function checkValidServiceWorker()

in src/serviceWorker.js [110:138]

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

function checkValidServiceWorker(swUrl, 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.'
			);
		});
}