Block.php

<?php

namespace Drupal\Core\Block\Attribute;

use Drupal\Component\Plugin\Attribute\Plugin;
use Drupal\Core\StringTranslation\TranslatableMarkup;

/**
 * The Block attribute.
 */
class Block extends Plugin {
    
    /**
     * Constructs a Block attribute.
     *
     * @param string $id
     *   The plugin ID.
     * @param \Drupal\Core\StringTranslation\TranslatableMarkup|null $admin_label
     *   The administrative label of the block.
     * @param \Drupal\Core\StringTranslation\TranslatableMarkup|null $category
     *   (optional) The category in the admin UI where the block will be listed.
     * @param \Drupal\Core\Plugin\Context\ContextDefinitionInterface[] $context_definitions
     *   (optional) An array of context definitions describing the context used by
     *   the plugin. The array is keyed by context names.
     * @param class-string|null $deriver
     *   (optional) The deriver class.
     * @param string[] $forms
     *   (optional) An array of form class names keyed by a string.
     */
    public function __construct(string $id, ?TranslatableMarkup $admin_label = NULL, ?TranslatableMarkup $category = NULL, array $context_definitions = [], ?string $deriver = NULL, array $forms = []) {
    }

}