only in patch2:
unchanged:
--- /dev/null
+++ b/js/claro.ajax.js
@@ -0,0 +1,23 @@
+/**
+* DO NOT EDIT THIS FILE.
+* See the following change record for more information,
+* https://www.drupal.org/node/2815083
+* @preserve
+**/
+
+(function (Drupal) {
+  Drupal.theme.ajaxProgressIndicatorFullscreen = function () {
+    return '<div class="ajax-progress ajax-progress--fullscreen"><div class="ajax-progress__throbber">&nbsp;</div></div>';
+  };
+
+  Drupal.theme.ajaxProgressThrobber = function (message) {
+    var messageMarkup = typeof message === 'string' ? Drupal.theme('ajaxProgressMessage', message) : '';
+    var throbber = '<div class="ajax-progress__throbber">&nbsp;</div>';
+
+    return '<div class="ajax-progress ajax-progress--throbber">' + throbber + messageMarkup + '</div>';
+  };
+
+  Drupal.theme.ajaxProgressMessage = function (message) {
+    return '<div class="ajax-progress__message">' + message + '</div>';
+  };
+})(Drupal);
\ No newline at end of file