From e3deafedf39bdbfd206a2e8bcc5f919136eebecf Mon Sep 17 00:00:00 2001
From: Sipke Schoorstra <sipkeschoorstra@outlook.com>
Date: Fri, 20 Jan 2023 19:26:38 +0100
Subject: [PATCH] Add toJson JS function

The Jint implementation of JSON.stringify only supports a limited set of objects (not .NET LocalDate for example)
---
 .../Implementations/JintJavaScriptEvaluator.cs               | 4 +++-
 .../Providers/CommonFunctionDefinitionProvider.cs            | 5 +++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/modules/Elsa.JavaScript/Implementations/JintJavaScriptEvaluator.cs b/src/modules/Elsa.JavaScript/Implementations/JintJavaScriptEvaluator.cs
index 9f89a334f..a1e64708a 100644
--- a/src/modules/Elsa.JavaScript/Implementations/JintJavaScriptEvaluator.cs
+++ b/src/modules/Elsa.JavaScript/Implementations/JintJavaScriptEvaluator.cs
@@ -1,4 +1,5 @@
-using Elsa.Expressions.Models;
+using System.Text.Json;
+using Elsa.Expressions.Models;
 using Elsa.Extensions;
 using Elsa.JavaScript.Notifications;
 using Elsa.JavaScript.Options;
@@ -61,6 +62,7 @@ public class JintJavaScriptEvaluator : IJavaScriptEvaluator
         
         engine.SetValue("isNullOrWhiteSpace", (Func<string, bool>)string.IsNullOrWhiteSpace);
         engine.SetValue("isNullOrEmpty", (Func<string, bool>)string.IsNullOrEmpty);
+        engine.SetValue("toJson", (Func<object, string>)(value => JsonSerializer.Serialize(value)));
 
         // Add common .NET types.
         engine.RegisterType<DateTime>();
diff --git a/src/modules/Elsa.JavaScript/Providers/CommonFunctionDefinitionProvider.cs b/src/modules/Elsa.JavaScript/Providers/CommonFunctionDefinitionProvider.cs
index 3f96e6869..031f84bf5 100644
--- a/src/modules/Elsa.JavaScript/Providers/CommonFunctionDefinitionProvider.cs
+++ b/src/modules/Elsa.JavaScript/Providers/CommonFunctionDefinitionProvider.cs
@@ -41,6 +41,11 @@ internal class CommonFunctionDefinitionProvider : FunctionDefinitionProvider
             .Parameter("value", "string")
             .ReturnType("boolean"));
         
+        yield return CreateFunctionDefinition(builder => builder
+            .Name("toJson")
+            .Parameter("value", "any")
+            .ReturnType("string"));
+        
         // Variable getter and setters.
         foreach (var variable in context.Variables)
         {