Who contributed to Meta on July 31, 2026?

6 developers shipped this update, including hoxyq, gnoff, 김민규(Mingyu Kim), Christian Falch, Nikita Levin, and Alex Hunt.

What were the notable Meta updates?

[DevTools] Reset extension backend on pagehide, [DevTools] Create extension panels before React detection, and [DevTools] Remove FlowFixMe from extension lifecycle.

REACT DEVTOOLS FIXES BFCACHE LIFECYCLE CRASHES, BROWSER API LANDS

By RepoJournal · Filed 06:58 UTC on July 31, 2026 · About Meta

6 people shipped this

hoxyq @hoxyq 3 cited

gnoff @gnoff 1 cited

김민규(Mingyu Kim) @zmunm 1 cited

Christian Falch @chrfalch 1 cited

Nikita Levin @Levin-nik 1 cited

Alex Hunt @huntie 1 cited

React DevTools just patched a critical lifecycle race that crashes during browser back/forward cache navigation, while React DOM gains a new browser() API for server-side suspense boundaries.

The DevTools team shipped three targeted fixes addressing inconsistency errors that cascade when Chrome freezes the JavaScript heap during BFCache transitions [1]. The root issue: Chrome kills the DevTools port while the backend stays alive, creating a state React never expects. Simultaneously, they're now creating extension panels before React detection, which solves a long-standing UX bug where panels wouldn't appear unless a React app was already loaded [2]. Type safety got a boost too with FlowFixMe removal from the extension lifecycle, catching real-world errors that only surfaced during BFCache sessions [3]. On the feature front, ReactDOM now exports a browser() API that returns a usable suspending on the server but resolving in the browser, codifying a common pattern for client-only components [4]. Over in React Native, XMLHttpRequest.setRequestHeader now appends duplicate headers per spec instead of overwriting them [5], a breaking change that fixes compatibility with libraries like Sentry that depend on append behavior. The Native team also hardened their build pipeline: new SwiftPM iOS e2e workflows for RNTester and HelloWorld [6], a codegen fix preventing spurious Xcode failures when no native specs are present [7], and strict API enforcement via updated ReactPrivate imports for 0.87 [8].

Action items

→ Update to latest DevTools if you use BFCache or navigate heavily in dev mode facebook/react [plan]
→ Flag XMLHttpRequest.setRequestHeader changes in integration tests before upgrading React Native facebook/react-native [plan]
→ Review ReactPrivate import paths if targeting React Native 0.87 facebook/react-native [monitor]

References

[1] [DevTools] Reset extension backend on pagehide ↗ facebook/react
[2] [DevTools] Create extension panels before React detection ↗ facebook/react
[3] [DevTools] Remove FlowFixMe from extension lifecycle ↗ facebook/react
[4] Add ReactDOM `browser()` API ↗ facebook/react
[5] Fix XMLHttpRequest.setRequestHeader to append duplicate headers per spec facebook/react-native
[6] CI: add SwiftPM iOS e2e workflows (RNTester, HelloWorld, new app) (#57659) facebook/react-native
[7] fix(codegen): empty ReactCodegen input_files when no Native spec files found (#57759) facebook/react-native
[8] Update ReactPrivate and InitializeCore imports (0.87 Strict API) (#36986) (#57753) facebook/react-native

Quick answers

What shipped in Meta on July 31, 2026?: React DevTools just patched a critical lifecycle race that crashes during browser back/forward cache navigation, while React DOM gains a new browser() API for server-side suspense boundaries. In total, 19 commits and 4 pull requests landed.
Who contributed to Meta on July 31, 2026?: 6 developers shipped this update, including hoxyq, gnoff, 김민규(Mingyu Kim), Christian Falch, Nikita Levin, and Alex Hunt.
What were the notable Meta updates?: [DevTools] Reset extension backend on pagehide, [DevTools] Create extension panels before React detection, and [DevTools] Remove FlowFixMe from extension lifecycle.

REACT DEVTOOLS GAINS PROFILER SEARCH, REACT NATIVE FIXES ANIMATION INITIALIZATION

React's Profiler just got the component search feature developers have been requesting, while React Native patches a critical animation backend timing issue across 13 commits and 2 PRs.

javascript 16 shipped

Meta Aug 5

REACT NATIVE PLUGS TWO CRITICAL CRASHES ACROSS ANDROID AND iOS

A percentage borderRadius on Android Images and a Debug/Release build swap on iOS are both fixed overnight, clearing two silent production killers from the pipeline.

javascript 5 shipped

Meta Aug 4

REACT DEVTOOLS KILLS TIMELINE PROFILER, PIVOTS TO PERFORMANCE PANEL

React DevTools is retiring its built-in Timeline profiler and steering users to the browser's native Performance tracks instead, ripping out 74 files of dead code in the process.

javascript 16 shipped

Meta Aug 3

REACT NATIVE QUIETLY UPGRADES CODE FORMATTER INTERNALS

One commit landed on React Native master overnight, and it's all infrastructure.

javascript 1 shipped

Elsewhere on the wire

AI Agents Aug 6

LANGCHAIN HARDENS ANTHROPIC TOOL CALLING AND GIT CREDENTIALS AS OPENHANDS SHIPS 1.10.0

LangChain fixed a critical credential leak in evaluation runs while Anthropic tool schemas get proper fallback handling, as three major agent frameworks push releases across the ecosystem.

ai-agents 54 shipped

Local LLMs Aug 6

OLLAMA FIXES KV CACHE CORRUPTION, LLAMA.CPP HARDENS FILE SEARCH, VLLM KILLS MOE LEGACY CODE

Ollama patched a critical cache corruption bug that corrupts lazy snapshots during multi-request prefills, while llama.cpp hardened Windows junction traversal and vLLM removed 14 hardcoded MoE shards across quantization methods.