/**
 * Options for the WebSocket server
 */
export interface WebSocketServerOptions {
    /**
     * WebSocket server port
     *
     * @default {@link DefaultWebSocketServerPort}
     */
    port?: number;
}
/**
 * Callback to close the WebSocket server
 */
export type CloseWebSocketServer = () => Promise<void>;
/**
 * Start the WebSocket server. Manages the first message sent by the client and the client pool ({@link connections}).
 *
 * @throws {Error} If the WebSocket server fails to start within 3 seconds.
 */
export declare const startWebSocketServer: ({ port, }: WebSocketServerOptions) => Promise<CloseWebSocketServer>;
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