• run npm install
• run npm run run:node
• run npm run run:tsx
• compare the result.

I noticed this when I was working with tsx and vite, we use tsx for development and node for production. First I was using named imports to import a commonjs package, vite errored and suggested to use default import:

CommonJS modules can always be imported via the default export, for example using:

import pkg from 'package';
const {default} = pkg;

So I did that, and it worked with node, but not with tsx. tsx supports named imports but not default import, and named imports don't work with this package on node. So this differences was an issue, because there's no overlaped way to import that would work in both.

I used debugger and I looked into what's happening, I managed to strip it down to this repo.