import type { WebSocket } from 'ws';
import type { ClientBridgeEvent, IClientBridge } from '../../types/public-types.js';
export declare class NodeClientBridge implements IClientBridge {
    private subscribers;
    private heartbeatTimer;
    constructor();
    /**
     * Pings all open subscribers and removes any that are no longer in OPEN state.
     * This prevents a slow memory leak caused by zombie connections that never
     * send a close event (e.g. abruptly killed browsers, orphaned tabs, network drops).
     */
    private sweep;
    subscribe(ws: WebSocket): void;
    unsubscribe(ws: WebSocket): void;
    broadcast(event: ClientBridgeEvent): void;
    reload(): void;
    cssUpdate(path: string): void;
    update(path: string): void;
    error(message: string): void;
    get subscriberCount(): number;
    /**
     * Stops the heartbeat timer and clears all subscribers.
     * Call this when the dev server is shutting down.
     */
    destroy(): void;
    [Symbol.dispose](): void;
}