quartz-research-note/quartz/components/TableOfContents.tsx

import { QuartzComponentConstructor, QuartzComponentProps } from "./types"
import legacyStyle from "./styles/legacyToc.scss"
import modernStyle from "./styles/toc.scss"

// @ts-ignore
import script from "./scripts/toc.inline"

interface Options {
  layout: 'modern' | 'legacy'
}

const defaultOptions: Options = {
  layout: 'modern'
}

function TableOfContents({ fileData }: QuartzComponentProps) {
  if (!fileData.toc) {
    return null
  }

  return <div class="desktop-only">
    <button type="button" id="toc">
      <h3>Table of Contents</h3>
      <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" class="fold">
        <polyline points="6 9 12 15 18 9"></polyline>
      </svg>
    </button>
    <div id="toc-content">
      <ul>
        {fileData.toc.map(tocEntry => <li key={tocEntry.slug} class={`depth-${tocEntry.depth}`}>
          <a href={`#${tocEntry.slug}`} data-for={tocEntry.slug}>{tocEntry.text}</a>
        </li>)}
      </ul>
    </div>
  </div>
}
TableOfContents.css = modernStyle
TableOfContents.afterDOMLoaded = script

function LegacyTableOfContents({ fileData }: QuartzComponentProps) {
  if (!fileData.toc) {
    return null
  }

  return <details id="toc" open>
    <summary>
      <h3>Table of Contents</h3>
    </summary>
    <ul>
      {fileData.toc.map(tocEntry => <li key={tocEntry.slug} class={`depth-${tocEntry.depth}`}>
        <a href={`#${tocEntry.slug}`} data-for={tocEntry.slug}>{tocEntry.text}</a>
      </li>)}
    </ul>
  </details>
}
LegacyTableOfContents.css = legacyStyle

export default ((opts?: Partial<Options>) => {
  const layout = opts?.layout ?? defaultOptions.layout
  return layout === "modern" ? TableOfContents : LegacyTableOfContents
}) satisfies QuartzComponentConstructor