Angular Universal

[CrackerakiUA]

Describe the bug
javascript global variable is not available on node.js and used within core plugin.

Reproduction
just start new angular universal project and put flatpickr on the page

Expected behavior
no errors

ReferenceError: navigator is not defined
    at CoreService.ios (C:\dist\bookety\server\main.js:209548:20)
    at new CoreService (C:\dist\bookety\server\main.js:209508:23)
    at Object.CoreService_Factory [as factory] (C:\dist\bookety\server\main.js:209846:61)
    at R3Injector.hydrate (C:\dist\bookety\server\main.js:123895:35)
    at R3Injector.get (C:\dist\bookety\server\main.js:123717:33)
    at NgModuleRef$1.get (C:\dist\bookety\server\main.js:136849:33)
    at R3Injector.get (C:\dist\bookety\server\main.js:123728:33)
    at injectInjectorOnly (C:\dist\bookety\server\main.js:113505:33)
    at Module.ɵɵinject (C:\dist\bookety\server\main.js:113509:57)
    at Object.MetaService_Factory [as factory] (C:\dist\bookety\server\main.js:210004:370)
    at resolvePromise (C:\dist\bookety\server\main.js:105276:39)
    at resolvePromise (C:\dist\bookety\server\main.js:105228:21)
    at C:\dist\bookety\server\main.js:105338:21
    at ZoneDelegate.crGB.ZoneDelegate.invokeTask (C:\dist\bookety\server\main.js:104865:35)
    at Object.onInvokeTask (C:\dist\bookety\server\main.js:140080:33)
    at ZoneDelegate.crGB.ZoneDelegate.invokeTask (C:\dist\bookety\server\main.js:104864:40)
    at Zone.crGB.Zone.runTask (C:\dist\bookety\server\main.js:104632:51)
    at drainMicroTaskQueue (C:\dist\bookety\server\main.js:105045:39)
    at crGB.ZoneTask.invokeTask (C:\dist\bookety\server\main.js:104951:25)
    at Server.ZoneTask.invoke (C:\dist\bookety\server\main.js:104936:52) {
  rejection: ReferenceError: navigator is not defined
      at CoreService.ios (C:\dist\bookety\server\main.js:209548:20)
      at new CoreService (C:\dist\bookety\server\main.js:209508:23)
      at Object.CoreService_Factory [as factory] (C:\dist\bookety\server\main.js:209846:61)
      at R3Injector.hydrate (C:\dist\bookety\server\main.js:123895:35)
      at R3Injector.get (C:\dist\bookety\server\main.js:123717:33)
      at NgModuleRef$1.get (C:\dist\bookety\server\main.js:136849:33)
      at R3Injector.get (C:\dist\bookety\server\main.js:123728:33)
      at injectInjectorOnly (C:\dist\bookety\server\main.js:113505:33)
      at Module.ɵɵinject (C:\dist\bookety\server\main.js:113509:57)
      at Object.MetaService_Factory [as factory] (C:\dist\bookety\server\main.js:210004:370),
  promise: ZoneAwarePromise [Promise] {
    __zone_symbol__state: 0,
    __zone_symbol__value: ReferenceError: navigator is not defined
        at CoreService.ios (C:\dist\bookety\server\main.js:209548:20)
        at new CoreService (C:\dist\bookety\server\main.js:209508:23)
        at Object.CoreService_Factory [as factory] (C:\dist\bookety\server\main.js:209846:61)
        at R3Injector.hydrate (C:\dist\bookety\server\main.js:123895:35)
        at R3Injector.get (C:\dist\bookety\server\main.js:123717:33)
        at NgModuleRef$1.get (C:\dist\bookety\server\main.js:136849:33)
        at R3Injector.get (C:\dist\bookety\server\main.js:123728:33)
        at injectInjectorOnly (C:\dist\bookety\server\main.js:113505:33)
        at Module.ɵɵinject (C:\dist\bookety\server\main.js:113509:57)
        at Object.MetaService_Factory [as factory] (C:\dist\bookety\server\main.js:210004:370)
  },
  zone: Zone {
    _parent: Zone {
      _parent: null,
      _name: '<root>',
      _properties: {},
      _zoneDelegate: [ZoneDelegate]
    },
    _name: 'angular',
    _properties: { isAngularZone: true, maybeDelayChangeDetection: false },
    _zoneDelegate: ZoneDelegate {
      _taskCounts: [Object],
      zone: [Circular],
      _parentDelegate: [ZoneDelegate],
      _forkZS: null,
      _forkDlgt: null,
      _forkCurrZone: null,
      _interceptZS: null,
      _interceptDlgt: null,
      _interceptCurrZone: null,
      _invokeZS: [Object],
      _invokeDlgt: [ZoneDelegate],
      _invokeCurrZone: [Circular],
      _handleErrorZS: [Object],
      _handleErrorDlgt: [ZoneDelegate],
      _handleErrorCurrZone: [Circular],
      _scheduleTaskZS: [Object],
      _scheduleTaskDlgt: [ZoneDelegate],
      _scheduleTaskCurrZone: [Circular],
      _invokeTaskZS: [Object],
      _invokeTaskDlgt: [ZoneDelegate],
      _invokeTaskCurrZone: [Circular],
      _cancelTaskZS: [Object],
      _cancelTaskDlgt: [ZoneDelegate],
      _cancelTaskCurrZone: [Circular],
      _hasTaskZS: [Object],
      _hasTaskDlgt: [ZoneDelegate],
      _hasTaskDlgtOwner: [Circular],
      _hasTaskCurrZone: [Circular]
    }
  },
  task: ZoneTask {
    _zone: Zone {
      _parent: [Zone],
      _name: 'angular',
      _properties: [Object],
      _zoneDelegate: [ZoneDelegate]
    },
    runCount: 0,
    _zoneDelegates: null,
    _state: 'notScheduled',
    type: 'microTask',
    source: 'Promise.then',
    data: ZoneAwarePromise [Promise] {
      __zone_symbol__state: 0,
      __zone_symbol__value: ReferenceError: navigator is not defined
          at CoreService.ios (C:\dist\bookety\server\main.js:209548:20)
          at new CoreService (C:\dist\bookety\server\main.js:209508:23)
          at Object.CoreService_Factory [as factory] (C:\dist\bookety\server\main.js:209846:61)
          at R3Injector.hydrate (C:\dist\bookety\server\main.js:123895:35)
          at R3Injector.get (C:\dist\bookety\server\main.js:123717:33)
          at NgModuleRef$1.get (C:\dist\bookety\server\main.js:136849:33)
          at R3Injector.get (C:\dist\bookety\server\main.js:123728:33)
          at injectInjectorOnly (C:\dist\bookety\server\main.js:113505:33)
          at Module.ɵɵinject (C:\dist\bookety\server\main.js:113509:57)
          at Object.MetaService_Factory [as factory] (C:\dist\bookety\server\main.js:210004:370)
    },
    scheduleFn: undefined,
    cancelFn: undefined,
    callback: [Function],
    invoke: [Function]
  }
}

[CrackerakiUA]

Workaround is definitely to not show flatpickr on Angular Universal, feel free to close the issue, just wanted you to know about this.