Who contributed to Meta on August 9, 2026?

3 developers shipped this update, including JasonColapietro, avivkeller, and KirtiRamchandani.

What were the notable Meta updates?

fix(jest-resolve): isolate virtual mock module IDs, fix(cjs-esm-interop): support `module.exports` in ESM, and fix(jest-haste-map): tolerate transient EPERM in the watcher lstat.

JEST FIXES MODULE CACHING BUG THAT BREAKS VIRTUAL MOCKS

By RepoJournal · Filed 06:57 UTC on August 9, 2026 · About Meta

3 people shipped this

JasonColapietro @JasonColapietro 2 cited

avivkeller @avivkeller 1 cited

KirtiRamchandani @KirtiRamchandani

Jest's resolver was silently losing track of virtual mock state, causing test isolation failures and cache collisions across parallel workers.

The core issue: `Resolver._moduleIDCache` keyed lookups by importer, module, and options, but omitted whether that specific lookup was registered as a virtual mock [1]. That meant two different virtual mock states could collide in the cache, breaking test isolation. JasonColapietro's fix includes each requested module's virtual-mock state in the cache key itself, plus a two-suite end-to-end regression that runs both test files in one worker to lock in the fix [1]. On the interop front, Jest now correctly handles ESM exports like `export { myVariable as "module.exports" }` to match Node's CommonJS compatibility layer [2]. Meanwhile, watch mode on Windows was crashing when `git maintenance` or other processes held file locks, surfacing as `EPERM` errors that Jest couldn't tolerate [3]. The watcher now treats `EPERM` on Windows the same way it treats `ENOENT` anywhere else: recoverable and survivable [3]. React Native continues mechanically converting Objective-C push notification and image store modules to TurboModule specs, with hand-reconciliation of type mismatches along the way [4] [5].

Action items

→ Pull Jest main to catch the virtual mock cache isolation fix before your next test run facebook/jest [immediate]
→ Monitor Windows watch mode stability; the EPERM tolerance fix is in flight facebook/jest [monitor]
→ Plan React Native upgrade when TurboModule conversions land; manual type reconciliation is complete facebook/react-native [plan]

References

[1] fix(jest-resolve): isolate virtual mock module IDs ↗ facebook/jest
[2] fix(cjs-esm-interop): support `module.exports` in ESM ↗ facebook/jest
[3] fix(jest-haste-map): tolerate transient EPERM in the watcher lstat ↗ facebook/jest
[4] xplat/js/react-native-github/packages/react-native/Libraries/PushNotificationIOS/RCTPushNotificationManager.mm (#57833) facebook/react-native
[5] xplat/js/react-native-github/packages/react-native/Libraries/Image/RCTImageStoreManager.mm (#57842) facebook/react-native

Quick answers

What shipped in Meta on August 9, 2026?: Jest's resolver was silently losing track of virtual mock state, causing test isolation failures and cache collisions across parallel workers. In total, 12 commits and 8 pull requests landed.
Who contributed to Meta on August 9, 2026?: 3 developers shipped this update, including JasonColapietro, avivkeller, and KirtiRamchandani.
What were the notable Meta updates?: fix(jest-resolve): isolate virtual mock module IDs, fix(cjs-esm-interop): support `module.exports` in ESM, and fix(jest-haste-map): tolerate transient EPERM in the watcher lstat.

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