Custom button on Content-Manager

I am trying to add a button to the Content Manager for Collection types. I have found some articles which help but i cant fathom what is the problem in my case. Im using TS and all the examples i saw are using JS. And what i cannot understand for some reason i have app.example.ts in my admin directory. Provided are some screenshots for better understanding. The ts error on the import at app.example.ts states: “Could not find a declaration file for module ‘./extensions/components/TestButton’.” Im new to this Admin Panel customization so any help will be appreciated! :slightly_smiling_face:

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