React-app can't be build due to component library

[Pietsen]

Hi, i'm currently working on implementing a stencil library with react/angular ouputs like this demo does.

But now i got the same error in this repo like in my project (i thought i did something wrong there).

Maybe you can tell me what im doing wrong.

I checked out this demo, installed all packages in required packages and build the component-library with npm run build and then i build the react-app and i got this error:

Any idea?