## 4.0.0 (2020-10-23)
Create React App 4.0 is a major release with several new features, including support for Fast Refresh!
Thanks to all the maintainers and contributors who worked so hard on this release! :raised_hands:
# Highlights
- Fast Refresh [#8582](https://github.com/facebook/create-react-app/pull/8582)
- React 17 support
- New JSX transform [#9645](https://github.com/facebook/create-react-app/pull/9645)
- TypeScript 4 support [#9734](https://github.com/facebook/create-react-app/pull/9734)
- ESLint 7 [#8978](https://github.com/facebook/create-react-app/pull/8978)
- New Jest and React Testing Library rules [#8963](https://github.com/facebook/create-react-app/pull/8963)
- Jest 26 [#8955](https://github.com/facebook/create-react-app/pull/8955)
- PWA/workbox improvements
- Switch to the Workbox InjectManifest plugin [#9205](https://github.com/facebook/create-react-app/pull/9205)
- Now its own template so it can be released independently
- Web Vitals support [#9116](https://github.com/facebook/create-react-app/pull/9116)
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