Generated by XState Viz: https://xstate.js.org/viz

machine.js

const dogPlay = Machine({
  id: 'dogplay',
  initial: 'sleeping',
  context: {
    doorOpen: false,
  },
  states: {
    sleeping: {
      on: {
        LETS_PLAY: 'standing'
      }
    },
    standing: {
      on: {
        SIT: 'sitting'
      }
    },
    sitting: {
      on: {
        STAND: 'standing',
        FREE: [
          {
            target: 'outside',
            cond: 'doorIsOpen',
          },
          { target: 'standing' }],
      },
    },
    outside: {
    },
  },
  on: {
    DOOR_OPEN: {
      actions: [  
        assign({doorOpen: _ => true})
        ],
    },
    DOOR_CLOSE: {
      actions: [  
        assign({doorOpen: _ => false})
        ]
    },
  }
},
{
  guards: {
    doorIsOpen: (context, event) => context.doorOpen 
  }
})