import type { WsClient } from './WsClient.js';
/**
 * Registry that maps room names to the set of clients currently in them.
 * A single WsRoom instance is shared across all WsGateway subclasses
 * registered via the same WsServiceProvider.
 */
export declare class WsRoom {
    private readonly rooms;
    /**
     * Add a client to a room.
     *
     * @param client - the client to add
     * @param room   - room name
     */
    join(client: WsClient, room: string): void;
    /**
     * Remove a client from a room.
     *
     * @param client - the client to remove
     * @param room   - room name
     */
    leave(client: WsClient, room: string): void;
    /**
     * Remove a client from all rooms. Call on disconnect.
     *
     * @param client - the disconnecting client
     */
    removeAll(client: WsClient): void;
    /**
     * Broadcast a JSON event to all clients in a room.
     * Skips clients whose socket is not in OPEN state.
     *
     * @param room    - room name
     * @param event   - event name
     * @param payload - JSON-serialisable data
     */
    broadcast(room: string, event: string, payload: unknown): void;
    /**
     * Returns the number of connected clients in a room.
     *
     * @param room - room name
     * @returns client count
     */
    size(room: string): number;
}
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