apollo-federation 2.13.1

schema {
  query: Query
}

extend schema
  @link(url: "https://specs.apollo.dev/link/v1.0")
  @link(url: "https://specs.apollo.dev/federation/v2.9")

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

directive @federation__key(
  fields: federation__FieldSet!
  resolvable: Boolean = true
) repeatable on OBJECT | INTERFACE

directive @federation__requires(
  fields: federation__FieldSet!
) on FIELD_DEFINITION

directive @federation__provides(
  fields: federation__FieldSet!
) on FIELD_DEFINITION

directive @federation__external(reason: String) on OBJECT | FIELD_DEFINITION

directive @federation__tag(
  name: String!
) repeatable on FIELD_DEFINITION | OBJECT | INTERFACE | UNION | ARGUMENT_DEFINITION | SCALAR | ENUM | ENUM_VALUE | INPUT_OBJECT | INPUT_FIELD_DEFINITION | SCHEMA

directive @federation__extends on OBJECT | INTERFACE

directive @federation__shareable on OBJECT | FIELD_DEFINITION

directive @federation__inaccessible on FIELD_DEFINITION | OBJECT | INTERFACE | UNION | ARGUMENT_DEFINITION | SCALAR | ENUM | ENUM_VALUE | INPUT_OBJECT | INPUT_FIELD_DEFINITION

directive @federation__override(
  from: String!
  label: String
) on FIELD_DEFINITION

directive @federation__composeDirective(name: String) repeatable on SCHEMA

directive @federation__interfaceObject on OBJECT

directive @federation__authenticated on FIELD_DEFINITION | OBJECT | INTERFACE | SCALAR | ENUM

directive @federation__requiresScopes(
  scopes: [[federation__Scope!]!]!
) on FIELD_DEFINITION | OBJECT | INTERFACE | SCALAR | ENUM

directive @federation__cost(
  weight: Int!
) on ARGUMENT_DEFINITION | ENUM | FIELD_DEFINITION | INPUT_FIELD_DEFINITION | OBJECT | SCALAR

directive @federation__listSize(
  assumedSize: Int
  slicingArguments: [String!]
  sizedFields: [String!]
  requireOneSlicingArgument: Boolean = true
) on FIELD_DEFINITION

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
}

scalar federation__FieldSet

scalar federation__Scope

scalar _Any

type _Service {
  sdl: String
}

type Query {
  _service: _Service!
  i: I
}

interface Node {
  id: ID!
}

interface I implements Node {
  id: ID!
  i: String
}

type A implements I & Node {
  id: ID!
  i: String
  a: String
}

type B implements I & Node {
  id: ID!
  i: String
  b: String
}