import { Backend } from "./Backend";
import { Message } from "./Message";
export declare abstract class Socket<T = any> {
    #private;
    get state(): "opened" | "closed";
    set onMessage(value: ((message: T) => void) | undefined);
    set onClose(value: (() => void) | undefined);
    set onOpen(value: (() => void) | undefined);
    constructor(backend: Backend, isOpen?: boolean);
    protected abstract processReceived(data: Message): T;
    protected abstract processSend(data: T): Message;
    send(message: T): void;
}