export interface RestartState {
    id: string;
    phase: string;
    oldPid?: number;
    candidatePid?: number;
    candidateRelease?: string;
    previousRelease?: string;
    startedAt: string;
    updatedAt: string;
    error?: string;
    /** 本次重启是否由自动升级触发（NIUBOT_AUTO_UPDATE=1 写入）；供新引擎早晨汇报判定。 */
    autoUpdate?: boolean;
    /** 自动升级成功通知已送达；跨 Engine 重启去重。 */
    autoUpdateReportedAt?: string;
}
export declare function readRestartState(stateFile: string, expectedId?: string): RestartState | undefined;
export declare class RestartStateWriter {
    readonly botDirectory: string;
    readonly id: string;
    readonly startedAt: string;
    readonly directory: string;
    readonly stateFile: string;
    /** 本次重启是否自动升级触发：构造时固定，write 自动带上（贯穿整个 worker 生命周期） */
    private readonly autoUpdate;
    constructor(botDirectory: string, id: string, startedAt: string, autoUpdate?: boolean);
    write(phase: string, values?: Partial<Omit<RestartState, "id" | "phase" | "startedAt" | "updatedAt">>): RestartState;
    read(): RestartState | undefined;
}
/** 持久标记自动升级结果已通知，避免进程重启后重复发送。 */
export declare function markAutoUpdateReported(stateFile: string, expectedId: string): boolean;