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.

JEST FINALLY SHIPS REQUIRE(ESM) — REACT NATIVE TIGHTENS ANDROID PLUMBING

By RepoJournal · Filed 06:02 UTC on May 2, 2026 · About Meta

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

→ Test Jest with `require(esm)` in your monorepo — this unblocks hybrid workflows you've likely worked around facebook/jest [plan]
→ Review React Native image prefetch consolidation if you're using `enableImagePrefetchingAndroid` — behavior is now defaulted-on facebook/react-native [monitor]
→ Update to latest Jest for the `toStrictEqual` cross-realm fix if your tests use `structuredClone` with built-in types facebook/jest [plan]

References

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

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.

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