export declare class Modal {
    private verificationWindow;
    private escKeyHandler;
    private loadingSpinner;
    constructor();
    private setupStyles;
    openIframe(url: string, onClose?: () => void): void;
    close(): void;
    private cleanup;
    getWindow(): HTMLIFrameElement | null;
    isOpen(): boolean;
    updateHeight(height: number): void;
    hideLoading(): void;
}