The fact that most IDEs implement it doesn’t mean it’s trivial. I believe most IDEs leverage “language servers” written ~once per language and used by many IDEs

The fact that most IDEs implement it doesn’t mean it’s trivial. I believe most IDEs leverage “language servers” written ~once per language and used by many IDEs. It’s possible GitHub could also leverage those language servers (which would be super cool) but doing it at GitHub scale is certainly not trivial. Poor man’s version using the new GitHub search would be to construct a regex that matches one but not the other.