/**
 * parse/preload a font face
 * @param {loader.Asset} data - asset data
 * @param {Function} [onload] - function to be called when the asset is loaded
 * @param {Function} [onerror] - function to be called in case of error
 * @returns {number} the amount of corresponding resource parsed/preloaded
 * @ignore
 * @example
 * preloadFontFace([
 *     { name: "'kenpixel'", type: "fontface", src: "data/font/kenvector_future.woff2" }
 * ]);
 */
export function preloadFontFace(data: loader.Asset, onload?: Function, onerror?: Function): number;
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