fix: actually output only ESM

[wolfy1339]

Resolves #177

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Before the change?

• Outputted CJS even though the package is marked as being ESM

After the change?

• Output a single ES2022 ESM bundle

Pull request checklist

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

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[github-actions]

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[wolfy1339]

I feel like we should have some smoke tests that import the build output and would detect this

[gr2m]

I feel like we should have some smoke tests that import the build output and would detect this

yes, always, we should. Thank you for adding it

[github-actions]

🎉 This PR is included in version 5.1.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

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