CI workflow (preactjs/preact)

The CI workflow from preactjs/preact, explained and optimized by Latchkey.

CI health: C - fair

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Source: preactjs/preact.github/workflows/ci.ymlLicense MITView source

What it does

This is the CI workflow from the preactjs/preact 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:
  workflow_dispatch:
  pull_request:
    branches:
      - '**'
  push:
    branches:
      - main
      - restructure
      - v11

jobs:
  filter_jobs:
    name: Filter jobs
    runs-on: ubuntu-latest
    outputs:
      jsChanged: ${{ steps.filter.outputs.jsChanged }}
    steps:
      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
      - uses: dorny/paths-filter@fbd0ab8f3e69293af611ebaee6363fc25e6d187d # v4.0.1
        id: filter
        with:
          # Should be kept in sync with the filter in the PR Reporter workflow
          predicate-quantifier: 'every'
          filters: |
            jsChanged:
              - '**/src/**/*.js'
              - '!devtools/src/devtools.js'

  compressed_size:
    name: Compressed Size
    needs: filter_jobs
    if: ${{ needs.filter_jobs.outputs.jsChanged == 'true' }}
    uses: ./.github/workflows/size.yml

  build_test:
    name: Build & Test
    needs: filter_jobs
    uses: ./.github/workflows/build-test.yml

  benchmarks:
    name: Benchmarks
    needs: build_test
    if: ${{ needs.filter_jobs.outputs.jsChanged == 'true' }}
    uses: ./.github/workflows/benchmarks.yml

The same workflow, on Latchkey

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

name: CI
 
on:
  workflow_dispatch:
  pull_request:
    branches:
      - '**'
  push:
    branches:
      - main
      - restructure
      - v11
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  filter_jobs:
    timeout-minutes: 30
    name: Filter jobs
    runs-on: latchkey-small
    outputs:
      jsChanged: ${{ steps.filter.outputs.jsChanged }}
    steps:
      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
      - uses: dorny/paths-filter@fbd0ab8f3e69293af611ebaee6363fc25e6d187d # v4.0.1
        id: filter
        with:
          # Should be kept in sync with the filter in the PR Reporter workflow
          predicate-quantifier: 'every'
          filters: |
            jsChanged:
              - '**/src/**/*.js'
              - '!devtools/src/devtools.js'
 
  compressed_size:
    timeout-minutes: 30
    name: Compressed Size
    needs: filter_jobs
    if: ${{ needs.filter_jobs.outputs.jsChanged == 'true' }}
    uses: ./.github/workflows/size.yml
 
  build_test:
    timeout-minutes: 30
    name: Build & Test
    needs: filter_jobs
    uses: ./.github/workflows/build-test.yml
 
  benchmarks:
    timeout-minutes: 30
    name: Benchmarks
    needs: build_test
    if: ${{ needs.filter_jobs.outputs.jsChanged == 'true' }}
    uses: ./.github/workflows/benchmarks.yml

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.

This workflow runs 4 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

actions/checkout dorny/paths-filter