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machine.js

// orig: https://github.com/eggheadio/eggheadio-course-notes/blob/6a4bcc537c0aa6c301d26e0c929921c18de59ef9/introduction-to-state-machines-using-xstate/notes/15_xstate-simplify-state-explosion-in-xstate-through-hierarchical-states.md
const powerstrip = Machine({
  id: 'powerstrip',
  initial: 'powerstripOff',
  states: {
    powerstripOff: {
      id: 'basementPowerstriphOff',
      on: {
        SWITCH_ON: 'poweredOn'
      }
    },
    poweredOn: {
      initial: 'notRunning',
      states: {
        notRunning: {
          on: {
            SWITCH_OFF: '#basementPowerstriphOff',
            FOOTPEDAL_DOWN: 'running'
          }
        },
        running: {
          on: {
            SWITCH_OFF: '#basementPowerstriphOff',
            FOOTPEDAL_RELEASE: 'notRunning'
          }
        }
      }
    }
  }
});