Comment parsing and porting to other languages

[mcmikecreations]

Hi! My team is making a scripting frontend for our database at TUM and we were looking for different language parsers. The codebase is in C++, but I skimmed through meriyah and it should be feasible to rewrite in C++. The question is, we require single- and multi-line comments for type annotations and metadata. Is there a simple way to achieve it in this parser, at least JSDoc-style comments?

[3cp]

It will be difficult.
The comments in meriyah are not parsed as normal flow of tokens (ESTree spec didn't define comment as a node). There is onComment option (or callback) but it's difficult to know surrounding JS tokens of that comment. There is also some known bugs for onComment.

Speaking about C++ JS parsers, the Chrome V8 and Safari JavaScriptCore are all native C++ parsers, and they are in much better quality than meriyah. You may have a better chance there.

[aralroca]

Is it possible to add comments to the Meriyah AST? I am interested to put the @__PURE__ in some function calls