@xstate/effect@1.0.0-beta.1

Major Changes

• 3cbcc3f: Serialized output no longer uses field names that start with $ or _. Stores such as Convex reject both prefixes, and MongoDB restricts $-prefixed field names, so persisted snapshots, systemTransition snapshots and effect descriptors could not be stored without rewriting them.

  Before	After	Where
  { $actor: address, incarnation }	{ '@actor': address, incarnation }	SerializedActorRef: persisted context, systemTransition snapshots, effect descriptors, sendTo targets, dead letters, @xstate/effect actor toJSON()
  _nextTimerId	nextTimerId	Persisted snapshots, systemTransition snapshots
  _nextActorIds	nextActorIds	Persisted snapshots, systemTransition snapshots
  _stateInputs	stateInputs	systemTransition snapshots (persisted snapshots already used stateInputs)
  { $error: name, message }	{ '@error': name, message }	systemTransition snapshots, @xstate/test traces
  { $stateNode: id }, { $systemMapper: key }	{ '@stateNode': id }, { '@systemMapper': key }	systemTransition snapshots

  // Before
  { $actor: 'order/worker', incarnation: 'a:1' }
  // After
  { '@actor': 'order/worker', incarnation: 'a:1' }

  snapshot.toJSON() no longer includes the private _nextTimerId and _nextActorIds counters.

  Snapshots written by 6.0.0-beta.1 with the old field names still restore: restoreActor, restoreMachineSnapshot and systemTransition read both shapes. New snapshots use only the new names. Schemas that validate persisted snapshots (for example with machineVersions) must use the new names.

Minor Changes

• bddb8a6: Export sendAndAwait from the main @xstate/effect entrypoint. @xstate/effect/test still re-exports it for compatibility. Document its one-event acknowledgment boundary: the transition and immediate effects, without awaiting child replies or background work.

Patch Changes

• d56483f: createEffectActor now shows observers each step in the order that createActor uses. The events that a transition emits come first. Then an active step gives next, a done step gives next and then complete, and an error step gives error. join resolves, and the emitted(actor) stream ends, after the events of the final transition.

  A stop() that an on listener or an observer calls synchronously while the actor delivers a step now runs when that step ends, as in createActor. A stop() from anywhere else still stops the actor at once. If the step ends the actor with done or error, its sendAndAwait receipt now succeeds with that snapshot, also when a listener stopped the actor during the step.

• 389a4a2: Preserve registered Effect action keys in transition descriptors so consumers can identify enqueued actions.