/**
 * Configuration for an off-loop liveness ticker (passed via `workerData`).
 */
export interface LivenessTickerOptions {
    /** Database URL the owning runner is using. */
    url: string;
    /** Optional explicit engine/type hint. */
    type?: string;
    /** This runner incarnation's worker key (the `_smrt_workers.worker_id`). */
    workerKey: string;
    /** Lease time-to-live in milliseconds. */
    leaseTtlMs: number;
    /** Renewal cadence in milliseconds. */
    leaseTickMs: number;
}
export interface LivenessTicker {
    /** Stop renewing and close the connection. */
    stop: () => Promise<void>;
}
/**
 * Renew a worker's liveness lease from *outside* the handler event loop.
 *
 * Runs on a `node:worker_threads` thread (or, in tests, directly) with its own
 * database connection, so a CPU-bound synchronous handler on the main thread
 * cannot starve the renewal — the failure mode that made the old heartbeat
 * false-recover running jobs (#1474). A dead process stops renewing and the
 * lease expires within its TTL, which is how recovery detects death.
 */
export declare function runLivenessTicker(options: LivenessTickerOptions): Promise<LivenessTicker>;
//# sourceMappingURL=worker-liveness-ticker.d.ts.map