Do you have experience transitioning from Vue 2 to Vue 3? Tell me how it went, what difficulties you faced.

The transition from Vue 2 to Vue 3 involved some challenges related to changes in the API and architecture. Key points:

• Composition API instead of Options API: had to relearn how to write component logic, which initially seemed unfamiliar.
• Changes in reactivity: Vue 3 uses Proxy, which improves performance but requires understanding new principles.
• Updating third-party libraries: not all plugins and components were immediately compatible with Vue 3, so alternatives had to be found or custom solutions developed.

Example of using Composition API:

import { ref, onMounted } from 'vue';

export default {
  setup() {
    const count = ref(0);
    onMounted(() => {
      console.log('Component mounted');
    });
    function increment() {
      count.value++;
    }
    return { count, increment };
  }
}

Overall, the transition provided a significant boost in performance and flexibility, but required time to adapt.