Valid packages without `types` declaration in `package.json` seem to be ignored

[moltar]

Checklist

• [ ] I can reproduce this issue when running this plugin on its own.
• [x] I am running this plugin on .d.ts files generated by TypeScript.
• [x] This issue is not related to rolling up @types.

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I can reproduce this issue when running this plugin on its own.

I did not attempt this, as I believe tsup is not doing anything unusual with rollup-plugin-dts, and mostly just passing config options as-is. But if you want me to try it with raw rollup config, I can.

Please refer to this issue for all of the details and investigation: https://github.com/egoist/tsup/issues/1007

In summary:

A package.json that has no types property declared, will not result in bundling, even when the package is valid and is passing ATTW (Are the Types Wrong) test.

https://www.npmjs.com/package/@changesets/types?activeTab=code

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Code Snipped

Full repro with code: https://github.com/moltar/tsup-dts-resolve#readme

Error Message

No error message.

But the types are failing to bundle.