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Feature: restrict to given language spec version

See original GitHub issue

Similar to Acorn’s ecmaVersion option, the parser could restrict to a given language spec version (e.g., ES5) and have it throw an error if an unknown token is found (e.g., “Unexpected token let” if in ES5 mode).

This could probably be done externally using an onToken callback though.

Issue Analytics

State:
Created 3 years ago
Comments:10 (7 by maintainers)

Top GitHub Comments

1reaction

KFlashcommented, Aug 22, 2020

Most of this projects was made by my students, so Meriyah at least is safe to use and used by others. Seafox is just an experiment code I did to figure out what my students did wrong.

The EScaya project is my own code with no students involved, so you can follow me on EScaya. The differences with that parser is many, and it has error recovery, incremental parsing and you can use the AST you want through a parseCustom method. Still WIP.

As of now Meriyah is safe to use in production.

1reaction

coreybutlercommented, Aug 22, 2020

@KFlash - not sure where to ask this, but since the subject has creeped up in this thread, I’m going to ask. Is any one of these projects something you’d recommend using in production? Cherow, Meriyah, Buntis, Seafox, Escaya… it seems like things change pretty frequently. Your work is great and I love that it’s keeping up not just with the ES spec, but with alot of Stage 3 stuff. It’s just kind of hard to keep up with given all the different variations. Any guidance would be appreciated! I’m happy to open a new issue if that’s a better forum for this.