diff --git a/js/plugins/backdropimage/plugin.js b/js/plugins/backdropimage/plugin.js
index 273bdb4..88fc1fc 100644
--- a/js/plugins/backdropimage/plugin.js
+++ b/js/plugins/backdropimage/plugin.js
@@ -17,14 +17,14 @@
     let node = editor.selection.getNode();
     let existingValues = {};
 
-    if (node.nodeName == 'IMG') {
+    if (node.nodeName === 'IMG') {
       let attribs = node.getAttributeNames();
       for (let i = 0; i < attribs.length; i++) {
         let name = attribs[i];
         if (name.startsWith('data-mce')) {
           continue;
         }
-        existingValues[name] = node.attributes[name]['value'];
+        existingValues[name] = node.attributes[name].value;
       }
       let parentFigure = editor.dom.getParents(node, 'FIGURE');
       if (parentFigure.length) {
@@ -33,7 +33,7 @@
     }
 
     return existingValues;
-  }
+  };
 
   /**
    * Opens a Backdrop dialog.
@@ -46,7 +46,7 @@
     let saveCallback = function(returnValues) {
       let image = buildImage(editor, returnValues);
       let selected = editor.selection.getNode();
-      if (selected.nodeName == 'IMG') {
+      if (selected.nodeName === 'IMG') {
         let parentFigure = editor.dom.getParents(selected, 'FIGURE');
         let parentLink = editor.dom.getParents(selected, 'A');
         if (parentFigure.length) {
@@ -64,13 +64,13 @@
         imgToSize.onload = function() {
           imgDomnode.setAttribute('width', this.width);
           imgDomnode.setAttribute('height', this.height);
-        }
+        };
         imgToSize.src = src;
       }
     };
 
     Backdrop.tinymce.openDialog(editor, dialogUrl, existingValues, saveCallback, dialogSettings);
-  }
+  };
 
   /**
    * Builds the image markup.
@@ -101,10 +101,10 @@
       node = editor.dom.create('figure', figAttrib);
       let img = editor.dom.create('img');
       for (let key in values) {
-        if (key == 'data-has-caption') {
+        if (key === 'data-has-caption') {
           continue;
         }
-        if (key == 'data-file-id' && !values[key]) {
+        if (key === 'data-file-id' && !values[key]) {
           continue;
         }
         img.setAttribute(key, values[key]);
@@ -123,7 +123,7 @@
       if (parentFigure.length) {
         let parent = parentFigure[0];
         for (let i = 0; i < parent.childNodes.length; i++) {
-          if (parent.childNodes[i].nodeName == 'FIGCAPTION') {
+          if (parent.childNodes[i].nodeName === 'FIGCAPTION') {
             captiontext = parent.childNodes[i].innerHTML;
             break;
           }
@@ -135,10 +135,10 @@
     else {
       let img = editor.dom.create('img');
       for (let key in values) {
-        if (key == 'data-has-caption') {
+        if (key === 'data-has-caption') {
           continue;
         }
-        if (key == 'data-file-id' && !values[key]) {
+        if (key === 'data-file-id' && !values[key]) {
           continue;
         }
         img.setAttribute(key, values[key]);
@@ -152,7 +152,7 @@
       }
     }
     return node.outerHTML;
-  }
+  };
 
   /**
    * Parses an array of AstNodes into a string.
@@ -181,7 +181,7 @@
       }
     }
     return dummy.innerHTML;
-  }
+  };
 
   /**
    * Turns an attribute string into an AstNode instance.
@@ -198,7 +198,7 @@
 
     for (let i = 0; i < domNode.childNodes.length; i++) {
       let n = domNode.childNodes[i];
-      if (n.nodeName == '#text') {
+      if (n.nodeName === '#text') {
         let text = new tinymce.html.Node('#text', 3);
         text.value = n.textContent;
         caption.append(text);
@@ -213,7 +213,7 @@
       }
     }
     return caption;
-  }
+  };
 
   /**
    * Checks if a dom node is relevant for this plugin.
@@ -225,7 +225,7 @@
    *   True if this tag is something, this plugin handles.
    */
   const isRegularImg = function (node) {
-    if (node.nodeName != 'IMG') {
+    if (node.nodeName !== 'IMG') {
       return false;
     }
     if (node.hasAttribute('data-mce-object') || node.hasAttribute('data-mce-placeholder')) {
@@ -235,7 +235,7 @@
       return false;
     }
     return true;
-  }
+  };
 
