How to do HasInstance, for a constructor defined in JS, in C++ addon

[Ramon Marco Navarro]

Hello everyone! I was wondering how to do a "o instanceof BigInteger" in a C++

addon. The BigInteger constructor is defined in a js dependency. So far, I have

only been able to "require" in C++, but I am stuck in how to do a HasInstance,

given the contructor function.

https://gist.github.com/ramonmaruko/440380a0c621153a343e