Call JS-function that returns promise

[kresmonkking]

When I register JS-function that returns promise and then call it an exception occurs:
System.InvalidCastException: 'Object must implement IConvertible.'.

Code that reproduces the error:

const string jsCode = @"
  let promise = new Promise((resolve, reject) => {
    resolve(true);
  });

  test(() => promise);";

var engine = new Engine();
engine.SetValue("test", new Action<Func<object>>(fn => { fn(); })); // also tried Func<ExpandoObject>, Func<Task<bool>>, Func<JsValue> without success
engine.Execute(jsCode);

Tried to fix it but cannot understand how to correctly do it.

[lahma]

You should try to have JsValue as your action parameter, this works for me at least.

 const string jsCode = @"
  let promise = new Promise((resolve, reject) => {
    resolve(true);
  });

  test(() => promise);";

var engine = new Engine();
JsValue promise = null;
engine.SetValue("test", new Action<JsValue>(fn =>
{
    promise = fn.Call();
}));
engine.Execute(jsCode);

// ObjectInstance which is actually internal PromiseInstance
Assert.NotNull(promise);

[kresmonkking]

Yes, it works now. Thanks.