Draft: Resolve #3462514 "Support for link"

Closes #3462514

modules/graphql_compose_linkattributes/src/Plugin/GraphQLCompose/SchemaType/LinkAttributes.php

+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\graphql_compose_linkattributes\Plugin\GraphQLCompose\SchemaType;
+
+use Drupal\graphql_compose\Plugin\GraphQLCompose\GraphQLComposeSchemaTypeBase;
+use GraphQL\Type\Definition\ObjectType;
+use GraphQL\Type\Definition\Type;
+
+/**
+ * {@inheritdoc}
+ *
+ * @GraphQLComposeSchemaType(
+ *   id = "LinkAttributes",
+ * )
+ */
+class LinkAttributes extends GraphQLComposeSchemaTypeBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getTypes(): array {
+    $types = [];
+
+    $types[] = new ObjectType([
+      'name' => $this->getPluginId(),
+      'description' => (string) $this->t('Link item attributes set within the CMS.'),
+      'fields' => function () {
+        $fields['id'] = [
+          'type' => Type::string(),
+          'description' => 'The ID of the link.',
+        ];
+        $fields['name'] = [
+          'type' => Type::string(),
+          'description' => 'The name of the link.',
+        ];
+        $fields['title'] = [
+          'type' => Type::string(),
+          'description' => 'The title of the link.',
+        ];
+        $fields['target'] = [
+          'type' => Type::string(),
+          'description' => 'The target of the link.',
+        ];
+        $fields['rel'] = [
+          'type' => Type::string(),
+          'description' => 'The rel of the link.',
+        ];
+        $fields['class'] = [
+          'type' => Type::listOf(Type::string()),
+          'description' => 'The classes of the link.',
+        ];
+        $fields['accessKey'] = [
+          'type' => Type::string(),
+          'description' => 'The accesskey of the link.',
+        ];
+        $fields['ariaLabel'] = [
+          'type' => Type::string(),
+          'description' => 'The aria_label of the link.',
+        ];
+        return $fields;
+      },
+    ]);
+
+    return $types;
+  }
+
+}