Angular15 - WARNING with TypeScript compilation

Question

I've updated my Angular Version from 14 to 15. Now when starting the application I'm getting this warnings. Not only one but 22 of those, for different files.

WARNING in /Users/.../src/environments/environment.prod.ts is part of the TypeScript compilation but it's unused. Add only entry points to the 'files' or 'include' properties in your tsconfig.

My current tsconfig.app.json is this:

{
  "extends": "../tsconfig.json",
  "compilerOptions": {
    "outDir": "../out-tsc/app",
    "baseUrl": "./",
    "types": []
  },
  "files": [
    "src/main.ts",
    "src/polyfills.ts"
  ],
  "include": [
    "src/**/*.d.ts"
  ],
  "angularCompilerOptions": {
    "enableResourceInlining": true,
    "generateCodeForLibraries": true,
    "compilationMode": "partial"
  },
  "angularOptions": {
    "annotationsAs": "decorators"
  }
}

I've tried all changes of files, include, exclude like described

here

and

here

But nothing helped. Most of the answers are regarding Angular 9 or 10. Maybe for Angular 15 its a different behavior.

Does anyone, using Angular 15 have seen this warnings and now the solution? I would be so thankful!