Correct me if I'm wrong, but we were blocked by node-fetch v3 because Jest doesn't work with ESM-only package, and with Vitest it should be fine now. Or is there more behind this?

Oh yeah, that's a good point. We could probably just upgrade it. I am just thinking to be able to use the native fetch in Node v18 is a good thing to have. It's not a big deal and I am fine with either way.

If we want to emulate node 18 native fetch, should we do import 'node-fetch-native/polyfill' instead in this PR? If we want to stick to importing from the module, I think upgrading node-fetch to v3 would suffice too.

If we are going to use the native fetch eventually, we can replace node-fetch with undici https://undici.nodejs.org/#/

Node.js fetch uses this library underlyingly nodejs/node#41749

Tried Udici, sadly the fetch API is not available in v14
https://github.com/vitejs/vite/runs/6468807477?check_suite_focus=true#step:9:48

https://undici.nodejs.org/#/?id=undicifetchinput-init-promise