If we're not there already, it's just a matter of time before LLMs will be able to read and understand a framework they haven't seen before and be able to use it anyway.
LLMs are already trained on JavaScript at a deep level; as LLM reasoning and RAG techniques improve, there will be a time in the not-too-distant future when an LLM can be pointed to the website of a new framework and be able to use it.
There's actually a huge twist to this: JS people deprecate things so fast that most of the training data will be for a version that either warns about deprecations on every run, or has been fully removed from the API.
LLMs are already trained on JavaScript at a deep level; as LLM reasoning and RAG techniques improve, there will be a time in the not-too-distant future when an LLM can be pointed to the website of a new framework and be able to use it.