gistfile1.txt

data class User(
  val name: String
)

interface GetUserService {
  fun Id.fetchUser(): User
}

context(Context)
fun makeGetUserService(): GetUserService = object : GetUserService {
  override fun Id.fetchUser(): User =
    getSharedPreferences().extractUser(this.toString())
}

object GetUser {
  context(GetUserService)
  fun Id.getUser(): User =
    fetchUser()
}

object MainActivityViewModelPropagate {
  context(GetUserService)
  fun nextStep() {
    getUser("123")
  }
}

object MainActivityViewModelInjected {
  fun nextStep(f: (Id) -> User) {
    f("123")
  }
}

class MainActivity : AppCompatActivity() {

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    
    val service = makeGetUserService()

    with(service, MainActivityViewModelPropagate::nextStep)
    
    MainActivityViewModelInjected.nextStep {
      with(service, ::getUser)
    }
  }
}