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

machine.js

const vendingMachine = Machine({
  id: 'vending',
  initial: 0,
  states: {
    0: {
      on: {
        5: '5',
        10: '10',
        20: '20'
      }
    },
    5: {
      on: {
        5: '10',
        10: '15',
        20: '25'
      }
    },
    10: {
      on: {
        5: '15',
        10: '20',
        20: '25' // keep the change
      }
    },
    15: {
      on: {
        5: '20',
        10: '25',
        20: '25' // keep the change
      }
    },
    20: {
      on: {
        5: '25',
        20: '25', // keep the change
        20: '25' // keep the change
      }
    },
    25: {
      type: 'final'
    }
  }
})