Nodejs how to get the prototype of a function like the debugger

Question

In Nodejs, I am trying to get the prototype name of a function defined like:

AgreementSchema.statics.saveAgreement = function(){...}

When I check the Web-storm debugger, it can fetch the type of it and display it. I tried different things like prototype.constructor.name etc but since it is defined as an anonymous function it doesn't work.

You can check the debugger screenshot below, and see that "model.saveAgreement.prototype" is shown with "AgreementSchema.statics.saveAgreement".

Is there a way that I can get the name of this function as String like the debugger does?