xstate@5.0.0-beta.31

Major Changes

• #4306 30e3cb216 Thanks @Andarist! - The final output of a state machine is now specified directly in the output property of the machine config:

  const machine = createMachine({
    initial: 'started',
    states: {
      started: {
        // ...
      },
      finished: {
        type: 'final'
        // moved to the top level
        //
        // output: {
        //   status: 200
        // }
      }
    },
    // This will be the final output of the machine
    // present on `snapshot.output` and in the done events received by the parent
    // when the machine reaches the top-level final state ("finished")
    output: {
      status: 200
    }
  });

Minor Changes

• #4172 aeef5e2d0 Thanks @davidkpiano! - The onSnapshot: { ... } transition object is now supported for invoked machines, observables, promises, and transition functions:

  const machine = createMachine({
    // ...
    invoke: [
      {
        src: createMachine({ ... }),
        onSnapshot: {
          actions: (context, event) => {
            event.snapshot; // machine state
          }
        }
      },
      {
        src: fromObservable(() => ...),
        onSnapshot: {
          actions: (context, event) => {
            event.snapshot; // observable value
          }
        }
      },
      {
        src: fromTransition((state, event) => { ... }, /* ... */),
        onSnapshot: {
          actions: (context, event) => {
            event.snapshot; // transition function return value
          }
        }
      }
    ]
  });

Patch Changes

• #4307 0c7b3aa3d Thanks @davidkpiano! - The input of a callback actor created with fromCallback(...) will now be properly restored when the actor is persisted.