Test: Migrate Node unit tests to Vitest

[ciampo]

What?

Part of #80855.

Follows #82210.

Migrate deterministic Node unit tests from Jest to Vitest. This also adds the direct workspace dependencies and shared runner configuration used by the following jsdom migration.

jsdom tests and their Jest-only dependencies stay on Jest until the next PR in this stack.

Why?

Separating Node and jsdom tests keeps the migration reviewable and leaves DOM-specific setup out of this layer.

How?

Note

This is a large PR, but 99% of the changes are mechanical.
If reviewers feel strongly about the PR size being too large, I could split it into 3/4 PRs (or more).

Route the migrated Node tests through Vitest, convert Jest imports and mocks, preserve the remaining Jest test route and its package dependencies, and declare project matchers through Vitest's Matchers interface.

Follow-up cleanup

• Test: Publish Vitest tooling and switch wp-scripts #80998 will make @wordpress/vitest-console own the console matcher implementation and types.

Testing Instructions

1. Run npm run --workspace @wordpress/unit-tests test:unit:routing.
2. Run npm run --workspace @wordpress/unit-tests test:unit:conventions.
3. Run npm run test:unit:vitest -- --project=node.
4. Run npm run test:unit -- --runInBand --shard=1/4 through --shard=4/4.
5. Run npm run typecheck.

Testing Instructions for Keyboard

Not applicable; this PR does not change the UI.

Use of AI Tools

Codex helped split, verify, and document the changes. I reviewed the result.

[github-actions]

Size Change: 0 B

Total Size: 7.91 MB

_{compressed-size-action}

[github-actions]

Flaky tests detected in 0c78ff1.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/33405341092
📝 Reported tests:

two users concurrently move list items (RTC WebSocket) in /test/e2e/specs/editor/collaboration/collaboration-stress.spec.ts, passed after 1 failed attempt.

TimeoutError: locator.click: Timeout 10000ms exceeded.
Call log:
  - waiting for locator('role=toolbar[name="Block tools"i]').locator('role=button[name="Move up"i]')
    - locator resolved to <button id=":rq:" type="button" tabindex="-1" aria-label="Move up" data-toolbar-item="true" aria-describedby="block-editor-block-mover-button__description-0" class="components-button block-editor-block-mover-button is-up-button is-next-40px-default-size has-icon">…</button>
  - attempting click action
    - waiting for element to be visible, enabled and stable
    - element is visible, enabled and stable
    - scrolling into view if needed
  - element was detached from the DOM, retrying

    at /home/runner/work/gutenberg/gutenberg/test/e2e/specs/editor/collaboration/collaboration-stress.spec.ts:623:7
    at /home/runner/work/gutenberg/gutenberg/test/e2e/specs/editor/collaboration/collaboration-stress.spec.ts:602:3

[github-actions]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

If you're merging code through a pull request on GitHub, copy and paste the following into the bottom of the merge commit message.

Co-authored-by: ciampo <mciampini@git.wordpress.org>
Co-authored-by: manzoorwanijk <manzoorwanijk@git.wordpress.org>

To understand the WordPress project's expectations around crediting contributors, please review the Contributor Attribution page in the Core Handbook.

[manzoorwanijk]

Given the size of the PR, I relied fully on the AI review for this.

[Copilot]

Pull request overview

Migrates deterministic Node unit tests from Jest to Vitest while retaining Jest for jsdom tests.

Changes:

• Adds explicit Vitest imports, mocks, matcher types, and snapshots.
• Routes Node tests through shared Vitest configuration and CI.
• Adds direct Vitest workspace dependencies while preserving jsdom’s Jest dependencies.

Reviewed changes

Copilot reviewed 298 out of 639 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
Node test files and snapshots	Migrates test APIs and expected snapshots to Vitest.
Workspace manifests and lockfile	Declares consistent direct Vitest dependencies.
test/unit/*	Configures routing, setup, conventions, and matcher types.
test/integration/*	Supports both transitional Jest and Vitest timers.
tools/eslint/config.mjs	Applies test linting to migrated Node tests.
packages/jest-console/*	Preserves console spies and supports Vitest-driven tests.
.github/workflows/*, bin/unit-test-date.sh	Runs migrated tests through Vitest in CI.

