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(Compiler) Playground workflow (react/react)

The (Compiler) Playground workflow from react/react, explained and optimized by Latchkey.

C

CI health: C - fair

Point runs-on at Latchkey and get caching, job timeouts, self-healing for flaky steps, and up to 58% lower cost, applied automatically.

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Source: react/react.github/workflows/compiler_playground.ymlLicense MITView source

What it does

This is the (Compiler) Playground workflow from the react/react 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: (Compiler) Playground

on:
  push:
    branches: [main]
  pull_request:
    paths:
      - compiler/**
      - .github/workflows/compiler_playground.yml

permissions: {}

concurrency:
  group: ${{ github.workflow }}-${{ github.ref_name }}-${{ github.event.pull_request.number || github.run_id }}
  cancel-in-progress: true

env:
  TZ: /usr/share/zoneinfo/America/Los_Angeles
  # https://github.com/actions/cache/blob/main/tips-and-workarounds.md#cache-segment-restore-timeout
  SEGMENT_DOWNLOAD_TIMEOUT_MINS: 1

defaults:
  run:
    working-directory: compiler/apps/playground

jobs:
  playground:
    name: Test playground
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version-file: '.nvmrc'
      - name: Cache node_modules
        uses: actions/cache@v4
        id: node_modules
        with:
          path: |
            **/node_modules
          key: compiler-and-playground-node_modules-v6-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('compiler/**/yarn.lock') }}
      - run: yarn install --frozen-lockfile
        if: steps.node_modules.outputs.cache-hit != 'true'
        working-directory: compiler
      - run: yarn install --frozen-lockfile
        if: steps.node_modules.outputs.cache-hit != 'true'
      - name: Check Playwright version
        id: playwright_version
        run: echo "playwright_version=$(npm ls @playwright/test | grep @playwright | sed 's/.*@//' | head -1)" >> "$GITHUB_OUTPUT"
      - name: Cache Playwright Browsers for version ${{ steps.playwright_version.outputs.playwright_version }}
        id: cache_playwright_browsers
        uses: actions/cache@v4
        with:
          path: ~/.cache/ms-playwright
          key: playwright-browsers-v6-${{ runner.arch }}-${{ runner.os }}-${{ steps.playwright_version.outputs.playwright_version }}
      - run: npx playwright install --with-deps chromium
        if: steps.cache_playwright_browsers.outputs.cache-hit != 'true'
      - run: CI=true yarn test
      - run: ls -R test-results
        if: '!cancelled()'
      - name: Archive test results
        if: '!cancelled()'
        uses: actions/upload-artifact@v4
        with:
          name: test-results
          path: compiler/apps/playground/test-results
          if-no-files-found: ignore

The same workflow, on Latchkey

Estimated ~20% faster on cache hits, plus fewer wasted runs and a safer supply chain. Added and changed lines are highlighted.

name: (Compiler) Playground
 
on:
  push:
    branches: [main]
  pull_request:
    paths:
      - compiler/**
      - .github/workflows/compiler_playground.yml
 
permissions: {}
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref_name }}-${{ github.event.pull_request.number || github.run_id }}
  cancel-in-progress: true
 
env:
  TZ: /usr/share/zoneinfo/America/Los_Angeles
  # https://github.com/actions/cache/blob/main/tips-and-workarounds.md#cache-segment-restore-timeout
  SEGMENT_DOWNLOAD_TIMEOUT_MINS: 1
 
defaults:
  run:
    working-directory: compiler/apps/playground
 
jobs:
  playground:
    timeout-minutes: 30
    name: Test playground
    runs-on: latchkey-small
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          cache: 'npm'
          node-version-file: '.nvmrc'
      - name: Cache node_modules
        uses: actions/cache@v4
        id: node_modules
        with:
          path: |
            **/node_modules
          key: compiler-and-playground-node_modules-v6-${{ runner.arch }}-${{ runner.os }}-${{ hashFiles('compiler/**/yarn.lock') }}
      - run: yarn install --frozen-lockfile
        if: steps.node_modules.outputs.cache-hit != 'true'
        working-directory: compiler
      - run: yarn install --frozen-lockfile
        if: steps.node_modules.outputs.cache-hit != 'true'
      - name: Check Playwright version
        id: playwright_version
        run: echo "playwright_version=$(npm ls @playwright/test | grep @playwright | sed 's/.*@//' | head -1)" >> "$GITHUB_OUTPUT"
      - name: Cache Playwright Browsers for version ${{ steps.playwright_version.outputs.playwright_version }}
        id: cache_playwright_browsers
        uses: actions/cache@v4
        with:
          path: ~/.cache/ms-playwright
          key: playwright-browsers-v6-${{ runner.arch }}-${{ runner.os }}-${{ steps.playwright_version.outputs.playwright_version }}
      - run: npx playwright install --with-deps chromium
        if: steps.cache_playwright_browsers.outputs.cache-hit != 'true'
      - run: CI=true yarn test
      - run: ls -R test-results
        if: '!cancelled()'
      - name: Archive test results
        if: '!cancelled()'
        uses: actions/upload-artifact@v4
        with:
          name: test-results
          path: compiler/apps/playground/test-results
          if-no-files-found: ignore

What changed

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 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

actions/checkout actions/setup-node actions/cache actions/upload-artifact