GQLServiceDefinition

A service definition.

Service capabilities is an experimental feature. Because GQLServiceExtension implements a sealed interface, you might have to handle the when case even though you did not opt into the feature. If that is the case, and if you do not want to support the experimental feature, you can safely ignore the case:

@OptIn(ApolloExperimental::class)
when (definition) {
  // ...
  is GQLServiceDefinition -> error("Service capabilities is an experimental feature and is currently not supported. See https://github.com/graphql/graphql-spec/pull/1208 for more details.")
}