babel-loader workflow (babel/babel-loader)
The babel-loader workflow from babel/babel-loader, explained and optimized by Latchkey.
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Grade your own workflow free or run it on Latchkey →What it does
This is the babel-loader workflow from the babel/babel-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: babel-loader
on: [push, pull_request]
permissions:
contents: read # to fetch code (actions/checkout)
jobs:
test:
name: Test - ${{ matrix.os }} - Node ${{ matrix.node-version }}, Babel ${{ matrix.babel-version }}, Webpack ${{ matrix.webpack-version }}
strategy:
matrix:
os: [ubuntu-latest, windows-latest]
node-version: [22, 24]
babel-version: ["7", "8"]
webpack-version: ["5"]
include:
- node-version: "20"
webpack-version: "5"
babel-version: "7"
os: ubuntu-latest
- node-version: "18"
webpack-version: "5"
babel-version: "7"
os: ubuntu-latest
- node-version: "18"
webpack-version: "5"
babel-version: "7"
os: windows-latest
- node-version: "18.20.0" # The minimum supported node version
webpack-version: "5.61.0" # The minimum supported webpack version
babel-version: "7"
os: ubuntu-latest
runs-on: ${{ matrix.os }}
steps:
- uses: actions/checkout@v3
- name: Use Node.js ${{ matrix.node-version }}
uses: actions/setup-node@v3
with:
node-version: ${{ matrix.node-version }}
cache: "yarn"
- name: Install dependencies
run: yarn
- name: Install webpack ${{ matrix.webpack-version }}
run: yarn add -D webpack@${{ matrix.webpack-version }}
- name: Downgrade to Babel 7
if: matrix.babel-version == '7'
run: yarn up @babel/*@^7
- name: Build babel-loader
run: yarn run build
- name: Run tests for webpack version ${{ matrix.webpack-version }}
run: yarn test-only
lint-coverage:
name: Lint and Coverage - ${{ matrix.os }} - Node ${{ matrix.node-version }}, Webpack 5
strategy:
matrix:
os: [ubuntu-latest]
node-version: [latest]
runs-on: ${{ matrix.os }}
steps:
- uses: actions/checkout@v3
- name: Use Node.js ${{ matrix.node-version }}
uses: actions/setup-node@v3
with:
node-version: ${{ matrix.node-version }}
cache: "yarn"
- name: Install dependencies
run: yarn
- name: Run tsc
run: yarn tsc
- name: Run lint and coverage tests
run: yarn test
- name: Submit coverage data to codecov
uses: codecov/codecov-action@v3
with:
token: ${{ secrets.CODECOV_TOKEN }}
The same workflow, on Latchkey
Removes redundant runs and caps runaway jobs. Added and changed lines are highlighted.
name: babel-loader on: [push, pull_request] permissions: contents: read # to fetch code (actions/checkout) concurrency: group: ${{ github.workflow }}-${{ github.ref }} cancel-in-progress: true jobs: test: timeout-minutes: 30 name: Test - ${{ matrix.os }} - Node ${{ matrix.node-version }}, Babel ${{ matrix.babel-version }}, Webpack ${{ matrix.webpack-version }} strategy: matrix: os: [ubuntu-latest, windows-latest] node-version: [22, 24] babel-version: ["7", "8"] webpack-version: ["5"] include: - node-version: "20" webpack-version: "5" babel-version: "7" os: ubuntu-latest - node-version: "18" webpack-version: "5" babel-version: "7" os: ubuntu-latest - node-version: "18" webpack-version: "5" babel-version: "7" os: windows-latest - node-version: "18.20.0" # The minimum supported node version webpack-version: "5.61.0" # The minimum supported webpack version babel-version: "7" os: ubuntu-latest runs-on: ${{ matrix.os }} steps: - uses: actions/checkout@v3 - name: Use Node.js ${{ matrix.node-version }} uses: actions/setup-node@v3 with: node-version: ${{ matrix.node-version }} cache: "yarn" - name: Install dependencies run: yarn - name: Install webpack ${{ matrix.webpack-version }} run: yarn add -D webpack@${{ matrix.webpack-version }} - name: Downgrade to Babel 7 if: matrix.babel-version == '7' run: yarn up @babel/*@^7 - name: Build babel-loader run: yarn run build - name: Run tests for webpack version ${{ matrix.webpack-version }} run: yarn test-only lint-coverage: timeout-minutes: 30 name: Lint and Coverage - ${{ matrix.os }} - Node ${{ matrix.node-version }}, Webpack 5 strategy: matrix: os: [ubuntu-latest] node-version: [latest] runs-on: ${{ matrix.os }} steps: - uses: actions/checkout@v3 - name: Use Node.js ${{ matrix.node-version }} uses: actions/setup-node@v3 with: node-version: ${{ matrix.node-version }} cache: "yarn" - name: Install dependencies run: yarn - name: Run tsc run: yarn tsc - name: Run lint and coverage tests run: yarn test - name: Submit coverage data to codecov uses: codecov/codecov-action@v3 with: token: ${{ secrets.CODECOV_TOKEN }}
What changed
- 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.
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.
This workflow runs 2 jobs (9 with the matrix expanded) per trigger. On Latchkey the same minutes cost up to 58% less than GitHub-hosted, with zero queue time.