Register a service worker

register-sw.js

if ('serviceWorker' in navigator) {
    window.addEventListener('load', function() {
        navigator.serviceWorker
            .register('path/to/service-worker.js')
            .then(registration => {
                console.log('SW registered: ', registration);
            })
            .catch(registrationError => {
                console.log('SW registration failed: ', registrationError);
            });
    });
}