 UpdateAvailableEvent interface   An event emitted when a new version of the app is available. interface UpdateAvailableEvent {
  type: 'UPDATE_AVAILABLE'
  current: {...}
  available: {...}
} See also  
Service worker communication guide   Properties    Property Description      type: 'UPDATE_AVAILABLE'       current: {
    hash: string;
    appData?: Object;
}       available: {
    hash: string;
    appData?: Object;
}       

    
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