   // Register plugin features.
   tinymce.PluginManager.add('backdropimage', function(editor, url) {
@@ -246,11 +246,11 @@
           // These "node" are AstNode, not dom node.
           // @see https://www.tiny.cloud/docs/tinymce/6/apis/tinymce.html.node/#Node
           let link;
-          if (nodes[i].parent.name == 'a') {
+          if (nodes[i].parent.name === 'a') {
             link = nodes[i].parent.clone();
             nodes[i].parent.unwrap();
           }
-          if (nodes[i].parent.name == 'p') {
+          if (nodes[i].parent.name === 'p') {
             nodes[i].parent.unwrap();
           }
           let img = nodes[i].clone();
@@ -343,7 +343,7 @@
         });
         // @see https://github.com/backdrop-contrib/tinymce/issues/56
         editor.on('ObjectSelected', function (obj) {
-          if (obj.target.nodeName != 'IMG') {
+          if (obj.target.nodeName !== 'IMG') {
             return;
           }
           editor.selection.select(obj.target);
diff --git a/js/plugins/backdroplink/plugin.js b/js/plugins/backdroplink/plugin.js
index 9032012..5300e44 100644
--- a/js/plugins/backdroplink/plugin.js
+++ b/js/plugins/backdroplink/plugin.js
@@ -19,7 +19,7 @@
 
     let saveCallback = function(returnValues) {
       let link = buildLink(editor, returnValues);
-      if (typeof existingValues.href == 'undefined') {
+      if (typeof existingValues.href === 'undefined') {
         editor.execCommand('mceInsertContent', false, link);
       }
       else {
@@ -28,7 +28,7 @@
     };
 
     Backdrop.tinymce.openDialog(editor, dialogUrl, existingValues, saveCallback, dialogSettings);
-  }
+  };
 
   /**
    * @param object editor
@@ -42,11 +42,11 @@
     let existingValues = {};
 
     // This image is already wrapped in a link.
-    if (node.nodeName == 'IMG' && node.parentNode.nodeName == 'A') {
+    if (node.nodeName === 'IMG' && node.parentNode.nodeName === 'A') {
       node = node.parentNode;
     }
 
-    if (node.nodeName == 'A') {
+    if (node.nodeName === 'A') {
       // Expand selection to whole anchor to prevent inserting a link into a link.
       editor.selection.select(node);
       if (node.textContent) {
@@ -59,10 +59,10 @@
         if (name.startsWith('data-mce')) {
           continue;
         }
-        existingValues[name] = node.attributes[name]['value'];
+        existingValues[name] = node.attributes[name].value;
       }
     }
-    else if (node.nodeName != 'IMG') {
+    else if (node.nodeName !== 'IMG') {
       let content = editor.selection.getContent({ format: 'text' });
       existingValues = {
         text: content
@@ -70,7 +70,7 @@
     }
 
     return existingValues;
-  }
+  };
 
   /**
    * Builds link markup.
@@ -88,23 +88,23 @@
 
     let a = editor.dom.create('a');
     for (let key in values) {
-      if (key == 'text') {
+      if (key === 'text') {
         textContent = values[key];
         continue;
       }
-      if (key == 'data-file-id' && !values[key]) {
+      if (key === 'data-file-id' && !values[key]) {
         continue;
       }
       a.setAttribute(key, values[key]);
     }
 
     let node = editor.selection.getNode();
-    if (node.nodeName == 'IMG') {
+    if (node.nodeName === 'IMG') {
       let clone = node.cloneNode(true);
       clone.removeAttribute('data-mce-src');
       a.appendChild(clone);
     }
-    else if (node.nodeName == 'A' && node.childNodes.length) {
+    else if (node.nodeName === 'A' && node.childNodes.length) {
       for (let i = 0; i < node.childNodes.length; i++) {
         let clone = node.childNodes[i].cloneNode(true);
         a.appendChild(clone);
@@ -121,7 +121,7 @@
       return a.innerHTML;
     }
     return a.outerHTML;
-  }
+  };
 
