Address PR comments

Author: mattleibow

src/Controls/samples/Controls.Sample/Resources/Raw/HybridSamplePage/scripts/HybridWebView.js

@@ -91,20 +91,49 @@
         }
     },
 
-    "__InvokeJavaScript": function __InvokeJavaScript(taskId, methodName, args) {
-        if (methodName[Symbol.toStringTag] === 'AsyncFunction') {
-            // For async methods, we need to call the method and then trigger the callback when it's done
-            const asyncPromise = methodName(...args);
-            asyncPromise
-                .then(asyncResult => {
-                    window.HybridWebView.__TriggerAsyncCallback(taskId, asyncResult);
-                })
-                .catch(error => console.error(error));
+    "__InvokeJavaScript": async function __InvokeJavaScript(taskId, methodName, args) {
+        try {
+            var result = null;
+            if (methodName[Symbol.toStringTag] === 'AsyncFunction') {
+                result = await methodName(...args);
+            } else {
+                result = methodName(...args);
+            }
+            window.HybridWebView.__TriggerAsyncCallback(taskId, result);
+        } catch (ex) {
+            console.error(ex);
+            window.HybridWebView.__TriggerAsyncFailedCallback(taskId, ex);
+        }
+    },
+
+    "__TriggerAsyncFailedCallback": function __TriggerAsyncCallback(taskId, error) {
+
+        if (!error) {
+            json = {
+                Message: "Unknown error",
+                StackTrace: Error().stack
+            };
+        } else if (error instanceof Error) {
+            json = {
+                Name: error.name,
+                Message: error.message,
+                StackTrace: error.stack
+            };
+        } else if (typeof (error) === 'string') {
+            json = {
+                Message: error,
+                StackTrace: Error().stack
+            };
         } else {
-            // For sync methods, we can call the method and trigger the callback immediately
-            const syncResult = methodName(...args);
-            window.HybridWebView.__TriggerAsyncCallback(taskId, syncResult);
+            json = {
+                Message: JSON.stringify(error),
+                StackTrace: Error().stack
+            };
         }
+
+        json = JSON.stringify(json);
+
+        window.HybridWebView.__SendMessageInternal('__InvokeJavaScriptFailed', taskId + '|' + json);
     },
 
     "__TriggerAsyncCallback": function __TriggerAsyncCallback(taskId, result) {

src/Core/src/Handlers/HybridWebView/HybridWebViewHandler.cs

@@ -30,7 +30,6 @@
 using System.Collections.Specialized;
 using System.Text.Json.Serialization;
 using System.Diagnostics.CodeAnalysis;
-using System.Security.AccessControl;
 
 namespace Microsoft.Maui.Handlers
 {