/**
 * Terminal Heartbeat Monitor
 */
import { EventEmitter } from 'events';
import { TerminalRegistry } from './registry';
import { TerminalHeartbeat } from './types';
/**
 * Configuration for heartbeat monitor
 */
export interface HeartbeatMonitorConfig {
    interval: number;
    timeout: number;
    maxMissedHeartbeats: number;
}
/**
 * Heartbeat Monitor - Monitors terminal health
 */
export declare class HeartbeatMonitor extends EventEmitter {
    private registry;
    private logger;
    private config;
    private checkInterval;
    private missedHeartbeats;
    private isRunning;
    constructor(registry: TerminalRegistry, config?: Partial<HeartbeatMonitorConfig>);
    /**
     * Start monitoring heartbeats
     */
    start(): void;
    /**
     * Stop monitoring heartbeats
     */
    stop(): void;
    /**
     * Check all terminal heartbeats
     */
    private checkHeartbeats;
    /**
     * Handle heartbeat event from terminal
     */
    private handleHeartbeat;
    /**
     * Handle missed heartbeat event
     */
    private handleMissedHeartbeat;
    /**
     * Process incoming heartbeat message
     */
    processHeartbeat(heartbeat: TerminalHeartbeat): void;
    /**
     * Get heartbeat statistics
     */
    getStatistics(): {
        monitoringTerminals: number;
        healthyTerminals: number;
        lateTerminals: number;
        missedHeartbeats: {
            [terminalId: string]: number;
        };
        averageHeartbeatAge: number;
    };
    /**
     * Force heartbeat check
     */
    forceCheck(): void;
    /**
     * Clear missed heartbeats for a terminal
     */
    clearMissedHeartbeats(terminalId: string): void;
    /**
     * Get missed heartbeat count for a terminal
     */
    getMissedHeartbeatCount(terminalId: string): number;
}
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