   // Register plugin features.
   tinymce.PluginManager.add('backdroplink', function(editor, url) {
@@ -136,7 +136,7 @@
         editor.on('SelectionChange', function () {
           let node = editor.selection.getNode();
           // The anchor plugin marks its links as not editable.
-          if (node.nodeName == 'A' && node.isContentEditable) {
+          if (node.nodeName === 'A' && node.isContentEditable) {
             api.setActive(true);
           }
           else {
@@ -155,7 +155,7 @@
         api.setEnabled(false);
         editor.on('SelectionChange', function () {
           let node = editor.selection.getNode();
-          if (node.nodeName == 'A' || node.parentNode.nodeName == 'A') {
+          if (node.nodeName === 'A' || node.parentNode.nodeName === 'A') {
             api.setEnabled(true);
           }
           else {
diff --git a/js/plugins/backdroplistprop/plugin.js b/js/plugins/backdroplistprop/plugin.js
index a328c46..3a98d96 100644
--- a/js/plugins/backdroplistprop/plugin.js
+++ b/js/plugins/backdroplistprop/plugin.js
@@ -68,7 +68,7 @@
         api.close();
       }
     });
-  }
+  };
 
   /**
    * Get the Dom parent OL if exists.
@@ -79,11 +79,11 @@
    */
   const getOlParent = function (node) {
     const closestLi = node.closest('li');
-    if (closestLi && closestLi.parentNode.nodeName == 'OL') {
+    if (closestLi && closestLi.parentNode.nodeName === 'OL') {
       return closestLi.parentNode;
     }
     return false;
-  }
+  };
 
   // Register plugin features.
   tinymce.PluginManager.add('backdroplistprop', function(editor, url) {
diff --git a/js/plugins/liststyle/plugin.js b/js/plugins/liststyle/plugin.js
index bb48b22..8f35d5c 100644
--- a/js/plugins/liststyle/plugin.js
+++ b/js/plugins/liststyle/plugin.js
@@ -13,7 +13,7 @@
           let attrValue = nodes[i].attr('data-list-style');
           let otherStyles = nodes[i].attr('style');
           let listStyle = 'list-style-type: ' + attrValue + ';';
-          if (typeof otherStyles == 'undefined') {
+          if (typeof otherStyles === 'undefined') {
             nodes[i].attr('style', listStyle);
           }
           else {
@@ -24,7 +24,7 @@
       });
       editor.serializer.addAttributeFilter('style', function (nodes) {
         for (let i = 0; i < nodes.length; i++) {
-          if (nodes[i].name != 'ul' && nodes[i].name != 'ol') {
+          if (nodes[i].name !== 'ul' && nodes[i].name !== 'ol') {
             continue;
           }
           let styles = nodes[i].attr('style');
@@ -35,7 +35,7 @@
               continue;
             }
             let keyVal = stylesArr[n].split(':');
-            if (keyVal[0].trim() == 'list-style-type') {
+            if (keyVal[0].trim() === 'list-style-type') {
               nodes[i].attr('data-list-style', keyVal[1].trim());
             }
             else {
diff --git a/js/tinymce-admin.js b/js/tinymce-admin.js
index 23df3f0..e952a89 100644
--- a/js/tinymce-admin.js
+++ b/js/tinymce-admin.js
@@ -9,7 +9,7 @@
 Backdrop.behaviors.tinymceAdmin = {
   attach: function (context, settings) {
     let selectedEditor = $('select[name="editor"]').val();
-    if (selectedEditor != 'tinymce') {
+    if (selectedEditor !== 'tinymce') {
       return;
     }
     let selectProfile = $('#edit-editor-settings-tinymce-settings-profile');
@@ -28,7 +28,7 @@ Backdrop.behaviors.tinymceAdmin = {
   },
   detach: function () {
     let selected = $('#edit-editor-settings-tinymce-settings-profile').val();
-    if (typeof selected == 'undefined') {
+    if (typeof selected === 'undefined') {
       return;
     }
     let featureList = Backdrop.behaviors.tinymceAdmin.buildFeatures();
diff --git a/js/tinymce-dragdrop.js b/js/tinymce-dragdrop.js
index c7bc04f..b9a11c1 100644
--- a/js/tinymce-dragdrop.js
+++ b/js/tinymce-dragdrop.js
@@ -26,21 +26,21 @@
 
