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
- type __Directive {
 - : String! 
 - : String 
 - : [__DirectiveLocation!]! 
 - : [__InputValue!]! 
 - #   Permits using the directive multiple times at the same location.
 - : Boolean! 
 - }