How Docusaurus find anchors?

[jcubic]

Got this errror:

[WARNING] Docusaurus found broken anchors!

Please check the pages of your site in the list below, and make sure you don't reference any anchor that does not exist.
Note: it's possible to ignore broken anchors with the 'onBrokenAnchors' Docusaurus configuration, and let the build pass.

Exhaustive list of all broken anchors found:
- Broken anchor on source page path = /docs/lips/REPL:
   -> linking to /#bookmark
- Broken anchor on source page path = /docs/scheme-intro/what-is-lisp:
   -> linking to /#bookmark

I have this code:

  return (
    <section id="bookmark">

That appear on front page.

The website:

https://lips.js.org/#bookmark

[jcubic]

Found that I need to run:

import useBrokenLinks from '@docusaurus/useBrokenLinks';
useBrokenLinks().collectAnchor('bookmark');