React Native: Memory and Architecture Cleanup

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Good morning. This is your React Native briefing for June 2nd, 2026.

The biggest story today is a major memory fix for Android developers. The team resolved out-of-memory crashes during large bundle downloads by eliminating intermediate buffer copies in the multipart stream reader. This change, merged in commit 57eb56f, directly addresses issue 52818 where large developer bundles would crash stock Android emulators during loading.

The second major theme is continued cleanup of legacy architecture code. Pull request 56831 removed all iOS code guarded by the legacy architecture flag, while several PRs deprecated and removed old APIs. The team removed InteractionManager entirely in PR 57026, pointing developers to use requestIdleCallback instead. They also deprecated NativeMethods interfaces in PR 57031 and removed legacy module stubs for AsyncStorage and other previously-removed components.

Several critical bug fixes landed as well. Pull request 57021 fixed a subtle animation bug where native-driven animations weren't syncing JavaScript values before completion callbacks, causing visual jumps when components re-rendered. On Android, PR 57029 fixed crashes in accessibility when empty arrays were passed to accessibilityLabelledBy.

The Yoga layout engine saw significant changes with CSS Flexbox automatic minimum sizing support in PR 57036, which had to be reverted and re-landed due to null pointer exceptions in progress bar and switch components.

Looking ahead, these memory improvements should reduce crash reports from teams with large bundles, while the API deprecations signal continued movement away from bridge-based architecture. The animation fix should eliminate a class of visual glitches that have likely been hard to debug.

That's your React Native update for today.