diff --git a/core/modules/outside_in/js/offcanvas.js b/core/modules/outside_in/js/offcanvas.js
index 8c73b2c..849e3df 100644
--- a/core/modules/outside_in/js/offcanvas.js
+++ b/core/modules/outside_in/js/offcanvas.js
@@ -7,11 +7,12 @@
 
   'use strict';
 
+  var edge = (document.documentElement.dir === 'rtl') ? 'left' : 'right';
+
   function resetSize(event) {
     var offsets = displace.offsets;
     var $element = event.data.$element;
     var $widget = $element.dialog('widget');
-    var edge = getEdge();
 
     var adjustedOptions = {
       position: {
@@ -49,18 +50,8 @@
     $element.height(modalHeight - offset - scrollOffset);
   }
 
-  /**
-   * Determine on which screen edge the tray should appear.
-   *
-   * @returns {string}
-   *   'left' or 'right'
-   */
-  function getEdge() {
-    return (document.documentElement.dir === 'rtl') ? 'left' : 'right';
-  }
 
   function bodyPadding(event) {
-    var edge = getEdge();
     var $element = event.data.$element;
     var $widget = $element.dialog('widget');
     var $body = $('body');
@@ -85,7 +76,7 @@
           .on('dialogContentResize.outsidein', eventData, handleDialogResize)
           .trigger('dialogresize.outsidein');
 
-        $element.dialog('widget').attr('data-offset-' + getEdge(), '');
+        $element.dialog('widget').attr('data-offset-' + edge, '');
 
         $(window)
           .on('resize.outsidein scroll.outsidein', eventData, debounce(resetSize, 100))
@@ -96,7 +87,6 @@
     },
     'dialog:beforecreate': function (event, dialog, $element, settings) {
       if ($element.is('#drupal-offcanvas')) {
-        var edge = getEdge();
         settings.position = {
           my: 'left top',
           at: edge + ' top',
@@ -108,7 +98,7 @@
     'dialog:beforeclose': function (event, dialog, $element) {
       $(document).off('.outsidein');
       $(window).off('.outsidein');
-      $('body').css('padding-' + getEdge(), 0);
+      $('body').css('padding-' + edge, 0);
     }
   });
 
diff --git a/core/modules/outside_in/outside_in.libraries.yml b/core/modules/outside_in/outside_in.libraries.yml
index 8787d77..0b704af 100644
--- a/core/modules/outside_in/outside_in.libraries.yml
+++ b/core/modules/outside_in/outside_in.libraries.yml
@@ -10,6 +10,7 @@ drupal.outside_in:
   dependencies:
     - core/jquery
     - core/drupal
+    - core/drupal.ajax
 drupal.off_canvas:
   version: VERSION
   js:
diff --git a/core/modules/outside_in/tests/modules/offcanvas_test/src/Controller/TestController.php b/core/modules/outside_in/tests/modules/offcanvas_test/src/Controller/TestController.php
index 8a2f115..269158a 100644
--- a/core/modules/outside_in/tests/modules/offcanvas_test/src/Controller/TestController.php
+++ b/core/modules/outside_in/tests/modules/offcanvas_test/src/Controller/TestController.php
@@ -54,7 +54,7 @@ public function linksDisplay() {
         ],
         '#attached' => [
           'library' => [
-            'outside_in/drupal.off_canvas',
+            'outside_in/drupal.outside_in',
           ],
         ],
       ],
@@ -69,7 +69,7 @@ public function linksDisplay() {
         ],
         '#attached' => [
           'library' => [
-            'outside_in/drupal.off_canvas',
+            'outside_in/drupal.outside_in',
           ],
         ],
       ],