import type { Repositories } from "../repositories/index.js";
export interface UpdateNotification {
    installed_version: string;
    available_version: string;
    changelog: string;
    releases_url: string;
}
export declare class UpdateService {
    private repos;
    private currentVersion;
    /** Ensures we only surface the notification once per server process. */
    private _notifiedThisProcess;
    constructor(repos: Repositories, currentVersion: string);
    /**
     * Fire-and-forget: schedule an async update check via setImmediate so it
     * never blocks server startup. All errors are swallowed — update checking
     * is strictly best-effort.
     */
    scheduleCheck(): void;
    /**
     * Returns an update notification if a newer version is available.
     * Only returns a value once per process lifetime to avoid spamming the
     * agent on every engram_start_session call.
     */
    getNotification(): UpdateNotification | null;
    private _check;
    private _fetchLatest;
}
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