/**
 * 数据是否为空，【null、undefined、空数组、空对象、空字符串】将被判断为空
 */
export declare const isEmpty: (data: any) => boolean;
/**
 * 遍历数组，返回新数组
 */
export declare function map<U extends any>(arr: any, fn: (value: any, index: number, array: any[]) => U): U[];
/**
 * 遍历数组，返回 true 跳出后续循环
 */
export declare function forEach<V extends any>(arrLike?: ArrayLike<V>, fn?: (value: V, index: number, array: ArrayLike<V>) => boolean | void): void;
/**
 * 创建短字符唯一ID
 * ref https://stackoverflow.com/questions/1349404/generate-random-string-characters-in-javascript
 */
export declare function createRandomId(): string;