https://www.tutorialpedia.org/blog/how-to-auto-reload-files-in-node-js-while-using-esm

The gist of this is that you add a suffix to the URL to do cache busting. For test code I'm okay with that.

I think the circular import logjam may have to be broken in a non-backward-compatible manner. Unless I can find a clever way to feed a context into an import statement.