export declare const check: (arr: any[], value: any) => boolean;
export declare const isValueNull: (v: any) => boolean;
export declare function isArray(val: any): val is Array<any>;
export declare function isValueArray(val: unknown): val is ArrayLike<unknown>;
export declare function normalizeArray<T>(value?: T | T[]): T[];
type callback = (item: any, index: number, parent?: any) => void;
type loopForEachCallback = callback | callback[];
/**
 * 递归遍历array，执行 callback
 * @param array 数据源
 * @param children  子节点字段 | `callback`
 * @param callback 回调函数 `() => void` | `Array<() => void>` | `parent`
 * @param parent 上级节点
 */
export declare function loopForEach(array: any[] | undefined, children: string, callback: loopForEachCallback, parent?: any): void;
export declare function loopForEach(array: any[] | undefined, callback: loopForEachCallback, parent?: any): void;
/**
 * 递归找出某级所有节点
 */
export declare function loopSomeLevelALLChildren(lists: any[], childrenKey: string, level: number): any[];
export declare function loopSomeLevelALLChildren(lists: any[], childrenKey: number): any[];
export {};