How do I implement advanced router guards in Vue 3?

How do I implement advanced router guards in Vue 3?

In Vue 3, you can implement advanced router guards by using the beforeEach, beforeEnter, and afterEach hooks. These allow you to control access to routes based on conditions like authentication.

Can you give me an example of using beforeEach for authentication?

Sure! You can set up a beforeEach guard like this:

router.beforeEach((to, from, next) => {
  const isAuthenticated = // your logic to check authentication;
  if (to.meta.requiresAuth && !isAuthenticated) {
    next({ name: 'Login' }); // redirect to login if not authenticated
  } else {
    next(); // proceed to the route
  }
});

What if I want to add a loading spinner while the guard checks?

You can manage a loading state in your component. Set a loading flag to true before the guard checks and set it to false after the check is complete. Here's a simple example:

let loading = true;
router.beforeEach((to, from, next) => {
  loading = true;
  // your authentication logic
  loading = false;
  next();
});

Are there any performance considerations I should be aware of?

Yes, keep your guard logic efficient to avoid slowing down navigation. Avoid heavy computations and consider caching results where possible.