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wire 2026-09-03
stories 40
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$ the-wire · showcase

Jest strips TS types sans transformer; React fixes DevTools release inputs

By RepoJournal · Filed · About Meta

Ruslan Lesiutin Matthew Costabile unstubbable Oskar Eichler Mad Dinh SimenB Jakub Piasecki
7 people shipped this
Ruslan Lesiutin @hoxyq 2 cited Matthew Costabile @mattcosta7 1 cited unstubbable @unstubbable 1 cited Oskar Eichler @OskarEichler 1 cited Mad Dinh @dennytosp 1 cited SimenB @SimenB 1 cited Jakub Piasecki @j-piasecki

Jest now strips TypeScript types from unclaimed files, while React addresses DevTools release reproducibility and Fizz import map security.

Jest's `ScriptTransformer` now runs `module.stripTypeScriptTypes()` on `.ts`, `.mts`, and `.cts` files when no transformer claims them, as Node's `node:vm` cannot parse TypeScript. This follows Node's extension-keyed approach on both CommonJS and ESM paths, with `transformIgnorePatterns` still honored [1]. The result: developers can run tests on type-only files without configuring a transformer, reducing setup overhead.

React DevTools builds become reproducible: `build-and-test.js` previously fed three different commits into one release, breaking Firefox's source review; it now requires a clean tree and resolves `HEAD` once [2]. Build dates, which varied by calendar, timezone, and locale, are removed from extension manifests, so AMO rebuilds can match uploaded zips [3]. These changes streamline the extension release process.

React's Fizz renderer now applies the script nonce to `importMap` server-rendered import maps, aligning them with nonce-based Content Security Policies [4]. Separately, Flight's debug info growth in development could exponentially multiply entries when deduplicating objects, leading to a `RangeError`; the fix prevents this by not copying debug info received from elsewhere [5]. React Native fixes include preserving queued frames in the Cxx WebSocket client before handshake and ensuring `Animated.Value`-derived nodes fire `addListener` for natively driven animations, a regression from 0.78 [6][7].

Action items

References

  1. [1] feat: strip TypeScript types when no transformer claims the file ↗ facebook/jest
  2. [2] [DevTools] Use one commit for extension release inputs (#37307) ↗ facebook/react
  3. [3] [DevTools] Remove build dates from extension manifests (#37306) ↗ facebook/react
  4. [4] [Fizz] Add `nonce` to rendered `import maps` (#37339) ↗ facebook/react
  5. [5] [Flight] Fix RangeError from exponential debug info growth (#37481) ↗ facebook/react
  6. [6] Fix Cxx WebSocket write queue state (#58201) ↗ facebook/react-native
  7. [7] Fix Animated listeners on nodes derived from Animated.Value (#58037) ↗ facebook/react-native

$ ls meta/reviews/ # the step-back reads

the week in review React Native sheds Paper-era internals the month in review React, React Native, and Jest harden the stack
Topics: JavaScript AI / ML Full archive →

Quick answers

What shipped in Meta on September 3, 2026?
Jest now strips TypeScript types from unclaimed files, while React addresses DevTools release reproducibility and Fizz import map security. In total, 31 commits and 9 pull requests landed.
Who contributed to Meta on September 3, 2026?
7 developers shipped this update, including Matthew Costabile, unstubbable, Ruslan Lesiutin, Oskar Eichler, Mad Dinh, Jakub Piasecki, and SimenB.
What were the notable Meta updates?
feat: strip TypeScript types when no transformer claims the file, [DevTools] Use one commit for extension release inputs (#37307), and [DevTools] Remove build dates from extension manifests (#37306).
♥

$ log Meta --recent

React Native adds Stable API guards to renderer attributed string 1 shipped React Native fixes bridgeless ordering and commits dev-machine paths 28 shipped React Native sheds Paper-era internals, stabilizes Maestro e2e 22 shipped React Compiler cuts allocations, Jest reverts moduleNameMapper regression 31 shipped

$ log --all # elsewhere on the wire

FastAPI & Pydantic Pydantic fixes Mypy plugin crash, tightens datetime constraints @laravel LSP skips diagnostics for interpolated strings

$ ls showcases/

Rails Django Laravel Node.js Go Vercel Vue.js Kubernetes HashiCorp Arch Linux Linux Anthropic

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