ci: add CodSpeed performance benchmarks

[codspeed-hq]

Summary

This PR sets up CodSpeed continuous performance measurement for Nuxt UI. It adds benchmarks for the framework-agnostic utility functions that power components (data access, comparison, search highlighting, and content navigation mapping) and wires them into CI so regressions are caught automatically on every pull request.

Changes

• @codspeed/vitest-plugin added as a dev dependency (lockfile updated with pnpm).
• vitest.bench.config.ts: a dedicated Vitest config for benchmarks that registers the CodSpeed plugin and picks up bench/**/*.bench.ts. It is kept separate from the main vitest.config.ts so the Nuxt/happy-dom test projects are untouched.
• bench/ benchmarks covering pure, hot-path utilities:
  • bench/utils.bench.ts — get, set, pick, omit, compare, isEmpty, getDisplayValue, mergeClasses, transformUI, resolveBaseURL
  • bench/search.bench.ts — sanitizeSnippet and highlight
  • bench/content.bench.ts — mapContentNavigation (flat, deeply nested, depth-limited)
• bench script in package.json: vitest bench --run --config vitest.bench.config.ts.
• GitHub Actions workflow (.github/workflows/codspeed.yml): runs on push/pull_request targeting v4 and on workflow_dispatch. It mirrors the existing module.yml setup (pnpm, Node 22, pnpm run dev:prepare) and runs benchmarks through CodSpeedHQ/action@v4 in simulation mode using OIDC authentication.
• README badge added for CodSpeed.

Notes

• Simulation mode is used (the default for Node.js): deterministic, hardware-agnostic CPU measurement with low variance, suitable for these CPU-bound utility functions. It runs on ubuntu-latest.
• pnpm run dev:prepare is required before benchmarking because the root tsconfig.json extends the generated .nuxt/tsconfig.json; the workflow runs it as an explicit step, matching the existing test workflow.
• Benchmarks were verified locally with codspeed run --mode simulation -- pnpm bench — all 24 benchmarks execute and report successfully.

Next steps

• Once merged, CodSpeed will start tracking these benchmarks and comment performance diffs on future PRs.
• Additional benchmarks can be added by dropping new *.bench.ts files into bench/.

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​codspeed/​vitest-plugin@​5.7.1

View full report

[codspeed-hq]

Congrats! CodSpeed is installed 🎉

🆕 24 new benchmarks were detected.

You will start to see performance impacts in the reports once the benchmarks are run from your default branch.

Detected benchmarks

• deeply nested navigation: 4.2 ms
• deeply nested navigation with depth limit: 353.8 µs
• flat navigation: 212.5 µs
• highlight matches: 82.6 µs
• highlight with token search: 78.1 µs
• plain text: 41.8 µs
• with mark highlights: 58.9 µs
• with unsafe html: 73 µs
• deep equality: 14.4 µs
• objects with comparator key: 308.3 µs
• primitive strings: 13.6 µs
• array path: 19.4 µs
• missing path with default: 46.5 µs
• nested string path: 50.4 µs
• find by value key in large list: 451.7 µs
• array: 13.2 µs
• empty string: 19.5 µs
• populated object: 42.9 µs
• array + prop class: 27.6 µs
• omit keys: 38.4 µs
• ...

ℹ️ Only the first 20 benchmarks are displayed. Go to the app to view all benchmarks.

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[pkg-pr-new]

npm i https://pkg.pr.new/@nuxt/ui@6732

commit: 5de2431