Service Worker Notification Click

service-worker-notification.js

self.addEventListener('notificationclick', function(event) {  
  console.log('On notification click: ', event.notification.tag);  
  // Android doesn't close the notification when you click on it  
  // See: http://crbug.com/463146  
  event.notification.close();

  // This looks to see if the current is already open and  
  // focuses if it is  
  event.waitUntil(
    clients.matchAll({  
      type: "window"  
    })
    .then(function(clientList) {  
      for (var i = 0; i < clientList.length; i++) {  
        var client = clientList[i];  
        if (client.url == '/' && 'focus' in client)  
          return client.focus();  
      }  
      if (clients.openWindow) {
        return clients.openWindow('https://deanhume.github.io/typography');  
      }
    })
  );
});

What browser are you using?

i m using Chrome,
i m developing in VS code Editor. I have installed Lint for error checking,
Lint is highlighting this as error, it is expecting it to be defined.

@rajeevAgilehub Navigate to eslint config file and explore "env" section for more details.

"env": {
"clients": true,
"self": true.

Or otherwise, disable linting for this file only.