The stylex package already has both ESM and CJS exports. The build script generates both variants of the package and the package.json has been configured to support both kinds of module systems. There is likely an issue with your Nx configuration as Rollup likes to import ESM when possible.

That is the only package that needs to be bundled as every other package is a plugin for Babel, ESLint or some bundler.

@nmn Thanks for the reply. I probably expressed myself incorrenctly.

What you are saying is true. The stylex package indeed supports both esm and cjs.

But in my original post I mention (all of the packages). Meaning all of the monorepo packages such as plugins. For example the rollup-plugin does not support cjs. And that's the issue I'm trying to raise here.

My understanding was that Rollup was all-in on ESM, so only exporting an ESM build was intentional. This is also the case for the Babel and ESlint plugins which need to be CJS to work.

We can probably add CJS support the rollup plugin without too much trouble.

That would be brilliant. I don’t think the support for cjs should bring any hassle in the long run. Although we may hopefully see a future with single united module philosophy. 🙂

Hey @nmn, is the support planned on any roadmap? Can I help with this anyhow? Thanks! 🙏

@VojGin Happy to accept a PR as I haven't had the time to prioritize this yet. The @stylexjs/stylex package is a good example to use.