       // Keyboard navigation.
       $('#edit-tb .tinybutton').on('keydown', function (ev) {
-        if ($(this).parent().attr('id') == 'buttons-active') {
+        if ($(this).parent().attr('id') === 'buttons-active') {
           // 39 = Arrow right.
-          if (ev.which == 39) {
+          if (ev.which === 39) {
             $(this).insertAfter($(this).next());
             $(this).focus();
             updateFormItem();
           }
           // 37 = Arrow left.
-          else if (ev.which == 37) {
+          else if (ev.which === 37) {
             $(this).insertBefore($(this).prev());
             $(this).focus();
             updateFormItem();
           }
           // 173 = "-" key.
-          else if (ev.which == 173) {
+          else if (ev.which === 173) {
             $(this).next().focus();
             $(this).appendTo('#buttons-available');
             let message = Backdrop.t('%button removed from active elements.', {
@@ -52,7 +52,7 @@
         }
         else {
           // 171 = "+" key.
-          if (ev.which == 171) {
+          if (ev.which === 171) {
             $(this).appendTo('#buttons-active');
             $(this).focus();
             let message = Backdrop.t('%button added to active elements.', {
@@ -80,7 +80,7 @@
           });
           $('#edit-toolbar').val(toolbarconf);
         }, 500);
-      }
+      };
     }
-  }
+  };
 })(jQuery, Backdrop);
diff --git a/js/tinymce-integration.js b/js/tinymce-integration.js
index 353d0e9..fd07588 100644
--- a/js/tinymce-integration.js
+++ b/js/tinymce-integration.js
@@ -36,8 +36,8 @@
         // Layouts block editing: image dialog opened from a block dialog,
         // results in upload (paste) handler to be undefined (nested iframes).
         // Only happens, if js aggregation is off.
-        if (typeof tinymceImageUploadHandler == 'function') {
-          options.images_upload_handler = tinymceImageUploadHandler;
+        if (typeof tinymceImageUploadHandler === 'function') {
+          options.images_upload_handler = tinymceImageUploadHandler;// jshint ignore:line
         }
         else {
           // We turn off pasting images in this case. Selecting via library, or
@@ -50,14 +50,14 @@
       let contentLang = options.language;
       // If this element's form has a language select list, toggle content lang
       // based on that value.
-      if (element.form.querySelector('#edit-langcode') != null) {
+      if (element.form.querySelector('#edit-langcode') !== null) {
         let languageToggle = element.form.querySelector('#edit-langcode');
-        if (languageToggle.value != 'und') {
+        if (languageToggle.value !== 'und') {
           contentLang = languageToggle.value;
         }
         languageToggle.addEventListener('change', function (ev) {
           let langcode = ev.target.value;
-          if (langcode == 'und') {
+          if (langcode === 'und') {
             langcode = options.language;
           }
           let event = new CustomEvent('contentLangSwitch', { detail: langcode });
@@ -78,7 +78,7 @@
           // @see https://github.com/tinymce/tinymce/issues/4830
           editor.contentDocument.documentElement.setAttribute('lang', contentLang);
           // Unregister formats, if any.
-          if (typeof format.editorSettings.unregisterFmts != 'undefined') {
+          if (typeof format.editorSettings.unregisterFmts !== 'undefined') {
             let fmts = format.editorSettings.unregisterFmts;
             for (let i = 0; i < fmts.length; i++) {
               editor.formatter.unregister(fmts[i]);
@@ -89,7 +89,7 @@
           editor.addCommand('indent', function () {});
           editor.addCommand('outdent', function () {});
           // Register custom icons provided by plugins.
-          if (typeof format.editorSettings.iconRegistry != 'undefined') {
+          if (typeof format.editorSettings.iconRegistry !== 'undefined') {
             let icons = format.editorSettings.iconRegistry;
             for (let name in icons) {
               editor.ui.registry.addIcon(name, icons[name]);
@@ -115,7 +115,7 @@
     },
 
     detach: function (element, format, trigger) {
-      if (trigger == 'serialize') {
+      if (trigger === 'serialize') {
         tinymce.triggerSave();
         return;
       }
@@ -142,7 +142,7 @@
         autoResize: true,
         modal: true,
         target: '#tinymce-modal'
-      }
+      };
       new Backdrop.ajax('tinymce-modal', $content.find('a').get(0), {
         accepts: 'application/vnd.backdrop-dialog',
         dialog: dialogSettings,
@@ -165,7 +165,7 @@
       }, 500);
       Backdrop.tinymce.saveCallback = saveCallback;
     }
-  }
+  };
   $(window).on('dialog:beforecreate', function (e, dialog, $element, settings) {
     $('.tinymce-dialog-loading').animate({top: '-40px'}, function () {
       $(this).remove();
@@ -181,7 +181,7 @@
 
   // Fires when hitting dialog Save or Close buttons.
   $(window).on('dialogclose', function(event, ui) {
-    if (event.target.id == 'tinymce-modal' && tinymce.activeEditor) {
+    if (event.target.id === 'tinymce-modal' && tinymce.activeEditor) {
       tinymce.activeEditor.iframeElement.focus();
     }
   });