How do I set up a Vue component using the setup function?

How do I set up a Vue component using the setup function?

To set up a Vue component using the setup function, you start by defining the component with the setup method. This method is where you can declare reactive state and computed properties.

Can you show me a simple example?

Sure! Here's a basic example:

import { defineComponent, ref } from 'vue';

export default defineComponent({
  setup() {
    const count = ref(0);
    const increment = () => count.value++;
    return { count, increment };
  }
});

What are the benefits of using the setup function?

The setup function provides better organization of code, allows for easier testing, and improves TypeScript support by enabling better type inference.

Is it compatible with Vue 2?

No, the setup function is a feature of Vue 3. In Vue 2, you would use the options API instead.