sw-registartion.js

if ('serviceWorker' in navigator) { 
  navigator.serviceWorker.register('service-worker.js').then(function(registration) {
    // Registration was successful 
    console.log('ServiceWorker registration successful with scope: ', registration.scope);
  }).catch(function(err) {
    // registration failed :(
    console.log('ServiceWorker registration failed: ', err);
  });
}