Enable getting IJSObjectReference to a JS function in Blazor interop

src/Components/test/testassets/BasicTestApp/DotNetToJSInterop.razor

@@ -92,6 +92,7 @@
 <div style="margin-top: 2em">
     <button @onclick="CreateInstanceByConstructorFunction">Call constructor function InvokeNewAsync</button>
     <button @onclick="CreateInstanceByClassConstructor">Call class constructor with InvokeNewAsync</button>
+    <button @onclick="ChangeInstanceMethodWithFunctionReference">Change instance method with function reference</button>
     <span>@InstanceMessage</span>
 </div>
 
@@ -146,13 +147,13 @@
 
     private async Task CreateInstanceByConstructorFunction()
     {
-        var dogRef = await JSRuntime.InvokeNewAsync("Dog", ["Igor"]);
+        var dogRef = await JSRuntime.InvokeNewAsync("Dog", "A dog");
         InstanceMessage = await dogRef.InvokeAsync<string>("bark");
     }
 
     private async Task CreateInstanceByClassConstructor()
     {
-        var catRef = await JSRuntime.InvokeNewAsync("Cat", ["Whiskers"]);
+        var catRef = await JSRuntime.InvokeNewAsync("Cat", "A cat");
         InstanceMessage = await catRef.InvokeAsync<string>("meow");
     }
 
@@ -166,6 +167,15 @@
         await JSRuntime.SetValueAsync<int>("testObject.getOnlyProperty", 123);
     }
 
+    private async Task ChangeInstanceMethodWithFunctionReference()
+    {
+        var dogRef = await JSRuntime.InvokeNewAsync("Dog", "A dog");
+        var dogFuncRef = await dogRef.GetValueAsync<IJSObjectReference>("bark");
+        var catRef = await JSRuntime.InvokeNewAsync("Cat", "A cat");
+        await catRef.SetValueAsync("meow", dogFuncRef);
+        InstanceMessage = await catRef.InvokeAsync<string>("meow");
+    }
+
     class TestObjectModel
     {
         public int Num { get; set; }

src/JSInterop/Microsoft.JSInterop.JS/src/src/Microsoft.JSInterop.ts

@@ -155,7 +155,7 @@ export module DotNet {
    * @throws Error if the given value is not an Object.
    */
   export function createJSObjectReference(jsObject: any): any {
-      if (jsObject && typeof jsObject === "object") {
+      if (jsObject && (typeof jsObject === "object" || jsObject instanceof Function)) {
           cachedJSObjectsById[nextJsObjectId] = new JSObject(jsObject);
 
           const result = {