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⬆️ Update vitest monorepo to v4 (major) #6236

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@renovate renovate bot commented Oct 30, 2025

This PR contains the following updates:

Package Change Age Confidence
@vitest/coverage-v8 (source) ^3.0.9 -> ^4.0.5 age confidence
vitest (source) ^3.2.4 -> ^4.0.5 age confidence

Release Notes

vitest-dev/vitest (@​vitest/coverage-v8)

v4.0.5

Compare Source

   🐞 Bug Fixes
   🏎 Performance
    View changes on GitHub

v4.0.4

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   🐞 Bug Fixes
   🏎 Performance
    View changes on GitHub

v4.0.3

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   🐞 Bug Fixes
    View changes on GitHub

v4.0.2

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   🐞 Bug Fixes
    View changes on GitHub

v4.0.1

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   🐞 Bug Fixes
    View changes on GitHub

v4.0.0

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   🚨 Breaking Changes
   🚀 Features
   🐞 Bug Fixes
   🏎 Performance
    View changes on GitHub

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

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@renovate renovate bot requested a review from dubzzz as a code owner October 30, 2025 18:29
@renovate renovate bot added the dependencies Pull requests that update a dependency file label Oct 30, 2025
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changeset-bot bot commented Oct 30, 2025 •
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⚠️ No Changeset found

Latest commit: 5f209b2

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

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socket-security bot commented Oct 30, 2025 •
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Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff Package Supply Chain
Security		 Vulnerability Quality Maintenance License
Added@​docusaurus/​tsconfig@​3.8.11001005697100
Added@​vitest/​coverage-v8@​4.0.5991006999100
Added@​types/​npm-packlist@​7.0.3821006976100
Added@​types/​express@​5.0.51001007192100
Added@​types/​supertest@​6.0.31001007179100
Added@​docusaurus/​types@​3.8.11001007297100
Added@​types/​npmcli__arborist@​6.3.1991007479100
Added@​types/​jest@​30.0.01001007779100
Added@​typescript-eslint/​utils@​8.46.21001007796100
Added@​types/​lodash@​4.17.201001008082100
Addedcross-env@​10.1.010010010082100
Addedava@​6.4.19810010082100
Addedall-contributors-cli@​6.26.19910010083100
Addeddocusaurus-plugin-llms@​0.2.28310010088100
Added@​mdx-js/​react@​3.1.110010010083100
Added@​docusaurus/​theme-classic@​3.8.1991008497100
Added@​testing-library/​dom@​10.4.19910010086100
Added@​testing-library/​user-event@​14.6.110010010086100
Added@​testing-library/​react@​16.3.010010010087100
Added@​microsoft/​api-extractor@​7.53.3991008995100
Added@​npmcli/​arborist@​9.1.69810010094100
Added@​docusaurus/​remark-plugin-npm2yarn@​3.8.1951009899100
Added@​eslint/​js@​9.39.010010010096100

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@renovate renovate bot force-pushed the renovate/major-vitest-monorepo branch from 282f967 to bf78a5d Compare October 30, 2025 21:21
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@fast-check/examples

@fast-check/ava

npm i https://pkg.pr.new/@fast-check/ava@6236

@fast-check/expect-type

npm i https://pkg.pr.new/@fast-check/expect-type@6236

fast-check

npm i https://pkg.pr.new/fast-check@6236

@fast-check/jest

npm i https://pkg.pr.new/@fast-check/jest@6236

@fast-check/packaged

npm i https://pkg.pr.new/@fast-check/packaged@6236

@fast-check/poisoning

npm i https://pkg.pr.new/@fast-check/poisoning@6236

@fast-check/vitest

npm i https://pkg.pr.new/@fast-check/vitest@6236

@fast-check/worker

npm i https://pkg.pr.new/@fast-check/worker@6236

commit: 0b63a41

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@codyebberson codyebberson mentioned this pull request Oct 31, 2025
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github-actions bot and others added 3 commits November 1, 2025 06:41
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style: auto-format code with prettier
3e3d170 
  Applied by GitHub Action workflow: Format PR
  Run ID: 18992869395
  Target: branch 'renovate/major-vitest-monorepo'
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🔒 Regenerate pnpm-lock.yaml to resolve conflicts
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@dubzzz
Merge branch 'main' into renovate/major-vitest-monorepo
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dubzzz commented Nov 2, 2025

@copilot part of the test failures are linked to the error described here: https://vitest.dev/guide/migration.html#spyon-and-fn-support-constructors. could you fix them by relying on the class based mock

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Copilot AI commented Nov 2, 2025

@dubzzz I've opened a new pull request, #6259, to work on those changes. Once the pull request is ready, I'll request review from you.

@dubzzz
⬆️(vitest) Fix constructor mocks for v4 compatibility (#6259)
0b63a41 
Vitest v4 no longer supports using arrow functions in
`mockImplementation` for constructors (see [migration
guide](https://vitest.dev/guide/migration.html#spyon-and-fn-support-constructors)).

## Changes

- **Worker mocks**: Changed `Worker.mockImplementation(() => ({...}))`
to class-based mocks
- **Arbitrary constructor spies**: Replaced arrow functions with
`function` keyword in `mockImplementation` calls across 25 test files
- **Scheduler mocks**: Converted `mockReturnValue` to
`mockImplementation` for `SchedulerArbitrary` and `SchedulerImplem`
constructors

## Example

```typescript
// Before (v3)
const IntegerArbitrary = vi.spyOn(IntegerArbitraryMock, 'IntegerArbitrary');
IntegerArbitrary.mockImplementation(() => instance);

// After (v4)
const IntegerArbitrary = vi.spyOn(IntegerArbitraryMock, 'IntegerArbitrary');
IntegerArbitrary.mockImplementation(function() { return instance; } as any);
```

```typescript
// Before (v3)
Worker.mockImplementation(() => ({ on, postMessage, terminate }) as any);

// After (v4)
Worker.mockImplementation(class {
  on = on;
  postMessage = postMessage;
  terminate = terminate;
} as any);
```

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---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: dubzzz <[email protected]>
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👋 A preview of the new documentation is available at: http://69075aef65a796d7a6534843--dubzzz-fast-check.netlify.app

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