apollo-compiler 1.31.1

query SelectionOfEnum {
  pet1 { name }
  pet2 { name }
  pet3 { name }
  pet4 { name }
  pet5 { name }
  pet6 { name }
}

type Query {
  pet1: Pet,
  pet2: Pet!,
  pet3: [Pet],
  pet4: [Pet!],
  pet5: [Pet]!,
  pet6: [Pet!]!,
}

enum Pet {
    CAT
    DOG
    FOX
}