Unit Tests: Reorganise the jest config file.

[manzoorwanijk]

What?

Follow-up to #80765 (comment)

Some changes extracted from the isolated mode PR #75814

This PR updates the unit-test Jest configuration so module resolution works with isolated dependency installs as well as the default install layout. It also reorganizes moduleNameMapper and makes the list of dependencies transformed by Jest easier to maintain.

Why?

The Ariakit mappings added in #80765 point directly to the root node_modules directory. Workspace-only dependencies are not available there when dependencies are installed in isolation, so Jest cannot resolve those modules.

Some other parts of the configuration also rely on hoisted dependencies or mapper ordering. Specific mappings need to be evaluated before generic @wordpress/* mappings, and deep package imports need their own mapping.

How?

• Resolve @ariakit/test from the Components workspace and resolve @ariakit/utils from the installed Ariakit test package.
• Put specific module mappings before the generic WordPress package mappings.
• Add a mapping for deep imports from transpiled WordPress packages.
• Reuse the already computed absolute ROOT_DIR as Jest's rootDir.
• Resolve jest-environment-jsdom explicitly.
• Extract the dependencies that Jest must transform into a dependenciesToTransform array.

Testing Instructions

• npm run test:unit should be happy, already checked by CI

Testing Instructions for Keyboard

Not applicable. This PR does not change the user interface.

Screenshots or screencast

Not applicable.

Use of AI Tools

OpenAI Codex, used only to draft this PR description.

[github-actions]

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Co-authored-by: manzoorwanijk <manzoorwanijk@git.wordpress.org>
Co-authored-by: Mamaduka <mamaduka@git.wordpress.org>

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[github-actions]

Size Change: 0 B

Total Size: 7.76 MB

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[Mamaduka]

Nice refactoring 🎉

[github-actions]

Flaky tests detected in cf04a3a.
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/30632253120
📝 Reported issues:

• [Flaky Test] default to my most recently created menu #58976 in /test/e2e/specs/editor/blocks/navigation.spec.js