What are the best practices for using async route guards in Vue Router?

What are the best practices for using async route guards in Vue Router?

When using async route guards in Vue Router, it's important to ensure that your guards are efficient and handle errors gracefully. You should also consider using Promises to manage asynchronous operations and avoid blocking the navigation.

Can you give me an example of an async route guard?

Sure! Here's a simple example:

router.beforeEach((to, from, next) => {
  const isAuthenticated = checkAuthentication(); // Assume this returns a Promise
  isAuthenticated.then(auth => {
    if (auth) {
      next(); // Proceed to the route
    } else {
      next('/login'); // Redirect to login
    }
  }).catch(error => {
    console.error(error);
    next('/error'); // Redirect to an error page
  });
});

What should I avoid when implementing async route guards?

Avoid performing heavy computations or synchronous operations inside your async route guards, as they can block the navigation. Also, ensure that you handle all possible errors to prevent the application from crashing.

How can I test my async route guards?

You can test async route guards by using unit tests with a testing framework like Jest. Mock the router and simulate navigation to check if the guards behave as expected under different scenarios.