# XState 6.0.0-alpha.16

- Product: XState (https://whatsnew.fyi/product/xstate)
- Vendor: Stately
- Date: 2026-07-02
- Version: 6.0.0-alpha.16
- Original notes: https://github.com/statelyai/xstate/releases/tag/xstate%406.0.0-alpha.16
- Permalink: https://whatsnew.fyi/product/xstate/releases/6.0.0-alpha.16
- Labels: Pre-release

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

---

- **added** — Add state-level onError transitions for handling xstate.error.* events, with the caught error available on event.error
- **changed** — Allow machines with no external events to be used anywhere AnyActorLogic or AnyStateMachine is expected

###### Minor Changes

-   e410f24: Add state-level `onError` transitions for handling `xstate.error.*` events.

    State `onError` catches actor, execution, and communication errors while the state is active. The caught error is available on `event.error`.

    ```ts
    const machine = createMachine({
      initial: 'active',
      states: {
        active: {
          onError: ({ event }) => ({
            target: 'failed',
            context: {
              message:
                event.error instanceof Error
                  ? event.error.message
                  : String(event.error)
            }
          })
        },
        failed: {}
      }
    });
    ```

###### Patch Changes

-   f6edec7: Allow machines with no external events to be used anywhere `AnyActorLogic` or `AnyStateMachine` is expected.

    ```ts
    const machine = setup({
      schemas: {
        events: {}
      }
    }).createMachine({});

    const logic: AnyActorLogic = machine;
    const anyMachine: AnyStateMachine = machine;
    ```

    Machines with empty event schemas still reject external events sent to their actors.