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postcss-loader workflow (webpack/postcss-loader)

The postcss-loader workflow from webpack/postcss-loader, explained and optimized by Latchkey.

C

CI health: C - fair

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Source: webpack/postcss-loader.github/workflows/nodejs.ymlLicense MITView source

What it does

This is the postcss-loader workflow from the webpack/postcss-loader 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

workflow (.yml)
name: postcss-loader

on:
  push:
    branches:
      - main
      - next
  pull_request:
    branches:
      - main
      - next

permissions:
  contents: read

jobs:
  lint:
    name: Lint - ${{ matrix.os }} - Node v${{ matrix.node-version }}

    env:
      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

    strategy:
      matrix:
        os: [ubuntu-latest]
        node-version: [lts/*]

    runs-on: ${{ matrix.os }}

    concurrency:
      group: lint-${{ matrix.os }}-v${{ matrix.node-version }}-${{ github.ref }}
      cancel-in-progress: true

    steps:
      - uses: actions/checkout@v5
        with:
          fetch-depth: 0

      - name: Use Node.js ${{ matrix.node-version }}
        uses: actions/setup-node@v4
        with:
          node-version: ${{ matrix.node-version }}
          cache: "npm"

      - name: Install dependencies
        run: npm ci

      - name: Lint
        run: npm run lint

      - name: Security audit
        run: npm run security

      - name: Validate PR commits with commitlint
        if: github.event_name == 'pull_request'
        run: npx commitlint --from ${{ github.event.pull_request.head.sha }}~${{ github.event.pull_request.commits }} --to ${{ github.event.pull_request.head.sha }} --verbose

  test:
    name: Test - ${{ matrix.os }} - Node v${{ matrix.node-version }}, Webpack ${{ matrix.webpack-version }}

    strategy:
      matrix:
        os: [ubuntu-latest, windows-latest, macos-latest]
        node-version: [18.x, 20.x, 22.x, 24.x]
        webpack-version: [latest]

    runs-on: ${{ matrix.os }}

    concurrency:
      group: test-${{ matrix.os }}-v${{ matrix.node-version }}-${{ matrix.webpack-version }}-${{ github.ref }}
      cancel-in-progress: true

    steps:
      - name: Setup Git
        if: matrix.os == 'windows-latest'
        run: git config --global core.autocrlf input

      - uses: actions/checkout@v5

      - name: Use Node.js ${{ matrix.node-version }}
        uses: actions/setup-node@v4
        with:
          node-version: ${{ matrix.node-version }}
          cache: "npm"

      - name: Install dependencies
        run: npm ci

      - name: Install webpack ${{ matrix.webpack-version }}
        if: matrix.webpack-version != 'latest'
        run: npm i webpack@${{ matrix.webpack-version }}

      - name: Run tests for webpack version ${{ matrix.webpack-version }}
        run: npm run test:coverage -- --ci

      - name: Submit coverage data to codecov
        uses: codecov/codecov-action@v5
        with:
          token: ${{ secrets.CODECOV_TOKEN }}

The same workflow, on Latchkey

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

name: postcss-loader
 
on:
  push:
    branches:
      - main
      - next
  pull_request:
    branches:
      - main
      - next
 
permissions:
  contents: read
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  lint:
    timeout-minutes: 30
    name: Lint - ${{ matrix.os }} - Node v${{ matrix.node-version }}
 
    env:
      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
    strategy:
      matrix:
        os: [ubuntu-latest]
        node-version: [lts/*]
 
    runs-on: ${{ matrix.os }}
 
    concurrency:
      group: lint-${{ matrix.os }}-v${{ matrix.node-version }}-${{ github.ref }}
      cancel-in-progress: true
 
    steps:
      - uses: actions/checkout@v5
        with:
          fetch-depth: 0
 
      - name: Use Node.js ${{ matrix.node-version }}
        uses: actions/setup-node@v4
        with:
          node-version: ${{ matrix.node-version }}
          cache: "npm"
 
      - name: Install dependencies
        run: npm ci
 
      - name: Lint
        run: npm run lint
 
      - name: Security audit
        run: npm run security
 
      - name: Validate PR commits with commitlint
        if: github.event_name == 'pull_request'
        run: npx commitlint --from ${{ github.event.pull_request.head.sha }}~${{ github.event.pull_request.commits }} --to ${{ github.event.pull_request.head.sha }} --verbose
 
  test:
    timeout-minutes: 30
    name: Test - ${{ matrix.os }} - Node v${{ matrix.node-version }}, Webpack ${{ matrix.webpack-version }}
 
    strategy:
      matrix:
        os: [ubuntu-latest, windows-latest, macos-latest]
        node-version: [18.x, 20.x, 22.x, 24.x]
        webpack-version: [latest]
 
    runs-on: ${{ matrix.os }}
 
    concurrency:
      group: test-${{ matrix.os }}-v${{ matrix.node-version }}-${{ matrix.webpack-version }}-${{ github.ref }}
      cancel-in-progress: true
 
    steps:
      - name: Setup Git
        if: matrix.os == 'windows-latest'
        run: git config --global core.autocrlf input
 
      - uses: actions/checkout@v5
 
      - name: Use Node.js ${{ matrix.node-version }}
        uses: actions/setup-node@v4
        with:
          node-version: ${{ matrix.node-version }}
          cache: "npm"
 
      - name: Install dependencies
        run: npm ci
 
      - name: Install webpack ${{ matrix.webpack-version }}
        if: matrix.webpack-version != 'latest'
        run: npm i webpack@${{ matrix.webpack-version }}
 
      - name: Run tests for webpack version ${{ matrix.webpack-version }}
        run: npm run test:coverage -- --ci
 
      - name: Submit coverage data to codecov
        uses: codecov/codecov-action@v5
        with:
          token: ${{ secrets.CODECOV_TOKEN }}

What changed

1 third-party action is referenced by a movable tag. Pin it 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:

This workflow runs 2 jobs (13 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 codecov/codecov-action