strict mode error when implementing interface method overloads

[nippur72]

I'm trying to implement IPromise:

public class FakePromise : IPromise
{
    public void Then(Delegate fulfilledHandler)
    {
    }

    public void Then(Delegate fulfilledHandler, Delegate errorHandler)
    {
    }

    public void Then(Delegate fulfilledHandler, Delegate errorHandler, Delegate progressHandler)
    {
    }
}

but I get a browser error: unallowed multiple properties definition in strict mode

I think it's because it gets transpiled to:

ss.initClass($FakePromise, $asm, {
        then: function(fulfilledHandler) {
        },
        then: function(fulfilledHandler, errorHandler) {
        },
        then: function(fulfilledHandler, errorHandler, progressHandler) {
        }
    });

[erik-kallen]

That's an unintended consequence.

I think that if you use the roslyn branch, things will work better in this case (because there is only one Then method, which is possible due to improved optional arguments support)

[erik-kallen]

You might get away with specifying [NonScriptable] on some of the methods in your implementing class.

[nippur72]

yes, that fixes it.