Vue3: Modern Frontend App Development

Vue.js is a progressive JavaScript framework used for building user interfaces. It allows developers to create web applications through a flexible and modular architecture, making it easy to integrate with other projects and libraries.

Vue 3 introduces several key features including the Composition API, which provides a more flexible way to organize logic; multiple root elements in components; Fragments; improved performance; and better TypeScript integration.

The Composition API in Vue 3 allows developers to better organize and reuse code by extracting logic into reusable functions, known as 'composables'. This API makes the codebase more maintainable and scalable by providing a clearer structure and reducing dependencies on the 'this' keyword.

Yes, Vue 3 supports multiple root nodes in components, allowing developers to return multiple elements from a component without a single wrapping element. This feature simplifies the component structure and eliminates unnecessary DOM elements.

The Teleport feature in Vue 3 allows developers to render components in different parts of the DOM that are outside the main app container. This is useful for modals, notifications, and other elements that need to break out of the normal document flow.

Vue 3 offers improved TypeScript support, making it easier to build robust applications by providing better type inference, enabling more accurate autocompletion, and enhancing code verification and refactoring capabilities.

Developers can migrate from Vue 2 to Vue 3 by gradually introducing Vue 3 features into their existing projects, updating their components to use the Composition API, and making use of the new features like multiple root nodes and Teleport. Vue provides a migration guide to help ease this transition.

Vue CLI is a command-line tool for Vue.js development that simplifies the process of setting up and managing Vue projects. It provides built-in configurations for tools like Babel and Webpack, and allows developers to quickly scaffold and configure new projects with best practices.