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					// In production, we register a service worker to serve assets from local cache.
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					// This lets the app load faster on subsequent visits in production, and gives
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					// it offline capabilities. However, it also means that developers (and users)
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					// will only see deployed updates on the "N+1" visit to a page, since previously
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					// cached resources are updated in the background.
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					// To learn more about the benefits of this model, read https://goo.gl/KwvDNy.
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					// This link also includes instructions on opting out of this behavior.
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					const isLocalhost = Boolean( | 
				
			
			
		
	
		
			
				
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					  window.location.hostname === 'localhost' || | 
				
			
			
		
	
		
			
				
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					    // [::1] is the IPv6 localhost address.
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					    window.location.hostname === '[::1]' || | 
				
			
			
		
	
		
			
				
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					    // 127.0.0.1/8 is considered localhost for IPv4.
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					    window.location.hostname.match( | 
				
			
			
		
	
		
			
				
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					      /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/ | 
				
			
			
		
	
		
			
				
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					    ) | 
				
			
			
		
	
		
			
				
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					); | 
				
			
			
		
	
		
			
				
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					export default function register() { | 
				
			
			
		
	
		
			
				
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					  if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) { | 
				
			
			
		
	
		
			
				
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					    // The URL constructor is available in all browsers that support SW.
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					    const publicUrl = new URL(process.env.PUBLIC_URL, window.location); | 
				
			
			
		
	
		
			
				
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					    if (publicUrl.origin !== window.location.origin) { | 
				
			
			
		
	
		
			
				
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					      // Our service worker won't work if PUBLIC_URL is on a different origin
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					      // from what our page is served on. This might happen if a CDN is used to
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					      // serve assets; see https://github.com/facebookincubator/create-react-app/issues/2374
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					      return; | 
				
			
			
		
	
		
			
				
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					    } | 
				
			
			
		
	
		
			
				
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					    window.addEventListener('load', () => { | 
				
			
			
		
	
		
			
				
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					      const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`; | 
				
			
			
		
	
		
			
				
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					      if (isLocalhost) { | 
				
			
			
		
	
		
			
				
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					        // This is running on localhost. Lets check if a service worker still exists or not.
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					        checkValidServiceWorker(swUrl); | 
				
			
			
		
	
		
			
				
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					        // Add some additional logging to localhost, pointing developers to the
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					        // service worker/PWA documentation.
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					        navigator.serviceWorker.ready.then(() => { | 
				
			
			
		
	
		
			
				
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					          console.log( | 
				
			
			
		
	
		
			
				
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					            'This web app is being served cache-first by a service ' + | 
				
			
			
		
	
		
			
				
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					              'worker. To learn more, visit https://goo.gl/SC7cgQ' | 
				
			
			
		
	
		
			
				
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					          ); | 
				
			
			
		
	
		
			
				
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					        }); | 
				
			
			
		
	
		
			
				
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					      } else { | 
				
			
			
		
	
		
			
				
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					        // Is not local host. Just register service worker
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					        registerValidSW(swUrl); | 
				
			
			
		
	
		
			
				
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					      } | 
				
			
			
		
	
		
			
				
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					    }); | 
				
			
			
		
	
		
			
				
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					  } | 
				
			
			
		
	
		
			
				
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					} | 
				
			
			
		
	
		
			
				
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					function registerValidSW(swUrl) { | 
				
			
			
		
	
		
			
				
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					  navigator.serviceWorker | 
				
			
			
		
	
		
			
				
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					    .register(swUrl) | 
				
			
			
		
	
		
			
				
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					    .then(registration => { | 
				
			
			
		
	
		
			
				
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					      registration.onupdatefound = () => { | 
				
			
			
		
	
		
			
				
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					        const installingWorker = registration.installing; | 
				
			
			
		
	
		
			
				
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					        installingWorker.onstatechange = () => { | 
				
			
			
		
	
		
			
				
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					          if (installingWorker.state === 'installed') { | 
				
			
			
		
	
		
			
				
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					            if (navigator.serviceWorker.controller) { | 
				
			
			
		
	
		
			
				
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					              // At this point, the old content will have been purged and
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					              // the fresh content will have been added to the cache.
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					              // It's the perfect time to display a "New content is
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					              // available; please refresh." message in your web app.
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					              console.log('New content is available; please refresh.'); | 
				
			
			
		
	
		
			
				
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					            } else { | 
				
			
			
		
	
		
			
				
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					              // At this point, everything has been precached.
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					              // It's the perfect time to display a
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					              // "Content is cached for offline use." message.
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					              console.log('Content is cached for offline use.'); | 
				
			
			
		
	
		
			
				
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					            } | 
				
			
			
		
	
		
			
				
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					          } | 
				
			
			
		
	
		
			
				
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					        }; | 
				
			
			
		
	
		
			
				
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					      }; | 
				
			
			
		
	
		
			
				
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					    }) | 
				
			
			
		
	
		
			
				
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					    .catch(error => { | 
				
			
			
		
	
		
			
				
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					      console.error('Error during service worker registration:', error); | 
				
			
			
		
	
		
			
				
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					    }); | 
				
			
			
		
	
		
			
				
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					} | 
				
			
			
		
	
		
			
				
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					function checkValidServiceWorker(swUrl) { | 
				
			
			
		
	
		
			
				
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					  // Check if the service worker can be found. If it can't reload the page.
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					  fetch(swUrl) | 
				
			
			
		
	
		
			
				
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					    .then(response => { | 
				
			
			
		
	
		
			
				
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					      // Ensure service worker exists, and that we really are getting a JS file.
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					      if ( | 
				
			
			
		
	
		
			
				
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					        response.status === 404 || | 
				
			
			
		
	
		
			
				
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					        response.headers.get('content-type').indexOf('javascript') === -1 | 
				
			
			
		
	
		
			
				
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					      ) { | 
				
			
			
		
	
		
			
				
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					        // No service worker found. Probably a different app. Reload the page.
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					        navigator.serviceWorker.ready.then(registration => { | 
				
			
			
		
	
		
			
				
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					          registration.unregister().then(() => { | 
				
			
			
		
	
		
			
				
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					            window.location.reload(); | 
				
			
			
		
	
		
			
				
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					          }); | 
				
			
			
		
	
		
			
				
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					        }); | 
				
			
			
		
	
		
			
				
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					      } else { | 
				
			
			
		
	
		
			
				
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					        // Service worker found. Proceed as normal.
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					        registerValidSW(swUrl); | 
				
			
			
		
	
		
			
				
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					      } | 
				
			
			
		
	
		
			
				
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					    }) | 
				
			
			
		
	
		
			
				
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					    .catch(() => { | 
				
			
			
		
	
		
			
				
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					      console.log( | 
				
			
			
		
	
		
			
				
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					        'No internet connection found. App is running in offline mode.' | 
				
			
			
		
	
		
			
				
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					      ); | 
				
			
			
		
	
		
			
				
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					    }); | 
				
			
			
		
	
		
			
				
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					} | 
				
			
			
		
	
		
			
				
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					export function unregister() { | 
				
			
			
		
	
		
			
				
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					  if ('serviceWorker' in navigator) { | 
				
			
			
		
	
		
			
				
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					    navigator.serviceWorker.ready.then(registration => { | 
				
			
			
		
	
		
			
				
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					      registration.unregister(); | 
				
			
			
		
	
		
			
				
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					    }); | 
				
			
			
		
	
		
			
				
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					  } | 
				
			
			
		
	
		
			
				
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					} |