directive @composeDirective(name: String!) repeatable on SCHEMA

By default, Supergraph schema excludes all custom directives. The @composeDirective is used to specify custom directives that should be exposed in the Supergraph schema.

Example: Given @custom directive we can preserve it in the Supergraph schema

@GraphQLDirective(name = "custom", locations = [Introspection.DirectiveLocation.FIELD_DEFINITION])
annotation class CustomDirective

@ComposeDirective(name = "custom")
class CustomSchema

class SimpleQuery {
  @CustomDirective
  fun helloWorld(): String = "Hello World"
}

it will generate following schema

schema @composeDirective(name: "@myDirective") @link(import : ["@composeDirective", "@extends", "@external", "@inaccessible", "@interfaceObject", "@key", "@override", "@provides", "@requires", "@shareable", "@tag", "FieldSet"], url : "https://specs.apollo.dev/federation/v2.3") {
   query: Query
}

directive @custom on FIELD_DEFINITION

type Query {
  helloWorld: String! @custom
}