src/Executor/Values.php
public static function getDirectiveValues(Directive $directiveDef, $node, $variableValues = null)
    {
        if (isset($node->directives) && $node->directives instanceof NodeList) {
            $directiveNode = Utils::find(
                $node->directives,
                static function (DirectiveNode $directive) use ($directiveDef) {
                    return $directive->name->value === $directiveDef->name;
                }
            );

            if ($directiveNode !== null) {
                return self::getArgumentValues($directiveDef, $directiveNode, $variableValues);
            }
        }

        return null;
    }
public static function getDirectiveValues(Directive $directiveDef, $node, $variableValues = null)
    {
        if (isset($node->directives) && $node->directives instanceof NodeList) {
            $directiveNode = Utils::find(
                $node->directives,
                static function (DirectiveNode $directive) use ($directiveDef) {
                    return $directive->name->value === $directiveDef->name;
                }
            );

            if ($directiveNode !== null) {
                return self::getArgumentValues($directiveDef, $directiveNode, $variableValues);
            }
        }

        return null;
    }
Prepares an object map of argument values given a directive definition
and a AST node which may contain directives. Optionally also accepts a map
of variable values.

If the directive does not exist on the node, returns undefined.

@param FragmentSpreadNode|FieldNode|InlineFragmentNode|EnumValueDefinitionNode|FieldDefinitionNode $node
@param mixed[]|null                                                                                $variableValues

@return mixed[]|null