export declare enum HistoryEvent {
    /**
     * <zh/> 当命令被撤销时
     *
     * <en/> When the command is undone
     */
    UNDO = "undo",
    /**
     * <zh/> 当命令被重做时
     *
     * <en/> When the command is redone
     */
    REDO = "redo",
    /**
     * <zh/> 当命令被取消时
     *
     * <en/> When the command is canceled
     */
    CANCEL = "cancel",
    /**
     *  <zh/> 当命令被添加到队列时
     *
     *  <en/> When the command is added
     */
    ADD = "add",
    /**
     * <zh/> 当历史队列被清空时
     *
     *  <en/> When the command queue is cleared
     */
    CLEAR = "clear",
    /**
     * <zh/> 当历史队列发生变化时
     *
     * <en/> When the command queue changes
     */
    CHANGE = "change"
}