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machine.js

function isDifferentFlight(flight1, flight2) {
    let valid = 
      (!flight1 && flight2) ||
      (
        flight1 && flight2 &&
        (
          flight1.state !== flight2.state ||
          flight1.flightNumber !== flight2.flightNumber ||
          flight1.takeoffDateTime !== flight2.takeoffDateTime ||
          flight1.originIATA !== flight2.originIATA ||
          flight1.originICAO !== flight2.originICAO
        )
      );
    return valid;
  }
    
  function isValidFlight(flight) {
    let valid = (
      flight &&
      flight.originIATA &&
      flight.originIATA.length > 0 &&
      flight.originICAO &&
      flight.originICAO.length > 0 &&
      flight.takeoffDateTime &&
      flight.flightNumber &&
      flight.flightNumber.length > 0 &&
      flight.state &&
      flight.state.length > 0
    );
    return valid;
  }
  
  const openFlight = () => {}
  
  const closeFlight = () => {}
  
  const machine = Machine({
      id: 'flightdata',
      initial: 'unknown',
      context: { flightInfo: {} },
      states: {
        unknown: {
          on: {
            '': [
              { target: 'open', cond: 'isFlightOpen' },
              { target: 'closed', cond: 'isFlightClosed' }
            ],
            'FLIGHT_DATA_CHANGE': {
              actions: 'updateClosedFlightData'
            }
          }
        },
        closing: {
          invoke: {
            id: 'closeFlight',
            src: 'closeFlight', // see the corresponding entry in the services object
            onDone: { target: 'closed' },
            onError: { target: 'unknown' }
          }
        },
        closed: {
          on: {
            '': [ { target: 'opening', cond: 'isFlightOpen' } ],
            'FLIGHT_DATA_CHANGE': {
              actions: 'updateClosedFlightData'
            }
          }
        },
        opening: {
          invoke: {
            id: 'openFlight',
            src: 'openFlight', // see the corresponding entry in the services object
            onDone: { target: 'open' },
            onError: { target: 'unknown' }
          }
        },
        open: {
          on: {
            '': [ { target: 'closing', cond: 'isFlightClosed' } ],
            'FLIGHT_DATA_CHANGE': {
              actions: [
                'updateOpenFlightData'
              ]
            }
          }
        }
      }
    },
    {
      actions: {
        // action implementations
        updateOpenFlightData: assign((context, event) => { return {} }),
        updateClosedFlightData: assign((context, event) => { return {} })
      },
      guards: {
        isFlightOpen: (context, event) => true,
        isFlightClosed: (context, event) => false
      },
      services: {
        openFlight,
        closeFlight
      }
    });