Extend material Button with Typescript

Butto.jsx

import * as React from 'react';
import { withStyles, WithStyles, StandardProps } from 'material-ui';
import MButton, { ButtonProps, ButtonClassKey } from 'material-ui/Button';
// import { compose } from 'recompose';

let styles = {
  small: {
    minWidth: 64,
    minHeight: 32,
  }
};

type ClassKey =
  | ButtonClassKey
  | 'small';

interface Props extends StandardProps<
  ButtonProps,
  ClassKey
> {
  small?: Boolean;
}

class Button extends React.Component<Props & WithStyles<ClassKey>> {
  render() {
    return <MButton {...this.props} />;
  }
}

export default withStyles(styles)<Props>(Button);