> A JS standard library would be a drop in the bucket compared to the size and complexity of the DOM libraries and implementing a usably performant JS engine.

It's still a nonzero amount of complexity. I see a lot of "v8 is really hard to compete with" comments on here so this feels very pertinent to mention. You can't have it both ways.

> Yes it should be done carefully. There are also plenty of examples of how this can be done well, done by experienced engineers. For example, the Dart starndard library (https://dart.dev/libraries - core [1], collection [2] and async [3] in particular) is a very good model that would fit JS fairly well too (with some tweaks and removals) > > [1]: https://api.dart.dev/stable/3.2.4/dart-core/dart-core-librar...

This one, at least, looks somewhat inspired by JavaScript.