/** Renew cadence — well under the 5-min lease so a renewed lease always has minutes of headroom (a
 *  missed tick still has time to recover before the lease expires). */
export declare const DEFAULT_LEASE_RENEW_INTERVAL_MS = 120000;
export interface LeaseRenewerDeps {
    /** The run being kept alive (for correlation/logging). */
    runId: string;
    /** Extend the lease; resolves true while we still hold it, false once it's definitively lost
     *  (brokered: `RunnerControlClient.renewLease` → `POST /renew`). */
    renew: () => Promise<boolean>;
    /** Fired exactly once the first time the lease is seen to be lost. */
    onLost: () => void;
    intervalMs?: number;
}
export declare class LeaseRenewer {
    private readonly deps;
    private timer;
    private firing;
    private lost;
    private stopped;
    constructor(deps: LeaseRenewerDeps);
    /** Begin periodic lease renewal. */
    start(): void;
    /** Stop renewing and drain any in-flight renew. Idempotent. */
    stop(): Promise<void>;
    /** Whether the lease was definitively lost (the orchestrator may read this to shape the outcome). */
    isLost(): boolean;
    /** True once the renewer should no longer act. A method (re-evaluated after an `await`) so `stop()`
     *  can flip `stopped` mid-tick. */
    private done;
    private tick;
}