chore: use better `Thrower` declaration in tests #9884

Andarist · 2025-11-18T11:55:22Z

🎯 Changes

This is a test-only change to proactively fix what might be raised as an error in the future, see microsoft/TypeScript#55601 (comment)

✅ Checklist

I have followed the steps in the Contributing guide.
I have tested this code locally with pnpm run test:pr.

🚀 Release Impact

This change affects published code, and I have generated a changeset.
This change is docs/CI/dev-only (no release).

Summary by CodeRabbit

Tests
- Improved type safety in testing infrastructure to ensure better validation and code reliability.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

changeset-bot · 2025-11-18T11:55:26Z

⚠️ No Changeset found

Latest commit: 1ec8328

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

nx-cloud · 2025-11-18T11:55:50Z

🤖 Nx Cloud AI Fix Eligible

An automatically generated fix could have helped fix failing tasks for this run, but Self-healing CI is disabled for this workspace. Visit workspace settings to enable it and get automatic fixes in future runs.

_{To disable these notifications, a workspace admin can disable them in workspace settings.}

View your CI Pipeline Execution ↗ for commit 1ec8328

Command	Status	Duration	Result
`nx affected --targets=test:sherif,test:knip,tes...`	❌ Failed	5m 44s	View ↗
`nx run-many --target=build --exclude=examples/*...`	✅ Succeeded	16s	View ↗

☁️ Nx Cloud last updated this comment at 2025-11-23 09:35:37 UTC

TkDodo

❤️

coderabbitai · 2025-11-23T09:29:10Z

Walkthrough

The Thrower function in the HydrationBoundary test is now explicitly typed to return never, removing a ts-expect-error workaround and its null return statement while maintaining identical runtime behavior.

Changes

Cohort / File(s)	Summary
Test type signature refinement `packages/react-query/src/__tests__/HydrationBoundary.test.tsx`	Explicit `never` return type added to `Thrower` function; removed `ts-expect-error` comment and dead null return path to tighten TypeScript typing

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Isolated test utility function change with no runtime implications
Type-only refinement in a single test file

Poem

🐰 A thrower that never returns to stay,
No more workarounds to chase away,
Types now precise, the promise shall fly,
Never returning—just reaching the sky!

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run `@coderabbitai generate docstrings` to improve docstring coverage.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: improving the Thrower declaration in tests with better TypeScript typing.
Description check	✅ Passed	The description follows the template structure with all required sections completed, including motivation (proactive TypeScript fix), checklist items marked, and release impact properly assessed.

✨ Finishing touches

📝 Generate docstrings

🧪 Generate unit tests (beta)

Create PR with unit tests
Post copyable unit tests in a comment

📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between ae47807 and 1ec8328.

📒 Files selected for processing (1)

packages/react-query/src/__tests__/HydrationBoundary.test.tsx (1 hunks)

🧰 Additional context used

🧠 Learnings (1)

📓 Common learnings

Learnt from: sukvvon
Repo: TanStack/query PR: 9892
File: packages/solid-query-persist-client/src/__tests__/PersistQueryClientProvider.test.tsx:331-335
Timestamp: 2025-11-22T09:06:05.219Z
Learning: In TanStack/query test files, when a queryFn contains side effects (e.g., setting flags for test verification), prefer async/await syntax for clarity; when there are no side effects, prefer the .then() pattern for conciseness.

Learnt from: justjake
Repo: TanStack/query PR: 9589
File: packages/query-core/src/queryCache.ts:132-146
Timestamp: 2025-08-25T19:16:59.365Z
Learning: The TypeScript pattern `t satisfies never` in a switch statement's default case is valid for exhaustiveness checking when all possible values of a union type are handled in the switch cases. For `typeof` operations, this ensures all 8 possible return values are covered: "string", "number", "bigint", "boolean", "symbol", "undefined", "object", "function".

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (2)

GitHub Check: Preview
GitHub Check: Test

🔇 Additional comments (1)

packages/react-query/src/__tests__/HydrationBoundary.test.tsx (1)

214-218: LGTM! Clean proactive fix for future TypeScript compatibility.

The explicit : never return type correctly captures that this function always throws and never returns normally. Removing the ts-expect-error workaround improves type safety and aligns with upcoming TypeScript behavior referenced in the PR objectives.

Verification confirms that Thrower is the only function in the test suite that throws a Promise, so this is a uniquely targeted fix with no other similar patterns requiring updates.

Tip

📝 Customizable high-level summaries are now available in beta!

You can now customize how CodeRabbit generates the high-level summary in your pull requests — including its content, structure, tone, and formatting.

Provide your own instructions using the high_level_summary_instructions setting.
Format the summary however you like (bullet lists, tables, multi-section layouts, contributor stats, etc.).
Use high_level_summary_in_walkthrough to move the summary from the description to the walkthrough section.

Example instruction:

"Divide the high-level summary into five sections:

📝 Description — Summarize the main change in 50–60 words, explaining what was done.

📓 References — List relevant issues, discussions, documentation, or related PRs.

📦 Dependencies & Requirements — Mention any new/updated dependencies, environment variable changes, or configuration updates.

