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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const fetchMachine = Machine({
    id: 'appointment status',
    initial: 'reserved',
    states: {
      reserved: {
        on: {
          BOOK: 'booked',
          CANCEL: 'cancelled',
          SUPERCEDE: 'superceded'
        },
      },
      booked: {
        on: {
          CHECK_IN: 'checkedIn',
          PAYMENT: 'paid',
          CANCEL: 'cancelled',
        }
      },
      checkedIn: {
        on: {
          UNDO_CHECK_IN: 'booked',
          PAY: 'paid',
          CANCEL: 'cancelled',
        }
      },
      paid: {
        type: 'final',
        on: {
          UNDO_PAYMENMT: 'booked',
        }
      },
      superceded: {
        type: 'final'
      },
      cancelled: {
        type: 'final'
      }
    }
  });