ci: run Lighthouse during pull requests

[chrstph-dvx]

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Project	Deployment	Actions	Updated (UTC)
arbitrum-portal	Ready	Preview	Jul 31, 2026 4:06pm

[Copilot]

Pull request overview

This PR adds an automated Lighthouse “user-flow” run to pull requests, producing a summarized report (JSON + Markdown) and posting/updating a PR comment with the results. It integrates the new reporting script into the existing monorepo tooling and CI workflow.

Changes:

• Added a generateLighthouseReport script (Puppeteer + Lighthouse) that runs multiple flows, parses/averages results, diffs against a committed baseline, and formats a PR-ready Markdown report.
• Introduced a new GitHub Actions workflow to run Lighthouse on PRs, publish results to the job summary, and upsert a PR comment.
• Improved bridge token selection automation by adding an aria-label to token rows; updated repo scripts and ignore rules for generated Lighthouse artifacts.

Reviewed changes

Copilot reviewed 13 out of 15 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pnpm-lock.yaml	Adds Lighthouse/Puppeteer/tsx dependency resolution updates.
packages/scripts/src/generateLighthouseReport/types.ts	Defines lightweight Lighthouse flow/result types used by parsing/reporting code.
packages/scripts/src/generateLighthouseReport/parseLighthouseReports.ts	Parses flow JSON, averages scores/metrics across runs, and produces a summary.
packages/scripts/src/generateLighthouseReport/parseLighthouseReports.test.ts	Adds unit tests for parsing/compare/format behavior.
packages/scripts/src/generateLighthouseReport/lighthouseBaseline.json	Adds a baseline summary used for result diffs.
packages/scripts/src/generateLighthouseReport/index.ts	Implements report generation orchestration, file outputs, and optional baseline updates.
packages/scripts/src/generateLighthouseReport/formatLighthouseReport.ts	Formats summary + baseline + diff into a Markdown report for CI/PR comments.
packages/scripts/src/generateLighthouseReport/executeLighthouse.ts	Runs a Lighthouse user flow via Puppeteer and writes per-run reports.
packages/scripts/src/generateLighthouseReport/compareLighthouseReports.ts	Computes numeric deltas between current summary and baseline.
packages/scripts/src/generateLighthouseReport/cli.ts	Adds a CLI entrypoint for running the report generator (and updating baseline).
packages/scripts/package.json	Adds generate-lighthouse-report script and Lighthouse/Puppeteer/tsx dependencies.
packages/arb-token-bridge-ui/src/components/TransferPanel/TokenRow.tsx	Adds an aria-label to token selection buttons to support automation/accessibility.
package.json	Adds a root lighthouse:ci script to invoke the scripts package generator.
.gitignore	Ignores generated lighthouse-reports/ output directory.
.github/workflows/lighthouse.yml	Adds a PR workflow that runs Lighthouse, publishes a summary, and updates a PR comment.

Files not reviewed (1)

• pnpm-lock.yaml: Generated file

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[github-actions]

🗼 Lighthouse user-flow results

Results are the mean of three sequential desktop runs. Δ is result minus baseline.

Navigation	Result	Baseline	Δ
Performance	49.67	59.33	-9.66 ⚠️
Accessibility	99	99	0
Best Practices	74	74	0
SEO	100	100	0
First Contentful Paint	100 (305.835 ms)	100 (290.153 ms)	0 (+15.682 ⚠️ ms)
Largest Contentful Paint	11.33 (4537.861 ms)	14.33 (4216.369 ms)	-3 ⚠️ (+321.492 ⚠️ ms)
Total Blocking Time	6.67 (934.629 ms)	36.67 (443.29 ms)	-30 ⚠️ (+491.339 ⚠️ ms)
Cumulative Layout Shift	100 (0)	100 (0)	0 (0)
Speed Index	98 (918.875 ms)	100 (375.308 ms)	-2 ⚠️ (+543.567 ⚠️ ms)
Total Byte Weight	50 (3543326 bytes)	50 (3619288.667 bytes)	0 (-75962.667 ✅ bytes)

Interaction timespan	Result	Baseline	Δ
Performance	45	45	0
Best Practices	63	63	0
Total Blocking Time	0 (5791.331 ms)	0 (3183.219 ms)	0 (+2608.112 ⚠️ ms)
Cumulative Layout Shift	100 (0.009)	100 (0.003)	0 (+0.006 ⚠️)
Interaction to Next Paint	56 (448 ms)	79 (274.667 ms)	-23 ⚠️ (+173.333 ⚠️ ms)
Long tasks	20 (6594.654 ms)	20 (4181.92 ms)	0 (+2412.734 ⚠️ ms)

Final snapshot	Result	Baseline	Δ
Accessibility	95	95	0
Best Practices	100	100	0
SEO	100	100	0