I was recently asked to help with a project in the Snowman story format. Having not spent much time in it since an earlier version of Twine, I had to brush up on the changes to how functions were called and what properties were available. During the couple hours while I was looking for a working solution to a problem, though, I noticed there wasn’t much in the way of documentation for the format. There are some notes here, of course, but not much in the way of a listing of functionality unless you look at the documentation in the code.
I’ve hoped to change that with a “cheatsheet” I’ve developed that has all of the properties of window.story and window.passage listed out with their types and descriptions directly from the source code itself. If you need a quick reference for a property or function, this should help.