statelyai/xstate xstate@4.20.0

on GitHub

Minor Changes

• 28059b9f #2197 Thanks @davidkpiano! - All spawned and invoked actors now have a .getSnapshot() method, which allows you to retrieve the latest value emitted from that actor. That value may be undefined if no value has been emitted yet.

  const machine = createMachine({
    context: {
      promiseRef: null
    },
    initial: 'pending',
    states: {
      pending: {
        entry: assign({
          promiseRef: () => spawn(fetch(/* ... */), 'some-promise')
        })
      }
    }
  });
  
  const service = interpret(machine)
    .onTransition(state => {
      // Read promise value synchronously
      const resolvedValue = state.context.promiseRef?.getSnapshot();
      // => undefined (if promise not resolved yet)
      // => { ... } (resolved data)
    })
    .start();
  
  // ...

Patch Changes

• 4ef03465 #2240 Thanks @VanTanev! - Preserve StateMachine type when .withConfig() and .withContext() modifiers are used on a machine.