CI workflow (mozilla/pdf.js)

The CI workflow from mozilla/pdf.js, explained and optimized by Latchkey.

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Source: mozilla/pdf.js.github/workflows/ci.ymlLicense Apache-2.0View source

What it does

This is the CI workflow from the mozilla/pdf.js repository, a real project running GitHub Actions. It is shown here with attribution under its Apache-2.0 license.

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

The workflow

workflow (.yml)

name: CI
on: [push, pull_request]
permissions:
  contents: read

jobs:
  test:
    name: Test
    runs-on: ubuntu-latest
    environment: code-coverage

    strategy:
      fail-fast: false
      matrix:
        node-version: [22, 24, 26]

    steps:
      - name: Checkout repository
        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          fetch-depth: 0
          persist-credentials: false

      - name: Use Node.js ${{ matrix.node-version }}
        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
        with:
          node-version: ${{ matrix.node-version }}
          cache: 'npm'

      - name: Install dependencies
        run: npm ci

      - name: Restore cached PDF files
        uses: actions/cache/restore@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
        with:
          path: test/pdfs/*.pdf
          key: cached-pdf-files-${{ hashFiles('test/pdfs/*.pdf') }}
          restore-keys: |
            cached-pdf-files-
          enableCrossOsArchive: true

      - name: Run external tests
        run: npx gulp externaltest

      - name: Run CLI unit tests with code coverage
        run: npx gulp unittestcli --coverage --coverage-output build/coverage/unitcli

      - name: Save cached PDF files
        uses: actions/cache/save@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
        with:
          path: test/pdfs/*.pdf
          key: cached-pdf-files-${{ hashFiles('test/pdfs/*.pdf') }}
          enableCrossOsArchive: true

      - name: Upload results to Codecov
        uses: codecov/codecov-action@fb8b3582c8e4def4969c97caa2f19720cb33a72f # v7.0.0
        with:
          token: ${{ secrets.CODECOV_TOKEN }}
          fail_ci_if_error: true
          files: ./build/coverage/unitcli/lcov.info
          flags: unittestcli
          name: codecov-umbrella
          disable_search: true
          disable_telem: true
          verbose: true

The same workflow, on Latchkey

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

name: CI
on: [push, pull_request]
permissions:
  contents: read
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  test:
    timeout-minutes: 30
    name: Test
    runs-on: latchkey-small
    environment: code-coverage
 
    strategy:
      fail-fast: false
      matrix:
        node-version: [22, 24, 26]
 
    steps:
      - name: Checkout repository
        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          fetch-depth: 0
          persist-credentials: false
 
      - name: Use Node.js ${{ matrix.node-version }}
        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
        with:
          node-version: ${{ matrix.node-version }}
          cache: 'npm'
 
      - name: Install dependencies
        run: npm ci
 
      - name: Restore cached PDF files
        uses: actions/cache/restore@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
        with:
          path: test/pdfs/*.pdf
          key: cached-pdf-files-${{ hashFiles('test/pdfs/*.pdf') }}
          restore-keys: |
            cached-pdf-files-
          enableCrossOsArchive: true
 
      - name: Run external tests
        run: npx gulp externaltest
 
      - name: Run CLI unit tests with code coverage
        run: npx gulp unittestcli --coverage --coverage-output build/coverage/unitcli
 
      - name: Save cached PDF files
        uses: actions/cache/save@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
        with:
          path: test/pdfs/*.pdf
          key: cached-pdf-files-${{ hashFiles('test/pdfs/*.pdf') }}
          enableCrossOsArchive: true
 
      - name: Upload results to Codecov
        uses: codecov/codecov-action@fb8b3582c8e4def4969c97caa2f19720cb33a72f # v7.0.0
        with:
          token: ${{ secrets.CODECOV_TOKEN }}
          fail_ci_if_error: true
          files: ./build/coverage/unitcli/lcov.info
          flags: unittestcli
          name: codecov-umbrella
          disable_search: true
          disable_telem: true
          verbose: true

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.

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 (3 with the matrix expanded) 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 actions/setup-node actions/cache codecov/codecov-action