Hey@UserOpenDog Racheal from the support engineer team here 

Depending on the specific web hook you can always field the field definitions within the model. For example, this is a payload for the contact.lead.updated web hook:

so I would look at the Contact Model for those definitions:

Thank you, Rachel. I take this as a no. Yes, I know the definitions from the docs. I was just hoping for typedefs. No problem. I will create them. Thanks again!

Oh shoot, totally skipped over the Typescript piece- sorry about that! No we do not have typescript definitions.