---

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[github-actions]

🤖 PR meta 🤖

📦 Bundle size

Size Change: 0 B

Total Size: 7.91 MB

_{96d135f Run}

⚡ Performance

Show the results

Client side metrics exclude the server response time.

front-end-block-theme

Metric	b426d73	trunk	% Change
timeToFirstByte	63.7 ms +8.56% -11.07%	64.6 ms +3.87% -12.62%	-1.39%
largestContentfulPaint	98 ms +10.2% -10.2%	96 ms +6.25% -4.17%	2.08%
lcpMinusTtfb	33.3 ms +24.62% -6.16%	31.45 ms +12.56% -5.72%	5.88%
wpBeforeTemplate	33.22 ms +4.52% -17.94%	33.27 ms +2.68% -19.3%	-0.15%
wpTemplate	25.82 ms +4.92% -1.55%	26.06 ms +6.18% -1.84%	-0.92%
wpTotal	59.14 ms +7.1% -10.99%	59.65 ms +4.06% -11.77%	-0.85%
wpMemoryUsage	7.54 MB +0% -0%	7.50 MB +0% -0%	0.46%
wpDbQueries	17 +0% -0%	17 +0% -0%	0%

front-end-classic-theme

Metric	b426d73	trunk	% Change
timeToFirstByte	50.55 ms +11.47% -9.2%	51.5 ms +7.96% -8.54%	-1.84%
largestContentfulPaint	98 ms +4.08% -6.12%	100 ms +0% -8%	-2%
lcpMinusTtfb	45.75 ms +1.75% -3.39%	45.15 ms +4.43% -1.66%	1.33%
wpBeforeTemplate	25.77 ms +23.55% -8.07%	27.33 ms +14.23% -12.04%	-5.71%
wpTemplate	19.77 ms +4.96% -2.88%	20.08 ms +3.44% -1.99%	-1.54%
wpTotal	47.14 ms +10.78% -9.06%	47.93 ms +7.89% -8.49%	-1.65%
wpMemoryUsage	6.16 MB +0% -0%	6.12 MB +0% -0%	0.58%
wpDbQueries	14 +0% -0%	14 +0% -0%	0%

media-processing

Metric	b426d73	trunk	% Change
mediaProcessingJpeg	410.77 ms +0.08% -0.42%	410 ms +0.56% -0.7%	0.19%
mediaProcessingAvif	6385.85 ms +0.76% -0.14%	6385.81 ms +0.21% -0.1%	0%
mediaProcessingJpegToAvif	4569.78 ms +0.26% -0.13%	4558.41 ms +0.26% -0.03%	0.25%

media-upload

Metric	b426d73	trunk	% Change
jpegUploadProcessing	1439.78 ms +34.65% -1.27%	1431.65 ms +1% -1.3%	0.57%
pngUploadProcessing	202.86 ms +2.26% -3.25%	204.36 ms +5.27% -3.12%	-0.73%
largeJpegUploadProcessing	1405.01 ms +1.42% -0.6%	1413.09 ms +1.26% -1.02%	-0.57%
multipleImageUploadProcessing	1547.14 ms +0.78% -1.13%	1551.02 ms +0.71% -1.58%	-0.25%

