publish.yml

name: Publish to npm on Version Bump

# Trigger the workflow on push events to the main branch
on:
  push:
    branches:
      - master
    # Optional: Run only when package.json is modified
    # paths:
    #   - 'package.json'

jobs:
  publish:
    runs-on: ubuntu-latest

    steps:
      # 1. Checkout the repository code
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0  # Fetch all history for version comparison

      # 2. Setup Node.js environment
      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '20'  # Specify your Node.js version
          registry-url: 'https://registry.npmjs.org/'

      # 3. Install dependencies
      - name: Install dependencies
        run: npm install

      # 4. Get the current version from package.json
      - name: Get current version
        id: current_version
        run: |
          CURRENT_VERSION=$(node -p "require('./package.json').version")
          echo "current_version=$CURRENT_VERSION" >> $GITHUB_ENV

      # 5. Get the previous version from the last commit's package.json
      - name: Get previous version
        id: previous_version
        run: |
          # Check if there is a previous commit
          if git rev-parse HEAD~1 >/dev/null 2>&1; then
            PREVIOUS_VERSION=$(git show HEAD~1:package.json | node -p "require('./package.json').version")
          else
            PREVIOUS_VERSION=$CURRENT_VERSION
          fi
          echo "previous_version=$PREVIOUS_VERSION" >> $GITHUB_ENV

      # 6. Compare versions to detect a bump
      - name: Check for version bump
        id: version_check
        run: |
          if [ "$current_version" != "$previous_version" ]; then
            echo "version_bumped=true" >> $GITHUB_ENV
          else
            echo "version_bumped=false" >> $GITHUB_ENV
          fi

      # 7. Publish to npm if version is bumped
      - name: Publish to npm
        if: env.version_bumped == 'true'
        run: npm publish --access public
        env:
          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}

      # 8. Notify if no version bump detected (optional)
      - name: Notify no version bump
        if: env.version_bumped != 'true'
        run: echo "No version bump detected. Skipping npm publish."