directive @shareable repeatable on FIELD_DEFINITION | OBJECT

Shareable directive indicates that given object and/or field can be resolved by multiple subgraphs. If an object is marked as @shareable then all its fields are automatically shareable without the need for explicitly marking them with @shareable directive. All fields referenced from @key directive are automatically shareable as well.

Example:

type Product @key(fields: "id") {
  id: ID!                           # shareable because id is a key field
  name: String                      # non-shareable
  description: String @shareable    # shareable
}

type User @key(fields: "email") @shareable {
  email: String                    # shareable because User is marked shareable
  name: String                     # shareable because User is marked shareable
}