Who contributed to Meta on May 5, 2026?

2 developers shipped this update, including manthansubhash01 and renovate[bot].

What were the notable Meta updates?

Guard Scheduler deferred lambdas against delegate teardown (#56680), Add enableSchedulerDelegateInvalidation feature flag (#56678), and Support jest.config.mts.

JEST ADDS ESM CONFIG SUPPORT, REACT NATIVE PATCHES SCHEDULER MEMORY CORRUPTION

By RepoJournal · Filed 06:03 UTC on May 5, 2026 · About Meta

2 people shipped this

renovate[bot] @renovate[bot] 2 cited

manthansubhash01 @manthansubhash01 1 cited

Jest now accepts jest.config.mts for ESM-first TypeScript projects [ref:5], while React Native ships critical fixes for a delegate teardown race condition that could crash bridgeless apps [ref:1].

The Jest team resolved a friction point for ESM workflows by adding support for the .mts TypeScript ESM extension in configuration files [3]. This closes a gap where .mts projects were forced to use .ts or .js configs, losing explicit ESM signaling independent of package.json. Over on React Native, two complementary patches landed to address a memory safety issue in the Scheduler: one introduces a defensive feature flag [2] while the other defers lambda execution to prevent use-after-free when the SchedulerDelegate is torn down between enqueue and execution [1]. This is particularly critical for bridgeless implementations where RuntimeScheduler_Modern runs lambdas asynchronously. React Native also added synchronous mount props override test coverage [4] to shore up Android behavior. Dependency updates are rolling through Jest's test infrastructure, including @eslint/markdown 8.0 [5] and eslint-plugin-jsdoc 62.0 [6], along with a documentation fix for v30 migration guidance [7].

Action items

→ Apply React Native Scheduler fixes [ref:1][ref:2] to bridgeless implementations before next release facebook/react-native [immediate]
→ Upgrade Jest to next version with jest.config.mts support [ref:5] if using ESM-first TypeScript facebook/jest [plan]
→ Review eslint-plugin-jsdoc 62.0 breaking changes [ref:7] before updating CI facebook/jest [plan]

References

[1] Guard Scheduler deferred lambdas against delegate teardown (#56680) facebook/react-native
[2] Add enableSchedulerDelegateInvalidation feature flag (#56678) facebook/react-native
[3] Support jest.config.mts ↗ facebook/jest
[4] Add test for synchronous mount props override behavior (#56663) facebook/react-native
[5] chore(deps): update dependency @eslint/markdown to v8 ↗ facebook/jest
[6] chore(deps): update dependency eslint-plugin-jsdoc to v62 ↗ facebook/jest
[7] Fix link in v30 migration documentation (#16021) facebook/jest

Quick answers

What shipped in Meta on May 5, 2026?: Jest now accepts jest.config.mts for ESM-first TypeScript projects [ref:5], while React Native ships critical fixes for a delegate teardown race condition that could crash bridgeless apps [ref:1]. In total, 8 commits and 12 pull requests landed.
Who contributed to Meta on May 5, 2026?: 2 developers shipped this update, including manthansubhash01 and renovate[bot].
What were the notable Meta updates?: Guard Scheduler deferred lambdas against delegate teardown (#56680), Add enableSchedulerDelegateInvalidation feature flag (#56678), and Support jest.config.mts.

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