Who contributed to Meta on July 25, 2026?

4 developers shipped this update, including gnoff, Christoph Purrer, Van der Auwermeulen Grégoire, and Nicola Corti.

What were the notable Meta updates?

[Fiber] only remove properties from singletons on release, [Fiber] only remove properties from singletons on release (#37112), and Don't register unused RCTTimingCls in RN iOS (#57657).

REACT FIBER FIXES SINGLETON PROPERTY BLEED, REACT NATIVE STRIPS DEAD CODE

By RepoJournal · Filed 06:58 UTC on July 25, 2026 · About Meta

4 people shipped this

gnoff @gnoff 2 cited

Christoph Purrer @christophpurrer 1 cited

Van der Auwermeulen Grégoire @Gregoirevda 1 cited

Nicola Corti @cortinico 1 cited

React plugged a critical Fiber bug where singleton cleanup was nuking third-party attributes, while React Native dropped unused timing code from iOS binaries.

React merged a fix [1] [2] that rewrites how Fiber releases singleton instances. The old path was wiping all properties indiscriminately, which trashed any attributes set by third-party scripts and browser extensions on the same singleton. The new implementation clears only properties based on the last committed props for that fiber, preserving external state. This is the kind of invisible breaking change that would surface in production as mysteriously vanished DOM behavior.

Over on React Native, the team is cleaning house ahead of the new architecture cutover. RCTTiming got axed from iOS binaries [3] since it's not used in the new architecture and is slated for full deletion. Codegen now properly handles iOS platform extensions [4], fixing a bug where the platform argument was being passed as an array index instead of the actual platform string, which means you can now use .ios.ts files for native module specs. Gradle 9 resource warnings got addressed [5] ahead of AGP9 upgrades breaking the build.

Action items

→ Pull React with singleton Fiber fix before next release facebook/react [immediate]
→ Audit third-party script integrations if using older React Fiber versions facebook/react [plan]
→ Update React Native codegen usage to leverage iOS platform extensions facebook/react-native [monitor]

References

[1] [Fiber] only remove properties from singletons on release ↗ facebook/react
[2] [Fiber] only remove properties from singletons on release (#37112) facebook/react
[3] Don't register unused RCTTimingCls in RN iOS (#57657) facebook/react-native
[4] codegen: ios platform extensions (#57189) facebook/react-native
[5] Fix src/main/res warnings due to AGP9 (#57637) facebook/react-native

Quick answers

What shipped in Meta on July 25, 2026?: React plugged a critical Fiber bug where singleton cleanup was nuking third-party attributes, while React Native dropped unused timing code from iOS binaries. In total, 10 commits and 1 pull requests landed.
Who contributed to Meta on July 25, 2026?: 4 developers shipped this update, including gnoff, Christoph Purrer, Van der Auwermeulen Grégoire, and Nicola Corti.
What were the notable Meta updates?: [Fiber] only remove properties from singletons on release, [Fiber] only remove properties from singletons on release (#37112), and Don't register unused RCTTimingCls in RN iOS (#57657).

REACT DEVTOOLS BRIDGE HARDENS AGAINST RECONNECTS AND CORRUPTION

React's DevTools layer just got bulletproof: hoxyq landed four interconnected patches that eliminate silent state corruption, validate invariants before mutation, and handle extension reconnects with message buffering and handshakes.

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Meta 2 days ago

REACT SERVER DOM TURBOPACK GETS DYNAMIC CHUNK MERGING

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Meta 3 days ago

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React shipped performance wins across 19.0.8 and 19.1.9 while React Native patched a critical timeout bug that broke requestIdleCallback tasks.

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Meta 4 days ago

REACT PATCHES HIDDEN COMPONENT STATE BUG, REACT-NATIVE FIXES KEYBOARD TRAP

React shipped a critical fix for useSyncExternalStore mutations being missed when subtrees toggle visibility, while React-Native plugged an Android keyboard that won't close on unmount.

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