directive @extends on OBJECT | INTERFACE

Extends directive is used to represent type extensions in the schema. Native type extensions are currently unsupported by the graphql-kotlin libraries. Federated extended types should have corresponding @key directive defined that specifies primary key required to fetch the underlying object.

Example: Given

@KeyDirective(FieldSet("id"))
@ExtendsDirective
class Product(@ExternalDirective val id: String) {
  fun newFunctionality(): String = "whatever"
}

should generate

type Product @extends @key(fields : "id") {
  id: String! @external
  newFunctionality: String!
}