CI workflow (Leaflet/Leaflet)

The CI workflow from Leaflet/Leaflet, explained and optimized by Latchkey.

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Source: Leaflet/Leaflet.github/workflows/main.ymlLicense BSD-2-ClauseView source

What it does

This is the CI workflow from the Leaflet/Leaflet repository, a real project running GitHub Actions. It is shown here with attribution under its BSD-2-Clause license.

Below, Latchkey shows a faster, safer version produced by its optimization engine.

The workflow

workflow (.yml)

name: CI
on:
  push:
    branches: [main]
    tags: ['v*']
  pull_request:
permissions:
  contents: read
env:
  NODE_VERSION: 24
jobs:
  build-docs:
    runs-on: ubuntu-latest
    timeout-minutes: 5
    steps:
      - uses: actions/checkout@v7

      - uses: ruby/setup-ruby@v1
        with:
          bundler-cache: true
          working-directory: ./docs

      - working-directory: ./docs
        run: bundle exec jekyll build --strict_front_matter

  lint:
    runs-on: ubuntu-latest
    timeout-minutes: 5
    steps:
      - uses: actions/checkout@v7

      - uses: actions/setup-node@v6
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: npm

      - run: npm ci
      - run: npm run lint

  bundlemon:
    if: github.repository_owner == 'Leaflet'
    runs-on: ubuntu-latest
    timeout-minutes: 5
    steps:
      - uses: actions/checkout@v7

      - uses: actions/setup-node@v6
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: npm

      - run: npm ci
      - run: npm run build
      - run: npm run bundlemon
        env:
          CI_COMMIT_SHA: ${{ github.event.pull_request.head.sha || github.sha }}

  test-ssr:
    runs-on: ubuntu-latest
    timeout-minutes: 5
    steps:
      - uses: actions/checkout@v7

      - uses: actions/setup-node@v6
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: npm

      - run: npm ci
      - run: npm run build
      - run: node ./spec/ssr/ssr_node.js

      - uses: denoland/setup-deno@v2
        with:
          deno-version: v2.x

      - run: deno run ./spec/ssr/ssr_deno.js

  test:
    runs-on: ${{ matrix.os || 'ubuntu-latest' }}
    timeout-minutes: 8
    env:
      PLAYWRIGHT_BROWSERS_PATH: ${{ github.workspace }}/.playwright-browsers
    strategy:
      fail-fast: false
      matrix:
        include:
          - project: chromium
          - project: firefox
          - project: chromium-retina
          - project: chromium
            os: windows-latest
          - project: webkit
            os: macos-latest
    steps:
      - uses: actions/checkout@v7

      - uses: actions/setup-node@v6
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: npm

      - run: npm ci

      - name: Cache Playwright browsers
        uses: actions/cache@v6
        with:
          path: ${{ env.PLAYWRIGHT_BROWSERS_PATH }}
          key: pw-${{ runner.os }}-${{ hashFiles('package-lock.json') }}

      - name: Install Playwright browser
        run: npx playwright install ${{ matrix.project == 'chromium-retina' && 'chromium' || matrix.project }}

      - name: Run tests on ${{ matrix.project }}
        run: npx vitest --run --project=${{ matrix.project }}

      - name: Run tests on ${{ matrix.project }} with touch
        run: npx vitest --run --project=${{ matrix.project }}
        env:
          VITE_TOUCH: '1'

  publish-artifacts:
    permissions:
      contents: write
    if: github.repository_owner == 'Leaflet' && github.ref == 'refs/heads/main'
    runs-on: ubuntu-latest
    timeout-minutes: 5
    steps:
      - uses: actions/checkout@v7

      - uses: actions/setup-node@v6
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: npm

      - run: npm ci
      - run: npm run build

      - name: Compress artifacts
        working-directory: dist
        run: zip -r leaflet.zip . ../CHANGELOG.md ../LICENSE ../README.md

      - name: Publish development snapshot
        uses: softprops/action-gh-release@v3
        with:
          tag_name: dev
          name: Development snapshot
          prerelease: true
          files: dist/*
          generate_release_notes: false
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

  publish-npm:
    if: github.repository_owner == 'Leaflet' && startsWith(github.ref, 'refs/tags/v')
    runs-on: ubuntu-latest
    timeout-minutes: 5
    steps:
      - uses: actions/checkout@v7

      - uses: actions/setup-node@v6
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: npm
          registry-url: https://registry.npmjs.org

      - run: npm ci
      - run: npm run build

      - name: Publish to NPM
        run: |
          TAG=$(echo $GITHUB_REF_NAME | grep -oP '^v\d+\.\d+\.\d+-?\K(\w+)?')
          npm publish --tag ${TAG:-latest}
        env:
          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}

The same workflow, on Latchkey

Removes redundant runs and caps runaway jobs. Added and changed lines are highlighted.

name: CI
on:
  push:
    branches: [main]
    tags: ['v*']
  pull_request:
permissions:
  contents: read
env:
  NODE_VERSION: 24
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  build-docs:
    runs-on: latchkey-small
    timeout-minutes: 5
    steps:
      - uses: actions/checkout@v7
 
