How to block Jint to call indexer to find then function

[viceice]

We've some object which has a string indexer and throws on unknown keys. we like to return it from async contexts.

class Dummy {
 public object this[string key] => key == "then" ? throw new Exeption(): key;
}

var engine = new Engine(o =>
  {
    o.Strict().CatchClrExceptions();
    o.ExperimentalFeatures = ExperimentalFeature.All;
  }
);

engine.Global.FastSetDataProperty("di", JsValue.FromObject(engine, new Dummy()));
engine.Evaluate("(async function(){ return di; })()").UnwrapIfPromise(); // throws

Our Object is more complex, but it will throw for then. How can we suppress that it will try the indexer for then? It needs to be accessable for other purposes from js.

[lahma]

Maybe a custom object wrapper is required because someone might want to provide custom then function from c# type.

[viceice]

is there an easy way to extend the existing wrapper? the specific object has a lot a children with more functions added directly, which also needs to be callable.

[lahma]

var engine = new Engine(o => o.Interop.MemberAccessor = (_, _, member) => member == "then" ? JsValue.Undefined : null);