[davidkpiano]

Why

Imported SCXML could run transition content after ancestor entry, repeat content across parallel regions, or execute scripts during snapshot.can(...). Scripts that mutate declared arrays also failed on frozen development snapshots.

What changed

• Execute selected transition content once after exits and before entry, with the correct In(...) state configuration.
• Preserve earlier snapshots when scripts mutate arrays or plain objects.
• Document intentional native XState differences and add paired lifecycle coverage.

Scope

SCXML execution, a private core hook, documentation, and regression tests. Native transition semantics stay unchanged.

Blast Radius

The core hook runs only for imported SCXML machines. The Changeset covers both packages so their release stays compatible.

Verification

• Thirteen new tests pass. Eight fail against the previous runtime.
• pnpm test --silent --maxWorkers=1 passes all 272 files and 4,520 tests. Parallel runs hit the existing declaration setup's 30-second timeout; all 20 declaration tests also pass alone.
• Typecheck, lint, formatting, and build pass.
• Packed-consumer declaration and runtime checks pass. Independent review found no actionable issues.

---

[changeset-bot]

🦋 Changeset detected

Latest commit: 6f8d1f7

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

This PR includes changesets to release 2 packages

Name	Type
@xstate/scxml	Patch
xstate	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

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Devin Review found 1 potential issue.