import { ContextManager, Observable } from '@zcomponent/core';
import * as THREE from 'three';
import { Light, LightConstructorProps } from './Light';
/**
 * Interface for constructor properties of DirectionalLight.
 */
export type DirectionalLightConstructorProps = LightConstructorProps;
/**
 * A light that emits light in a single uniform direction with rays parallel to each other. A directional light imitates a light source that is infinitely far away like the sun and is often used to represent sunlight.
 *
 * While the position of a DirectionalLight does not influence the lighting of objects (only its rotation does), the position does influence shadows. For this reason, a DirectionalLight should be positioned such that any geometry that should receive or cast shadows is in front of it.
 *
 * Root element: [THREE.DirectionalLight](https://threejs.org/docs/index.html?q=SpotLig#api/en/lights/DirectionalLight)
 *
 *
 * @zcomponent
 * @zgroup Lights
 * @zicon light
 * @ztag three/Object3D/Light/DirectionalLight
 * @zparents three/Object3D/Group/**
 */
export declare class DirectionalLight extends Light<THREE.DirectionalLight> {
    /**
     * Constructs a DirectionalLight.
     * @param contextManager - The context manager.
     * @param props - The properties required to construct a DirectionalLight.
     */
    constructor(contextManager: ContextManager, props: DirectionalLightConstructorProps);
    /**
     * Shadow camera's left plane.
     * @zprop
     * @zgroup Shadow Camera
     * @zgrouppriority 4
     * @zdefault -5
     */
    shadowCameraLeft: Observable<number, never>;
    /**
     * Shadow camera's right plane.
     * @zprop
     * @zgroup Shadow Camera
     * @zgrouppriority 4
     * @zdefault 5
     */
    shadowCameraRight: Observable<number, never>;
    /**
     * Shadow camera's top plane.
     * @zprop
     * @zgroup Shadow Camera
     * @zgrouppriority 4
     * @zdefault 5
     */
    shadowCameraTop: Observable<number, never>;
    /**
     * Shadow camera's bottom plane.
     * @zprop
     * @zgroup Shadow Camera
     * @zgrouppriority 4
     * @zdefault -5
     */
    shadowCameraBottom: Observable<number, never>;
    /**
     * Shadow camera near plane distance.
     * @zprop
     * @zgroup Shadow Camera
     * @zgrouppriority 4
     * @zdefault 0.5
     */
    shadowCameraNear: Observable<number, never>;
    /**
     * Shadow camera far plane distance.
     * @zprop
     * @zgroup Shadow Camera
     * @zgrouppriority 4
     * @zdefault 500
     */
    shadowCameraFar: Observable<number, never>;
    /**
     * Whether the light will cast shadows. Default is false.
     * @zprop
     * @zgroup Light
     * @zgrouppriority 5
     * @zdefault false
     */
    castShadow: Observable<boolean, never>;
}