How to use

installing

function

in

ServiceWorkerRegistration

.then(registration => {
 registration.onupdatefound = () => {
  const installingWorker = registration.installing;
  if (installingWorker == null) {
   return;

.then(registration => {
 registration.onupdatefound = () => {
  const installingWorker = registration.installing;
  if (installingWorker == null) {
   return;

.then(registration => {
 registration.onupdatefound = () => {
  const installingWorker = registration.installing;
  if (installingWorker == null) {
   return;

.then(registration => {
 registration.onupdatefound = () => {
  const installingWorker = registration.installing;
  if (installingWorker == null) {
   return;

.then(registration => {
 registration.onupdatefound = () => {
  const installingWorker = registration.installing;
  if (installingWorker == null) {
   return;

.then(registration => {
 registration.onupdatefound = () => {
  const installingWorker = registration.installing;
  if (installingWorker == null) {
   return;

.then(registration => {
 registration.onupdatefound = () => {
  const installingWorker = registration.installing;
  if (installingWorker == null) {
   return;

.then(registration => {
 registration.onupdatefound = () => {
  const installingWorker = registration.installing;
  if (installingWorker == null) {
   return;

.then(registration => {
 registration.onupdatefound = () => {
  const installingWorker = registration.installing;
  if (installingWorker == null) {
   return;

.then(registration => {
 registration.onupdatefound = () => {
  const installingWorker = registration.installing;
  if (installingWorker == null) {
   return;

.then(registration => {
 registration.onupdatefound = () => {
  const installingWorker = registration.installing;
  if (installingWorker == null) {
   return;

.then(registration => {
 registration.onupdatefound = () => {
  const installingWorker = registration.installing;
  if (installingWorker == null) {
   return;

.then(registration => {
 registration.onupdatefound = () => {
  const installingWorker = registration.installing;
  if (installingWorker == null) {
   return;

.then(registration => {
 registration.onupdatefound = () => {
  const installingWorker = registration.installing;
  if (installingWorker == null) {
   return;

.then(registration => {
 registration.onupdatefound = () => {
  const installingWorker = registration.installing;
  if (installingWorker == null) {
   return;