diff --git a/client/src/views/fields/attachment-multiple.js b/client/src/views/fields/attachment-multiple.js
index e3b87220e4..dbd9d89092 100644
--- a/client/src/views/fields/attachment-multiple.js
+++ b/client/src/views/fields/attachment-multiple.js
@@ -80,8 +80,11 @@ class AttachmentMultipleFieldView extends BaseFieldView {
     idsName
     nameHash
     foreignScope
-    showPreviews = true
     accept = null
+    /** @protected */
+    showPreviews = true
+    /** @protected */
+    showPreviewsInListMode = false
 
     /**
      * @inheritDoc
diff --git a/client/src/views/stream/fields/attachment-multiple.js b/client/src/views/stream/fields/attachment-multiple.js
index 75746386d5..beaf985ef0 100644
--- a/client/src/views/stream/fields/attachment-multiple.js
+++ b/client/src/views/stream/fields/attachment-multiple.js
@@ -26,12 +26,11 @@
  * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
  ************************************************************************/
 
-define('views/stream/fields/attachment-multiple', ['views/fields/attachment-multiple'], function (Dep) {
+import AttachmentMultipleFieldView from 'views/fields/attachment-multiple';
 
-    return Dep.extend({
+export default class extends AttachmentMultipleFieldView {
 
-        showPreviews: true,
+    showPreviews = true
+    showPreviewsInListMode = true
+}
 
-        showPreviewsInListMode: true,
-    });
-});
diff --git a/client/src/views/stream/fields/post.js b/client/src/views/stream/fields/post.js
index 7d78a2b556..62381802c7 100644
--- a/client/src/views/stream/fields/post.js
+++ b/client/src/views/stream/fields/post.js
@@ -26,29 +26,29 @@
  * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
  ************************************************************************/
 
-define('views/stream/fields/post', ['views/fields/text'], function (Dep) {
+import TextFieldView from 'views/fields/text';
 
-    return Dep.extend({
+export default class StreamPostFieldView extends TextFieldView {
 
-        getValueForDisplay: function () {
-            let text = Dep.prototype.getValueForDisplay.call(this);
+    getValueForDisplay() {
+        let text = super.getValueForDisplay();
 
-            if (this.isDetailMode() || this.isListMode()) {
-                let mentionData = (this.model.get('data') || {}).mentions || {};
+        if (this.isDetailMode() || this.isListMode()) {
+            /** @type {Record} */
+            const data = this.model.get('data') || {};
 
-                Object
-                    .keys(mentionData)
-                    .sort((a, b) => {
-                        return a.length < b.length;
-                    })
-                    .forEach(item => {
-                        var part = '[' + mentionData[item].name + '](#User/view/'+mentionData[item].id + ')';
+            /** @type {Record} */
+            const mentionData = data.mentions || {};
 
-                        text = text.replace(new RegExp(item, 'g'), part);
-                    });
-            }
+            Object.keys(mentionData)
+                .sort((a, b) => b.length - a.length)
+                .forEach(item => {
+                    const part = `[${mentionData[item].name}](#User/view/${mentionData[item].id})`;
 
-            return text;
-        },
-    });
-});
+                    text = text.replace(new RegExp(item, 'g'), part);
+                });
+        }
+
+        return text;
+    }
+}
diff --git a/client/src/views/stream/message.js b/client/src/views/stream/message.js
index 644a034368..086e210c8b 100644
--- a/client/src/views/stream/message.js
+++ b/client/src/views/stream/message.js
@@ -36,12 +36,12 @@ class MessageStreamView extends View {
 
     setup() {
         let template = this.options.messageTemplate;
-        let data = Espo.Utils.clone(this.options.messageData || {});
+        const data = Espo.Utils.clone(this.options.messageData || {});
 
         this.dataForTemplate = {};
 
         for (let key in data) {
-            let value = data[key] || '';
+            const value = data[key] || '';
 
             if (key.indexOf('html:') === 0) {
                 key = key.substring(5);
@@ -70,10 +70,10 @@ class MessageStreamView extends View {
             }
 
             if (value.indexOf('field:') === 0) {
-                let field = value.substring(6);
+                const field = value.substring(6);
                 this.createField(key, field);
 
-                let keyEscaped = this.getHelper().escapeString(key);
+                const keyEscaped = this.getHelper().escapeString(key);
 
                 template = template.replace(
                     '{' + key + '}',
@@ -84,7 +84,7 @@ class MessageStreamView extends View {
             }
 
             this.dataForTemplate[key] = value;
-            template = template.replace('{' + key + '}', '{{' + key + '}}');
+            template = template.replace(`{${key}}`, `{{${key}}}`);
         }
 
         this.templateContent = template;