export interface HeartbeatConfig {
    interval: number;
    checkFn: () => Promise<string>;
}
export declare class HeartbeatManager {
    private config;
    private timer;
    private callbacks;
    private lastBeat;
    constructor(config: HeartbeatConfig);
    start(): void;
    stop(): void;
    onBeat(callback: (status: string) => void): void;
    getLastBeat(): {
        timestamp: number;
        status: string;
    } | null;
}
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