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Topics: JavaScript AI / ML Full archive →

The Wire · Showcase

REACT SERVER DOM TURBOPACK GETS DYNAMIC CHUNK MERGING

By RepoJournal · Filed · About Meta

Sam Poder timneutkens Alex Hunt Mathieu Acthernoene
4 people shipped this
Sam Poder @sampoder 1 cited timneutkens @timneutkens 1 cited Alex Hunt @huntie 1 cited Mathieu Acthernoene @zoontek 1 cited

React's Turbopack integration now supports an experimental array format that lets you dynamically merge or unmerge chunks based on what's already loaded in the browser.

The new chunk format [1] introduces a union type that pairs chunk URLs with metadata about path dependencies and loaded chunks, enabling smarter bundling decisions at runtime. This is the foundation work behind Next.js's forthcoming optimization [1], which will let frameworks ship fewer bytes by consolidating chunks intelligently. Meanwhile, React's Flight layer got a performance boost [2] that caps development stack traces at 10 frames during JSX call site reconstruction, cutting overhead for teams relying on detailed error context. On React Native, the team dropped the chrome-launcher dependency [3] after Expo flagged it as a papercut, removing duplicate code and lightening the core package. The same team also fixed Android RTL direction detection [4] to read from the active device locale instead of an arbitrary system locale, solving a layout bug that affected internationalized apps.

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Action items

References

  1. [1] [react-server-dom-turbopack] Support experimental array format for chunks (#37095) facebook/react
  2. [2] [Flight] Limit fake JSX call site stacks to 10 frames (#37086) facebook/react
  3. [3] Drop chrome-launcher dependency (#57630) facebook/react-native
  4. [4] fix(android): use the active locale to detect RTL direction (#57635) facebook/react-native

Quick answers

What shipped in Meta on July 23, 2026?
React's Turbopack integration now supports an experimental array format that lets you dynamically merge or unmerge chunks based on what's already loaded in the browser. In total, 14 commits and 2 pull requests landed.
Who contributed to Meta on July 23, 2026?
4 developers shipped this update, including Sam Poder, timneutkens, Alex Hunt, and Mathieu Acthernoene.
What were the notable Meta updates?
[react-server-dom-turbopack] Support experimental array format for chunks (#37095), [Flight] Limit fake JSX call site stacks to 10 frames (#37086), and Drop chrome-launcher dependency (#57630).

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