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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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																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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																} |