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@pull pull bot commented Jan 26, 2026

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dango0812 and others added 2 commits January 25, 2026 22:11
…ponents (#88985)

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## For Contributors

### Improving Documentation

- Run `pnpm prettier-fix` to fix formatting issues before opening the
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### Fixing a bug

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## For Maintainers

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### What?

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Closes NEXT-
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### What?
Add `useEffectEvent` to the list of invalid React APIs in Server
Components.

### Why?
Using `useEffectEvent` in a Server Component results in a **runtime
error**: TypeError: (0 , react_1.useEffectEvent) is not a function.
Without this fix, developers only discover the mistake at runtime. This
change improves the **Developer Experience (DX) by catching the error
immediately in the IDE.**

#### Expected Behavior
<img width="999" height="566" alt="image"
src="https://github.com/user-attachments/assets/79c1cbf9-ae0e-4ad7-b163-f650fb289a3a"
/>

#### Currently
<img width="1708" height="805" alt="image"
src="https://github.com/user-attachments/assets/a33f73e5-24fd-4405-826a-53f1810154a7"
/>
<img width="2091" height="812" alt="image"
src="https://github.com/user-attachments/assets/ed3f191e-a34d-42dd-8779-1d524f6f035d"
/>

### How?
- Added `useEffectEvent` to Rust RSC transform
(`react_server_components.rs`)
- Added `useEffectEvent` to TypeScript constants (`constant.ts`)
- Added `useEffectEvent` to error formatting (`format-server-error.ts`)
- Added test fixture and updated test file

## Note

This is a reapply of the previous
[PR](#88950).
With help from @timneutkens, I all previously worked code to ensure
nothing was missed before resubmitting.

Co-authored-by: Tim Neutkens <tim@timneutkens.nl>
@pull pull bot locked and limited conversation to collaborators Jan 26, 2026
@pull pull bot added the ⤵️ pull label Jan 26, 2026
@pull pull bot merged commit f4c2d54 into code:canary Jan 26, 2026
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