import type { FsDuplexBrowserHelper } from "./browser.js";
/**
 * Reads the heartbeat file in Node.js to check for liveness.
 */
export declare class NodeHeartbeatReader {
    private filepath;
    constructor(filepath: string);
    /**
     * Checks if the heartbeat timestamp is recent.
     * @param timeout The maximum allowed age of the heartbeat in milliseconds.
     * @returns True if the peer is considered alive, false otherwise.
     */
    isAlive(timeout: number): Promise<boolean>;
}
/**
 * Writes the heartbeat file periodically in the Browser.
 */
export declare class BrowserHeartbeatWriter {
    private filename;
    private helper;
    private interval;
    private timer;
    constructor(filename: string, helper: FsDuplexBrowserHelper, interval?: number);
    /**
     * Starts the periodic writing of the heartbeat file.
     */
    start(): void;
    /**
     * Stops writing the heartbeat.
     */
    stop(): void;
    private _writeHeartbeat;
}
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