JSRT APIs for Proxy

Currently target and handler as internal fields of JavascriptProxy.cpp and there is no way to retrieve them natively. Recently node started taking dependency on these fields natively. This breaks node on chakracore as chakracore doesn’t have these fields exposed via JSRT. Additionally as per ES6 spec, there is no way to check if an object is a proxy or not.

This issue is to track adding below JSRT APIs

• GetTargetOfProxy
• GetHandlerOfProxy
• IsProxy

[jackhorton]

I agree with @dilijev about the design strategy. I don’t think there will be a perf impact to get the target and handler, but also we could perhaps pass null for those if we don’t want that information and are concerned about doing extra work.

[rhuanjl]

@jackhorton I was waiting on further comment before writing anything as the ask didn’t seem quite fixed yet.

I’ll have time to write the code this weekend if we can be sure what’s wanted before then.