public AjaxResponseAttachmentsProcessor::processAttachments(AttachmentsInterface $response)
Processes the attachments of a response that has attachments.
Libraries, JavaScript settings, feeds, HTML <head> tags, HTML <head> links, HTTP headers, and the HTTP status code are attached to render arrays using the #attached property. The #attached property is an associative array, where the keys are the attachment types and the values are the attached data. For example:
$build['#attached']