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wire 2026-08-23
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React plugs memory leaks in Flight and Fizz

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

unstubbable
1 person shipped this
unstubbable @unstubbable 2 cited

React's server rendering stack just got a memory fix that matters for long-lived signals.

React's server renderer was leaking entire rendered outputs in memory for as long as a caller's AbortSignal lived. Two patches from unstubbable fix this: one stops the caller's signal from retaining a finished render [1], the other aborts the cache signal when debug objects are retained [2]. For Flight, debug objects that exceed the model's object limit stay retained until the client asks for them, which kept renders alive longer than needed. Composite signals from AbortSignal.any() and timeout signals are the worst offenders, because the runtime holds onto them for the lifetime of the process. These fixes close that leak on the success path, where the abort listener previously stayed attached. Over in React Native, a routine Flow upgrade in fbsource [3] landed, nothing to rush for. This is the kind of cleanup you want in before your next server render spike.

$ 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
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Quick answers

What shipped in Meta on August 23, 2026?
React's server rendering stack just got a memory fix that matters for long-lived signals. In total, 3 commits and 2 pull requests landed.
Who contributed to Meta on August 23, 2026?
1 developer shipped this update, including unstubbable.
What were the notable Meta updates?
[Flight/Fizz] Stop the caller's signal from retaining a finished render, [Flight] Abort the cache signal when debug objects are retained, and Upgrade Flow in fbsource (#58076).
♥

$ 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

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$ ls showcases/

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

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