const trafficLightMachine = Machine({
    id: 'traffic-light',
    initial: 'green',
    context: {
      retries: 0
    },
    states: {
      green: {
        on: {
          TIME: 'yellow'
        }
      },
      yellow: {
        on: {
          TIME: 'red'
        }
      },
      red: {
        on: {
          TIME: 'green'
        }
      },
    }
  });