diff -u b/core/misc/message.es6.js b/core/misc/message.es6.js
--- b/core/misc/message.es6.js
+++ b/core/misc/message.es6.js
@@ -36,7 +36,7 @@
     static defaultWrapper() {
       const wrapper = document.querySelector('[data-drupal-messages]');
       if (!wrapper) {
-        throw new Error(Drupal.t('There is no @element on the page.', { '@element': '[data-drupal-messages]' }));
+        throw new Error('There is no [data-drupal-messages] on the page.')
       }
       return wrapper.innerHTML === '' ? Drupal.message.messageInternalWrapper(wrapper) : wrapper.firstElementChild;
     }
@@ -47,7 +47,7 @@
      * @return {Object}
      *   An object containing message type strings.
      */
-    static getMessageTypes() {
+    static getMessageTypeLabels() {
       return {
         status: Drupal.t('Status message'),
         error: Drupal.t('Error message'),
@@ -99,8 +99,8 @@
         `${options.type}-${Math.random().toFixed(15).replace('0.', '')}`;
 
       // Throw an error if an unexpected message type is used.
-      if (!(Drupal.message.getMessageTypes().hasOwnProperty(options.type))) {
-        throw new Error(Drupal.t(`The message type, ${options.type}, is not present in Drupal.message.getMessageTypes().`));
+      if (!(Drupal.message.getMessageTypeLabels().hasOwnProperty(options.type))) {
+        throw new Error(`The message type, ${options.type}, is not present in Drupal.message.getMessageTypeLabels().`);
       }
 
       this.messageWrapper.appendChild(Drupal.theme('message', { text: message }, options));
@@ -164,7 +164,7 @@
      *   array of indexes.
      *
      * @return {number}
-     *  Number of removed messages.
+     *   Number of removed messages.
      */
     remove(ids) {
       const messages = this.select(ids);
@@ -177,7 +177,7 @@
      * @name Drupal.message~messageDefinition.clear
      *
      * @return {number}
-     *  Number of removed messages.
+     *   Number of removed messages.
      */
     clear() {
       const messages = this.messageWrapper.querySelectorAll('[data-drupal-message-id]');
@@ -247,7 +247,7 @@
    *   A DOM Node.
    */
   Drupal.theme.message = ({ text }, options) => {
-    const messagesTypes = Drupal.message.getMessageTypes();
+    const messagesTypes = Drupal.message.getMessageTypeLabels();
     const messageWraper = document.createElement('div');
     const messageText = document.createElement('h2');
     messageText.setAttribute('class', 'visually-hidden');
diff -u b/core/misc/message.js b/core/misc/message.js
--- b/core/misc/message.js
+++ b/core/misc/message.js
@@ -36,8 +36,8 @@
 
         options.id = options.id ? String(options.id) : options.type + '-' + Math.random().toFixed(15).replace('0.', '');
 
-        if (!Drupal.message.getMessageTypes().hasOwnProperty(options.type)) {
-          throw new Error(Drupal.t('The message type, ' + options.type + ', is not present in Drupal.message.getMessageTypes().'));
+        if (!Drupal.message.getMessageTypeLabels().hasOwnProperty(options.type)) {
+          throw new Error('The message type, ' + options.type + ', is not present in Drupal.message.getMessageTypeLabels().');
         }
 
         this.messageWrapper.appendChild(Drupal.theme('message', { text: message }, options));
@@ -87,13 +87,13 @@
       value: function defaultWrapper() {
         var wrapper = document.querySelector('[data-drupal-messages]');
         if (!wrapper) {
-          throw new Error(Drupal.t('There is no @element on the page.', { '@element': '[data-drupal-messages]' }));
+          throw new Error('There is no [data-drupal-messages] on the page.');
         }
         return wrapper.innerHTML === '' ? Drupal.message.messageInternalWrapper(wrapper) : wrapper.firstElementChild;
       }
     }, {
-      key: 'getMessageTypes',
-      value: function getMessageTypes() {
+      key: 'getMessageTypeLabels',
+      value: function getMessageTypeLabels() {
         return {
           status: Drupal.t('Status message'),
           error: Drupal.t('Error message'),
@@ -127,7 +127,7 @@
   Drupal.theme.message = function (_ref, options) {
     var text = _ref.text;
 
-    var messagesTypes = Drupal.message.getMessageTypes();
+    var messagesTypes = Drupal.message.getMessageTypeLabels();
     var messageWraper = document.createElement('div');
     var messageText = document.createElement('h2');
     messageText.setAttribute('class', 'visually-hidden');