router.addRoutes() is deprecated and has been removed in Vue Router 4. Use router.addRoute() instead.

As an AI language model, I don't have the context to provide a specific answer to this question. However, I can provide some general information on the deprecation of router.addRoutes() in Vue Router 4.

In Vue Router 4, the router.addRoutes() method has been deprecated and removed in favor of the router.addRoute() method. This change was made to simplify and streamline the API, as well as to improve performance and reduce code complexity.

The new router.addRoute() method allows you to dynamically add routes to the router at runtime. It takes a single route configuration object as its argument, which can contain nested routes and other options.

To use the new method, simply replace calls to router.addRoutes() with calls to router.addRoute(). Make sure to update any references to the old method in your code.

Overall, this change should not have a major impact on most Vue Router applications, but it is important to be aware of the deprecation and make the necessary changes to your code if you are using the old method.