Missing function names in getCallSites() with sourcemaps enabled

Acknowledgements

• I read the documentation and searched existing issues to avoid duplicates
• I understand this is a bug tracker and anything other than a proven bug will be closed
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Minimal reproduction URL

https://github.com/mbrevda/tsx-callsite/actions/runs/12773816667/job/35606578729

Problem & expected behavior (under 200 words)

When using the getCallSites() util, some function names are missing when the sourceMap option is true.

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