docs/components/landing/TableOfContents.tsx

import { useRouter } from 'next/router'
import cx from 'classnames'

import { ActionList } from '@primer/react'
import { Link } from 'components/Link'
import { BumpLink } from 'components/ui/BumpLink'
import type { TocItem } from 'components/context/ProductLandingContext'

type Props = {
  items: Array<TocItem>
  variant?: 'compact' | 'expanded'
}
export const TableOfContents = (props: Props) => {
  const { items, variant = 'expanded' } = props
  const router = useRouter()

  return (
    <ul
      data-testid="table-of-contents"
      className={cx(variant === 'compact' ? 'list-style-outside pl-2' : 'list-style-none')}
    >
      <ActionList variant="full">
        {(items || [])
          .filter((item) => typeof item !== 'undefined')
          .map((item) => {
            const { fullPath: href, title, intro, childTocItems } = item
            const isActive = router.pathname === href
            return variant === 'compact' ? (
              <ActionList.Item key={href}>
                <div className="f4 d-list-item width-full list-style-none">
                  <Link className="d-block width-full text-underline" href={href}>
                    {title}
                  </Link>
                  {(childTocItems || []).length > 0 && (
                    <ul
                      className={cx(
                        variant === 'compact' ? 'list-style-circle pl-5 my-3' : 'list-style-none'
                      )}
                    >
                      {(childTocItems || []).map((childItem) => {
                        if (!childItem) {
                          return null
                        }
                        return (
                          <li key={childItem.fullPath} className="f4 d-block width-full m-2">
                            <Link
                              className="d-block width-full text-underline"
                              href={childItem.fullPath}
                            >
                              {childItem.title}
                            </Link>
                          </li>
                        )
                      })}
                    </ul>
                  )}
                </div>
              </ActionList.Item>
            ) : (
              <ActionList.Item key={href} className={cx('border-bottom')}>
                <div className={cx('mt-2', isActive && 'color-fg-muted')}>
                  <BumpLink as={Link} href={href} title={<h2 className="py-1 h4">{title}</h2>}>
                    {intro && (
                      <p
                        className="f4 color-fg-muted"
                        dangerouslySetInnerHTML={{ __html: intro }}
                      />
                    )}
                  </BumpLink>
                </div>
              </ActionList.Item>
            )
          })}
      </ActionList>
    </ul>
  )
}