graphql_compose-1.0.0-beta20/modules/graphql_compose_image_style/src/Plugin/GraphQL/SchemaExtension/ImageStyleSchemaExtension.php

<?php

declare(strict_types=1);

namespace Drupal\graphql_compose_image_style\Plugin\GraphQL\SchemaExtension;

use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\graphql\Attribute\SchemaExtension;
use Drupal\graphql\GraphQL\ResolverBuilder;
use Drupal\graphql\GraphQL\ResolverRegistryInterface;
use Drupal\graphql_compose\Plugin\GraphQL\SchemaExtension\ResolverOnlySchemaExtensionPluginBase;

/**
 * Add image styles to the Schema.
 */
#[SchemaExtension(
  id: "graphql_compose_image_style",
  name: new TranslatableMarkup("GraphQL Compose Image Style"),
  description: new TranslatableMarkup("Add image styles to the Schema."),
  schema: "graphql_compose",
  priority: 0,
)]
class ImageStyleSchemaExtension extends ResolverOnlySchemaExtensionPluginBase {

  /**
   * {@inheritdoc}
   */
  public function registerResolvers(ResolverRegistryInterface $registry): void {
    $builder = new ResolverBuilder();

    // Add style() query to Image types.
    $registry->addFieldResolver(
      'Image',
      'variations',
      $builder->compose(
        // Get the field->entity file from the parent.
        $builder->produce('property_path')
          ->map('value', $builder->fromContext('field_value'))
          ->map('path', $builder->fromValue('entity')),

        // Get the image derivatives.
        $builder->produce('image_derivatives')
          ->map('entity', $builder->fromParent())
          ->map('styles', $builder->produce('schema_enum_value')
            ->map('type', $builder->fromValue('ImageStyleAvailable'))
            ->map('value', $builder->fromArgument('styles')),
          )
      ),
    );
  }

}