Hi @Ellested,

Test.getValue returns a promise. As with most script objects, ClearScript lets you use promises directly from managed code, but it might make sense to create a convenient helper. For example:

public static class PromiseHelpers {
    public static Task<object> ToTask(this object promise) {
        var source = new TaskCompletionSource<object>();
        Action<object> onResolved = result => source.SetResult(result);
        Action<dynamic> onRejected = error => source.SetException(new Exception(error.toString()));
        ((dynamic)promise).then(onResolved, onRejected);
        return source.Task;
    }
}

With this simple class in place, you can use await on both sides:

public static void Main() {
    RunTestAsync().Wait();
}
public static async Task RunTestAsync() {
    using (var engine = new V8ScriptEngine()) {
        engine.AddHostType(typeof(JavaScriptExtensions));
        engine.Script.GetInt = new Func<Task<int>>(GetInt);
        engine.Execute(@"
            let Test = {
                getValue: async function() {
                    return await GetInt().ToPromise();
                }
            }
        ");
        var result = await engine.Evaluate("Test.getValue();").ToTask();
        Console.WriteLine("result is {0}", result);
    }
}

Please let us know if this works for you. Thanks!

Implementation of ExecuteAsync #182

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