lighthouse-on-vercel-preview-url.yml

name: Vercel Preview URL Lighthouse Audit

on:
  push:
    branches:
      - main

jobs:
  generate_lighthouse_audit:
    timeout-minutes: 5
    runs-on: ubuntu-latest
    steps:
      # wait arbitrary 120s for the build to finish, changes it if your builds are longer. Potential fix: https://github.com/marketplace/actions/await-for-vercel-deployment
      - run: sleep 120
      - name: Capture Vercel preview URL
        id: vercel_preview_url
        uses: zentered/vercel-preview-url@v1.3.0
        env:
          VERCEL_TOKEN: ${{ secrets.VERCEL_TOKEN }}
        with:
          # find project id here: https://vercel.com/darkroom-engineering/satus/settings
          vercel_team_id: 'darkroom-engineering'
          vercel_project_id: ${{ secrets.VERCEL_PROJECT_ID }}
      - uses: actions/checkout@v4.2.1
      - name: Audit preview URL with Lighthouse
        id: lighthouse_audit
        uses: treosh/lighthouse-ci-action@v12
        with:
          urls: |
            "https://${{ steps.vercel_preview_url.outputs.preview_url }}"
          uploadArtifacts: true
          temporaryPublicStorage: true
      - name: Format lighthouse score
        id: format_lighthouse_score
        uses: actions/github-script@v7
        with:
          github-token: ${{secrets.GITHUB_TOKEN}}
          script: |
            const result = ${{ steps.lighthouse_audit.outputs.manifest }}[0].summary
            const link = ${{ steps.lighthouse_audit.outputs.manifest }}[0].url
            const formatResult = (res) => Math.round((res * 100))
            Object.keys(result).forEach(key => result[key] = formatResult(result[key]))
            const score = res => res >= 90 ? '🟢' : res >= 50 ? '🟠' : '🔴'
            const comment = [
                '',
                `${score(result.performance)} Performance: ${result.performance}`,
                `${score(result.accessibility)} Accessibility: ${result.accessibility}`,
                `${score(result['best-practices'])} Best practices: ${result['best-practices']}`,
                `${score(result.seo)} SEO: ${result.seo}`,
                ' ',
                `*Lighthouse ran on ${link}
             core.setOutput("comment", comment);
      - name: Create commit comment
        uses: peter-evans/commit-comment@v3
        with:
          body: |
            "${{ steps.format_lighthouse_score.outputs.comment }}"