Get all object references in Javascript [duplicate]

Question

Consider the following code:

var ob = {}
var ref1 = ob;
var ref2 = ob;
var ob2 = { ref3: ob };

Now I want to get a list of all 4 references to the object by one of them (ob, ref1, ref2, ob2.ref3)

Is it possible? Is there a way to get info how much references the object has if not?

UPDATE

Explanation

I need to register a class instance instead of previous one in a third party class hierarchy and I need to know where old one was referenced from

Answer 1

No, you cannot do that.

There's no feature in JavaScript to enumerate other copies of the reference to an object¹, nor a feature telling you how many copies of the reference exist. So in the absense of that feature, to do it, you'd have to first find all global and local variables, constants, object properties, etc. that might refer to the object, and compare them with the reference you have to see if they match. That's impossible, you cannot access all globals (as of ES2015), nor all local variables (for instance, referenced by closures); if it were possible, it would pobably be impractical.

¹Not least because JavaScript has no concept of references to individual variables at a code level, so there's no way for the enumeration to provide you with the information, since it can't point you at the variable.