This setup installs HHVM and enables execution of Hack language code in a controlled environment.

Compatibility Notice
HHVM currently supports only specific Ubuntu LTS versions. Ensure your environment uses one of the following:

• Ubuntu 22.04 (Jammy)
• Ubuntu 20.04 (Focal)

The ubuntu-latest runner (currently 24.04) is not supported and will lead to installation or runtime issues.

For consistency and reliability—especially in CI/CD pipelines—use a Docker container based on Ubuntu 20.04. This guarantees compatibility with HHVM and avoids dependency conflicts introduced in newer distributions.
It is recommended to create a Docker image using Ubuntu 20.04 as the base for running HHVM/Hack.

• Avoid using ubuntu-latest in GitHub Actions for HHVM workflows.
• Prefer explicit OS versioning (ubuntu-22.04 or ubuntu-20.04).
• Use Docker when portability and reproducibility are required.

runs-on: ubuntu-latest
container:
  image: ubuntu:20.04

steps:
  - name: Checkout code
    uses: actions/checkout@v5

  - name: Setup HHVM/Hacklang
    uses: CodeWithSushil/setup-hhvm@v2.2
    with:
      hack-version: latest

  - name: Run Hack code
    run: hhvm index.php