It should not be put on both, or it will create dependency resolution issues where if two packages depend on it from different registries, bundlers can't remove the duplicate. As much as I love JSR.
How do I publish to JSR? I'm using https://github.com/changesets/changesets to manage changelogs and publish versions
Discussion
Good to know, thanks. Would it be enough to have it in a namespace on one of the two?