setConfigDependencies example

// Add a dependency on the provider of the library.     if ($library = $definition->getLibrary()) {
      $config_dependencies = $definition->getConfigDependencies();
      [$library_provider] = explode('/', $library, 2);
      if ($this->moduleHandler->moduleExists($library_provider)) {
        $config_dependencies['module'][] = $library_provider;
      }
      elseif ($this->themeHandler->themeExists($library_provider)) {
        $config_dependencies['theme'][] = $library_provider;
      }
      $definition->setConfigDependencies($config_dependencies);
    }

    // If 'template' is set, then we'll derive 'template_path' and 'theme_hook'.     $template = $definition->getTemplate();
    if (!empty($template)) {
      $template_parts = explode('/', $template);

      $template = array_pop($template_parts);
      $template_path = $path;
      if (count($template_parts) > 0) {
        $template_path .= '/' . implode('/', $template_parts);
      }