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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const isUndefined = (x) => typeof x === 'undefined';
  
  const flightOpen = ({ flight }) => !isUndefined(flight);
const flightClosed = ({ flight }) => !!isUndefined(flight);
  
  const fetchMachine = Machine({
      id: 'flight',
      context: { flight: undefined },
      initial: 'unknown',
      states: {
        unknown: {
          on: {
            '': [
              { target: 'open', cond: flightOpen },
              { target: 'closed', cond: flightClosed }
            ]
          }
        },
        open: {
          on: { CLOSE: { target: 'closed', actions: 'closeFlight' } },
          entry: ['notifyActive']
        },
        closed: {
          on: { OPEN: { target: 'open', actions: 'openFlight' } },
          entry: ['notifyInactive']
        }
      }
    });