Clear Service Workers, Cypress

clear-service-workers.js

// From https://github.com/cypress-io/cypress/issues/702#issuecomment-435873135
beforeEach(() => {
	if (window.navigator && navigator.serviceWorker) {
		navigator.serviceWorker.getRegistrations()
			.then((registrations) => {
				registrations.forEach((registration) => {
					registration.unregister();
				});
			});
	}
});

Is this actually necessary since Cypress creates a new session on each run?

I think it is necessary, but I think it is necessary to wait until all registrations have unregistered:

  beforeEach(async () => {
    if (!window.navigator || !navigator.serviceWorker) {
      return null;
    }
    const registrations = await navigator.serviceWorker.getRegistrations();
    return Promise.all(registrations.map((registration) => {
      return registration.unregister();
    }));
  });

Also, on a related topic, FWIW, the section at https://glebbahmutov.com/blog/cypress-tips-and-tricks/#disable-serviceworker mentions how to disable service worker registrations.