Very few packages published on npm include polyfills, especially packages you'd use when doing local scripting.

I'm sorry, but this is just incorrect. Have you ever heard of ljharb[0]? The NPM ecosystem is rife with polyfills[1]. I don't know how you can make a distinction on which libraries would be used for "local scripting" as I don't think many library authors make that distinction.

[0] - TC39 member who is self-described as "obsessed with backwards compatibility": https://github.com/ljharb

[1] - Here's one of many articles describing the situation: https://marvinh.dev/blog/speeding-up-javascript-ecosystem-pa...

Yes. I'm on TC39 as well, and I've talked to Jordan about this topic.

It's true that there are a few people who publish packages on npm including polyfills, Jordan among them. But these are a very small fraction of all packages on npm, and none of the compromised packages were polyfills. Also, he cares about backwards compatibility _with old versions of node_; the fact that JavaScript was originally a web language, as the grandparent comment says, is completely irrelevant to the inclusion of those specific polyfills.

Polyfills are just completely irrelevant to this discussion.

Fair enough. Thank you for the clarification, and I apologize for not recognizing your status as a TC39 member.