/**
 * 以 Promise 或者 Callback 的方式加载 js 文件，取决于是否传递 Callback
 * @param {string}  url  js文件路径
 * @param {function}  [cb]  回调
 * @returns {Promise<number>} promise
 */
export declare const loaderUnity: (source: string, cb?: Function, ...args: Array<any>) => void | Promise<unknown>;
export declare const loader: (source: string, cb?: Function, ...args: Array<any>) => void | Promise<unknown>;