📊 Contributor Summary — Include a Markdown table showing contributions:
| Contributor | Lines Added | Lines Removed | Files Changed |

✔️ Additional Notes — Add any extra reviewer context.
Keep each section concise (under 200 words) and use bullet or numbered lists for clarity."

Note: This feature is currently in beta for Pro-tier users, and pricing will be announced later.

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

pkg-pr-new · 2025-11-23T09:30:40Z

More templates

@tanstack/angular-query-experimental

npm i https://pkg.pr.new/@tanstack/angular-query-experimental@9884

@tanstack/eslint-plugin-query

npm i https://pkg.pr.new/@tanstack/eslint-plugin-query@9884

@tanstack/query-async-storage-persister

npm i https://pkg.pr.new/@tanstack/query-async-storage-persister@9884

@tanstack/query-broadcast-client-experimental

npm i https://pkg.pr.new/@tanstack/query-broadcast-client-experimental@9884

@tanstack/query-core

npm i https://pkg.pr.new/@tanstack/query-core@9884

@tanstack/query-devtools

npm i https://pkg.pr.new/@tanstack/query-devtools@9884

@tanstack/query-persist-client-core

npm i https://pkg.pr.new/@tanstack/query-persist-client-core@9884

@tanstack/query-sync-storage-persister

npm i https://pkg.pr.new/@tanstack/query-sync-storage-persister@9884

@tanstack/react-query

npm i https://pkg.pr.new/@tanstack/react-query@9884

@tanstack/react-query-devtools

npm i https://pkg.pr.new/@tanstack/react-query-devtools@9884

@tanstack/react-query-next-experimental

npm i https://pkg.pr.new/@tanstack/react-query-next-experimental@9884

@tanstack/react-query-persist-client

npm i https://pkg.pr.new/@tanstack/react-query-persist-client@9884

@tanstack/solid-query

npm i https://pkg.pr.new/@tanstack/solid-query@9884

@tanstack/solid-query-devtools

npm i https://pkg.pr.new/@tanstack/solid-query-devtools@9884

@tanstack/solid-query-persist-client

npm i https://pkg.pr.new/@tanstack/solid-query-persist-client@9884

@tanstack/svelte-query

npm i https://pkg.pr.new/@tanstack/svelte-query@9884

@tanstack/svelte-query-devtools

npm i https://pkg.pr.new/@tanstack/svelte-query-devtools@9884

@tanstack/svelte-query-persist-client

npm i https://pkg.pr.new/@tanstack/svelte-query-persist-client@9884

@tanstack/vue-query

npm i https://pkg.pr.new/@tanstack/vue-query@9884

@tanstack/vue-query-devtools

npm i https://pkg.pr.new/@tanstack/vue-query-devtools@9884

commit: 1ec8328

chore: use better Thrower declaration in tests

3efeb8f

github-actions bot added the package: react-query label Nov 18, 2025

TkDodo approved these changes Nov 23, 2025

View reviewed changes

Merge branch 'main' into fix/thrower

1ec8328

TkDodo merged commit c9bc600 into TanStack:main Nov 23, 2025
6 of 7 checks passed

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Uh oh!

Uh oh!

chore: use better `Thrower` declaration in tests #9884

chore: use better `Thrower` declaration in tests #9884

Uh oh!

Andarist commented Nov 18, 2025 •

edited by coderabbitai bot

Loading

Uh oh!

changeset-bot bot commented Nov 18, 2025 •

edited

Loading

Uh oh!

nx-cloud bot commented Nov 18, 2025 •

edited

Loading

Uh oh!

TkDodo left a comment

Uh oh!

coderabbitai bot commented Nov 23, 2025 •

edited

Loading

Uh oh!

pkg-pr-new bot commented Nov 23, 2025

Uh oh!

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

2 participants

Uh oh!

chore: use better Thrower declaration in tests #9884

chore: use better Thrower declaration in tests #9884

Uh oh!

Conversation

Andarist commented Nov 18, 2025 • edited by coderabbitai bot Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

🎯 Changes

✅ Checklist

🚀 Release Impact

Summary by CodeRabbit

Uh oh!

changeset-bot bot commented Nov 18, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

⚠️ No Changeset found

Uh oh!

nx-cloud bot commented Nov 18, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

🤖 Nx Cloud AI Fix Eligible

Uh oh!

TkDodo left a comment

Choose a reason for hiding this comment

Uh oh!

coderabbitai bot commented Nov 23, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Walkthrough

Changes

Estimated code review effort

Poem

Pre-merge checks and finishing touches

Uh oh!

pkg-pr-new bot commented Nov 23, 2025

Uh oh!

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

2 participants

chore: use better `Thrower` declaration in tests #9884

chore: use better `Thrower` declaration in tests #9884

Andarist commented Nov 18, 2025 •

edited by coderabbitai bot

Loading

changeset-bot bot commented Nov 18, 2025 •

edited

Loading

nx-cloud bot commented Nov 18, 2025 •

edited

Loading

coderabbitai bot commented Nov 23, 2025 •

edited

Loading