OBJECT
__Directive
A Directive provides a way to describe alternate runtime execution and type validation behavior in a GraphQL document.
In some cases, you need to provide options to alter GraphQL's execution behavior in ways field arguments will not suffice, such as conditionally including or skipping a field. Directives provide this by describing additional information to the executor.
link GraphQL Schema definition
1 type __Directive { 2 3 : String! 4 5 : String 6 7 : Boolean! 8 9 : [__DirectiveLocation!]! 10 11 (: Boolean): [__InputValue!]! 12 13 }