Add JavaScriptModuleInstruction to custom email

Documentation/ColumnsConfig/Type/Input/Index.rst

@@ -103,7 +103,13 @@ Custom eval rules
 You can supply own form evaluations in an extension by creating a class with three functions, one which returns
 the JavaScript code for client side validation called `returnFieldJS()` and two for the server side:
 `deevaluateFieldValue()` called when opening the record and `evaluateFieldValue()` called for validation when
-saving the record:
+saving the record.
+
+.. hint::
+
+    See EXT:redirects :php:`\TYPO3\CMS\Redirects\Evaluation\SourceHost` for a
+    working example. For more information about adding JavaScript modules
+    see :ref:`ES6 in the TYPO3 Backend <t3coreapi:backend-javascript-es6>`.
 
 :file:`EXT:extension/Classes/Evaluation/ExampleEvaluation.php`
 

Documentation/ColumnsConfig/Type/Input/_Snippets/_ExampleEvaluation.php

@@ -2,6 +2,8 @@
 
 namespace MVendor\MyExtension\Evaluation;
 
+use TYPO3\CMS\Core\Page\JavaScriptModuleInstruction;
+
 /**
  * Class for field value validation/evaluation to be used in 'eval' of TCA
  */
@@ -10,11 +12,17 @@ class ExampleEvaluation
     /**
      * JavaScript code for client side validation/evaluation
      *
-     * @return string JavaScript code for client side validation/evaluation
+     * @return string|JavaScriptModuleInstruction JavaScript code for client side validation/evaluation
      */
     public function returnFieldJS()
     {
-        return 'return value + " [added by JavaScript on field blur]";';
+        // you can return JavaScript code directly:
+        //return 'return value + " [added by JavaScript on field blur]";';
+
+        // or you can use JavaScriptModuleInstruction.
+        // In this case you should add your JavaScript modules using
+        // Configuration/JavaScriptModules.php
+        return JavaScriptModuleInstruction::create('@myvendor/myextension/example-evaluation.js', 'FormEngineEvaluation');
     }
 
     /**