import type { HeartbeatTunnelParams } from '../_vendored-contracts/skill-tunnel.js';
export interface HeartbeatOptions {
    /** 构造每次 heartbeat 的 local_skill_status 快照 */
    buildStatusSnapshot: () => HeartbeatTunnelParams['local_skill_status'];
    /** 发 heartbeat request（由 client 负责 JSON-RPC 封装 + WS send）*/
    sendHeartbeat: (params: HeartbeatTunnelParams) => Promise<void>;
    /** 心跳超时回调（调用方通常触发重连）*/
    onTimeout: () => void;
    /** 可选: 测试时注入 clock */
    nowMs?: () => number;
    /** 可选: 覆盖 interval（默认 25s）*/
    intervalMs?: number;
    /** 可选: 覆盖 timeout（默认 60s）*/
    timeoutMs?: number;
}
export declare class HeartbeatLoop {
    private readonly opts;
    private interval;
    private timeoutTimer;
    private lastAckAt;
    private started;
    constructor(opts: HeartbeatOptions);
    start(): void;
    stop(): void;
    /** 收到 heartbeat ack (JSON-RPC success response) —— 上层 client 调用 */
    onAck(): void;
    /** 暴露给测试: 手动触发一次 tick */
    tick(): Promise<void>;
    /** 暴露给测试: 手动触发一次超时检查 */
    checkTimeout(): void;
    private scheduleTimeoutCheck;
    get lastAck(): number;
}
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