What’s new in create-react-app 4.0.0

Create React App is a tool officially supported by React that simplifies the setup of single-page applications by providing a modern build environment without requiring manual configuration. It allows users to effortlessly start a React project using commands tailored to their choice of package manager, such as npm or yarn. The tool comes with built-in configurations for Webpack and Babel, but users have the option to customize them if needed. The 4.0 release introduces features like fast refresh for real-time editing of components without losing state, the new JSX transform with React 17 compatibility, and TypeScript support. Additionally, it updates to ESLint 7 and upgrades Jest to version 26, while dropping support for the older Node 8. The release also offers seamless migration instructions from previous versions, emphasizing ease of transition to the new features and improved developer experience.