diff --git c/core/lib/Drupal/Core/Archiver/ArchiveTar.php i/core/lib/Drupal/Core/Archiver/ArchiveTar.php
index 4ddf6b2..ac54bde 100644
--- c/core/lib/Drupal/Core/Archiver/ArchiveTar.php
+++ i/core/lib/Drupal/Core/Archiver/ArchiveTar.php
@@ -64,7 +64,7 @@ class ArchiveTar // extends PEAR
     var $_tarname='';
 
     /**
-    * @var bool if true, the Tar file will be gzipped
+    * @var boolean if true, the Tar file will be gzipped
     */
     var $_compress=false;
 
diff --git c/core/modules/ckeditor/js/ckeditor.admin.js i/core/modules/ckeditor/js/ckeditor.admin.js
index 4041514..ff75541 100644
--- c/core/modules/ckeditor/js/ckeditor.admin.js
+++ i/core/modules/ckeditor/js/ckeditor.admin.js
@@ -160,7 +160,7 @@
        * @param DOM form
        *   The form DOM element that contains the input with the new button group
        *   title string.
-       * @return bool
+       * @return Boolean
        *   Returns true when an error exists, otherwise returns false.
        */
       function validateForm(form) {
diff --git c/core/modules/ckeditor/js/views/AuralView.js i/core/modules/ckeditor/js/views/AuralView.js
index 5568847..5acd776 100644
--- c/core/modules/ckeditor/js/views/AuralView.js
+++ i/core/modules/ckeditor/js/views/AuralView.js
@@ -33,7 +33,7 @@
      * Calls announce on buttons and groups when their position is changed.
      *
      * @param Drupal.ckeditor.ConfigurationModel model
-     * @param bool isDirty
+     * @param Boolean isDirty
      *   A model attribute that indicates if the changed toolbar configuration
      *   has been stored or not.
      */
diff --git c/core/modules/ckeditor/js/views/ControllerView.js i/core/modules/ckeditor/js/views/ControllerView.js
index 07c0c9f..aff0f8d 100644
--- c/core/modules/ckeditor/js/views/ControllerView.js
+++ i/core/modules/ckeditor/js/views/ControllerView.js
@@ -30,7 +30,7 @@
      *
      * @param Drupal.ckeditor.ConfigurationModel model
      *   The state model for the CKEditor configuration.
-     * @param bool isDirty
+     * @param Boolean isDirty
      *   Tracks whether the active toolbar DOM structure has been changed.
      *   isDirty is toggled back to false in this method.
      * @param Object options
diff --git c/core/modules/ckeditor/js/views/VisualView.js i/core/modules/ckeditor/js/views/VisualView.js
index 787bf3e..95d56e7 100644
--- c/core/modules/ckeditor/js/views/VisualView.js
+++ i/core/modules/ckeditor/js/views/VisualView.js
@@ -85,7 +85,7 @@
       /**
        * Inserts a new button if the openGroupNameDialog function returns true.
        *
-       * @param bool success
+       * @param Boolean success
        *   A flag that indicates if the user created a new group (true) or
        *   canceled out of the dialog (false).
        * @param jQuery $group
diff --git c/core/modules/editor/js/editor.admin.js i/core/modules/editor/js/editor.admin.js
index e4ed74a..cbd1510 100644
--- c/core/modules/editor/js/editor.admin.js
+++ i/core/modules/editor/js/editor.admin.js
@@ -73,7 +73,7 @@
      *
      * @param Drupal.EditorFeature feature
      *   A text editor feature object.
-     * @return bool
+     * @return Boolean
      *   Whether the given feature is allowed by the current filters.
      */
     featureIsAllowedByFilters: function (feature) {
diff --git c/core/modules/history/js/history.js i/core/modules/history/js/history.js
index 1246b95..5030790 100644
--- c/core/modules/history/js/history.js
+++ i/core/modules/history/js/history.js
@@ -103,7 +103,7 @@
      * @param Number contentTimestamp
      *   The time at which some content (e.g. a comment) was published.
      *
-     * @return bool
+     * @return Boolean
      *   Whether a server check is necessary for the given node and its timestamp.
      */
     needsServerCheck: function (nodeID, contentTimestamp) {
diff --git c/core/modules/quickedit/js/models/EntityModel.js i/core/modules/quickedit/js/models/EntityModel.js
index 755135b..e850065 100644
--- c/core/modules/quickedit/js/models/EntityModel.js
+++ i/core/modules/quickedit/js/models/EntityModel.js
@@ -493,7 +493,7 @@
     /**
      * @param Array acceptedFieldStates
      *   @see validate()
-     * @return bool
+     * @return Boolean
      */
     _fieldsHaveAcceptableStates: function (acceptedFieldStates) {
       var accept = true;
@@ -601,7 +601,7 @@
      *   One of Drupal.quickedit.EntityModel.states.
      * @param String to
      *   One of Drupal.quickedit.EntityModel.states.
-     * @return bool
+     * @return Boolean
      */
     followsStateSequence: function (from, to) {
       return _.indexOf(this.states, from) < _.indexOf(this.states, to);
diff --git c/core/modules/quickedit/js/models/FieldModel.js i/core/modules/quickedit/js/models/FieldModel.js
index 0e16c7a..6bd4e44 100644
--- c/core/modules/quickedit/js/models/FieldModel.js
+++ i/core/modules/quickedit/js/models/FieldModel.js
@@ -246,7 +246,7 @@
      *   One of Drupal.quickedit.FieldModel.states.
      * @param String to
      *   One of Drupal.quickedit.FieldModel.states.
-     * @return bool
+     * @return Boolean
      */
     followsStateSequence: function (from, to) {
       return _.indexOf(this.states, from) < _.indexOf(this.states, to);
diff --git c/core/modules/quickedit/js/quickedit.js i/core/modules/quickedit/js/quickedit.js
index 64c88dd..238ba0d 100644
--- c/core/modules/quickedit/js/quickedit.js
+++ i/core/modules/quickedit/js/quickedit.js
@@ -448,7 +448,7 @@
    *     - DOM el: element pointing to the contextual links placeholder for this
    *       entity.
    *     - DOM region: element pointing to the contextual region for this entity.
-   * @return bool
+   * @return Boolean
    *   Returns true when a contextual the given contextual link metadata can be
    *   removed from the queue (either because the contextual link has been set up
    *   or because it is certain that in-place editing is not allowed for any of