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

In React Labs posts, we write about projects in active research and development. We’ve made significant progress since our last update, and we’d like to share our progress. React Conf 2024 is scheduled for May 15–16 in Henderson, Nevada! If you’re interested in attending React Conf in person, you can sign up for the ticket lottery until February 28th. For more info on tickets, free streaming, spon

In React Labs posts, we write about projects in active research and development. We’ve made significant progress on them since our last update, and we’d like to share what we learned. React Server Components React Server Components (or RSC) is a new application architecture designed by the React team. We’ve first shared our research on RSC in an introductory talk and an RFC. To recap them, we are

Effects are an escape hatch from the React paradigm. They let you “step outside” of React and synchronize your components with some external system like a non-React widget, network, or the browser DOM. If there is no external system involved (for example, if you want to update a component’s state when some props or state change), you shouldn’t need an Effect. Removing unnecessary Effects will make

React 18 was years in the making, and with it brought valuable lessons for the React team. Its release was the result of many years of research and exploring many paths. Some of those paths were successful; many more were dead-ends that led to new insights. One lesson we’ve learned is that it’s frustrating for the community to wait for new features without having insight into these paths that we’r

For React Native users, React 18 will ship in React Native with the New React Native Architecture. For more information, see the React Conf keynote here. What is Concurrent React? The most important addition in React 18 is something we hope you never have to think about: concurrency. We think this is largely true for application developers, though the story may be a bit more complicated for librar

As we shared in the release post, React 18 introduces features powered by our new concurrent renderer, with a gradual adoption strategy for existing applications. In this post, we will guide you through the steps for upgrading to React 18. Please report any issues you encounter while upgrading to React 18. For React Native users, React 18 will ship in a future version of React Native. This is beca

The Plan for React 18The React team is excited to share a few updates. We’ve started work on the React 18 release, which will be our next major version. We’ve created a Working Group to prepare the community for gradual adoption of new features in React 18. We’ve published a React 18 Alpha so that library authors can try it and provide feedback... The React team is excited to share a few updates:

You will build a small tic-tac-toe game during this tutorial. This tutorial does not assume any existing React knowledge. The techniques you’ll learn in the tutorial are fundamental to building any React app, and fully understanding it will give you a deep understanding of React. This tutorial is designed for people who prefer to learn by doing and want to quickly try making something tangible. If