/** This file must only contain pure code and pure imports */
import { AssetContainer } from "@babylonjs/core/assetContainer.js";
import { type ISceneLoaderAsyncResult, type ISceneLoaderPluginAsync, type ISceneLoaderPluginFactory, type ISceneLoaderProgressEvent, type SceneLoaderPluginOptions } from "@babylonjs/core/Loading/sceneLoader.js";
import { type Scene } from "@babylonjs/core/scene.pure.js";
import { type USDFileLoaderOptions } from "./usdLoadingOptions.js";
/**
 * OpenUSD scene loader backed by a WebAssembly command-buffer extractor.
 */
export declare class USDFileLoader implements ISceneLoaderPluginAsync, ISceneLoaderPluginFactory {
    /**
     * Default URLs for the prebuilt OpenUSD importer assets.
     */
    static DefaultConfiguration: {
        glueUrl: string;
        wasmUrl: string;
        dataUrl: string;
        workerUrl: string;
    };
    /**
     * Defines the name of the plugin.
     */
    readonly name: "usd";
    /**
     * Defines the extensions the plugin can load.
     */
    readonly extensions: {
        readonly ".usd": {
            readonly isBinary: true;
        };
        readonly ".usda": {
            readonly isBinary: true;
        };
        readonly ".usdc": {
            readonly isBinary: true;
        };
        readonly ".usdz": {
            readonly isBinary: true;
        };
    };
    private readonly _options;
    private _worker;
    private _workerUrl;
    private _workerBlobUrl;
    private _nextRequestId;
    private readonly _pending;
    private readonly _activeLoads;
    /**
     * Creates a USD loader.
     * @param options Options controlling worker assets, supporting files, and diagnostics.
     */
    constructor(options?: Partial<USDFileLoaderOptions>);
    /**
     * Creates a configured plugin instance for a SceneLoader operation.
     * @param options SceneLoader plugin options.
     * @returns The configured USD loader.
     */
    createPlugin(options: SceneLoaderPluginOptions): ISceneLoaderPluginAsync;
    /**
     * Imports all objects from a USD stage into a scene.
     * @param _meshesNames Mesh name filtering is not currently supported.
     * @param scene The scene receiving the imported objects.
     * @param data The USD, USDA, USDC, or USDZ bytes.
     * @param rootUrl The source root URL.
     * @param onProgress SceneLoader progress callback.
     * @param fileName Name of the root USD layer.
     * @returns The imported Babylon.js objects.
     */
    importMeshAsync(_meshesNames: string | readonly string[] | null | undefined, scene: Scene, data: unknown, rootUrl: string, onProgress?: (event: ISceneLoaderProgressEvent) => void, fileName?: string): Promise<ISceneLoaderAsyncResult>;
    /**
     * Loads a USD stage into a scene.
     * @param scene The scene receiving the imported objects.
     * @param data The USD, USDA, USDC, or USDZ bytes.
     * @param rootUrl The source root URL.
     * @param onProgress SceneLoader progress callback.
     * @param fileName Name of the root USD layer.
     */
    loadAsync(scene: Scene, data: unknown, rootUrl: string, onProgress?: (event: ISceneLoaderProgressEvent) => void, fileName?: string): Promise<void>;
    /**
     * Loads a USD stage into an asset container.
     * @param scene The scene used to create imported objects.
     * @param data The USD, USDA, USDC, or USDZ bytes.
     * @param rootUrl The source root URL.
     * @param onProgress SceneLoader progress callback.
     * @param fileName Name of the root USD layer.
     * @returns The populated asset container.
     */
    loadAssetContainerAsync(scene: Scene, data: unknown, rootUrl: string, onProgress?: (event: ISceneLoaderProgressEvent) => void, fileName?: string): Promise<AssetContainer>;
    /**
     * Releases the worker and rejects pending loads.
     */
    dispose(): void;
    private _loadAsync;
    private _getWorker;
    private _terminateWorker;
}
/** @internal */
export declare function _RegisterUSDLoaderDependencies(): void;
/**
 * Registers the USD scene loader plugin and its Babylon.js runtime dependencies.
 * Safe to call multiple times; only the first call has an effect.
 */
export declare function RegisterUSDFileLoader(): void;