The index.js file

index.js

logoutButon.addEventListener('click', function() { 
  const isLeaved = confirm('Do you want to log out?');
  if (isLeaved) {
    // logout from cometchat and then clear storage.
    CometChatWidget.logout().then(response => {
      // User successfully logged out.
      // Perform any clean up if required.
      // redirect to login page.
      window.location.href = '/login.html';
    });
  }
});