lint workflow (mdn/webextensions-examples)

The lint workflow from mdn/webextensions-examples, explained and optimized by Latchkey.

What it does

This is the lint workflow from the mdn/webextensions-examples repository, a real project running GitHub Actions. It is shown here with attribution under its MPL-2.0 license.

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

The workflow

name: lint
on:
  pull_request:
    paths:
      - "**.js"

jobs:
  eslint:
    name: eslint
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: write

    steps:
      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false

      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
        with:
          node-version: "latest"
          cache: "npm"

      - run: npm ci

      - uses: reviewdog/action-eslint@556a3fdaf8b4201d4d74d406013386aa4f7dab96 # v1
        with:
          reporter: github-pr-review
          eslint_flags: "."
          filter_mode: "file"
          fail_on_error: true

The same workflow, on Latchkey

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

name: lint
on:
  pull_request:
    paths:
      - "**.js"
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  eslint:
    timeout-minutes: 30
    name: eslint
    runs-on: latchkey-small
    permissions:
      contents: read
      pull-requests: write
 
    steps:
      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          persist-credentials: false
 
      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6.4.0
        with:
          node-version: "latest"
          cache: "npm"
 
      - run: npm ci
 
      - uses: reviewdog/action-eslint@556a3fdaf8b4201d4d74d406013386aa4f7dab96 # v1
        with:
          reporter: github-pr-review
          eslint_flags: "."
          filter_mode: "file"
          fail_on_error: 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• Cancel superseded runs when a branch or PR gets a newer push.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 per trigger. On Latchkey the same minutes cost up to 58% less than GitHub-hosted, with zero queue time.

Actions used in this workflow