export interface HeartbeatTimerHandle {
    unref(): void;
    clear(): void;
}
export interface HeartbeatTimerScheduler {
    schedule(callback: () => void, intervalMs: number): HeartbeatTimerHandle;
}
export declare class NodeHeartbeatTimerScheduler implements HeartbeatTimerScheduler {
    schedule(callback: () => void, intervalMs: number): HeartbeatTimerHandle;
}
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