declare const UPDATE_STEPS: readonly ["stage", "checkpoint", "stop", "snapshot", "install", "launch", "health", "restore"];
type UpdateStep = typeof UPDATE_STEPS[number];
declare const journalSchema: import("./boundaryDecoder").BoundarySchema<{
    readonly id: string;
    readonly host: string;
    readonly scope: "pane" | "both" | "cli";
    readonly version: string;
    readonly phase: "install" | "failed" | "launch" | "stage" | "checkpoint" | "stop" | "snapshot" | "health" | "restore" | "accepted" | "complete" | "needs-attention";
    readonly completed: ("install" | "launch" | "stage" | "checkpoint" | "stop" | "snapshot" | "health" | "restore")[];
    readonly helperPid: number | undefined;
    readonly setupPid: number | undefined;
    readonly setupExpiresAt: number | undefined;
    readonly updatedAt: string;
    readonly appUpdated: boolean;
    readonly cliUpdated: boolean;
    readonly hostReachable: boolean;
    readonly restored: {
        readonly panelId: string;
        readonly outcome: string;
        readonly reason: string;
    }[];
    readonly error: string | undefined;
}>;
export type UpdateJournal = ReturnType<typeof journalSchema.decode>;
/** Commit one complete journal image; a crash leaves either the old or new image. */
export declare function writeUpdateJson<T extends object>(file: string, value: T): void;
export declare function readUpdateJournal(file: string): UpdateJournal;
export interface UpdateSteps {
    /** Each step reconciles its recorded effect before repeating after a crash. */
    run(step: UpdateStep, journal: UpdateJournal): Promise<Partial<UpdateJournal>>;
}
export declare function executeUpdate(file: string, steps: UpdateSteps): Promise<UpdateJournal>;
/** No owned installer can still be writing. A needs-attention operation that
 *  stopped before finishing install may have a surviving installer child. */
export declare function updateLockReleasable(journal: UpdateJournal): boolean;
/** Publish a fully durable owner directory atomically; never expose an empty lock. */
export declare function claimUpdateLock(directory: string, id: string, statusFile: string): {
    id: string;
    statusFile: string;
    acquired: boolean;
};
/** Elect one releaser. A terminal journal plus a dead recorded releaser repairs a crashed cleanup. */
export declare function releaseUpdateLock(directory: string, id: string): void;
/** Process disappearance is not proof of a clean shutdown. */
export declare function assertUpdateQuiescence(directory: string, expected: {
    id: string;
    bootId: string;
    pid: number;
}): void;
export {};
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