Expected Behaviour

successful compilation.

Actual Behaviour

Error: Debug Failure. False expression.
at Object.getOutputDeclarationFileName

Steps to Reproduce the Problem

just clone the repository and run:

yarn install 
yarn build

Location of a Minimal Repository that Demonstrates the Issue.

https://github.com/gvinaccia/ts-loader-issue