Add SWC support for istanbul

[eden-chan]

Describe the feature

Add SWC support for istanbul

Babel plugin or link to the feature description

https://www.npmjs.com/package/babel-plugin-istanbul

Additional context

I am using SWC, but need to use istanbul for my Cypress Code Coverage plugin. Since it is not supported by SWC, I am opting out of SWC for Babel. Some other devs also opted out too. Not sure what the progress is on this.

vercel/next.js#30529
vercel/next.js#30174

[kwonoj]

What exactly swc needs to support other than istanbul's comment directive (#3854 (comment))?

Oh I missed plugin part. Someone needs to write plugin if it need to be supported.

[kwonoj]

Let's see if it's possible to port into plugin. This requires to port some of istanbul itself (lib-instrument for example)

[kwonoj]

This is now available via vercel/next.js#36692 and https://github.com/kwonoj/swc-coverage-instrument, though I expect there'll be some rough edges need to fix forward. It is unclear if we'll move this codes into swc upstream's plugin repo or not at this moment.

Given this'll probably not be included in @swc/core, I'll close this issue as sort of complete. Feedbacks, or issues can be reported in next.js directly instead.

[swc-bot]

This closed issue has been automatically locked because it had no new activity for a month. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.