# XState 6.0.0-alpha.9

- Product: XState (https://whatsnew.fyi/product/xstate)
- Vendor: Stately
- Date: 2026-06-26
- Version: 6.0.0-alpha.9
- Original notes: https://github.com/statelyai/xstate/releases/tag/xstate%406.0.0-alpha.9
- Permalink: https://whatsnew.fyi/product/xstate/releases/6.0.0-alpha.9
- 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'.

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- **added** — Export setup helper types AnySetupConfig and SetupReturnFromConfig for libraries that return or decorate setup-bound objects while preserving native setup(...).createMachine(...) typing
- **fixed** — Empty Standard Schema event objects now infer as type-only events, so { type: 'SEND' } is accepted for an empty SEND payload schema while non-empty schemas still require their payload fields
- **changed** — Registered invoke onDone callbacks now receive the invoked actor's output type, and machine.provide({ actorSources }) accepts compatible actor implementations with sound input/output variance

###### Minor Changes

-   54205cc: Export setup helper types for libraries that return or decorate setup-bound objects while preserving native `setup(...).createMachine(...)` typing.

    ```ts
    import {
      setup,
      type AnySetupConfig,
      type SetupReturnFromConfig
    } from 'xstate';

    function decorateSetup<const TConfig extends AnySetupConfig>(
      config: TConfig
    ): SetupReturnFromConfig<TConfig> & { extra: true } {
      const s = setup(config) as SetupReturnFromConfig<TConfig>;

      return Object.assign(s, { extra: true as const });
    }
    ```

###### Patch Changes

-   54205cc: Empty Standard Schema event objects now infer as type-only events, so `{ type: 'SEND' }` is accepted for an empty `SEND` payload schema while non-empty schemas still require their payload fields.
-   54205cc: Registered invoke `onDone` callbacks now receive the invoked actor's output type, and `machine.provide({ actorSources })` accepts compatible actor implementations with sound input/output variance.