class ThemeHook

class ThemeHook {
    
    /**
     * Implements hook_theme().
     */
    public function theme() : array {
        $themeCommonElements = ThemeCommonElements::commonElements();
        $systemTheme = [
            // Normally theme suggestion templates are only picked up when they are in
            // themes. We explicitly define theme suggestions here so that the block
            // templates in core/modules/system/templates are picked up.
'block__system_branding_block' => [
                'render element' => 'elements',
                'base hook' => 'block',
            ],
            'block__system_messages_block' => [
                'base hook' => 'block',
            ],
            'block__system_menu_block' => [
                'render element' => 'elements',
                'base hook' => 'block',
            ],
            'system_themes_page' => [
                'variables' => [
                    'theme_groups' => [],
                    'theme_group_titles' => [],
                ],
                'file' => 'system.admin.inc',
            ],
            'system_config_form' => [
                'render element' => 'form',
            ],
            'confirm_form' => [
                'render element' => 'form',
            ],
            'system_modules_details' => [
                'render element' => 'form',
                'file' => 'system.admin.inc',
            ],
            'system_modules_uninstall' => [
                'render element' => 'form',
                'file' => 'system.admin.inc',
            ],
            'status_report_page' => [
                'variables' => [
                    'counters' => [],
                    'general_info' => [],
                    'requirements' => NULL,
                ],
            ],
            'status_report' => [
                'variables' => [
                    'grouped_requirements' => NULL,
                    'requirements' => NULL,
                ],
            ],
            'status_report_counter' => [
                'variables' => [
                    'amount' => NULL,
                    'text' => NULL,
                    'severity' => NULL,
                ],
            ],
            'status_report_general_info' => [
                'variables' => [
                    'drupal' => [],
                    'cron' => [],
                    'database_system' => [],
                    'database_system_version' => [],
                    'php' => [],
                    'php_memory_limit' => [],
                    'webserver' => [],
                ],
            ],
            'admin_page' => [
                'variables' => [
                    'blocks' => NULL,
                ],
                'file' => 'system.admin.inc',
            ],
            'admin_block' => [
                'variables' => [
                    'block' => NULL,
                    'attributes' => [],
                ],
                'file' => 'system.admin.inc',
            ],
            'admin_block_content' => [
                'variables' => [
                    'content' => NULL,
                ],
                'file' => 'system.admin.inc',
            ],
            'system_admin_index' => [
                'variables' => [
                    'menu_items' => NULL,
                ],
                'file' => 'system.admin.inc',
            ],
            'entity_add_list' => [
                'variables' => [
                    'bundles' => [],
                    'add_bundle_message' => NULL,
                ],
                'template' => 'entity-add-list',
            ],
            'system_security_advisories_fetch_error_message' => [
                'file' => 'system.theme.inc',
                'variables' => [
                    'error_message' => [],
                ],
            ],
            'entity_page_title' => [
                'variables' => [
                    'attributes' => [],
                    'title' => NULL,
                    'entity' => NULL,
                    'view_mode' => NULL,
                ],
            ],
        ];
        return array_merge($themeCommonElements, $systemTheme);
    }

}