lighthouse-ci
Automate Lighthouse audits in CI with Lighthouse CI. Use when a user asks to track Core Web Vitals, prevent performance regressions, audit accessibility in CI, or set performance budgets for web apps.
What this skill does
# Lighthouse CI
## Overview
Lighthouse CI runs Google Lighthouse audits automatically on every PR. Set performance budgets, track Core Web Vitals over time, and prevent regressions. Catches performance issues before they reach production.
## Instructions
### Step 1: Configuration
```javascript
// lighthouserc.js — Lighthouse CI config
module.exports = {
ci: {
collect: {
url: [
'http://localhost:3000/',
'http://localhost:3000/dashboard',
'http://localhost:3000/pricing',
],
startServerCommand: 'npm run start',
startServerReadyPattern: 'ready on',
numberOfRuns: 3, // average 3 runs for stability
settings: {
preset: 'desktop', // or 'mobile' (default)
},
},
assert: {
assertions: {
'categories:performance': ['error', { minScore: 0.9 }],
'categories:accessibility': ['error', { minScore: 0.95 }],
'categories:best-practices': ['warn', { minScore: 0.9 }],
'categories:seo': ['warn', { minScore: 0.9 }],
// Core Web Vitals
'first-contentful-paint': ['error', { maxNumericValue: 2000 }],
'largest-contentful-paint': ['error', { maxNumericValue: 2500 }],
'cumulative-layout-shift': ['error', { maxNumericValue: 0.1 }],
'total-blocking-time': ['error', { maxNumericValue: 300 }],
},
},
upload: {
target: 'temporary-public-storage', // free, reports available for 7 days
},
},
}
```
### Step 2: GitHub Actions
```yaml
# .github/workflows/lighthouse.yml — Lighthouse CI in GitHub Actions
name: Lighthouse CI
on: [pull_request]
jobs:
lighthouse:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- uses: actions/setup-node@v4
with: { node-version: 20, cache: pnpm }
- run: pnpm install --frozen-lockfile
- run: pnpm build
- name: Run Lighthouse CI
uses: treosh/lighthouse-ci-action@v11
with:
configPath: './lighthouserc.js'
uploadArtifacts: true
temporaryPublicStorage: true
```
### Step 3: Performance Budgets
```json
// budget.json — Resource budgets
[
{
"path": "/*",
"resourceSizes": [
{ "resourceType": "script", "budget": 300 },
{ "resourceType": "total", "budget": 500 },
{ "resourceType": "image", "budget": 200 },
{ "resourceType": "stylesheet", "budget": 50 }
],
"resourceCounts": [
{ "resourceType": "third-party", "budget": 5 }
]
}
]
```
## Guidelines
- Set `numberOfRuns: 3` minimum — single runs have high variance.
- Start with `warn` assertions, switch to `error` once baselines are stable.
- Test critical user paths (landing, dashboard, checkout), not every page.
- Performance budgets prevent "just one more script" — bundle size creep caught early.
- Use `temporary-public-storage` for free report hosting; self-host LHCI Server for history.
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