What is the status of "shallow renderer"?

Google leads me to this page: https://reactjs.org/docs/shallow-renderer.html
However, I can not find it anywhere in the table of contents on the right.
Note that the versioning on the page suggests that this is a feature of React 18

I see that react-test-renderer does export react-test-renderer/shallow ( https://github.com/facebook/react/blob/main/packages/react-test-renderer/shallow.js ), but it isn't documented (https://reactjs.org/docs/test-renderer.html). I also see that shallow-renderer ( https://www.npmjs.com/package/react-shallow-renderer ) is versioned 16, and was last updated 2 years ago, suggesting to me that it is not up to date with React 18.

It would be nice if some clarification of the state of this feature was added to the page. (I'd be happy to volunteer to make such a PR, but I have no way of knowing what the definitive answer is :-) )

Start with the linked shallow-renderer documentation page and the react-test-renderer/shallow.js entry point, then compare them with the linked test-renderer documentation. Determine the feature's React 18 status and whether the separate react-shallow-renderer package is current. Done means the documentation clearly states its status and appears appropriately in navigation.