talk/plugins/talk-plugin-facebook-auth/client/components/FacebookButton.js

import React from 'react';
import { BareButton } from 'plugin-api/beta/client/components/ui';
import styles from './FacebookButton.css';

export default ({ onClick, children }) => {
  return (
    <BareButton className={styles.button} onClick={onClick}>
      {children}
    </BareButton>
  );
};