export declare function arrayTreeFilter<T>(data: T[], filterFn: (item: T, level: number) => boolean, options?: {
    childrenKeyName?: string;
}): T[];
/**
 * 判断元素是否在数组最后一位
 * @param length 数组长度
 * @param i 循环下标
 * @returns
 */
export declare const last: (length: number, i: number) => boolean;