Coverage workflow (Modernizr/Modernizr)

The Coverage workflow from Modernizr/Modernizr, explained and optimized by Latchkey.

What it does

This is the Coverage workflow from the Modernizr/Modernizr repository, a real project running GitHub Actions. It is shown here with attribution under its MIT license.

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

The workflow

name: Coverage

on: [push, pull_request]

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v6
      - name: Installing Node
        uses: actions/setup-node@v6
        with:
          node-version: 24
          cache: npm
      - name: Installing dependencies
        run: npm ci
        env:
          PUPPETEER_SKIP_DOWNLOAD: true
      - name: Installing gulp command line interface
        run: npm install gulp-cli
      - name: Install Chrome
        id: setup-chrome
        uses: browser-actions/setup-chrome@v1
      - name: Run tests with coverage
        run: npm run coverage:lcov
        env:
          PUPPETEER_EXECUTABLE_PATH: ${{ steps.setup-chrome.outputs.chrome-path }}
      - name: Upload coverage to Codecov
        uses: codecov/codecov-action@v4
        with:
          files: ./coverage/lcov.info
          token: ${{ secrets.CODECOV_TOKEN }} # required

The same workflow, on Latchkey

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

name: Coverage
 
on: [push, pull_request]
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  build:
    timeout-minutes: 30
    runs-on: latchkey-small
    steps:
      - name: Checkout code
        uses: actions/checkout@v6
      - name: Installing Node
        uses: actions/setup-node@v6
        with:
          node-version: 24
          cache: npm
      - name: Installing dependencies
        run: npm ci
        env:
          PUPPETEER_SKIP_DOWNLOAD: true
      - name: Installing gulp command line interface
        run: npm install gulp-cli
      - name: Install Chrome
        id: setup-chrome
        uses: browser-actions/setup-chrome@v1
      - name: Run tests with coverage
        run: npm run coverage:lcov
        env:
          PUPPETEER_EXECUTABLE_PATH: ${{ steps.setup-chrome.outputs.chrome-path }}
      - name: Upload coverage to Codecov
        uses: codecov/codecov-action@v4
        with:
          files: ./coverage/lcov.info
          token: ${{ secrets.CODECOV_TOKEN }} # required
 

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.
• Add a job timeout so a hung step cannot burn hours of runner time.

2 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

This workflow runs 1 job per trigger. On Latchkey the same minutes cost up to 58% less than GitHub-hosted, with zero queue time.

Actions used in this workflow