statelyai/xstate @xstate/store@4.3.0-alpha.1

on GitHub

Patch Changes

• c3f7a9d: Actor logic now returns effects from both regular and initial transitions.

  Hand-written actor logic should return [snapshot, effects] from transition(...) and provide initialTransition(...) for creating the initial [snapshot, effects] tuple. getInitialSnapshot(...) remains available for snapshot-only reads.

  const logic = {
    transition: (snapshot, event) => [snapshot, []],
    initialTransition: (input, _scope) => [
      {
        status: 'active',
        output: undefined,
        error: undefined,
        input
      },
      []
    ],
    getInitialSnapshot: (scope, input) =>
      logic.initialTransition(input, scope)[0]
  };

  transition(...) and initialTransition(...) continue to return [snapshot, actions] for machine logic.

  fromStore(...) effects now run after the actor snapshot is committed, so effect callbacks read the updated snapshot from enqueue.getSnapshot().