Uh oh!
There was an error while loading. Please reload this page.
Fix useDeferredValue getting stuck - #36134
Merged
Merged
Conversation
react-sizebot
commented
Mar 24, 2026
Comparing: ed69815...df5ef86 Critical size changesIncludes critical production bundles, as well as any change greater than 2%:
Significant size changesIncludes any change greater than 0.2%: (No significant changes) |
acdlite
approved these changes
Mar 24, 2026
acdlite
left a comment
Collaborator
There was a problem hiding this comment.
Nice! Is it a good or a bad thing that there was already a TODO that (sorta) described the issue 😆
Discussed out-of-band, writing here for posterity:
The TODO I think is still correct, we should generalize that special-error-to-unwind-the-stack trick thing that we use for selective hydration. The main benefit is that if you're mid render it can restart immediately instead of burning cycles on a work-in-progress render that will inevitably get thrown out regardless. Leaving for a future PR in case we were to accidentally introduce a new bug in the progress.
Uh oh!
There was an error while loading. Please reload this page.
github-actionsBot
pushed a commit
that referenced
this pull request
Mar 24, 2026
Fixes#35821 Written/debugged by Claude. ## Test Plan - Verify undoing the source fix fails the newly added test - Verify building a bundle with the fix solves https://github.com/gaearon/react-udv-bug/ repro DiffTrain build for [c0d218f](c0d218f)
github-actionsBot
pushed a commit
that referenced
this pull request
Mar 24, 2026
Fixes#35821 Written/debugged by Claude. ## Test Plan - Verify undoing the source fix fails the newly added test - Verify building a bundle with the fix solves https://github.com/gaearon/react-udv-bug/ repro DiffTrain build for [c0d218f](c0d218f)
3 tasks
github-actionsBot
pushed a commit
to code/lib-react
that referenced
this pull request
Mar 25, 2026
Fixesreact#35821 Written/debugged by Claude. ## Test Plan - Verify undoing the source fix fails the newly added test - Verify building a bundle with the fix solves https://github.com/gaearon/react-udv-bug/ repro DiffTrain build for [c0d218f](react@c0d218f)
github-actionsBot
pushed a commit
to code/lib-react
that referenced
this pull request
Mar 25, 2026
Fixesreact#35821 Written/debugged by Claude. ## Test Plan - Verify undoing the source fix fails the newly added test - Verify building a bundle with the fix solves https://github.com/gaearon/react-udv-bug/ repro DiffTrain build for [c0d218f](react@c0d218f)
This was referenced Mar 25, 2026
dhernz added a commit
to dhernz/watcher-protocol
that referenced
this pull request
May 1, 2026
- server.ts: viem-based USDC tipping on Base mainnet from EconomyOS-provisioned wallet - Claude reasoning step: agent decides tip amount or skip with one-line rationale - PagerDuty REST integration: fetch incidents, find linked PR, post note with tx hash - GitHub REST: PR author lookup - new endpoints: POST /demo/run · GET /api/agent · GET /api/fires - CORS so the frontend on :8765 can call the backend on :3001 - 03-my-watchers.html wired to the backend: live "Fire demo" button, real fire list, wallet balance stat - tip cap dropped to $0.03 USDC for cheap repeated demo runs Verified end-to-end: incident created → PR detected (react/react#36134, @gaearon) → Claude decided tip → on-chain tx 0x234771b5...3e26 on Base mainnet → note posted in PD.
y2ikgm89 added a commit
to y2ikgm89/myrrh-rental-space
that referenced
this pull request
Jul 31, 2026
…#1740) Next.js 16.3 changes `next/error`'s `ErrorInfo` shape twice over: `error` becomes `unknown` and `unstable_retry` is renamed to `retry`. All 34 `error.tsx` / `global-error.tsx` files imported `ErrorInfo` directly, so the bump would have had to touch every one of them in the same commit. Route them through `src/shared/lib/errors/error-boundary-props.ts` instead. `ErrorBoundaryProps` takes `error: unknown` with both retry props optional, so either version's `ErrorInfo` is assignable to it and Next's generated route type validation accepts the components on 16.2 and 16.3 alike. Upgrading then edits one file: make `retry` required and drop the fallback. Motivation: 16.3 carries the React fix for `useDeferredValue` getting stuck (react/react#36134), which is what leaves admin save buttons disabled on "保存中..." forever after a revalidating Server Action while the write itself succeeds (vercel/next.js#86055). Measured here on /admin/settings/features: Next 16.2.12 hangs 5/5, Next 16.3.0-preview.10 hangs 0/5. This commit deliberately does not bump `next` — 16.3.0 stable is unreleased. Co-authored-by: y2ikgm89 <y2ikgm89@users.noreply.github.com> Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
y2ikgm89 added a commit
to y2ikgm89/myrrh-rental-space
that referenced
this pull request
Aug 1, 2026
