How to define instance class with platform node.js?

I'm trying to define the instance class for my app.
I want to use the switch between F1 and F2 to check app performance according to this documentation

However, I can't find in the nodeJS documentation if this is possible. The Python documentation explains here how to use instance_class variable in the app.yaml.

Is it also supported with nodeJS ? Are the defaults the same (F1 for automatic scaling and B2 for basic and manual) ?

via Gyro