node-pr.yml

# This workflow will do a clean installation of node dependencies, cache/restore them, build the source code and run tests across different versions of node
# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-nodejs

name: node-pr

on:
  workflow_dispatch:
  pull_request:
    branches: ["main"]

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

jobs:
  find-yarn-projects:
    runs-on: ubuntu-latest
    outputs:
      matrix: ${{ steps.set-yarn-folders.outputs.matrix }}

    steps:
      - uses: actions/checkout@v3

      - name: Find yarn projects
        id: set-yarn-folders
        # This step uses a bash script to find all subfolders that contain a yarn.lock file
        run: |
          #!/bin/bash
          set -e # exit with nonzero exit code if anything fails
          shopt -s globstar # enable globstar option to use ** for recursive matching
          yarndirs=()
          for lockfile in **/yarn.lock; do # loop over all yarn.lock files
            dir=$(dirname "$lockfile") # get the directory of the lock file
            echo "Found yarn project in $dir"
            yarndirs+=("$dir") # add the directory to the yarndirs array
          done

          echo "All yarn projects found: '${yarndirs[*]}'"
          yarndirs_json=$(echo -n "${yarndirs[*]%\n}" | jq -R -s -j --compact-output 'split(" ")')
          matrix_json="{\"node_version\":[18], \"yarn_folder\":$yarndirs_json}"
          echo "Setting output matrix to $matrix_json"
          echo "matrix=$matrix_json" >> $GITHUB_OUTPUT

  build:
    runs-on: ubuntu-latest
    needs: find-yarn-projects

    strategy:
      matrix: ${{ fromJson(needs.find-yarn-projects.outputs.matrix) }}

    steps:
      - uses: actions/checkout@v3
      - name: Use Node.js ${{ matrix.node_version }}
        uses: actions/setup-node@v3
        with:
          node-version: ${{ matrix.node_version }}
          cache: "yarn"
          cache-dependency-path: "**/yarn.lock"

      - name: Run yarn install & yarn build
        # This step runs yarn install and yarn build for each project.
        # The --frozen-lockfile option ensures that the dependencies are installed exactly as specified in the lock file.
        # The -cwd option sets the current working directory to the folder where the yarn.lock file is located.
        run: |
          #!/bin/bash
          set -e # exit with nonzero exit code if anything fails
          dir=${{ matrix.yarn_folder }} # get the directory of the lock file
          echo "Running yarn install and yarn build for $dir"
          yarn --cwd "$dir" install --frozen-lockfile # install dependencies
          yarn --cwd "$dir" build # run build script