A change event is fired at a CookieStore object when a change is made to any cookie.

Use the event name in methods like addEventListener(), or set an event handler property.

cookieStore.addEventListener("change", (event) => { })

cookieStore.onchange = (event) => { }

To be informed when a cookie has changed, you can add a handler to the cookieStore instance using addEventListener(), like this:

cookieStore.addEventListener("change", (event) => {
  console.log("1 change event");
});

Alternatively, you can use the CookieStore.onchange event handler property to establish a handler for the change event:

cookieStore.onchange = (event) => {
  console.log("1 change event");
};