Who contributed to Meta on June 18, 2026?

3 developers shipped this update, including poteto, Boshen, and hoxyq.

What were the notable Meta updates?

[compiler] Count loop reassignments as the enclosing scope reassigning the variable, [rust-compiler] Switch to hmac-sha256 and bump napi/similar, and (Redo D108193641) remove `useNativeDriver` under featureflag animatedForceNativeDriver" (#57250).

REACT COMPILER FIXES MEMO CACHE MISSES, REACT NATIVE REVERTS ANIMATION FLAG

By RepoJournal · Filed 06:03 UTC on June 18, 2026 · About Meta

3 people shipped this

poteto @poteto 1 cited

Boshen @Boshen 1 cited

hoxyq @hoxyq 1 cited

React's compiler shipped a critical fix for loop reassignments that were breaking memoization on every render, while React Native's animation feature flag landed, then immediately reverted.

The React compiler had a bug where variables incremented inside memo scopes were compared at their pre-loop value (constant every render) while the cache stored the post-loop value, causing memos to never hit and force full recomputation [1]. This is the kind of silent correctness issue that ships broken performance into production. Separately, React bumped its Rust compiler dependencies by switching from discrete `sha2` + `hmac` crates to a single `hmac-sha256` implementation, cutting Fast Refresh hash generation from 11 transitive crates down to a cleaner dependency tree [2]. On the React Native front, a feature flag to force native drivers for all animations landed [3], but the team immediately reverted it in the same window, suggesting integration issues downstream [4]. The Native team also shipped Chrome DevTools Protocol support for script injection on new documents [5] and removed the experimental image request downgrading feature flag after backing out the behavior it gated [6]. A changelog cleanup fixed an entry for a fix that never actually merged to the release branch [7]. React DevTools is getting a new low-level facade package for runtime state introspection, laying groundwork for MCP-server integrations [8].

Action items

→ Review and test memo-dependent code after pulling the loop reassignment fix facebook/react [plan]
→ Monitor React Native 0.84+ for animation driver stability after the revert facebook/react-native [monitor]
→ Upgrade React Rust compiler tooling if you're on a locked dependency facebook/react [plan]

References

[1] [compiler] Count loop reassignments as the enclosing scope reassigning the variable ↗ facebook/react
[2] [rust-compiler] Switch to hmac-sha256 and bump napi/similar ↗ facebook/react
[3] (Redo D108193641) remove `useNativeDriver` under featureflag animatedForceNativeDriver" (#57250) facebook/react-native
[4] Revert D108193641: remove `useNativeDriver` under featureflag animatedForceNativeDriver facebook/react-native
[5] Implement Page.addScriptToEvaluateOnNewDocument CDP handler (#57248) facebook/react-native
[6] Remove offscreen image request downgrading feature flag (#57226) facebook/react-native
[7] chore(changelog) remove non-merged fix from changelog (#57253) facebook/react-native
[8] [react-devtools-facade] 1/ scaffold package + installFacade building block ↗ facebook/react

Quick answers

What shipped in Meta on June 18, 2026?: React's compiler shipped a critical fix for loop reassignments that were breaking memoization on every render, while React Native's animation feature flag landed, then immediately reverted. In total, 17 commits and 4 pull requests landed.
Who contributed to Meta on June 18, 2026?: 3 developers shipped this update, including poteto, Boshen, and hoxyq.
What were the notable Meta updates?: [compiler] Count loop reassignments as the enclosing scope reassigning the variable, [rust-compiler] Switch to hmac-sha256 and bump napi/similar, and (Redo D108193641) remove `useNativeDriver` under featureflag animatedForceNativeDriver" (#57250).

REACT BENCH TOOLING GETS JSON OUTPUT, EYES NEXT.JS INTEGRATION

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Meta 2 days ago

REACT NATIVE CLEANS UP CLI INTERNALS ACROSS 4 COMMITS

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Meta 3 days ago

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

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