This beta release is for libraries to prepare for React 19. App developers should upgrade to 18.3.0 and wait for React 19 stable as we work with libraries and make changes based on feedback. In our React 19 Beta Upgrade Guide, we shared step-by-step instructions for upgrading your app to React 19 Beta. In this post, we’ll give an overview of the new features in React 19, and how you can adopt them