      - uses: ruby/setup-ruby@v1
        with:
          bundler-cache: true
          working-directory: ./docs
 
      - working-directory: ./docs
        run: bundle exec jekyll build --strict_front_matter
 
  lint:
    runs-on: latchkey-small
    timeout-minutes: 5
    steps:
      - uses: actions/checkout@v7
 
      - uses: actions/setup-node@v6
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: npm
 
      - run: npm ci
      - run: npm run lint
 
  bundlemon:
    if: github.repository_owner == 'Leaflet'
    runs-on: latchkey-small
    timeout-minutes: 5
    steps:
      - uses: actions/checkout@v7
 
      - uses: actions/setup-node@v6
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: npm
 
      - run: npm ci
      - run: npm run build
      - run: npm run bundlemon
        env:
          CI_COMMIT_SHA: ${{ github.event.pull_request.head.sha || github.sha }}
 
  test-ssr:
    runs-on: latchkey-small
    timeout-minutes: 5
    steps:
      - uses: actions/checkout@v7
 
      - uses: actions/setup-node@v6
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: npm
 
      - run: npm ci
      - run: npm run build
      - run: node ./spec/ssr/ssr_node.js
 
      - uses: denoland/setup-deno@v2
        with:
          deno-version: v2.x
 
      - run: deno run ./spec/ssr/ssr_deno.js
 
  test:
    runs-on: ${{ matrix.os || 'ubuntu-latest' }}
    timeout-minutes: 8
    env:
      PLAYWRIGHT_BROWSERS_PATH: ${{ github.workspace }}/.playwright-browsers
    strategy:
      fail-fast: false
      matrix:
        include:
          - project: chromium
          - project: firefox
          - project: chromium-retina
          - project: chromium
            os: windows-latest
          - project: webkit
            os: macos-latest
    steps:
      - uses: actions/checkout@v7
 
      - uses: actions/setup-node@v6
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: npm
 
      - run: npm ci
 
      - name: Cache Playwright browsers
        uses: actions/cache@v6
        with:
          path: ${{ env.PLAYWRIGHT_BROWSERS_PATH }}
          key: pw-${{ runner.os }}-${{ hashFiles('package-lock.json') }}
 
      - name: Install Playwright browser
        run: npx playwright install ${{ matrix.project == 'chromium-retina' && 'chromium' || matrix.project }}
 
      - name: Run tests on ${{ matrix.project }}
        run: npx vitest --run --project=${{ matrix.project }}
 
      - name: Run tests on ${{ matrix.project }} with touch
        run: npx vitest --run --project=${{ matrix.project }}
        env:
          VITE_TOUCH: '1'
 
  publish-artifacts:
    permissions:
      contents: write
    if: github.repository_owner == 'Leaflet' && github.ref == 'refs/heads/main'
    runs-on: latchkey-small
    timeout-minutes: 5
    steps:
      - uses: actions/checkout@v7
 
      - uses: actions/setup-node@v6
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: npm
 
      - run: npm ci
      - run: npm run build
 
      - name: Compress artifacts
        working-directory: dist
        run: zip -r leaflet.zip . ../CHANGELOG.md ../LICENSE ../README.md
 
      - name: Publish development snapshot
        uses: softprops/action-gh-release@v3
        with:
          tag_name: dev
          name: Development snapshot
          prerelease: true
          files: dist/*
          generate_release_notes: false
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
  publish-npm:
    if: github.repository_owner == 'Leaflet' && startsWith(github.ref, 'refs/tags/v')
    runs-on: latchkey-small
    timeout-minutes: 5
    steps:
      - uses: actions/checkout@v7
 
      - uses: actions/setup-node@v6
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: npm
          registry-url: https://registry.npmjs.org
 
      - run: npm ci
      - run: npm run build
 
      - name: Publish to NPM
        run: |
          TAG=$(echo $GITHUB_REF_NAME | grep -oP '^v\d+\.\d+\.\d+-?\K(\w+)?')
          npm publish --tag ${TAG:-latest}
        env:
          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}

What changed

Run on Latchkey managed runners with one line (runs-on), which apply the fixes below automatically and self-heal transient failures. This example uses latchkey-small; pick the runner size that fits the job.
Cancel superseded runs when a branch or PR gets a newer push.

3 third-party actions are referenced by a movable tag. Pin them to the commit SHA (Latchkey resolves and applies this automatically) so a repointed tag cannot change what runs.

What Latchkey heals here

This workflow has steps that commonly fail on transient issues (network, registries, flaky browsers). On Latchkey managed runners they are detected, retried, and self-healed instead of failing your build:

Dependency installs
End-to-end and browser tests

This workflow runs 7 jobs per trigger. On Latchkey the same minutes cost up to 58% less than GitHub-hosted, with zero queue time.

Actions used in this workflow

actions/checkout ruby/setup-ruby actions/setup-node actions/cache softprops/action-gh-release