‘environment.dev.ts is part of the TypeScript compilation but it's unused. Add only entry points to the 'files' or 'include' properties in your tsconfig.’

### Full Warning

> WARNING in [...]/src/environments/environment.dev.ts is part of the TypeScript compilation but it's unused.
Add only entry points to the 'files' or 'include' properties in your tsconfig.

### Steps to Reproduce

- Run command `npm start`