class CKEditor5::Rails::Presets::PluginsBuilder

def prepend(*names, before: nil, **kwargs)
  new_plugins = names.map { |name| self.class.create_plugin(name, **kwargs) }
  if before
    index = items.index { |p| p.name == before }
    raise ArgumentError, "Plugin '#{before}' not found" unless index
    items.insert(index, *new_plugins)
  else
    items.insert(0, *new_plugins)
  end
end