pub trait FieldDefinition: HasDirectives {
type ArgumentsDefinition: ArgumentsDefinition;
type OutputType: OutputType;
// Required methods
fn description(&self) -> Option<&str>;
fn name(&self) -> &str;
fn arguments_definition(&self) -> Option<&Self::ArgumentsDefinition>;
fn type(&self) -> &Self::OutputType;
fn is_builtin(&self) -> bool;
}