/**
 * System Channel Controller
 *
 * Handles system-level streaming channels: heartbeat, connection lifecycle.
 */
import { BaseChannelController } from '../../channels/BaseChannelController';
import type { StreamBroadcasterInterface } from '@plyaz/types/core';
/**
 * SystemChannelController - Handles system streaming channels
 *
 * Channels:
 * - `system` - System-level events (heartbeat, connected, disconnected)
 */
export declare class SystemChannelController extends BaseChannelController {
    /** Heartbeat interval timer */
    private heartbeatTimer?;
    /** Heartbeat interval in milliseconds */
    private readonly heartbeatInterval;
    constructor(heartbeatInterval?: number);
    /**
     * Initialize event subscriptions.
     * Sets up heartbeat broadcasting.
     */
    initialize(broadcaster: StreamBroadcasterInterface): void;
    /**
     * Override handlesChannel to match system patterns.
     */
    handlesChannel(channel: string): boolean;
    /**
     * Override dispose to clean up heartbeat timer.
     */
    dispose(): void;
    /**
     * Broadcast a connection established event.
     */
    broadcastConnected(broadcaster: StreamBroadcasterInterface, connectionId: string): void;
    /**
     * Broadcast a connection closed event.
     */
    broadcastDisconnected(broadcaster: StreamBroadcasterInterface, connectionId: string): void;
}
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