I could not even (as of yesterday) get some boilerplate code out of AI. It very confidently spitted code which would not even compile (multiple times). Yes, it is better than parsing StackoverFlow pages when I have some specific task or error and sometimes slightly better than reading a bunch of docs for a library, but even then I have to verify if it is giving code / examples from latest versions.
You can just tell it to read library code in npm_modules or wherever you have vendored libs in your framework. I for example give it whole demo examples and just say look at @demos/ how to do this. Cursor / CC authors don't add these prompts as this would be costly for them (and they run at loss likely now).