import { IExtensionFactory, IExtensionInstance } from "../IExtension";
import GltfLoader from "../../io/GltfLoader";
import Light from "nanogl-pbr/lighting/Light";
/**
 * Interface representing a light with its name and index in a list
 */
export interface LightItemCollection {
    name: string;
    index: number;
}
/**
 * Class to manage a collection of lights
 */
export declare class LightCollection {
    /**
     * List of lights
     */
    list: Light[];
    /**
     * List of lights with their name and index in the list
     */
    _items: Array<LightItemCollection>;
    constructor();
    /**
     * Add a light to the collection
     * @param light Light to add
     * @param name Light's name
     */
    addLight(light: Light, name?: string): void;
    /**
     * Get a light from this collection by its name
     * @param name Light's name to get
     */
    getLightByName(name: string): Light;
    /**
     * Get a list of lights from this collection by their name
     * @param name Lights' name to get
     */
    getLightsByName(name: string): Array<Light>;
}
/**
 * This extension allows to define in a glTF file a set of lights that can be used by the scene.
 * The 3 possible types of lights (directional, spot and point) will be created as nanogl-pbr DirectionalLight,
 * SpotLight and PointLight, and added to the Node they are linked to.
 */
export default class KHR_lights_punctual implements IExtensionFactory {
    readonly name: string;
    createInstance(gltfLoader: GltfLoader): IExtensionInstance;
}