diff --git a/src/Uno.Foundation.Runtime.WebAssembly/Interop/Runtime.wasm.cs b/src/Uno.Foundation.Runtime.WebAssembly/Interop/Runtime.wasm.cs
index 16d1077e3737..982c579ddc24 100644
--- a/src/Uno.Foundation.Runtime.WebAssembly/Interop/Runtime.wasm.cs
+++ b/src/Uno.Foundation.Runtime.WebAssembly/Interop/Runtime.wasm.cs
@@ -43,7 +43,7 @@ private static IntPtr GetMethodId(string methodName)
 		{
 			if (!MethodMap.TryGetValue(methodName, out var methodId))
 			{
-				MethodMap[methodName] = methodId = WebAssembly.JSInterop.InternalCalls.InvokeJSUnmarshalled(out _, methodName, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero);
+				MethodMap[methodName] = methodId = WebAssembly.Runtime.InvokeJSUnmarshalled(methodName, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero);
 			}
 
 			return methodId;
@@ -129,22 +129,15 @@ private static bool InnerInvokeJSUnmarshalled(string functionIdentifier, IntPtr
 			exception = null;
 			var methodId = GetMethodId(functionIdentifier);
 
-			var res = WebAssembly.JSInterop.InternalCalls.InvokeJSUnmarshalled(out var exceptionMessage, null, methodId, arg0, IntPtr.Zero);
-
-			if (!string.IsNullOrEmpty(exceptionMessage))
+			try
 			{
-				if (_trace.IsEnabled)
-				{
-					_trace.WriteEvent(
-						TraceProvider.InvokeException,
-						new object[] { functionIdentifier, exceptionMessage }
-					);
-				}
-
-				exception = new Exception(exceptionMessage);
+				return WebAssembly.Runtime.InvokeJSUnmarshalled(null, methodId, arg0, IntPtr.Zero) != 0;
+			}
+			catch (Exception e)
+			{
+				exception = e;
+				return false;
 			}
-
-			return res != IntPtr.Zero;
 		}
 
 		/// <summary>
@@ -181,22 +174,7 @@ private static bool InnerInvokeJSUnmarshalled(string functionIdentifier, IntPtr
 		{
 			var methodId = GetMethodId(functionIdentifier);
 
-			var res = WebAssembly.JSInterop.InternalCalls.InvokeJSUnmarshalled(out var exception, null, methodId, arg0, arg1);
-
-			if (exception != null)
-			{
-				if (_trace.IsEnabled)
-				{
-					_trace.WriteEvent(
-						TraceProvider.InvokeException,
-						new object[] { functionIdentifier, exception.ToString() }
-					);
-				}
-
-				throw new Exception(exception);
-			}
-
-			return res != IntPtr.Zero;
+			return WebAssembly.Runtime.InvokeJSUnmarshalled(null, methodId, arg0, arg1) != 0;
 		}
 
 #pragma warning disable CA2211
diff --git a/src/Uno.Foundation.Runtime.WebAssembly/Interop/WebAssembly.Runtime.cs b/src/Uno.Foundation.Runtime.WebAssembly/Interop/WebAssembly.Runtime.cs
index 359ab371fbe3..ea1b962275f3 100644
--- a/src/Uno.Foundation.Runtime.WebAssembly/Interop/WebAssembly.Runtime.cs
+++ b/src/Uno.Foundation.Runtime.WebAssembly/Interop/WebAssembly.Runtime.cs
@@ -2,60 +2,28 @@
 using System.ComponentModel;
 using System.Reflection;
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices.JavaScript;
 using Uno.Foundation.Runtime.WebAssembly.Interop;
 
 namespace WebAssembly
 {
 	[Obfuscation(Feature = "renaming", Exclude = true)]
-	internal sealed class Runtime
+	internal sealed partial class Runtime
 	{
-		internal static bool RethrowNativeExceptions { get; set; } = true;
-
-		/// <summary>
-		/// Mono specific internal call.
-		/// </summary>
-		[MethodImpl(MethodImplOptions.InternalCall)]
-		private static extern string InvokeJS(string str, out int exceptional_result);
-
-		// Disable inlining to avoid the interpreter to evaluate an internal call that may not be available
-		[MethodImpl(MethodImplOptions.NoInlining)]
-		private static string NetCoreInvokeJS(string str, out int exceptionResult)
-			=> Interop.Runtime.InvokeJS(str, out exceptionResult);
-
 		/// <summary>
 		/// Invokes Javascript code in the hosting environment
 		/// </summary>
-		internal static string InvokeJS(string str)
-		{
-			int exceptionResult;
-			var result = NetCoreInvokeJS(str, out exceptionResult);
+		[JSImport("globalThis.Uno.UI.Interop.Runtime.InvokeJS")]
+		internal static partial string InvokeJS(string value);
 
