[package] expose as a commonjs module?

[severo]

https://arethetypeswrong.github.io/?p=hyparquet%401.5.0 reports an issue:

ESM (dynamic import only)

A require call resolved to an ESM JavaScript file, which is an error in Node and some bundlers. CommonJS consumers will need to use a dynamic import.

Two options:

• add a build step to publish a cjs version of the package
• assume it's ESM-only (as mentioned in https://github.com/arethetypeswrong/arethetypeswrong.github.io/blob/main/docs/problems/CJSResolvesToESM.md#common-causes), and claim it a bit more prominently in the README (here, for example: https://github.com/hyparam/hyparquet?tab=readme-ov-file#nodejs <- we show a dynamic import, we could add a sentence to say it's ESM-only and cannot be imported with require)

[severo]

We could also add https://github.com/marketplace/actions/are-the-types-wrong-checker as a github action, here and in the other repos, to check the package

[severo]

Note also https://github.com/isaacs/tshy, which aims to help package publishers get the package.json right when the code is typescript. It's used now by Hugging Face at huggingface/huggingface.js#1029

[platypii]

README is updated to emphasize that it is ESM only. I think that is sufficient, the future is ESM. If someone really needs commonjs they can transpile it or use a transpiling CDN.