test: allow custom fixture dep overrides

[serhalp]

This is needed to be able to add @netlify/vite-plugin to vite-ecosystem-ci: vitejs/vite-ecosystem-ci#444.

• Allow replacing the Vite version table test array with a single set of custom overrides
• Copy the overrides that vite-ecosystem-ci injects into our package.json into the site fixtures where vite/rolldown/etc. are actually used in our plugin's tests.

[netlify]

✅ Deploy Preview for angular-runtime-demo ready!

Name	Link
🔨 Latest commit	6659056
🔍 Latest deploy log	https://app.netlify.com/projects/angular-runtime-demo/deploys/6a74e8bf647a480008a38f7b
😎 Deploy Preview	https://deploy-preview-34--angular-runtime-demo.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
🤖 Make changes	Run an agent on this branch

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 47fb1e9a-5b4a-4b00-a444-c0b88d83b373

📥 Commits

Reviewing files that changed from the base of the PR and between 566da57 and 6659056.

⛔ Files ignored due to path filters (1)

• package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (4)

• packages/vite-plugin/package.json
• packages/vite-plugin/src/main.test.ts
• packages/vite-plugin/test/support/getPackageOverrides.ts
• packages/vite-plugin/tsconfig.json

🔗 Linked repositories identified

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

• netlify/blueprints (manual)

---

📝 Walkthrough

Summary by CodeRabbit

• Tests
  • Expanded Vite plugin coverage across supported Vite versions and package override scenarios.
  • Added validation for copying package overrides into test fixtures.
• Chores
  • Added development tooling for package metadata normalization.
  • Updated TypeScript configuration to include test files.

Walkthrough

The Vite plugin adds package override loading through getPackageOverrides(). The test suite replaces its Vite-version matrix with copied fixture overrides and supported Vite 5–8 configurations. Fixture setup across middleware, static files, redirects, Image CDN, functions, edge functions, SPA, Blobs, and React tests now applies the selected overrides. TypeScript compilation now includes test files.

Estimated code review effort: 4 (Complex) | ~45 minutes

Suggested reviewers: pieh, eduardoboucas

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description directly explains custom fixture dependency overrides and their use with vite-ecosystem-ci.
Title check	✅ Passed	The title clearly summarizes the main change: support for custom dependency overrides in test fixtures.
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.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch serhalp/test/allow-injecting-fixture-pkg-overrides

---

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

[serhalp]

Highly recommend "Hide whitespace" here!