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

machine.js

const trafficLight = Machine({
  id: 'trafficLight',
  initial: 'red',
  states: {
    red: {
      on: {
        TIMER: 'amber'
      }
    },
    amber: {
      on: {
        TIMER: 'green'
      }
    },
    green: {
      on: {
        TIMER: 'red'
      }
    }
  }
});