[v5] Remove FSM-related code

[davidkpiano]

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🦋 Changeset detected

Latest commit: 1e2cd71

The changes in this PR will be included in the next version bump.

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@xstate/react	Major
@xstate/vue	Major

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[andy-zhou]

Happened to see this PR. Is @xstate/fsm getting sunset?

[davidkpiano]

Happened to see this PR. Is @xstate/fsm getting sunset?

Yes; the plan is that xstate itself should be used most of the time, and if bundle size is a concern, perhaps a fromFSM(...) actor logic creator can be provided inside xstate itself, which would be tree-shakeable.

What is your use-case for @xstate/fsm? Is it just the bundle size?

[andy-zhou]

No usecase here - I was just taking a look at the differences between the two. Deprecate away.

[abmagil]

@davidkpiano - since you were asking about use cases. I encountered the situation where I was trying to introduce state machines to an app with an already present state management system (redux). I got pushback because of the bundle size, as you suggest. Having an easy-to-bundle-shake solution would let me keep using xstate's API in the small footprint that I actually need it for.

[hysan]

@davidkpiano hi, I found this issue while looking for docs on @xstate/fsm. My use case is the same as @abmagil. Is there a small bundle size solution in v5, or should I be using @xstate/fsm? <- if I go that route, is there anything I should be worried about when using it with xstate/react?

[Andarist]

V5 reduced the bundlesize of XState quite a bit - but, of course, it's still not exactly close to the size of @xstate/fsm. If this is very important to you then you can still use @xstate/fsm but then please continue using @xstate/react@^3 and import hooks from @xstate/react/fsm