export declare class ObjectUtils {
    static isObject(obj: any): boolean;
    /**
     *
     * @param obj
     * @param options{filterFun,removeKeys,circulate}
     * @returns {any}
     */
    static filter(obj: any, options?: any): any;
    private static filterNull;
    /**
     * 移除key
     * @param obj: 被操作的对象
     * @param filterFun
     * @param removeKeys
     */
    private static removeKey;
    /**
     * 深拷贝
     * @param origin
     * @param target
     */
    static clone(origin: any, target?: {}): {};
}
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