Meta's frontend library ships its biggest update in years, bringing native signal-based reactivity and full server-side streaming.
React 20 has officially landed, bringing the most significant architectural changes since the introduction of hooks in React 16.8.
React 20 introduces a built-in signal primitive that enables fine-grained reactivity without the need for external state management libraries like Zustand or Jotai.
Full server-side streaming is now supported out of the box, allowing components to stream HTML progressively to the client as data becomes available.
The React team has published a comprehensive migration guide. Most applications will require minimal changes to upgrade from React 19.
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React Blog
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