Angular10 DevOps Extension RestApi

I found this very helpful github project which is a proof of concept to make angular work in an extension of Azure DevOps. Everything works fine until i want to use the build in rest api's like "VSS/Service" or "TFS/VersionControl/GitRestClient". I found out that when i add to the includes from the tsconfig.app.json my visual studio codium ide recognizes the types in my component with import { VssService } from 'VSS/Service'; but when i try to build the file with ng build the following error comes up:

Module not found: Error: Can't resolve 'VSS/Service'

I tried to add to angular.json scripts[] the VSS.SDK.min.js file which didn't change anything.

I see that over the init-vss-angular.js VSS gets initialized but i have no idea how to get the rest service to use in my angular app

regads

from Angular10 DevOps Extension RestApi