/**
 * System Stream Endpoint
 *
 * Stream endpoint for system-level events like heartbeat and connection lifecycle.
 *
 * @example
 * ```typescript
 * // Register in StreamRegistry
 * await StreamRegistry.initialize({
 *   broadcaster: streamServer.getBroadcaster(),
 *   endpoints: [
 *     { endpoint: SystemStreamEndpoint, config: { enabled: true } },
 *   ],
 * });
 * ```
 */
import { BaseStreamEndpoint } from '../../base/BaseStreamEndpoint';
import type { BaseChannelController } from '../../channels/BaseChannelController';
import type { StreamEndpointConfig, StreamEndpointCreateOptions, StreamConnection } from '@plyaz/types/core';
/**
 * SystemStreamEndpoint - Handles system-level streaming events
 *
 * Channels managed:
 * - `system` - System events (heartbeat, connected, disconnected)
 */
export declare class SystemStreamEndpoint extends BaseStreamEndpoint {
    /** Static endpoint key for registry lookup */
    static readonly endpointKey = "system";
    /** Heartbeat interval in milliseconds */
    private readonly heartbeatInterval;
    constructor(config: StreamEndpointConfig, options: StreamEndpointCreateOptions);
    /**
     * Create channel controller for this endpoint.
     */
    protected createChannelController(): BaseChannelController;
    /**
     * Initialize event subscriptions.
     * Called by StreamRegistry during initialization.
     */
    initialize(): void;
    /**
     * Called when a new connection is established.
     * Broadcasts a connected event.
     */
    protected onConnect(connection: StreamConnection): Promise<void>;
    /**
     * Called when a connection is closed.
     * Broadcasts a disconnected event.
     */
    protected onDisconnect(connectionId: string): Promise<void>;
    /**
     * Static factory method for creating endpoint instances.
     *
     * @param config - Endpoint configuration
     * @param options - Create options (broadcaster, auth, etc.)
     * @returns Promise resolving to endpoint instance
     */
    static create(config: StreamEndpointConfig, options: StreamEndpointCreateOptions): Promise<SystemStreamEndpoint>;
}
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