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wire 2026-07-29
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REACT FIXES PRODUCTION HANG IN SERVER-RENDERED APPS

By RepoJournal · Filed · About Meta · Composed from the cited sources · methodology

Alex Hunt gaearon Dawid Malecki Peter Abbondanzo Nicola Corti
5 people shipped this
Alex Hunt @huntie 2 cited gaearon @gaearon 1 cited Dawid Malecki @coado 1 cited Peter Abbondanzo @Abbondanzo 1 cited Nicola Corti @cortinico

React shipped an emergency fix for a critical hang that freezes apps when updates hit hidden server-rendered boundaries before hydration completes.

The hang [1] occurs when an update changes content inside a server-rendered Suspense or Activity boundary before that boundary has hydrated, and the affected content is hidden. React renders the new content once data arrives, but then discards the render every time, scheduling nothing and leaving the app frozen indefinitely. This is a production blocker for any Next.js app using server rendering with hidden content mutations. React Native 0.87 moves forward with stricter module boundaries [2], migrating internal imports to dedicated entry points like `react-private-interface` to enforce the private contract between React and React Native. On the Native side, artifact downloads now try a proxy cache server first before falling back to Maven Central and CocoaPods [3], speeding builds across the ecosystem. FileReader compliance gaps are closing [4], and a critical 0.87 bug with extensionless script imports is fixed [5], unblocking `react-native spm add` commands that were failing in the wild.

Action items

References

  1. [1] [Fiber] Fix hang when updating a dehydrated boundary inside a hidden tree ↗ facebook/react
  2. [2] [RN] Update ReactPrivate and InitializeCore imports (0.87 Strict API) (#36986) ↗ facebook/react
  3. [3] Download React Native artifacts from the proxy cache server first (#57325) ↗ facebook/react-native
  4. [4] Close remaining File API spec gaps in FileReader (#57745) ↗ facebook/react-native
  5. [5] Fix compat with extensionless scripts/* imports (#57718) ↗ facebook/react-native

$ ls meta/reviews/ # the step-back reads

the week in review React 19.3 ships View Transitions, RN 0.88-rc breaks Touchable the month in review React, React Native, and Jest harden the stack
Full archive → Weekly reviews →

Quick answers

What shipped in Meta on July 29, 2026?
React shipped an emergency fix for a critical hang that freezes apps when updates hit hidden server-rendered boundaries before hydration completes. In total, 15 commits and 2 pull requests landed.
Who contributed to Meta on July 29, 2026?
5 developers shipped this update, including gaearon, Alex Hunt, Dawid Malecki, Peter Abbondanzo, and Nicola Corti.
What were the notable Meta updates?
[Fiber] Fix hang when updating a dehydrated boundary inside a hidden tree, [RN] Update ReactPrivate and InitializeCore imports (0.87 Strict API) (#36986), and Download React Native artifacts from the proxy cache server first (#57325).
♥

$ log Meta --recent

React Native strips dead config, React compiler fixes exponent folding 21 shipped React Native's generated SwiftPM manifests inherit the app's iOS floor, and SectionList scrolls to the right row 30 shipped React stops emulating bubbling for toggle events, fixes Fragment compareDocumentPosition 9 shipped React Native's Babel preset stops dropping Platform.select side effects 6 shipped

$ log --all # elsewhere on the wire

Alignment & Post-training GSM8K scoring parses answers as exact decimals AI Red Teaming PyRIT closes a judge-spoofing hole, promptfoo accepts Langfuse v6

$ ls showcases/

Safety Evals AI Red Teaming Agent Security Interpretability Alignment & Post-training

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