Add: SEO Meta Fields WP-Graphql shema

SeoMeta.php

add_action( 'wp_loaded', 'wpse290170_wp_loaded' );

function wpse290170_wp_loaded() {
  $types = get_post_types( [
      'public'   => true
        ] );
      foreach ( $types as $type ){
        add_action( "graphql_" . $type . "_fields", function($fields) {

            $fields['seo_title'] = [
                    'type' => \WPGraphQL\Types::string(),
                    'description' => __('SEO Title'),
                    'resolve' => function(\WP_Post $post) {
                    return get_post_meta($post->ID, '_yoast_wpseo_title', true);
                    }
            ];

      $fields['seo_metadesc'] = [
                    'type' => \WPGraphQL\Types::string(),
                    'description' => __('SEO Dscription'),
                    'resolve' => function(\WP_Post $post) {
                    return get_post_meta($post->ID, '_yoast_wpseo_metadesc', true);
                    }
      ];

            $fields['seo_noindex'] = [
                    'type' => \WPGraphQL\Types::string(),
                    'description' => __('No Index'),
                    'resolve' => function(\WP_Post $post) {
                    return get_post_meta($post->ID, '_yoast_wpseo_meta-robots-noindex', true);
                    }
            ];

      $fields['seo_nofollow'] = [
                    'type' => \WPGraphQL\Types::boolean(),
                    'description' => __('The persons email address'),
                    'resolve' => function(\WP_Post $post) {
                    return get_post_meta($post->ID, '_yoast_wpseo_meta-robots-nofollow', true);
                    }
      ];

      $fields['opengraph_title'] = [
                    'type' => \WPGraphQL\Types::string(),
                    'description' => __('SEO Facebook Title'),
                    'resolve' => function(\WP_Post $post) {
                    return get_post_meta($post->ID, '_yoast_wpseo_opengraph-title', true);
                    }
      ];

      $fields['opengraph_description'] = [
                    'type' => \WPGraphQL\Types::string(),
                    'description' => __('Facebook Description'),
                    'resolve' => function(\WP_Post $post) {
                    return get_post_meta($post->ID, '_yoast_wpseo_opengraph-description', true);
                    }
      ];

      $fields['opengraph_image'] = [
                    'type' => \WPGraphQL\Types::string(),
                    'description' => __('Facebook Image'),
                    'resolve' => function(\WP_Post $post) {
                    return get_post_meta($post->ID, '_yoast_wpseo_opengraph-image', true);
                    }
            ];

            $fields['seo_twitter_title'] = [
                    'type' => \WPGraphQL\Types::string(),
                    'description' => __('Twitter Title'),
                    'resolve' => function(\WP_Post $post) {
                    return get_post_meta($post->ID, '_yoast_wpseo_twitter-title', true);
                    }
            ];
            $fields['seo_twitter_card'] = [
                    'type' => \WPGraphQL\Types::string(),
                    'description' => __('Twitter Description'),
                    'resolve' => function(\WP_Post $post) {
                    return get_post_meta($post->ID, '_yoast_wpseo_twitter-card', true);
                    }
            ];


            $fields['seo_twitter_description'] = [
                    'type' => \WPGraphQL\Types::string(),
                    'description' => __('Twitter Description'),
                    'resolve' => function(\WP_Post $post) {
                    return get_post_meta($post->ID, '_yoast_wpseo_twitter-description', true);
                    }
            ];

            $fields['seo_twitter_image'] = [
                    'type' => \WPGraphQL\Types::string(),
                    'description' => __('Twitter Image'),
                    'resolve' => function(\WP_Post $post) {
                    return get_post_meta($post->ID, '_yoast_wpseo_twitter-image', true);
                    }
            ];

      $fields['seo_canonical'] = [
                    'type' => \WPGraphQL\Types::string(),
                    'description' => __('SEO Canonical url'),
                    'resolve' => function(\WP_Post $post) {
                    return get_post_meta($post->ID, '_yoast_wpseo_canonical', true);
                    }
      ];

            $fields['seo_redirect'] = [
                    'type' => \WPGraphQL\Types::string(),
                    'description' => __('SEO Redirect'),
                    'resolve' => function(\WP_Post $post) {
                    return get_post_meta($post->ID, '_yoast_wpseo_redirect', true);
                    }
      ];


      $fields['gos_simple_redirect'] = [
                    'type' => \WPGraphQL\Types::string(),
                    'description' => __('SEO Redirect'),
                    'resolve' => function(\WP_Post $post) {
                    return get_post_meta($post->ID, 'gos_simple_redirect', true);
                    }
      ];

            return $fields;
    },99 );
  }
}