export declare const CLOSED_TASK_STATUSES: readonly ["done", "cancelled"];
/** 任务状态(active 进行中;done/cancelled 已关闭)。 */
export type TaskStatus = "active" | "done" | "cancelled";
/** 需 active 任务的动作(集中定义,治 L 状态校验分散:advance/cancel/reset/setDomainFocus 各自重复判断)。
 *  deliver 不在此:它对 closed 幂等(返 already_closed success),语义相反,保留各自判断。 */
export type TaskAction = "advance" | "cancel" | "reset" | "setDomainFocus";
/** status 下是否允许 action(advance/cancel/reset/setDomainFocus 仅 active 允许)。
 *  集中状态机入口,manager 与 handler 复用,新增 handler 不易遗漏状态校验。 */
export declare function canTaskAction(action: TaskAction, status: TaskStatus): boolean;
/** updateStatus 状态转换:active 可转任意;closed 仅 noop(同状态)允许;closed 转不同状态禁止。
 *  等价原 manager 的 `from !== to && from !== active` throw 条件取反。 */
export declare function canUpdateStatus(from: TaskStatus, to: TaskStatus): boolean;