> Zas Editor reparses your code on every keystroke without compromising performance. Having a maintained AST at all times brings many intelligent features to the editor.

How does this work in the presence of syntax errors? 95% of the time you're writing code, your code is syntactically invalid, because you've started some new construct but not finished it yet, so you need syntax highlighting, code completion, etc to work sensibly in that situation. Getting that wrong is what killed RLS, IIRC.