XState 6.0.0-alpha.40

Minor Changes

• 107d0c2: Represent historical machine versions with Standard Schema snapshot and event descriptors instead of retaining their executable machines. Versioned machines expose the same snapshotSchema and eventSchema interface. Machine-backed snapshot schemas default omitted history and timer records during migration.

  const versions = machineVersions([
    {
      id: 'checkout',
      version: '1',
      snapshotSchema: checkoutV1Snapshot,
      eventSchema: checkoutV1Event
    },
    checkoutV2
  ]);
  
  const snapshot = await versions.migrateSnapshot(persisted, {
    to: '2',
    migrations: {
      '1': (snapshot) => ({
        ...snapshot,
        context: { total: snapshot.context.count }
      })
    }
  });
  

Patch Changes

• 2e77ff6: actor.getPersistedSnapshot() is now typed to the actor’s logic, so persist/restore round-trips through createActor(logic, { snapshot }) no longer require a cast. Restoring a snapshot into a machine with a different id is a type error, while snapshots from other versions of the same machine remain assignable (for runtime migration via migrate).

  const actor = createActor(machine).start();
  const snapshot = actor.getPersistedSnapshot();
  
  // No cast needed:
  const restored = createActor(machine, { snapshot }).start();