import { Parser } from ".";
import { Message } from "./types";
declare class WebSocketManager {
    private static instance;
    private webSocket;
    private messageListeners;
    private constructor();
    static getInstance(): WebSocketManager;
    connect(url: string | URL): void;
    private handleMessage;
    addMessageListener(listener: (message: string) => void): void;
    removeMessageListener(listener: (message: string) => void): void;
}
declare function getWebSocketURL(): string;
declare function getBfaceURL(uid: string | number): string;
interface onMessageOptions {
    customWsServer?: string | URL;
}
declare function onMessage(callback: (message: Message, parser: Parser) => void, options?: onMessageOptions): void;
export { WebSocketManager, getBfaceURL, getWebSocketURL, onMessage };