import { IEntity } from '@ibizstudio/api';
/**
 * 数据历史状态管理
 *
 * @export
 * @class DataHistory
 */
export declare class DataHistory {
    /**
     * 历史数据列表
     *
     * @type {IEntity[]}
     * @memberof DataHistory
     */
    readonly historyList: IEntity[];
    /**
     * 待前进数据
     *
     * @type {IEntity[]}
     * @memberof DataHistory
     */
    readonly forwardList: IEntity[];
    /**
     * 新增历史数据
     *
     * @param {*} item
     * @return {*}  {*}
     * @memberof DataHistory
     */
    add(item: IEntity): IEntity;
    /**
     * 数据回退
     *
     * @return {*}  {*}
     * @memberof DataHistory
     */
    backOff(): IEntity | null;
    /**
     * 数据回退前进
     *
     * @return {*}  {*}
     * @memberof DataHistory
     */
    forward(): IEntity | null;
}
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