It's wild that that's not what the section is about. Extending error is not new at-all.
Most people (including the author apparently) don't know they can chain errors with cause option in-built way in node and in browser. It is not just arbitrary extending and it is relatively a new thing. https://nodejs.org/api/errors.html#errorcause
Most people (including the author apparently) don't know they can chain errors with cause option in-built way in node and in browser. It is not just arbitrary extending and it is relatively a new thing. https://nodejs.org/api/errors.html#errorcause