export function isValidUrl(url: any): boolean;
export function isOnlineUrl(url: any): boolean;
export function isDataUrl(url: any): boolean;
/**
 * 深度对比两个对象是否一致
 * from: https://github.com/epoberezkin/fast-deep-equal
 * @param  {Object} a 对象a
 * @param  {Object} b 对象b
 * @return {Boolean}   是否相同
 */
export function equal(a: any, b: any): boolean;