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Lighthouse CI Accessibility Integration

What Is Lighthouse CI?

Lighthouse CI is a suite of tools for running Google Lighthouse audits in CI pipelines. The most common GitHub Actions integration uses treosh/lighthouse-ci-action.

Lighthouse provides:

• Performance, accessibility, best practices, and SEO scoring (0-100)
• Individual audit results with pass/fail status and detailed findings
• Score budgets and assertions to fail builds on regressions
• HTML and JSON report artifacts
• Score comparison across runs for trend tracking

Accessibility focus: The Lighthouse accessibility category runs a subset of axe-core rules and reports a weighted score from 0-100 along with individual audit violations.

Detecting Lighthouse CI Presence

Workflow File Detection

Search for workflow files referencing Lighthouse CI:

# Search for the treosh Lighthouse CI action
grep -rl "treosh/lighthouse-ci-action" .github/workflows/

# Search for official Lighthouse CI CLI usage
grep -rl "lhci autorun\|lighthouse-ci" .github/workflows/

Patterns to match in YAML:

- uses: treosh/lighthouse-ci-action@v12

Configuration File Detection

Lighthouse CI uses configuration files in the repository root:

# Check for Lighthouse CI config files
ls lighthouserc.js lighthouserc.json .lighthouserc.js .lighthouserc.json .lighthouserc.yml 2>/dev/null

Config File	Format
lighthouserc.js	JavaScript module
lighthouserc.json	JSON
.lighthouserc.js	JavaScript module (dotfile)
.lighthouserc.json	JSON (dotfile)
.lighthouserc.yml	YAML (dotfile)

Configuration Structure

Key fields in Lighthouse CI config:

{
  "ci": {
    "collect": {
      "url": ["https://example.com", "https://example.com/about"],
      "numberOfRuns": 3
    },
    "assert": {
      "assertions": {
        "categories:accessibility": ["error", {"minScore": 0.9}]
      }
    },
    "upload": {
      "target": "temporary-public-storage"
    }
  }
}