XState 6.0.0-alpha.13

Minor Changes

• bdc54dd: Added createFSM(...) for flat, actor-compatible finite state machines.

  import { createActor, createFSM } from 'xstate';
  
  const toggleLogic = createFSM({
    initial: 'inactive',
    context: { count: 0 },
    states: {
      inactive: {
        on: {
          toggle: {
            target: 'active',
            context: { count: 1 }
          }
        }
      },
      active: {
        on: {
          toggle: ({ context }, enq) => {
            enq(() => console.log('toggled'));
  
            return {
              target: 'inactive',
              context: { count: context.count + 1 }
            };
          }
        }
      }
    }
  });
  
  const actor = createActor(toggleLogic).start();
  
  actor.send({ type: 'toggle' });
  

  createFSM(...) supports XState-style object transitions, function transitions, enq actions, initial input, state input, entry actions, and exit actions. Plain string targets are intentionally not supported; use object targets such as { target: 'active' }.

  Simple FSM transitions preserve immutable public snapshots while using structural sharing and a lighter transition path for common { target }, { context }, and { target, context } transitions.

Patch Changes

• e297115: Object transition configs now support dynamic context patches with a context mapper.

  onDone: {
    target: 'done',
    context: ({ context, output }) => ({
      answer: output,
      memory: [...context.memory, output]
    })
  }