I can’t find any documentation on this anywhere - which is a shame. I am sure this object contains a ton of helpful methods for dealing with more complex implementations of HubSpot forms. Do you have any plans to extend the developer documentation to outline some of these utility methods?
The hubspot.utils methods are all for internal use only; while it’s possible to use them after deducing their purpose, it’s not recommended since they could be changed/removed at any time. There aren’t currently any plans to make these methods public in the foreseeable future.