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