How to get rid of the warning .ts file is part of the TypeScript compilation but it's unused

Question

I Just updated angular to latest 9.0.0-next.4. I am not using routing but suddenly after updating I keep seeing this warning. How Do I remove this warning

Answer 1

I could get it working by defining the files property in tsconfig.app.json. These files are relative to the tsconfig.app.json file.

"files": [
    "main.ts",
    "polyfills.ts"
  ]