CI workflow (tailwindlabs/tailwindcss)

The CI workflow from tailwindlabs/tailwindcss, explained and optimized by Latchkey.

CI health: C - fair

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Source: tailwindlabs/tailwindcss.github/workflows/ci.ymlLicense MITView source

What it does

This is the CI workflow from the tailwindlabs/tailwindcss 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: CI

on:
  push:
    branches: [main]
  pull_request:

permissions:
  contents: read

env:
  NODE_VERSION: 24

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

jobs:
  tests:
    strategy:
      fail-fast: false
      matrix:
        runner:
          - name: Windows
            os: windows-latest

          - name: Linux
            os: namespace-profile-default

          - name: macOS
            os: macos-14

        # Exclude windows and macos from being built on feature branches
        run-all:
          - ${{ github.ref == 'refs/heads/main' || contains(github.event.pull_request.body, '[ci-all]') || github.event.pull_request.user.login == 'depfu[bot]' }}
        exclude:
          - run-all: false
            runner:
              name: Windows
          - run-all: false
            runner:
              name: macOS

    runs-on: ${{ matrix.runner.os }}
    timeout-minutes: 30

    name: ${{ matrix.runner.name }}

    steps:
      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
        with:
          persist-credentials: false
      - uses: pnpm/action-setup@0ebf47130e4866e96fce0953f49152a61190b271 # v6.0.9

      - name: Use Node.js ${{ env.NODE_VERSION }}
        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6
        with:
          node-version: ${{ env.NODE_VERSION }}

      # Cargo already skips downloading dependencies if they already exist
      - name: Cache cargo
        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5
        with:
          path: |
            ~/.cargo/registry/index/
            ~/.cargo/registry/cache/
            ~/.cargo/git/db/
            target/
          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}

      # Cache the `oxide` Rust build
      - name: Cache oxide build
        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5
        with:
          path: |
            ./crates/node/*.node
            ./crates/node/*.wasm
            ./crates/node/index.d.ts
            ./crates/node/index.js
            ./crates/node/browser.js
            ./crates/node/tailwindcss-oxide.wasi-browser.js
            ./crates/node/tailwindcss-oxide.wasi.cjs
            ./crates/node/wasi-worker-browser.mjs
            ./crates/node/wasi-worker.mjs
          key: ${{ runner.os }}-oxide-${{ hashFiles('./crates/**/*') }}

      - name: Setup WASM target
        run: rustup target add wasm32-wasip1-threads

      - name: Install dependencies
        run: pnpm install --frozen-lockfile

      - name: Build
        run: pnpm run build
        env:
          CARGO_PROFILE_RELEASE_LTO: 'off'
          CARGO_TARGET_X86_64_PC_WINDOWS_MSVC_LINKER: 'lld-link'

      - name: Lint
        run: pnpm run lint
        # Only lint on linux to avoid \r\n line ending errors
        if: matrix.runner.os == 'ubuntu-latest'

      - name: Test
        run: pnpm run test

      - name: Install Playwright Browsers
        run: npx playwright install --with-deps

      - name: Run Playwright tests
        run: npm run test:ui

  notify:
    if: ${{ always() && github.ref == 'refs/heads/main' && needs.tests.result == 'failure' }}
    needs: tests
    runs-on: ubuntu-latest
    steps:
      - name: Notify Discord
        uses: discord-actions/message@5c7149c81a83146e5d01f142be1bf87a61831c4d # v2
        with:
          webhookUrl: ${{ secrets.DISCORD_WEBHOOK_URL }}
          message: 'The [most recent ${{ github.workflow }} workflow](<${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}>) on the `main` branch has failed.'

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: CI
 
on:
  push:
    branches: [main]
  pull_request:
 
permissions:
  contents: read
 
env:
  NODE_VERSION: 24
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  tests:
    strategy:
      fail-fast: false
      matrix:
        runner:
          - name: Windows
            os: windows-latest
 
          - name: Linux
            os: namespace-profile-default
 
          - name: macOS
            os: macos-14
 
        # Exclude windows and macos from being built on feature branches
        run-all:
          - ${{ github.ref == 'refs/heads/main' || contains(github.event.pull_request.body, '[ci-all]') || github.event.pull_request.user.login == 'depfu[bot]' }}
        exclude:
          - run-all: false
            runner:
              name: Windows
          - run-all: false
            runner:
              name: macOS
 
    runs-on: ${{ matrix.runner.os }}
    timeout-minutes: 30
 
    name: ${{ matrix.runner.name }}
 
    steps:
      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
        with:
          persist-credentials: false
      - uses: pnpm/action-setup@0ebf47130e4866e96fce0953f49152a61190b271 # v6.0.9
 
      - name: Use Node.js ${{ env.NODE_VERSION }}
        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6
        with:
          cache: 'npm'
          node-version: ${{ env.NODE_VERSION }}
 
      # Cargo already skips downloading dependencies if they already exist
      - name: Cache cargo
        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5
        with:
          path: |
            ~/.cargo/registry/index/
            ~/.cargo/registry/cache/
            ~/.cargo/git/db/
            target/
          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
 
      # Cache the `oxide` Rust build
      - name: Cache oxide build
        uses: actions/cache@27d5ce7f107fe9357f9df03efb73ab90386fccae # v5
        with:
          path: |
            ./crates/node/*.node
            ./crates/node/*.wasm
            ./crates/node/index.d.ts
            ./crates/node/index.js
            ./crates/node/browser.js
            ./crates/node/tailwindcss-oxide.wasi-browser.js
            ./crates/node/tailwindcss-oxide.wasi.cjs
            ./crates/node/wasi-worker-browser.mjs
            ./crates/node/wasi-worker.mjs
          key: ${{ runner.os }}-oxide-${{ hashFiles('./crates/**/*') }}
 
      - name: Setup WASM target
        run: rustup target add wasm32-wasip1-threads
 
      - name: Install dependencies
        run: pnpm install --frozen-lockfile
 
      - name: Build
        run: pnpm run build
        env:
          CARGO_PROFILE_RELEASE_LTO: 'off'
          CARGO_TARGET_X86_64_PC_WINDOWS_MSVC_LINKER: 'lld-link'
 
      - name: Lint
        run: pnpm run lint
        # Only lint on linux to avoid \r\n line ending errors
        if: matrix.runner.os == 'ubuntu-latest'
 
      - name: Test
        run: pnpm run test
 
      - name: Install Playwright Browsers
        run: npx playwright install --with-deps
 
      - name: Run Playwright tests
        run: npm run test:ui
 
  notify:
    timeout-minutes: 30
    if: ${{ always() && github.ref == 'refs/heads/main' && needs.tests.result == 'failure' }}
    needs: tests
    runs-on: latchkey-small
    steps:
      - name: Notify Discord
        uses: discord-actions/message@5c7149c81a83146e5d01f142be1bf87a61831c4d # v2
        with:
          webhookUrl: ${{ secrets.DISCORD_WEBHOOK_URL }}
          message: 'The [most recent ${{ github.workflow }} workflow](<${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}>) on the `main` branch has failed.'

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.
Cache dependency installs on the setup step so they are served from cache.
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
End-to-end and browser tests

This workflow runs 2 jobs (4 with the matrix expanded) 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 pnpm/action-setup actions/setup-node actions/cache