Check workflow (prettier/eslint-config-prettier)

The Check workflow from prettier/eslint-config-prettier, explained and optimized by Latchkey.

What it does

This is the Check workflow from the prettier/eslint-config-prettier 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: Check

on:
  push:
    branches:
      - main
  pull_request:

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

permissions:
  contents: read

jobs:
  check:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout Repo
        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
        with:
          persist-credentials: false

      - name: Setup Node.js LTS
        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
        with:
          node-version: lts/*
          cache: yarn

      - name: Install Dependencies
        run: yarn --immutable

      - name: ESLint - flat
        run: yarn test:eslint

      - name: ESLint - eslintrc
        run: yarn test:eslint
        env:
          ESLINT_USE_FLAT_CONFIG: "false"

      - name: Prettier
        run: yarn prettier --check .

The same workflow, on Latchkey

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

name: Check
 
on:
  push:
    branches:
      - main
  pull_request:
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
permissions:
  contents: read
 
jobs:
  check:
    timeout-minutes: 30
    runs-on: latchkey-small
 
    steps:
      - name: Checkout Repo
        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
        with:
          persist-credentials: false
 
      - name: Setup Node.js LTS
        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
        with:
          node-version: lts/*
          cache: yarn
 
      - name: Install Dependencies
        run: yarn --immutable
 
      - name: ESLint - flat
        run: yarn test:eslint
 
      - name: ESLint - eslintrc
        run: yarn test:eslint
        env:
          ESLINT_USE_FLAT_CONFIG: "false"
 
      - name: Prettier
        run: yarn prettier --check .
 

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.
• 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