import * as THREE from 'three';
import { ImageTracker } from '../defaultpipeline.js';
/**
 * Loader for image trackers.
 * @see https://docs.zap.works/universal-ar/web-libraries/threejs/image-tracking/
 */
export declare class ImageTrackerLoader extends THREE.Loader {
    /**
     * Loads an image tracker.
     * New THREE.js style signature (required by Loader base class)
     */
    load(url: string, onLoad: (data: ImageTracker) => void, onProgress?: (event: ProgressEvent<EventTarget>) => void, onError?: (err: unknown) => void): void;
    /**
     * Loads an image tracker.
     * Original backward-compatible signature
     * @param zpt - A URL to, or ArrayBuffer of, an image target file.
     * @param onLoad - Callback which returns the imageTracker once it's loaded.
     * @param onError - Callback which is called if there's an error loading the target file.
     * @returns The ImageTracker.
     * @see https://docs.zap.works/universal-ar/zapworks-cli/
     */
    load(zpt: string, onLoad?: (i: ImageTracker) => void, onProgress?: () => void, onError?: (message?: unknown) => void): ImageTracker;
    /**
     * @ignore
     */
    parse(): void;
}