Codegen won't show Warning or Error for conflicting Fragments

[Jeday]

For example, you have RestaurantSchema.ts:

const RestaurantCityFragment = gql`
fragment CityFragment on City {
    id
    name
    region
  }
`
export const FetchRestaurants = gql`
  query FetchRestaurants {
   Restaurants {
     id
     city{
     ...CityFragment
     }  
    }
  }
  ${CityFragment}
`

and CitySchema.ts:

const CityFragment = gql`
  fragment CityFragment on City {
    id
    name
    slug
  }
`
export const FetchCities = gql`
  query FetchCities {
   Cities {
      ...CityFragment
    }
  }
  ${CityFragment}
`

What one would expect is a warning or a error about naming conflicts in schema that will lead to unpredictable behavior.

But codegen finishes with success and no indication of an error .

Commands run:

apollo client:codegen --target=typescript --outputFlat src/types/api.d.ts 

Version:
apollo: 2.21.0