function registerValidSW()

in tools/CCPLogParser/src/serviceWorker.js [57:99]
33 lines of code
8 McCabe index (conditional complexity)

            function registerValidSW(swUrl, config) {
                navigator.serviceWorker
                .register(swUrl)
                .then(registration => {
                    registration.onupdatefound = () => {
                        const installingWorker = registration.installing;
                        if (installingWorker == null) {
                            return;
                        }
                        installingWorker.onstatechange = () => {
                            if (installingWorker.state === 'installed') {
                                if (navigator.serviceWorker.controller) {
                                    // At this point, the updated precached content has been fetched,
                                    // but the previous service worker will still serve the older
                                    // content until all client tabs are closed.
                                    console.log(
                                        'New content is available and will be used when all ' +
                                        'tabs for this page are closed. See https://bit.ly/CRA-PWA.'
                                        );
                                        
                                        // Execute callback
                                        if (config && config.onUpdate) {
                                            config.onUpdate(registration);
                                        }
                                    } 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.');
                                        
                                        // Execute callback
                                        if (config && config.onSuccess) {
                                            config.onSuccess(registration);
                                        }
                                    }
                                }
                            };
                        };
                    })
                    .catch(error => {
                        console.error('Error during service worker registration:', error);
                    });
                }