Tests: pretest/posttest workflow (import-js/eslint-plugin-import)

The Tests: pretest/posttest workflow from import-js/eslint-plugin-import, explained and optimized by Latchkey.

What it does

This is the Tests: pretest/posttest workflow from the import-js/eslint-plugin-import 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: 'Tests: pretest/posttest'

on: [pull_request, push]

permissions:
  contents: read

jobs:
  # pretest:
  #   runs-on: ubuntu-latest

  #   steps:
  #     - uses: actions/checkout@v4
  #     - uses: ljharb/actions/node/install@main
  #       name: 'nvm install lts/* && npm install'
  #       with:
  #         node-version: 'lts/*'
  #         skip-ls-check: true
  #     - run: npm run pretest

  types:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: ljharb/actions/node/install@main
        name: 'npm install'
        with:
          skip-ls-check: true
      # for some reason we've got to force typescript to install here
      # even though the npm script has `typescript@latest`
      - run: npm i --force typescript@latest
      - run: npm run test-types

  posttest:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4
      - uses: ljharb/actions/node/install@main
        name: 'nvm install lts/* && npm install'
        with:
          node-version: 'lts/*'
          skip-ls-check: true
      - run: npm run posttest

The same workflow, on Latchkey

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

name: 'Tests: pretest/posttest'
 
on: [pull_request, push]
 
permissions:
  contents: read
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  # pretest:
  #   runs-on: latchkey-small
 
  #   steps:
  #     - uses: actions/checkout@v4
  #     - uses: ljharb/actions/node/install@main
  #       name: 'nvm install lts/* && npm install'
  #       with:
  #         node-version: 'lts/*'
  #         skip-ls-check: true
  #     - run: npm run pretest
 
  types:
    timeout-minutes: 30
    runs-on: latchkey-small
    steps:
      - uses: actions/checkout@v4
      - uses: ljharb/actions/node/install@main
        name: 'npm install'
        with:
          skip-ls-check: true
      # for some reason we've got to force typescript to install here
      # even though the npm script has `typescript@latest`
      - run: npm i --force typescript@latest
      - run: npm run test-types
 
  posttest:
    timeout-minutes: 30
    runs-on: latchkey-small
 
    steps:
      - uses: actions/checkout@v4
      - uses: ljharb/actions/node/install@main
        name: 'nvm install lts/* && npm install'
        with:
          node-version: 'lts/*'
          skip-ls-check: true
      - run: npm run posttest
 

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.

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:

• Dependency installs

This workflow runs 2 jobs per trigger. On Latchkey the same minutes cost up to 58% less than GitHub-hosted, with zero queue time.

Actions used in this workflow