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! 8 4 : String 8 5 : Boolean! 8 6 : [__DirectiveLocation!]! 8 7 : [__InputValue!]! 9 10 }