…pending hang (#1786) revalidate 付き Server Action の後にクライアントが RSC ペイロードを commit せず、 送信ボタンが pending のまま戻らない上流バグ（react/react#36134 / vercel/next.js#86055）の修正を取り込む。React core メンテナが 2026-07-03 に 「react#36134 で修正、16.3.0 で出る」と述べて issue を close しており、 **16.2.x への backport は無い**（v16.2.12 が 16.2 系の最終リリース）。 ## 本番の実害 admin がイベントを作成すると、実際は DB に作成できているのに「作成中...」の スピナーが戻らない。二重送信や再読込を誘発する。revalidate + redirect する admin mutation 全般が対象（スペース料金プラン更新でも同型を確認）。 ## 実測 production build で `events-create-online.spec.ts` を 10 回試行: | next | 失敗 | 所要時間 | | ------------------ | ------ | --------------- | | 16.2.12 | 2 / 10 | 2.8 〜 26.9 秒 | | 16.3.0-preview.10 | 0 / 10 | 2.6 〜 4.8 秒 | 失敗時もサーバーは 303 を 127〜170ms で返し切っており、クライアントが適用しない だけだった（POST 完了 → URL 反映は成功時 0.10〜0.26 秒 / 失敗時は 20 秒経っても 起きない二値）。 ## 広域 E2E の対照実験（#1783 適用後） | run | next | failed | flaky | passed | | ----------- | ------------------ | ------ | ----- | ------ | | 30686096541 | 16.2.12 | 1 | 1 | 325 | | 30686085976 | 16.3.0-preview.10 | 1 | 1 | 325 | 形が同一で回帰は見られない。hard failure は両方とも既存の `mypage-receipt-download`。flaky は互いに別 spec でどちらも初出のノイズ。 ## コスト **ソース変更ゼロ**。PR #1740 の `src/shared/lib/errors/error-boundary-props.ts` seam が 16.3 の `ErrorInfo` 破壊的変更を吸収済み。バンドルは -532 kB（-16.7%）。 stable ではなく preview を採る判断: 16.3.0 stable が未リリースである一方、 本番の実害が継続しているため。本番デプロイは workflow_dispatch のみなので merge しても自動では出ない。revert は package.json 1 行。 Co-authored-by: y2ikgm89 <y2ikgm89@users.noreply.github.com> Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
y2ikgm89 added a commit
to y2ikgm89/myrrh-rental-space
that referenced
this pull request
Aug 1, 2026
`package.json` pins `next` to `16.3.0-preview.10`, but the dependency pin table listed only Bun / TypeScript / Zod / Lexical, so nothing in the repo said this is a pre-release or that it is meant to be temporary. PR #1786 documented the reasoning well — upstream React `useDeferredValue` stuck bug (react/react#36134 / vercel/next.js#86055) leaving Server Action submit buttons permanently pending in production, fixed only in 16.3.0 with no 16.2 backport — but a merged PR body is not somewhere anyone looks. Without a pointer in the pin table, "switch back when 16.3.0 stable ships" has no owner. Renovate may well raise the stable bump on its own; this is the note that explains, at review time, why the exact pin was pre-release to begin with. Test plan: - bun scripts/prettier.ts --check CLAUDE.md: exit 0 - Documentation only; no code paths touched. Co-authored-by: y2ikgm89 <y2ikgm89@users.noreply.github.com> Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
justmadeid25 added a commit
to justmadeid25/senecial
that referenced
this pull request
Aug 6, 2026
Root cause: a confirmed upstream React/Next.js 16 bug (vercel/next.js#86055, fixed by react/react#36134 in Next 16.3.0) leaves useTransition's isPending permanently stuck whenever a Server Action invoked inside startTransition also triggers a router revalidation (revalidatePath and/or router.refresh). The follow-up RSC fetch is silently reported net::ERR_ABORTED with no console error, so the client never applies the update - confirmed via live browser console capture showing the action resolving successfully while the DOM stayed frozen. Upgraded next 16.2.12 -> 16.3.0 to pick up the fix, and removed the now- redundant client-side router.refresh() in the upload form (revalidatePath already refreshes the route from the action's own response). This unblocked two previously-hidden, unrelated bugs that only had a chance to run for the first time once the upload step stopped cascading-failing every serial test after it: - runExtractionWorker() (and any other test helper that shells out via `dotenv -e .env.e2e`) never received the run-specific tmp/e2e-storage/prod-{runId} directory the spawned server actually wrote uploads to, only .env.e2e's static default - same bug class as the already-fixed TEST_MAILBOX_DIR. Fixed by threading LOCAL_STORAGE_PATH into the Playwright process env in run-e2e-prod.ts. - A strict-mode Playwright locator matched two stacked toast notifications in extraction-flow.spec.ts; fixed with .last(). Verified: extraction-flow.spec.ts, ai-conversation-flow.spec.ts, and clause-intelligence-flow.spec.ts (the three specs that failed 100% reproducibly in the Phase 12.5 Linux CI comparison) all now pass cleanly without any per-component changes beyond the framework upgrade. Full local suite passed 101/101 twice consecutively. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
reiorozco added a commit
to reiorozco/next-supabase-take-home
that referenced
this pull request
Aug 14, 2026
La segunda navegación cliente consecutiva sobre /coffee-health actualizaba la URL pero dejaba el contenido congelado en el estado anterior, y los enlaces de los chips, calculados a partir de ese estado obsoleto, resucitaban filtros ya eliminados. El fallo es una regresión upstream, no del código de esta feature: se reproduce con AutoSubmit ausente del build, usando solo enlaces planos. Su origen es un bug de React canary (react/react#35821, corregido por react/react#36134 el 2026-03-24) que Next.js empaqueta internamente. El arreglo llegó a la línea canary via vercel/next.js#91905 pero nunca se retroportó a la rama estable 16.2: toda la línea 16.2.x, incluida la última versión 16.2.12, sigue empaquetando React 19.3.0-canary-3f0b9e61-20260317, anterior al arreglo. 16.3.x empaqueta 19.3.0-canary-cbb046ab-20260731, posterior. Se reporta en vercel/next.js#92152 y vercel/next.js#92787. Fija la versión de forma exacta en lugar de dejar el tag flotante "latest", para que el arreglo no se revierta de forma silenciosa en una instalación futura. react y react-dom no cambian: los rangos de peer dependencies de 16.3.1 son idénticos a los de 16.2.6.
This was referenced Aug 19, 2026
Merged
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for freeto join this conversation on GitHub.
Already have an account?
Sign in to comment
3 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Fixes#35821
Written/debugged by Claude.
Test Plan