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).

REACT FIXES PRODUCTION HANG IN SERVER-RENDERED APPS

By RepoJournal · Filed 06:59 UTC on July 29, 2026 · About Meta

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

→ Upgrade React to latest patch immediately if running server rendering with hidden boundary updates facebook/react [immediate]
→ Update React Native imports to use react-private-interface before upgrading to 0.87 facebook/react-native [plan]
→ Test script imports and artifact resolution after updating to React Native 0.87 facebook/react-native [monitor]

References

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

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).

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