/**
 * parse/preload an image
 * @param {loader.Asset} img
 * @param {Function} [onload] - function to be called when the resource is loaded
 * @param {Function} [onerror] - function to be called in case of error
 * @param {Object} [settings] - Additional settings to be passed when loading the asset
 * @returns {number} the amount of corresponding resource parsed/preloaded
 * @ignore
 * @example
 * preloadImages([
 *     { name : 'image1', src : 'images/image1.png'},
 *     { name : 'image2', src : 'images/image2.png'},
 *     { name : 'image3', src : 'images/image3.png'},
 *     // compressed texture with fallback chain
 *     { name : 'image4', src : [
 *         'images/image4.astc.ktx',  // try ASTC first
 *         'images/image4.dds',       // then S3TC via DDS
 *         'images/image4.png'        // fallback to PNG
 *     ]}
 * ]);
 */
export function preloadImage(img: loader.Asset, onload?: Function, onerror?: Function, settings?: Object): number;
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