schema
  @link(url: "https://specs.apollo.dev/link/v1.0")
  @link(url: "https://specs.apollo.dev/join/v0.3", for: EXECUTION) {
  query: Query
  mutation: Mutation
}

directive @join__enumValue(graph: join__Graph!) repeatable on ENUM_VALUE

directive @join__field(
  graph: join__Graph
  requires: join__FieldSet
  provides: join__FieldSet
  type: String
  external: Boolean
  override: String
  usedOverridden: Boolean
) repeatable on FIELD_DEFINITION | INPUT_FIELD_DEFINITION

directive @join__graph(name: String!, url: String!) on ENUM_VALUE

directive @join__implements(
  graph: join__Graph!
  interface: String!
) repeatable on OBJECT | INTERFACE

directive @join__type(
  graph: join__Graph!
  key: join__FieldSet
  extension: Boolean! = false
  resolvable: Boolean! = true
  isInterfaceObject: Boolean! = false
) repeatable on OBJECT | INTERFACE | UNION | ENUM | INPUT_OBJECT | SCALAR

directive @join__unionMember(
  graph: join__Graph!
  member: String!
) repeatable on UNION

directive @link(
  url: String
  as: String
  for: link__Purpose
  import: [link__Import]
) repeatable on SCHEMA

scalar join__FieldSet

enum join__Graph {
  SUBGRAPH_A @join__graph(name: "A", url: "http://service/A")
  SUBGRAPH_B @join__graph(name: "B", url: "http://service/B")
}

scalar link__Import

enum link__Purpose {
  """
  `SECURITY` features provide metadata necessary to securely resolve fields.
  """
  SECURITY

  """
  `EXECUTION` features provide metadata necessary for operation execution.
  """
  EXECUTION
}

type Error @join__type(graph: SUBGRAPH_A) @join__type(graph: SUBGRAPH_B) {
  message: String!
}

type User
  @join__type(graph: SUBGRAPH_A, key: "id")
  @join__type(graph: SUBGRAPH_B, key: "id") {
  id: ID! @join__field(graph: SUBGRAPH_A) @join__field(graph: SUBGRAPH_B)
  name: String! @join__field(graph: SUBGRAPH_A)
}

union Viewer
  @join__type(graph: SUBGRAPH_A)
  @join__unionMember(graph: SUBGRAPH_A, member: "User")
  @join__unionMember(graph: SUBGRAPH_A, member: "Error") =
  | User
  | Error

type Query @join__type(graph: SUBGRAPH_A) @join__type(graph: SUBGRAPH_B) {
  version: Version
  viewer: Viewer! @join__field(graph: SUBGRAPH_A)
}

type TestResult @join__type(graph: SUBGRAPH_B) {
  recordId: ID
  errors: [String!]!
  query: Query
}

type Mutation @join__type(graph: SUBGRAPH_A) @join__type(graph: SUBGRAPH_B) {
  test: TestResult @join__field(graph: SUBGRAPH_B)
}

type Version @join__type(graph: SUBGRAPH_A) @join__type(graph: SUBGRAPH_B) {
  a: String! @join__field(graph: SUBGRAPH_A)
  b: String! @join__field(graph: SUBGRAPH_B)
}
