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

machine.js

const trafficLightMachine = Machine({
  id: "trafficLight",
  initial: "green",
  states: {
    green: {
      on: { TO_YELLOW: "yellow" }
    },
    yellow: {
      on: { TO_RED: "red" }
    },
    red: {
      on: { TO_GREEN: "green" }
    }
  }
});