What is the difference between vue4 and vue3

With the continuous development of front-end technology, vue.js has become the framework of choice for more and more front-end engineers. This article will explore the differences between the two versions of vue4 and vue3.

Improvements of Vue3
Compared with Vue2, the biggest improvement of Vue3 is the introduction of Composition API. This API is designed to better reuse component behavior logic and state, especially in the case of large applications. The Composition API replaces the Options API of Vue2.x. It is an API style based on functional programming and logic reuse. Many Vue developers believe that this style is more natural and intuitive.

In addition, Vue3 has also made some other improvements, such as:

1. Rendering performance optimization
Vue3 has made a lot of optimizations in rendering performance. First, Vue3 rewrites the virtual DOM to better handle data changes in large applications. In addition, Vue3 also uses static lifting technology, which makes the compiled code smaller and faster.

2. Better TypeScript support
Vue3 has made some improvements in TypeScript support. For example, TypeScript's type inference is optimized and the declaration of class components is supported.

3. Better development experience
The development experience of Vue3 has also been improved to a certain extent. For example, new debugging tools have been introduced to support custom instructions and custom renderers.

Expected improvements in Vue4
Although Vue3 has provided many improvements, the Vue team is still constantly exploring better technical solutions. Some expected improvements to Vue4 include:

1. Better modular support
The Vue4 team is considering how to better support modular development and provide better ways to organize code.

2. Better TypeScript support
The Vue4 team is also exploring how to better support TypeScript and provide better type inference functionality.

3. Better ecosystem integration
The Vue4 team is considering how to better integrate the Vue ecosystem, including vuex, vue-router, etc.

Conclusion
The improvements in Vue3 and Vue4 are all designed to make it easier for developers to develop front-end applications. As these improvements are continuously explored, Vue's ecosystem will continue to improve and evolve.

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