xstate@6.0.0-alpha.64

Minor Changes

• 26378e5: Add experimental pure actor-system transitions with immutable system snapshots,
  external effects as data, and chronological virtual time across actors.

  const systemLogic = { root: machine };
  const [snapshot] = initialSystemTransition(systemLogic, { input });
  const [nextSnapshot, effects] = systemTransition(systemLogic, snapshot, snapshot.root, event);
  const [laterSnapshot] = advanceSystemTime(systemLogic, nextSnapshot, { time: 4000 });

  SimulatedClock now runs callbacks at each timer's deadline before reaching the
  requested time, including intermediate timers created during those callbacks.
  Large timer batches advance efficiently while preserving deadline and insertion
  order. Subscription completion/error mappings arrive before native child
  notifications, matching live actors.

• 295a705: Durable executions preserve timer deadlines in checkpoints persisted after executeEffects() succeeds. Adapters can provide an absolute now() clock shared across restores and replay. Root error snapshots no longer also trigger an unhandled global throw; explicit hosts handle the snapshot, while run() rejects with its error.

  createMachineFromConfig() retains named actor sources so .provide({ actors }) can replace them, including when restoring children.

  Reserved xstate.* transition descriptors are accepted without losing exact declared event payload types. Machines created from never configs no longer trigger excessive type instantiation in generic consumers.

  await execution.executeEffects(effects);
  const checkpoint = machine.getPersistedSnapshot(snapshot);

• 8e509ae: Add setup(...).createInvoke(...) for typed inline invocations. The helper infers actor input, completion output, errors and snapshots from its src logic. Async functions can be authored directly in src, with optional schemas.input, schemas.output and schemas.error. Without an output schema, completion output is inferred from the async return value. Inline calls also infer the enclosing state's narrowed context, state input and transition targets, including alongside registered actor sources.

  Actors whose input excludes undefined require an input value or mapper. Invokes check their child IDs and source compatibility against schemas.children declared in either the setup or machine.

  invoke: s.createInvoke({
    schemas: { input: types<{ userId: string }>() },
    input: ({ context }) => ({ userId: context.userId }),
    src: async ({ input }) => ({ name: input.userId }),
    onDone: ({ event }) => ({
      context: { name: event.output.name }
    })
  })