How do I use the Composition API with async setup in Vue 3?

How do I use the Composition API with async setup in Vue 3?

You can use the async setup function to handle asynchronous operations in Vue 3's Composition API. This allows you to fetch data or perform other async tasks before the component is created.

Can you show me a code example of that?

Sure! Here's a simple example:

import { ref } from 'vue';

export default {
  async setup() {
    const data = ref(null);
    const error = ref(null);

    try {
      const response = await fetch('https://api.example.com/data');
      data.value = await response.json();
    } catch (err) {
      error.value = err;
    }

    return { data, error };
  }
};

What happens if the fetch fails?

If the fetch fails, the error will be caught in the catch block, and you can handle it accordingly. In the example, the error is stored in the error ref, which you can use in your template to display an error message.