import { Subject } from 'rxjs';
import { MessageClient } from '../message-client';
import { MessageResponse } from '../message-response.type';
import { Message } from '../message.interface';
import { GET_NEW_ID, RESPONSES$, SEND } from '../selectors';
import { IFrameArg } from './iframe.type';
declare const TARGET: unique symbol;
export declare class IframeMessageClient extends MessageClient {
    private channelName;
    [RESPONSES$]: Subject<MessageResponse>;
    private [TARGET];
    constructor(channelName?: string, targetFrame?: IFrameArg);
    initialize(target: IFrameArg): void;
    [SEND]<T>(message: Message<T>): Promise<void>;
    protected [GET_NEW_ID](): string;
}
export {};