diff --git a/app/javascript/dashboard/helper/specs/editorHelper.spec.js b/app/javascript/dashboard/helper/specs/editorHelper.spec.js
index 1c79d6e21..48a21031f 100644
--- a/app/javascript/dashboard/helper/specs/editorHelper.spec.js
+++ b/app/javascript/dashboard/helper/specs/editorHelper.spec.js
@@ -6,6 +6,48 @@ import {
   extractTextFromMarkdown,
 } from '../editorHelper';
 
+// 🚨 Why mock @chatwoot/prosemirror-schema?
+// If we don't mock it we will get an error like this
+//     SyntaxError: Cannot use import statement outside a module
+// This is because one of the imports inside @prosemirror/schema is not a module
+// It's prosemirror-history, it is written in typescript, but seems like it's not exported properly
+// We cannot do much about it, except mock it
+//
+// Including `ts-jest` and `typescript` should potentially fix it
+// but a problem exists with babel and jest versions, babel uses core-js 3,
+// which has a conflict with the browser name for `opera_mobile`,
+// this breaks the build
+// the best solution in that case is to mock the function with a closest implementation
+//
+// In the future, we could also mock this using MarkdownIt and TurnDown
+// import MarkdownIt from "markdown-it";
+// import Turndown from "turndown";
+//
+// const forward = new MarkdownIt("commonmark");
+// const reverse = new Turndown()
+// const commonMark = reverse.turndown(forward.render(signature))
+//
+// At the moment it's not necessary, but if we need to do more complex
+// transformations, we can use the above approach
+jest.mock('@chatwoot/prosemirror-schema', () => ({
+  messageSchema: 'mocked messageSchema',
+  MessageMarkdownTransformer: () => {
+    return {
+      parse: jest.fn().mockImplementation(candidate => {
+        return candidate
+          .trim()
+          .replace(/\r\n?/g, '\n')
+          .split('\n')
+          .map(line => line.replace(/\s+$/, ''))
+          .join('\n');
+      }),
+    };
+  },
+  MessageMarkdownSerializer: {
+    serialize: candidate => candidate,
+  },
+}));
+
 const NEW_SIGNATURE = 'This is a new signature';
 
 const DOES_NOT_HAVE_SIGNATURE = {
@@ -20,7 +62,7 @@ const DOES_NOT_HAVE_SIGNATURE = {
   signature_has_images: {
     body: 'This is a test',
     signature:
-      'Testing \n![](http://localhost:3000/rails/active_storage/blobs/redirect/some-hash/image.png)',
+      'Testing\n![](http://localhost:3000/rails/active_storage/blobs/redirect/some-hash/image.png)',
   },
 };