tsx doesn't respect package.json exports field

### Acknowledgements - [x] I read the documentation and searched existing issues to avoid duplicates - [x] I understand this is a **bug tracker** and anything other than a proven bug will be closed - [x] I understand this is a free project and relies on community contributions - [x] I read and understood the [Contribution guide](https://github.com/privatenumber/tsx/blob/master/CONTRIBUTING.md) ### Minimal reproduction URL https://github.com/markabrahams/tsx-export-problem ### Problem & expected behavior (under 200 words) _No response_ ### Bugs are expected to be fixed by those affected by it - [ ] I'm interested in working on this issue ### Compensating engineering work will speed up resolution and support the project - [ ] I'm willing to offer $10 for financial support