GitHub action to detect which packages have changed

Use this GitHub action to determine which of a projects packages changed.

This allows you to control which jobs are run or skipped based on where the code has changed.

Options

Parameter	Description
from	commit reference to check for changes from. Default: HEAD~1.
to	commit reference to check for changes to. Default: HEAD.
path	starting path to look for changes. Default: the current working directory.

Outputs

Parameter	Type	Description
pkgs	string[]	Array of package names (ex: ["@conneryn/pkg1","@conneryn/pkg2"])
dirs	string[]	Array of root directories for each package that has changed (ex: `["packages/pk1/","packages/pkg2"])

Usage Examples

Scope lerna tests

jobs:
  tests:
    name: Run tests for projects with changes
    runs-on: ubuntu-latest
    steps:
    - name: Checkout
      uses: actions/checkout@v2
      with:
        fetch-depth: 0
    - name: Check packages
      id: changes
      uses: conneryn/packages-changed@v1
    - name: Run tests
      run: |
        lerna test --scope '${{ join(steps.changes.outputs.pkgs, ',') }}'

Control Jobs by package

jobs:
  check:
    name: Checking changes
    outputs:
      pkgs: ${{ steps.changes.outputs.pkgs }}
    runs-on: ubuntu-latest
    steps:
    - name: Checkout
      uses: actions/checkout@v2
      with:
        fetch-depth: 2
    - name: Check packages
      id: changes
      uses: conneryn/packages-changed@v1

  pkgAjob:
    name: Run test/deployments for @myorg/pkg-a
    needs: check
    if: ${{ contains(needs.check.output.pkgs, '@myorg/pkg-a') }}
    steps:
      # ...

  pkgBjob:
    name: Run test/deployments for @myorg/pkg-b
    needs: check
    if: ${{ contains(needs.check.output.pkgs, '@myorg/pkg-b') }}
    steps:
      # ...