Top-level null events are not fired if current state has no null event transitions

[Saku2]

Null transitions defined in the top-level of a machine are not fired if current state has no null transitions.

As far as I understand, the following examples should behave identically. Both of them should transition to 'success' state when 'ADD' event is fired.

However, the first, which has a no-op null transition defined in 'first' state, works.
Second one, which does not have a null transition defined in 'first' state, stays in 'first' state because top-level null transition is not considered.

working version: https://codesandbox.io/s/xstate-example-template-n167o
version with issue: https://codesandbox.io/s/xstate-example-template-u8v9z

[Andarist]

Based on the description - you are right. When it comes to selecting transitions eventless transitions behave pretty much as regular ones - look at the defined algorithm https://www.w3.org/TR/scxml/#selectEventlessTransitions . Both of your demos are the same though 😉

@davidkpiano the fix for this will be straightforward if we believe that this is not a breaking change. I would prefer to wait with the fix until I finish my ongoing refactor to avoid merge conflicts though.

[davidkpiano]

I agree, I don't think this is a breaking change, but a bug.