react-scripts-ts results in corrupted build

I am working on this legacy application. It is using react-scripts-ts for running it. So the scripts section of package.json looks like this:

  "scripts": {
    "start": "react-scripts-ts start",
    "build": "react-scripts-ts build"
  },

I was cleaning some dependencies as they caused us an issue, but I am unable to get the application to work now.

If I do npm start all is good and works well.

If I do npm run buil all compiles ok no errors. However, if I try to use the application from the built artifacts I get:

Uncaught (in promise) TypeError: Super expression must either be null or a function
    at 6.fb2d1b96.chunk.js:1:99050
    at 6.fb2d1b96.chunk.js:1:99118
    at Object.e.exports (6.fb2d1b96.chunk.js:1:100445)
    ...

Would you have any pointers or tips on how to debug this?