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wire 2026-05-02
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JEST FINALLY SHIPS REQUIRE(ESM) — REACT NATIVE TIGHTENS ANDROID PLUMBING

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

SimenB JamieMagee renovate[bot]
3 people shipped this
SimenB @SimenB 2 cited JamieMagee @JamieMagee 1 cited renovate[bot] @renovate[bot] 1 cited

Jest landed the feature engineers have asked for since ESM landed: you can now require() ES modules directly, no more dual-build nightmares.

The Jest team shipped `require(esm)` support [1] after re-implementing ESM on top of Node's `linkRequests` APIs [2], unblocking the hybrid CommonJS/ESM workflows that have plagued monorepos for years. They also fixed a critical cross-realm constructor bug in `toStrictEqual` [3] that broke equality checks on every built-in type when using `structuredClone`, and bumped Babel to 8.0.0-rc.4 [4] to keep the test runner aligned with the next-gen transpiler. On the React Native front, the Android team consolidated image prefetch flags [5] into a single control, removing deprecated `enableImagePrefetchingJNIBatchingAndroid` and `enableImagePrefetchingOnUiThreadAndroid` — batching and UI thread dispatch now default to on. They also fixed ThreadSanitizer data races in the inspector layer [6] that caught the JS and main threads reading unsynchronized state, and are testing a memory-efficient view registry swap [7] using `MutableIntObjectMap` instead of `ConcurrentHashMap` to eliminate boxing overhead on Android. Event dispatch correctness landed too [8], ensuring the new EventTarget-based dispatcher honors the legacy `skipBubbling` flag.

Action items

References

  1. [1] feat: support `require(esm)` ↗ facebook/jest
  2. [2] chore: re-implement ESM support ↗ facebook/jest
  3. [3] fix(expect-utils): handle cross-realm constructors in toStrictEqual ↗ facebook/jest
  4. [4] chore(deps): update babel monorepo to v8.0.0-rc.4 ↗ facebook/jest
  5. [5] Consolidate image prefetch flags into enableImagePrefetchingAndroid (#56610) ↗ facebook/react-native
  6. [6] Fix TSAN data races in InspectorFlags and InspectorPackagerConnection (#56534) ↗ facebook/react-native
  7. [7] Use MutableIntObjectMap for SurfaceMountingManager view registry (#56646) ↗ facebook/react-native
  8. [8] Honor skipBubbling in the new EventTarget-based event dispatch (#56666) ↗ facebook/react-native

$ 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
Full archive → Weekly reviews →

Quick answers

What shipped in Meta on May 2, 2026?
Jest landed the feature engineers have asked for since ESM landed: you can now require() ES modules directly, no more dual-build nightmares. In total, 19 commits and 16 pull requests landed.
Who contributed to Meta on May 2, 2026?
3 developers shipped this update, including SimenB, JamieMagee, and renovate[bot].
What were the notable Meta updates?
feat: support `require(esm)`, chore: re-implement ESM support, and fix(expect-utils): handle cross-realm constructors in toStrictEqual.
♥

$ 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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