--- /dev/null
+/**
+ * @file
+ * Attaches behaviors for the Comment module's "by-viewer" class.
+ */
+
+(function ($, Drupal, drupalSettings) {
+ /**
+ * Add 'by-viewer' class to comments written by the current user.
+ *
+ * @type {Drupal~behavior}
+ */
+ Drupal.behaviors.commentByViewer = {
+ attach(context) {
+ const currentUserID = parseInt(drupalSettings.user.uid, 10);
+ $('[data-comment-user-id]')
+ .filter(function () {
+ return parseInt(this.getAttribute('data-comment-user-id'), 10) === currentUserID;
+ })
+ .addClass('by-viewer');
+ },
+ };
+}(jQuery, Drupal, drupalSettings));