post-editor

Metric	b426d73	trunk	% Change
serverResponse	519.55 ms +4.74% -5.18%	558.37 ms +2.36% -9.15%	-6.95%
firstPaint	239.65 ms +17.61% -9.81%	228.42 ms +5.24% -7.21%	4.92%
domContentLoaded	1281.5 ms +0.66% -0.97%	1285.52 ms +0.28% -0.24%	-0.31%
loaded	1282.8 ms +0.66% -0.98%	1286.79 ms +0.27% -0.26%	-0.31%
firstContentfulPaint	433.46 ms +2.32% -2.42%	432.46 ms +1.33% -2.04%	0.23%
firstBlock	3500.71 ms +1.65% -1.28%	3550.88 ms +0.2% -0.49%	-1.41%
type	19.36 ms +7.39% -20.2%	19.21 ms +14.63% -25.46%	0.78%
typeWithoutInspector	18.91 ms +14.17% -15.02%	18.91 ms +8.51% -15.86%	0%
typeWithTopToolbar	23.41 ms +11.19% -12.09%	23.4 ms +11.79% -18.03%	0.04%
typeContainer	8.71 ms +11.48% -7.35%	8.97 ms +9.03% -5.35%	-2.9%
focus	76.37 ms +22.98% -7.02%	76.89 ms +18.47% -5.29%	-0.68%
firstFocus	167.5 ms +0% -0%	160.59 ms +0% -0%	4.3%
selectAll	590.03 ms +1.58% -0.12%	587.98 ms +2.52% -1.04%	0.35%
listViewOpen	64.95 ms +19.45% -8.38%	67.1 ms +8.29% -8.88%	-3.2%
inserterOpen	21.4 ms +13.64% -12.29%	20.56 ms +15.42% -9.58%	4.09%
inserterHover	3.44 ms +11.05% -9.01%	3.46 ms +11.85% -14.16%	-0.58%
inserterSearch	7.21 ms +14.56% -4.85%	7.6 ms +17.11% -14.61%	-5.13%
loadPatterns	613.05 ms +5.84% -5%	636.04 ms +1.66% -1.96%	-3.61%
wpTotal	508.58 ms +5.04% -5.06%	548.27 ms +2.34% -9.27%	-7.24%
wpMemoryUsage	13.13 MB +0% -0%	13.10 MB +0% -0%	0.22%
wpDbQueries	54 +0% -1.85%	54 +0% -1.85%	0%

site-editor

Metric	b426d73	trunk	% Change
serverResponse	298.84 ms +10.74% -1.22%	298.96 ms +6.45% -4.24%	-0.04%
firstPaint	197.97 ms +36.91% -15.39%	204.1 ms +46.06% -13.56%	-3%
domContentLoaded	1004.7 ms +4.02% -0.94%	956.52 ms +3.32% -1.99%	5.04%
loaded	1005.76 ms +3.99% -0.94%	957.35 ms +3.31% -1.99%	5.06%
firstContentfulPaint	312.37 ms +3.19% -1.34%	316.49 ms +3.45% -4.19%	-1.3%
firstBlock	3119.07 ms +1.41% -0.13%	2946.52 ms +0.87% -3.63%	5.86%
type	19.18 ms +13.56% -22.42%	15.93 ms +4.9% -17.26%	20.4%
navigate	80.52 ms +12.58% -11.14%	89.28 ms +5.81% -17.06%	-9.81%
loadPatterns	1062.9 ms +7.56% -1.99%	1057.07 ms +22.75% -9.69%	0.55%
loadPages	1055.75 ms +5.22% -0.94%	1122.71 ms +4.71% -7.65%	-5.96%
wpTotal	291.64 ms +10.9% -1.28%	291.91 ms +6.16% -4.39%	-0.09%
wpMemoryUsage	12.02 MB +0% -0%	11.99 MB +0% -0%	0.3%
wpDbQueries	44 +0% -2.27%	44 +0% -2.27%	0%

_{96d135f Run}

[Copilot]

Pull request overview

Copilot reviewed 298 out of 644 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 298 out of 644 changed files in this pull request and generated 1 comment.

[ciampo]

@aduth looks like copilot is picking up repo skills while reviewing 🎉

[ciampo]

Added an isolated real-Jest subprocess test for jest.restoreAllMocks() in 7f81705, then made it load the source entry through the repository transformer in c192bc3

[Copilot]

Pull request overview

Copilot reviewed 298 out of 646 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 298 out of 646 changed files in this pull request and generated 1 comment.

[manzoorwanijk]

Looks good to me now. Thank you for this effort.