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Sync with react.dev @ 8efce785 - #242

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rammba merged 5 commits into
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sync-8efce785
Sep 14, 2026
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rammba merged 5 commits into
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sync-8efce785

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This PR was automatically generated.

Merge changes from react.dev at 8efce78

DO NOT SQUASH MERGE THIS PULL REQUEST!

Doing so will "erase" the commits from main and cause them to show up as conflicts the next time we merge.

aurorascharff and others added 5 commits September 8, 2026 15:00
* Validate inline code highlights in docs

* Match MDX code highlight metadata parsing
* Clarify standalone startTransition error handling

* Polish startTransition error handling docs

* Describe startTransition differences neutrally

* Clarify startTransition callback wording

* Remove repeated startTransition caveat

* Preserve existing startTransition guidance

* Preserve useTransition error guidance

* Update src/content/reference/react/useTransition.md

Co-authored-by: Sebastian "Sebbie" Silbermann <silbermann.sebastian@gmail.com>

* Clarify standalone startTransition error reporting

---------

Co-authored-by: Sebastian "Sebbie" Silbermann <silbermann.sebastian@gmail.com>
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Size changes

Details

📦 Next.js Bundle Analysis for react-dev

This analysis was generated by the Next.js Bundle Analysis action. 🤖

🎉 Global Bundle Size Decreased

Page Size (compressed)
global 115.15 KB (-1 B)
Details

The global bundle is the javascript bundle that loads alongside every page. It is in its own category because its impact is much higher - an increase to its size means that every page on your website loads slower, and a decrease means every page loads faster.

Any third party scripts you have added directly to your app using the <script> tag are not accounted for in this analysis

If you want further insight into what is behind the changes, give @next/bundle-analyzer a try!

Five Pages Changed Size

The following pages changed size from the code in this PR compared to its base branch:

Page Size (compressed) First Load
/404 127.67 KB (🟡 +22 B) 242.82 KB
/500 127.68 KB (🟡 +22 B) 242.83 KB
/[[...markdownPath]] 130.13 KB (🟡 +10 B) 245.27 KB
/errors 127.93 KB (🟡 +22 B) 243.08 KB
/errors/[errorCode] 127.9 KB (🟡 +22 B) 243.05 KB
Details

Only the gzipped size is provided here based on an expert tip.

First Load is the size of the global bundle plus the bundle for the individual page. If a user were to show up to your website and land on a given page, the first load size represents the amount of javascript that user would need to download. If next/link is used, subsequent page loads would only need to download that page's bundle (the number in the "Size" column), since the global bundle has already been downloaded.

Any third party scripts you have added directly to your app using the <script> tag are not accounted for in this analysis

Next to the size is how much the size has increased or decreased compared with the base branch of this PR. If this percentage has increased by 10% or more, there will be a red status indicator applied, indicating that special attention should be given to this.

@rammba
rammba merged commit 34338f7 into main Sep 14, 2026
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@rammba
rammba deleted the sync-8efce785 branch September 14, 2026 14:25
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4 participants