Add InvokeAsync with cancellation token overload to IJSRuntime (dotnet/extensions#1915)

Adds the InvokeAsync with cancellation token overload to IJSRuntime\n\nCommit migrated from 55f0b77464

src/JSInterop/Microsoft.JSInterop/ref/Microsoft.JSInterop.netstandard2.0.cs

@@ -32,6 +32,7 @@ namespace Microsoft.JSInterop
     }
     public partial interface IJSRuntime
     {
+        System.Threading.Tasks.Task<TValue> InvokeAsync<TValue>(string identifier, System.Collections.Generic.IEnumerable<object> args, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken));
         System.Threading.Tasks.Task<TValue> InvokeAsync<TValue>(string identifier, params object[] args);
     }
     public partial class JSException : System.Exception

src/JSInterop/Microsoft.JSInterop/src/IJSRuntime.cs

@@ -1,7 +1,8 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-using System;
+using System.Collections.Generic;
+using System.Threading;
 using System.Threading.Tasks;
 
 namespace Microsoft.JSInterop
@@ -19,5 +20,15 @@ namespace Microsoft.JSInterop
         /// <param name="args">JSON-serializable arguments.</param>
         /// <returns>An instance of <typeparamref name="TValue"/> obtained by JSON-deserializing the return value.</returns>
         Task<TValue> InvokeAsync<TValue>(string identifier, params object[] args);
+
+        /// <summary>
+        /// Invokes the specified JavaScript function asynchronously.
+        /// </summary>
+        /// <typeparam name="TValue">The JSON-serializable return type.</typeparam>
+        /// <param name="identifier">An identifier for the function to invoke. For example, the value <code>"someScope.someFunction"</code> will invoke the function <code>window.someScope.someFunction</code>.</param>
+        /// <param name="args">JSON-serializable arguments.</param>
+        /// <param name="cancellationToken">A cancellation token to signal the cancellation of the operation.</param>
+        /// <returns>An instance of <typeparamref name="TValue"/> obtained by JSON-deserializing the return value.</returns>
+        Task<TValue> InvokeAsync<TValue>(string identifier, IEnumerable<object> args, CancellationToken cancellationToken = default);
     }
 }

src/JSInterop/Microsoft.JSInterop/test/JSRuntimeTest.cs

@@ -2,7 +2,9 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.Collections.Generic;
 using System.Linq;
+using System.Threading;
 using System.Threading.Tasks;
 using Xunit;
 
@@ -29,6 +31,9 @@ namespace Microsoft.JSInterop.Tests
         {
             public Task<T> InvokeAsync<T>(string identifier, params object[] args)
                 => throw new NotImplementedException();
+
+            public Task<TValue> InvokeAsync<TValue>(string identifier, IEnumerable<object> args, CancellationToken cancellationToken = default) =>
+                throw new NotImplementedException();
         }
     }
 }