Since you are importing "node:fs" and "node:path" you are requiring node.js 14.18, 16.0, or later since your version 3.0.0. Also synckit in the version you use requires node 14. However, your engines field still includes "^12.20.0".

I can file a PR, if you want, but the issue is that this is already wrong for your existing published version 3.0.0 and newer, so you may want to consider re-publishing those as well, which is a little more involved than a simple PR.