export interface WorkerLeaseHeartbeatOptions {
    leaseTtlMs: number;
    renew(): void;
    onFailure(error: Error): void;
}
/** Keeps one live in-process worker fence valid while provider or tool work is suspended. */
export declare class WorkerLeaseHeartbeat {
    private readonly options;
    private timer;
    private failure;
    constructor(options: WorkerLeaseHeartbeatOptions);
    start(): void;
    stop(): void;
    assertHealthy(): void;
}
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