test(config): migrate normalize tests to vitest

[43081j]

This migrates the normalize tests to vitest.

As part of that, it drops omit.js since it can't load without some funkiness in vitest and is redundant anyway.

The snapshots were diffed locally and appear to be equal (via a script i had claude make).

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

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Run ID: 54180d14-05c7-4dc9-8723-18bb3d12b246

📥 Commits

Reviewing files that changed from the base of the PR and between f34dd81 and 5254143.

⛔ Files ignored due to path filters (3)

• package-lock.json is excluded by !**/package-lock.json
• packages/config/tests/normalize/__snapshots__/normalize.test.js.snap is excluded by !**/*.snap
• packages/config/tests/normalize/snapshots/tests.js.snap is excluded by !**/*.snap

📒 Files selected for processing (8)

• eslint_temporary_suppressions.js
• packages/config/package.json
• packages/config/src/bin/main.js
• packages/config/src/env/main.ts
• packages/config/tests/normalize/normalize.test.js
• packages/config/tests/normalize/snapshots/tests.js.md
• packages/config/tests/normalize/tests.js
• packages/config/vitest.config.ts

🔗 Linked repositories identified

CodeRabbit considers these linked repositories for cross-repo context during reviews:

• netlify/blueprints (manual)

💤 Files with no reviewable changes (1)

• packages/config/tests/normalize/tests.js

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📝 Walkthrough

Summary by CodeRabbit

• Bug Fixes

  • Improved handling of sensitive configuration and environment values when producing CLI output.
  • Increased resilience when processing missing or empty environment configuration.

• Tests

  • Expanded configuration normalization coverage, including commands, defaults, functions, plugins, contexts, and included files.
  • Added Vitest coverage alongside existing test suites for more reliable validation.

Walkthrough

This PR updates packages/config to run Vitest with AVA, adds a Vitest config, and moves normalization snapshot coverage into normalize.test.js. It removes omit.js from the package and replaces its use in CLI output filtering and environment cleanup with Object.entries(...).filter(...) and Object.fromEntries(...). It also expands the temporary ESLint missing-import suppression globs to include .test.js files in packages/build/tests and packages/config/tests.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Possibly related PRs

• netlify/build#7137: Both PRs affect the packages/config test migration path and the Fixture-based tests used without AVA.
• netlify/build#7141: Both PRs connect to test infrastructure updates that require broader .test.js ESLint suppression coverage.
• netlify/build#7095: Both PRs modify eslint_temporary_suppressions.js for n/no-missing-import suppression in test files.

Suggested labels: Adds or modifies js files

Suggested reviewers: serhalp

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the migration of normalize tests to Vitest.
Description check	✅ Passed	The description explains the migration, dependency removal, snapshot validation, and checklist status with sufficient context.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

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[github-actions]

e18e dependency analysis

No dependency warnings found.

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commit: 5254143

[serhalp]

LGTM, thanks! Just one request inline please 🙏🏼

[serhalp]

I fear we'll quietly not run new/ported tests in the future:

Suggested change

	include: ['tests/**/*.test.js'],
	include: ['tests/**/*.test.{js,ts}'],

[serhalp]

🙏🏼 could you split this change out into a separate PR so we can mark it as fix(deps) and keep this one as a pure chore?