import * as React from 'react';
declare type UnderlineButtonProps = {
    onClick: (...args: any[]) => any;
    editor?: any;
};
declare class UnderlineButton extends React.Component<UnderlineButtonProps, {}> {
    static defaultProps: {
        editor: any;
    };
    onClick: (e: any) => void;
    isDisabled: () => boolean;
    render(): JSX.Element;
}
export default UnderlineButton;