import React from 'react';
interface Props {
    activeTheme: string;
    onChangeTheme: (theme: string) => void;
}
export declare class ThemeSwitcher extends React.Component<Props> {
    previewEl: HTMLIFrameElement | null;
    poll: number | undefined;
    componentDidMount(): void;
    componentWillUnmount(): void;
    render(): JSX.Element;
}
export {};