I didn't say generate :) - in all seriousness, I think you could reasonably have it copy the code for e.g. lodash.merge() and paste it into your codebase without the headaches you're describing. IMO, this method would be practical for a majority of npm deps in prod code. There are some I'd want to rely on the lib (and its maintenance over time), but also... a sort function is a sort function.
In 2022, sure. But not today. Even something as simple as generating and running a `git clone && cp xyz` command will create code not directly generated by the LLM.