/**
 * 判断是否是一个普通对象
 * @param obj 任意值
 * @returns boolean
 */
export declare function isPlainObject(obj: any): boolean;
/**
 * 判断是否json字符串
 * @param str 任意值
 * @returns boolean
 */
export declare const isJSONString: (str: any) => boolean;
export declare function isString(str: any): boolean;
export declare function isNumer(value: any): boolean;
export declare function uniqueByProperty(arr: any, prop: any): any;