import { GLTFExporter } from "three/examples/jsm/exporters/GLTFExporter.js";
import { GLTFLoader } from "three/examples/jsm/loaders/GLTFLoader.js";
import { Context } from "../engine_setup.js";
import { GLTF } from "../engine_types.js";
import { NEEDLE_components } from "./NEEDLE_components.js";
declare type OnImportCallback = (loader: GLTFLoader, url: string, context: Context) => void;
declare type OnExportCallback = (exporter: GLTFExporter, context: Context) => void;
/**
 * Interface for registering custom glTF extensions to the Needle Engine GLTFLoaders. Register your plugin via {@link addCustomExtensionPlugin}
 */
export interface INeedleGLTFExtensionPlugin {
    /** The Name of your plugin */
    name: string;
    /** Called before starting to load a glTF file. This callback can be used to add custom extensions to the GLTFLoader */
    onImport?: OnImportCallback;
    /** Called after the glTF has been loaded */
    onLoaded?: (url: string, gltf: GLTF, context: Context) => void;
    /** Called before starting to export a glTF file. This callback can be used to add custom extensions to the GLTFExporter */
    onExport?: OnExportCallback;
}
/** Register callbacks for registering custom gltf importer or exporter plugins */
export declare function addCustomExtensionPlugin(ext: INeedleGLTFExtensionPlugin): void;
/** Unregister callbacks for registering custom gltf importer or exporter plugins */
export declare function removeCustomImportExtensionType(ext: INeedleGLTFExtensionPlugin): void;
/** Registers the Needle Engine components extension */
export declare function registerComponentExtension(loader: GLTFLoader): NEEDLE_components;
export declare function registerExtensions(loader: GLTFLoader, context: Context, url: string): Promise<void>;
export declare function registerExportExtensions(exp: GLTFExporter, context: Context): void;
/** @internal */
export declare function invokeAfterImportPluginHooks(url: string, gltf: GLTF, context: Context): void;
export {};