function checkValidServiceWorker()

in Website/src/serviceWorker.ts [107:130]

• 20 lines of code
• 4 McCabe index (conditional complexity)

function checkValidServiceWorker(swUrl: string, config?: Config) {
    // Check if the service worker can be found. If it can't reload the page.
    fetch(swUrl, {
        headers: { "Service-Worker": "script" },
    })
        .then((response) => {
            // Ensure service worker exists, and that we really are getting a JS file.
            const contentType = response.headers.get("content-type");
            if (response.status === 404 || (contentType != null && contentType.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, config);
            }
        })
        .catch(() => {
            console.log("No internet connection found. App is running in offline mode.");
        });
}