[api-extractor] SyntaxKind.SourceFile not supported by API Extractor

[perezgarciam]

Summary

Running into following the error when running api-extractor

ERROR: Internal Error: The ""../api-extractor-repro/lib/abc"" 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.

Repro steps

Here's a minimal repro https://github.com/perezgarciam/api-extractor-repro

gh repo clone perezgarciam/api-extractor-repro
cd api-extractor-repro
npm install
npm start

Details

Seems that importing the type throws the error as updating the code to the snippet below fixes the problem

const abcImport = import('./abc');

/**
 * Asynchronously loads function that returns a number
 */
export const fnAsync: Promise<typeof import('./abc').fn> = abcImport.then((module) => module.fn);

Standard questions

Question	Answer
@microsoft/api-extractor version?	7.57.3
Operating system?	Mac
API Extractor scenario?	Reporting
Would you consider contributing a PR?	With guidance
TypeScript compiler version?	5.9.3
Node.js version (node -v)?	v24.12.0