How do I handle async operations in Vue.js router guards?

How do I handle async operations in Vue.js router guards?

In Vue.js, you can handle async operations in router guards by returning a Promise. This allows you to wait for the async operation to complete before proceeding.

Can you give me an example of that?

Sure! In your router configuration, you can use an async function in the beforeEnter guard like this:

beforeEnter: async (to, from, next) => {
  const isAuthenticated = await checkAuth();
  if (isAuthenticated) {
    next();
  } else {
    next('/login');
  }
}

What if I need to handle multiple async operations?

You can use Promise.all to handle multiple async operations. For example:

beforeEnter: async (to, from, next) => {
  const [isAuthenticated, userData] = await Promise.all([
    checkAuth(),
    fetchUserData()
  ]);
  if (isAuthenticated) {
    next();
  } else {
    next('/login');
  }
}

Are there any performance considerations I should be aware of?

Yes, be cautious with the number of async operations you perform in router guards, as they can slow down navigation. Optimize by caching results or limiting the number of calls.