import { TBus } from './interface';
import { Transport } from './Transport';
export declare class TransportIframe extends Transport<HTMLIFrameElement> {
    private _timer;
    private readonly _url;
    private _iframe;
    private _bus;
    constructor(url: string, queueLength: number);
    get(): HTMLIFrameElement;
    protected _dropTransportConnect(): void;
    protected _getBus(): Promise<TBus>;
    protected _beforeShow(): void;
    protected _afterShow(): void;
    private _initIframe;
    private _addIframeToDom;
    private _createIframe;
    private _showIframe;
    private _hideIframe;
    private _applyStyle;
    private _renderErrorPage;
    private _listenFetchURLError;
}
export declare function isBrave(): boolean;
export declare function isSafari(): boolean;