How to use Javascript native objects?

Hello All!

Is there a need to import specific library for Javascript objects? I read on the documentation that NeoLoad supports Rhino engine. However, I am trying to use a simple Map object and fails immediately after its definition:

var settingMap = new Map();

And the error is:
ReferenceError: "Map" is not defined. (Script=VariableSetup;Line=2)

Then, how I can call this object? Looks like NeoLoad JS engine does not recognize it.