[api-extractor] Internal Error symbol has a ts.SyntaxKind.SourceFile declaration which is not (yet?) supported by API Extractor

[lukasIO]

Summary

When exporting a type within a namespace in a package, in a dependent package api-extractor runs fail with symbol has a ts.SyntaxKind.SourceFile declaration which is not (yet?) supported by API Extractor.

Repro steps

https://github.com/lukasIO/api-extractor-namespace-type-bug

The README has the repro steps.
What breaks api-extractor is seemingly utils.FooType here

Expected result:
api extractor runs without errors

Actual result:

ERROR: Internal Error: The ""./foo/utils/index"" symbol has a ts.SyntaxKind.SourceFile declaration which is not (yet?) supported by API Extractor

You have encountered a software defect. Please consider reporting the issue to the maintainers of this application.

Details

Standard questions

Please answer these questions to help us investigate your issue more quickly:

Question	Answer
@microsoft/api-extractor version?	7.47.9
Operating system?	Mac
API Extractor scenario?	reporting
Would you consider contributing a PR?	Yes
TypeScript compiler version?	5.4.2
Node.js version (node -v)?	20.9.0