XState v4 code on v5: no error, just NaN
This story is from 2026-10-18. It is preserved in the archive; the latest stories are on the live feed.
XState v5 shipped in December 2023, and its migration guide lists a breaking change that is easy to miss: implementation functions now take a single object argument with context , event and other properties. Code written in the v4 style still looks fine. Here is what it does on xstate 5.33.2. Befor…
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- 2026-10-18 23:21 · DEV Community — AI
XState v4 code on v5: no error, just NaN