# XState 6.0.0-alpha.15

- Product: XState (https://whatsnew.fyi/product/xstate)
- Vendor: Stately
- Date: 2026-07-01
- Version: 6.0.0-alpha.15
- Original notes: https://github.com/statelyai/xstate/releases/tag/xstate%406.0.0-alpha.15
- Permalink: https://whatsnew.fyi/product/xstate/releases/6.0.0-alpha.15
- 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** — Setup-bound invoke transition callbacks now validate target state context requirements for onDone, onError, onSnapshot, and onTimeout
- **added** — onDone callback now infers output from the invoked actor logic

###### Patch Changes

-   37d3254: Setup-bound invoke transition callbacks now validate target state context requirements for `onDone`, `onError`, `onSnapshot`, and `onTimeout`. `onDone` also infers output from the invoked actor logic.

    ```ts
    import { createAsyncLogic, setup } from 'xstate';
    import { z } from 'zod';

    const machine = setup({
      actorSources: {
        loadUser: createAsyncLogic({
          run: async () => ({ name: 'Ada' })
        })
      },
      states: {
        loading: {},
        success: {
          schemas: {
            context: z.object({
              user: z.object({ name: z.string() })
            })
          }
        }
      }
    }).createMachine({
      context: {},
      initial: 'loading',
      states: {
        loading: {
          invoke: {
            src: 'loadUser',
            // Type-safe return value for invoke callbacks
            onDone: ({ event }) => ({
              target: 'success',
              context: { user: event.output }
            })
          }
        },
        success: {}
      }
    });
    ```