<boolean, never>;
export declare const helperSymbol: unique symbol;
export declare function registerHelper(obj: Object3D): void;
export declare function unregisterHelper(obj: Object3D): void;
export declare function isHelper(obj: Object3D): boolean;