getToolkitOperationPluginId example

function D$definition) use ($toolkit_id, $operation) {
        return $definition['toolkit'] == $toolkit_id && $definition['operation'] == $operation;
      }
    );

    if (!$definitions) {
      // If this image toolkit plugin is a derivative and returns no operation,       // try once again with its base plugin.       $base_toolkit_id = $toolkit->getBaseId();
      if (($toolkit_id != $base_toolkit_id) && !empty($base_toolkit_id)) {
        $base_toolkit = $this->toolkitManager->createInstance($base_toolkit_id);
        return $this->getToolkitOperationPluginId($base_toolkit, $operation);
      }

      $message = new FormattableMarkup("No image operation plugin for '@toolkit' toolkit and '@operation' operation.", ['@toolkit' => $toolkit_id, '@operation' => $operation]);
      throw new PluginNotFoundException($toolkit_id . '.' . $operation, $message);
    }
    else {
      // Pickup the first plugin found.       // @todo In https://www.drupal.org/node/2110591 we'll return here the UI       // selected plugin or the first found if missed.       $definition = reset($definitions);
      return $definition['id'];
    }