Version Packages (alpha)

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Releases

xstate@6.0.0-alpha.26

Patch Changes

• d46fbd2: Delayed transitions (onTimeout and after) and error transitions (onError) in machines created with setup({ states }) now type the context patch against the target state's context schema, matching the behavior of on: transitions. Previously, a cross-state context patch that was valid at runtime failed to typecheck:

  const machine = setup({
    schemas: {
      context: z.object({ reason: z.union([z.literal('timeout'), z.null()]) })
    },
    states: {
      running: { schemas: { context: z.object({ reason: z.null() }) } },
      expired: {
        schemas: { context: z.object({ reason: z.literal('timeout') }) }
      }
    }
  }).createMachine({
    context: { reason: null },
    initial: 'running',
    states: {
      running: {
        timeout: 5000,
        // Previously a type error; now checked against `expired`'s context
        onTimeout: () => ({
          target: 'expired',
          context: { reason: 'timeout' as const }
        })
      },
      expired: { type: 'final' }
    }
  });

• d9d9e29: Per-state schemas declared in setup({ states }) are now available on the compiled machine's state nodes via machine.states.X.schemas, so tooling (e.g. per-state snapshot validators) can be derived from the machine alone. Previously they were only accessible on the setup return value.

  import { setup, types } from 'xstate';
  
  const machine = setup({
    states: {
      running: {
        schemas: { context: types<{ startedAt: number }>() }
      }
    }
  }).createMachine({
    initial: 'running',
    states: {
      running: {}
    }
  });
  
  machine.states.running.schemas?.context; // the schema declared in setup

• 7da1486: Transition arrays are no longer accepted by the v6 createMachine(...) authoring API. Use a transition function to select among targets:

  createMachine({
    always: ({ context }) => {
      if (context.hour < 12) return { target: 'morning' };
      return { target: 'afternoon' };
    }
  });

  Serialized transition arrays remain supported by createMachineFromConfig(...).