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[errors] Add more info to "Invalid Hook Call" error page#8293

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rickhanlonii wants to merge 3 commits intoreactjs:mainfrom
rickhanlonii:rh/377
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[errors] Add more info to "Invalid Hook Call" error page#8293
rickhanlonii wants to merge 3 commits intoreactjs:mainfrom
rickhanlonii:rh/377

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@rickhanlonii rickhanlonii commented Feb 8, 2026

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Depends on #8291

We already have the infra to add a errors/{code}.md pages that gives more info about specific errors like why they happen and common causes/solutions. This will be especially useful for Agents that hit errors, so I'm going to use claude to start start creating these pages.

Screenshot 2026-02-08 at 5 41 55 PM

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github-actions bot commented Feb 8, 2026

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 115.05 KB (🟢 -37 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
/404 126.53 KB (🟡 +213 B) 241.59 KB
/500 126.54 KB (🟡 +213 B) 241.6 KB
/[[...markdownPath]] 128.98 KB (🟡 +213 B) 244.03 KB
/errors 126.8 KB (🟡 +224 B) 241.85 KB
/errors/[errorCode] 126.77 KB (🟡 +223 B) 241.83 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.


```js
import React from 'react';
console.log(React === window.React); // false means duplicates
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I think here we need a caveat, or further instruction, as in, you first need to identify where a different React version might be used. And assign that React version to window.React.

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