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The Wire · Showcase

TURBOPACK RUNTIME FIXES SHIP AS NEXT.JS LOCKS DOWN APP SHELL STREAMING

By RepoJournal · Filed · About Vercel

Sampoder eliminated a high-severity deoptimization in Turbopack's chunk URL resolution that was bailing out on large import trees, while the team shipped per-segment prefetch offsets to squeeze more performance out of static rendering.

The runtime fix [1] addressed a "wrong map" deopt in getChunkRelativeUrl that was firing on large fixtures with heavy imports, likely a common pattern in real applications. That same work unblocked the shell offset feature [2], which lets the client extract a shell response from a larger prerender response by reading a bytes offset during segment prefetching, matching the strategy already used at page level. Timneutkens added Vite-compatible caseSensitive support to import.meta.glob [3], letting developers toggle case-insensitive matching on directory traversal and patterns. Over on Eve, the team hardened documentation around the durable agent loop and sandbox boundary [4], linking execution model details to the security model to give developers a clear mental model of what runs where and how state divides.

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Action items

References

  1. [1] [turbopack] Fix de-opt in getChunkRelativeUrl() ↗ vercel/next.js
  2. [2] Add shell offset to static segment prefetches ↗ vercel/next.js
  3. [3] Turbopack: support import.meta.glob caseSensitive option ↗ vercel/next.js
  4. [4] docs: explain agent loop and sandbox boundary ↗ vercel/eve

Quick answers

What shipped in Vercel on July 27, 2026?
Sampoder eliminated a high-severity deoptimization in Turbopack's chunk URL resolution that was bailing out on large import trees, while the team shipped per-segment prefetch offsets to squeeze more performance out of static rendering. In total, 6 commits and 6 pull requests landed.
Who contributed to Vercel on July 27, 2026?
6 developers shipped this update, including sampoder, acdlite, timneutkens, ctgowrie, vercel-gh-bot-2[bot], and vercel-gh-bot-2.
What were the notable Vercel updates?
[turbopack] Fix de-opt in getChunkRelativeUrl(), Add shell offset to static segment prefetches, and Turbopack: support import.meta.glob caseSensitive option.

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