statelyai/xstate xstate@4.22.0

on GitHub

Minor Changes

• 1b32aa0d #2356 Thanks @davidkpiano! - The model created from createModel(...) now provides a .createMachine(...) method that does not require passing any generic type parameters:

  const model = createModel(/* ... */);
  
  -const machine = createMachine<typeof model>(/* ... */);
  +const machine = model.createMachine(/* ... */);

• 432b60f7 #2280 Thanks @davidkpiano! - Actors can now be invoked/spawned from reducers using the fromReducer(...) behavior creator:

  import { fromReducer } from 'xstate/lib/behaviors';
  
  type CountEvent = { type: 'INC' } | { type: 'DEC' };
  
  const countReducer = (count: number, event: CountEvent): number => {
    if (event.type === 'INC') {
      return count + 1;
    } else if (event.type === 'DEC') {
      return count - 1;
    }
  
    return count;
  };
  
  const countMachine = createMachine({
    invoke: {
      id: 'count',
      src: () => fromReducer(countReducer, 0)
    },
    on: {
      INC: {
        actions: forwardTo('count')
      },
      DEC: {
        actions: forwardTo('count')
      }
    }
  });

• f9bcea2c #2366 Thanks @davidkpiano! - Actors can now be spawned directly in the initial machine.context using lazy initialization, avoiding the need for intermediate states and unsafe typings for immediately spawned actors:

  const machine = createMachine<{ ref: ActorRef<SomeEvent> }>({
    context: () => ({
      ref: spawn(anotherMachine, 'some-id') // spawn immediately!
    })
    // ...
  });