What is different between Vue2 and Vue3?

Vue 3 is the latest version of the Vue.js framework and comes with several new features and improvements over Vue 2. Some of the major differences between Vue 2 and Vue 3 are:

1. Improved Performance: Vue 3 has a new rendering engine called “Compiler 2.0” which is designed to generate faster and smaller bundle sizes. Vue 3 also has a new reactive system that reduces the amount of boilerplate code and provides better performance for larger applications.

2. Composition API: Vue 3 introduces a new way to organize code called the “Composition API”. It allows developers to write reusable code using functions and makes it easier to share logic between components. This is a significant improvement over the “Options API” used in Vue 2.

3. Smaller Bundle Size: Vue 3 comes with a smaller bundle size due to better tree-shaking capabilities and modular architecture.

4. New Features: Vue 3 has several new features such as Fragments, Teleport, and Suspense that make it easier to build complex user interfaces.

5. TypeScript Support: Vue 3 has better TypeScript support, making it easier for developers to write type-safe code.

6. Custom Renderer: Vue 3 introduces a new API for custom renderers, making it easier to build custom rendering engines and integrate Vue with other frameworks.

Overall, Vue 3 is a significant improvement over Vue 2, with better performance, a new composition API, smaller bundle size, and several new features. However, it may require some changes to your existing codebase to upgrade from Vue 2 to Vue 3.