GraphQL input union proposal

input-interface.graphql

interface AddMediaBlock = {
  inputTypeName: AddMediaBlockInputTypeNameEnum!
}

enum AddMediaBlockInputTypeNameEnum {
  AddPostInput
  AddImageInput
}

input AddPostInput implements AddMediaBlockInterface {
  kind: AddMediaBlockInputEnum!
  title: String!
  body: String!
}

input AddImageInput implements AddMediaBlockInterface  {
  kind: AddMediaBlockInputEnum!
  photo: String!
  caption: String
}

interface EditMediaBlock = {
  inputTypeName: EditMediaBlockInputTypeNameEnum!
}

enum EditMediaBlockInputTypeNameEnum {
  EditPostInput
  EditImageInput
}

input EditPostInput implements EditMediaBlock {
  inputTypeName: EditMediaBlockInputTypeNameEnum!
  title: String
  body: String
}

input EditImageInput implements EditMediaBlock {
  inputTypeName: EditMediaBlockInputTypeNameEnum!
  photo: String
  caption: String
}

type Mutation {
   addContent(content: [AddMediaBlock]!): Post   
   editContent(content: EditMediaBlock!): Post   
}

inputunion-with-interfaces.graphql

enum AddMediaBlockInputEnum {
  AddPostInput
  AddImageInput
}

enum EditMediaBlockInputEnum {
  EditPostInput
  EditImageInput
}

interface AddMediaBlockInterface {
  kind: AddMediaBlockInputEnum!
}

interface AddMediaBlockInterface {
  kind: AddMediaBlockInputEnum!
}

input AddPostInput implements AddMediaBlockInterface {
  kind: AddMediaBlockInputEnum!
  title: String!
  body: String!
}

input AddImageInput implements AddMediaBlockInterface  {
  kind: AddMediaBlockInputEnum!
  photo: String!
  caption: String
}

inputunion AddMediaBlockInput = AddPostInput | AddImageInput;

input EditPostInput {
  kind: EditMediaBlockInputEnum!
  title: String
  body: String
}

input EditImageInput {
  kind: EditMediaBlockInputEnum!
  photo: String
  caption: String
}

inputunion EditMediaBlockInput = EditPostInput | EditImageInput;

type Mutation {
   addContent(content: [AddMediaBlock]!): Post   
   editContent(content: EditMediaBlock!): Post   
}

inputunion.graphql

enum AddMediaBlockInputEnum {
  AddPostInput
  AddImageInput
}

enum EditMediaBlockInputEnum {
  EditPostInput
  EditImageInput
}

input AddPostInput {
  kind: AddMediaBlockInputEnum!
  title: String!
  body: String!
}

input AddImageInput {
  kind: AddMediaBlockInputEnum!
  photo: String!
  caption: String
}

inputunion AddMediaBlockInput = AddPostInput | AddImageInput;

input EditPostInput {
  kind: EditMediaBlockInputEnum!
  title: String
  body: String
}

input EditImageInput {
  kind: EditMediaBlockInputEnum!
  photo: String
  caption: String
}

inputunion EditMediaBlockInput = EditPostInput | EditImageInput;

type Mutation {
   addContent(content: [AddMediaBlock]!): Post   
   editContent(content: EditMediaBlock!): Post   
}