-			if (exceptionResult != 0)
-			{
-				var errorMessage = $"Error #{exceptionResult} \"{result}\" executing javascript: \"{str}\"";
-				if (RethrowNativeExceptions)
-				{
-					throw new InvalidOperationException(errorMessage);
-				}
-				else
-				{
-					Console.Error.WriteLine(errorMessage);
-				}
-			}
-			return result;
-		}
+		[JSImport("globalThis.MonoSupport.jsCallDispatcher.invokeJSUnmarshalled")]
+		internal static partial IntPtr InvokeJSUnmarshalled(string functionIdentifier, IntPtr arg0, IntPtr arg1, IntPtr arg2);
 	}
 
 	namespace JSInterop
 	{
 		internal static class InternalCalls
 		{
-			// Matches this signature:
-			// https://github.com/mono/mono/blob/f24d652d567c4611f9b4e3095be4e2a1a2ab23a4/sdks/wasm/driver.c#L21
-			[MethodImpl(MethodImplOptions.InternalCall)]
-			[EditorBrowsable(EditorBrowsableState.Never)]
-			public static extern IntPtr InvokeJSUnmarshalled(out string exceptionMessage, string functionIdentifier, IntPtr arg0, IntPtr arg1, IntPtr arg2);
-
 			// Uno-Specific implementation for https://github.com/dotnet/runtime/issues/69409.
 			// To be removed when the runtime will support the main SynchronizationContext.
 			[MethodImplAttribute(MethodImplOptions.InternalCall)]
diff --git a/src/Uno.Foundation/FoundationFeatureConfiguration.cs b/src/Uno.Foundation/FoundationFeatureConfiguration.cs
index b1b433ca7f48..5ea990c914e9 100644
--- a/src/Uno.Foundation/FoundationFeatureConfiguration.cs
+++ b/src/Uno.Foundation/FoundationFeatureConfiguration.cs
@@ -38,8 +38,9 @@ public static class Runtime
 		/// </summary>
 		public static bool RethrowNativeExceptions
 		{
-			get => WebAssembly.Runtime.RethrowNativeExceptions;
-			set => WebAssembly.Runtime.RethrowNativeExceptions = value;
+			// Obsolete, remove in next major
+			get => true;
+			set { }
 		}
 	}
 #endif
diff --git a/src/Uno.UI/ts/Interop/Runtime.ts b/src/Uno.UI/ts/Interop/Runtime.ts
index 2d269098047e..8babfa74e0d4 100644
--- a/src/Uno.UI/ts/Interop/Runtime.ts
+++ b/src/Uno.UI/ts/Interop/Runtime.ts
@@ -5,5 +5,9 @@
 		private static init(): any {
 			return "";
 		}
+
+		public static InvokeJS(command: string) : string {
+			return eval(command);
+		}
 	}
-}
\ No newline at end of file
+}
diff --git a/src/Uno.UI/ts/MonoSupport.ts b/src/Uno.UI/ts/MonoSupport.ts
index faa7ad6c07bd..949427808fae 100644
--- a/src/Uno.UI/ts/MonoSupport.ts
+++ b/src/Uno.UI/ts/MonoSupport.ts
@@ -22,6 +22,23 @@ namespace MonoSupport {
 			jsCallDispatcher.registrations.set(identifier, instance);
 		}
 
+		public static invokeJSUnmarshalled(funcName: string, arg0: any, arg1: any, arg2: any): void | number {
+			const funcInstance = jsCallDispatcher.findJSFunction(funcName);
+
+			let ret = funcInstance.call(null, arg0, arg1, arg2);
+
+			switch (typeof ret) {
+				case "boolean":
+					return ret ? 1 : 0;
+				case "undefined":
+					return 0;
+				case "number":
+					return ret;
+				default:
+					throw new Error(`Function ${funcName} returned an unsupported type: ${typeof ret}`);
+			}
+		}
+
 		public static findJSFunction(identifier: string): any {
 
 			if (!identifier) {