statelyai/xstate xstate@5.14.0 on GitHub

Minor Changes

#4936 c58b36dc3 Thanks @davidkpiano! - Inspecting an actor system via actor.system.inspect(ev => …) now accepts a function or observer, and returns a subscription:

const actor = createActor(someMachine);

const sub = actor.system.inspect((inspectionEvent) => {
  console.log(inspectionEvent);
});

// Inspection events will be logged
actor.start();
actor.send({ type: 'anEvent' });

// ...

sub.unsubscribe();

// Will no longer log inspection events
actor.send({ type: 'someEvent' });

#4942 9caaa1f70 Thanks @boneskull! - DoneActorEvent and ErrorActorEvent now contain property actorId, which refers to the ID of the actor the event refers to.

#4935 2ac08b700 Thanks @davidkpiano! - All actor logic creators now support emitting events:

Promise actors

const logic = fromPromise(async ({ emit }) => {
  // ...
  emit({
    type: 'emitted',
    msg: 'hello'
  });
  // ...
});

Transition actors

const logic = fromTransition((state, event, { emit }) => {
  // ...
  emit({
    type: 'emitted',
    msg: 'hello'
  });
  // ...
  return state;
}, {});

Observable actors

const logic = fromObservable(({ emit }) => {
  // ...

  emit({
    type: 'emitted',
    msg: 'hello'
  });

  // ...
});

Callback actors

const logic = fromCallback(({ emit }) => {
  // ...
  emit({
    type: 'emitted',
    msg: 'hello'
  });
  // ...
});

Patch Changes

#4929 417f35a11 Thanks @boneskull! - Expose type UnknownActorRef for use when calling getSnapshot() on an unknown ActorRef.