How to test ts files that are not modules?

Question

typescript

There is a strict directory structure that contains ts files containing function declarations inside.
You need to test the code.
You can add the word export, import in tests, and before pushing, post-process and remove export from the es5-compiled version of the file. I found this package https://github.com/tonyhallett/typescript-remove-e... .
Are there more standard options, like using assemblers?