One of the main goals of Vue.js 3 is to provide better performance than its predecessor. To achieve this goal, Vue.js 3 includes a new reactive system that is faster and more efficient than the one used in Vue.js 2. The new system is based on the Proxy API, which allows Vue.js to track changes to data more efficiently. This results in faster updates to the user interface and better overall performance.
Another key feature of Vue.js 3 is the new Composition API. This API provides a new way of writing components that is more flexible and powerful than the Оptions API used in Vue.js 2. The Composition API allows developers to organize their code into reusable logic that can be shared across components. This makes it easier to build complex applications and reduces the amount of duplicate code.
Vue.js 3 also includes improvements to the template syntax used to build user interfaces. The new syntax is simpler and more intuitive, making it easier for developers to read and write templates. In addition, Vue.js 3 includes improvements to the way templates are compiled, which results in faster rendering times and better performance.
Another important change in Vue.js 3 is the way it handles custom directives. In Vue.js 2, custom directives were global and could affect all components in an application. In Vue.js 3, custom directives are scoped to the component they are defined in, which makes it easier to reason about how components behave and reduces the likelihood of naming collisions.
Vue.js 3 also includes improvements to the way it handles TypeScript. The framework now includes better support for TypeScript, including improved type inference and better integration with TypeScript tools.
Finally, Vue.js 3 includes improvements to the way it handles server-side rendering (SSR). SSR is an important feature for building web applications that are fast and SEO-friendly. Vue.js 3 includes improvements to the way it handles SSR, which results in faster rendering times and better overall performance.