import type { DataTexture, Group, Loader, LoadingManager, Texture } from 'three';
import type { GLTF } from 'three/examples/jsm/loaders/GLTFLoader';
type BaseOptions = {
    url: string;
    onProgress?: (event: ProgressEvent) => void;
    onError?: (event: ErrorEvent) => void;
    customLoadingManager?: LoadingManager;
};
type LoadGLTFOptions = {
    isCache?: boolean;
    isBackward?: boolean;
    autoBackward?: boolean;
    onLoad?: (gltf: GLTF) => void;
    draco?: boolean;
    dracoPath?: string;
    simplifierRatio?: number;
} & BaseOptions;
type loadGLTFToBuffer = {
    isBackward?: boolean;
    autoBackward?: boolean;
    draco?: boolean;
    dracoPath?: string;
    simplifierRatio?: number;
    url: string;
};
type LoadTextureOptions = {
    onLoad?: (texture: Texture) => void;
} & BaseOptions;
type LoadFBXOptions = {
    isCache?: boolean;
    onLoad?: (scene: Group) => void;
} & BaseOptions;
/**
 * @file LoaderModule
 * main solve
 * 1. 统一load使用
 * 2. gltf load资源缓存 「1.资源可以通过http缓存 2.gltf解析结果缓存」
 * 3. load进度规范管理
 * 4. 批量glb 多线程预加载 todo
 */
declare class LoaderModule {
    private gltfLoader;
    private dracoLoader;
    constructor();
    cleanCache(): void;
    /**
     * load GLTF To Buffer
     * @param args
     * @returns
     */
    loadGLTFToBuffer(args: loadGLTFToBuffer): Promise<ArrayBuffer>;
    /**
     * 初始化或更新DRACO解码器
     * @param decoderPath DRACO解码器路径
     */
    private setupDracoLoader;
    /**
     * load gltf
     * note: isBackward = true , onProgress is not work
     * TODO 资源缓存保持和http缓存具有一致的清除机制 「但是单方面目前做不到，库项目使用Service Worker目前不太友好」
     * @param args
     * @returns
     */
    loadGLTF(args: LoadGLTFOptions): Promise<GLTF>;
    /**
     * load fbx
     * @param args
     * @returns
     */
    loadFbx(args: LoadFBXOptions): Promise<Group>;
    /**
     * load texture
     * @param args
     * @returns
     */
    loadTexture(args: LoadTextureOptions): Promise<Texture>;
    /**
     * loadRgbe
     * @param args
     * @returns
     */
    loadRgbe(args: LoadTextureOptions): Promise<DataTexture>;
    extend(load: Loader): Loader<unknown, string>;
}
export default LoaderModule;