lsiten-editor-v2/static/js/serverWorker.js

window.addEventListener("load", function() {
  console.log("Will the service worker register?");
  navigator.serviceWorker.register('/static/js/sw-3.js')
  .then(function(reg){
      console.log("Yes, it did.");
  }).catch(function(err) {
      console.log("No it didn't. This happened: ", err)
  }); 
});