Function checkValidServiceWorker

with-workbox/src/serviceWorkerRegistration.js:102–130

(swUrl, config)

}

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."
      );
    });
}

export function unregister() {
  if ("serviceWorker" in navigator) {