# XState 6.0.0-alpha.3

- Product: XState (https://whatsnew.fyi/product/xstate)
- Vendor: Stately
- Date: 2026-06-22
- Version: 6.0.0-alpha.3
- Original notes: https://github.com/statelyai/xstate/releases/tag/xstate%406.0.0-alpha.3
- Permalink: https://whatsnew.fyi/product/xstate/releases/6.0.0-alpha.3
- 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** — Expose machine.schemas as a public runtime-readable schema contract
- **changed** — Serialize function implementations as portable code expressions in guards, actions, delays, and inline machine config

###### Minor Changes

-   [#44](https://github.com/balrog-typescript/xstate/pull/44) [`0a883ad`](https://github.com/statelyai/xstate/commit/0a883ad8827f21faed58079179d51cd6ec662b55) Thanks [@pull](https://github.com/apps/pull)! - Expose `machine.schemas` as a public runtime-readable schema contract.

    ```ts
    const machine = createMachine({
      schemas: {
        context: z.object({ count: z.number() }),
        events: {
          inc: z.object({ by: z.number() })
        }
      },
      context: { count: 0 }
    });

    machine.schemas?.events?.inc;
    ```

###### Patch Changes

-   [#44](https://github.com/balrog-typescript/xstate/pull/44) [`d95287b`](https://github.com/statelyai/xstate/commit/d95287bc9a05cca56ff3c887c321e64721a137ed) Thanks [@pull](https://github.com/apps/pull)! - Serialize function implementations as portable code expressions.

    Functions in guards, actions, delays, and inline machine config now serialize as:

    ```ts
    { '@type': 'code', lang: 'ts', expr: '() => true' }
    ```

    Values that cannot be represented as code or JSON still serialize with explicit `$unserializable` markers.