docs/src/components/DocToc.jsx

import React from 'react'
import PropTypes from 'prop-types'
import styles from './DocToc.module.scss'

const DocToc = ({ tableOfContents }) => (
  <aside
    className={styles.toc}
    dangerouslySetInnerHTML={{ __html: tableOfContents }}
  />
)

DocToc.propTypes = {
  tableOfContents: PropTypes.string.isRequired
}

export default DocToc