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The Wire · Showcase

JEST BUMPS BABEL TRANSFORM ACROSS E2E SUITES

By RepoJournal · Filed · About Meta

Jest's e2e test directories got a routine Babel plugin update — not urgent, but worth noting if you're running the latest from main.

The Jest team bumped @babel/plugin-transform-modules-systemjs across seven directories in a dependency maintenance pass [1]. This touches e2e/babel-plugin-jest-hoist and e2e/coverage-transform-instrumented among others — tooling directories, not the core Jest runtime. If you're consuming Jest as a dependency, this won't affect you. If you're running Jest from source or contributing to the project, it's a standard chore update that keeps the build pipeline in sync with upstream Babel changes.

Action items

References

  1. [1] chore(deps): bump the npm_and_yarn group across 7 directories with 1 update ↗ facebook/jest

FAQ

What changed in Meta on May 10, 2026?
Jest's e2e test directories got a routine Babel plugin update — not urgent, but worth noting if you're running the latest from main.
What should Meta teams do about it?
Review if you track Jest main branch closely — otherwise skip
Which Meta repositories shipped on May 10, 2026?
facebook/jest

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