npm_publish.yml

---
on: push

jobs:
  publish:
    env:
      # default dryrun publish to NPM
      ENABLE_DRYRUN: true
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v1
      - uses: actions/setup-node@v1
        with:
          node-version: 12
      - run: npm install
      - run: npm test

      # real publish after a PR to main branch
      - if: ${{ startsWith(github.ref, 'refs/heads/main') }}
        # see https://github.blog/changelog/2020-10-01-github-actions-deprecating-set-env-and-add-path-commands/
        run: |
          # disable command workflow processing
          echo "::stop-commands::`echo -n ${{ github.token }} | sha256sum | head -c 64`"

          echo "::set-env name=ENABLE_DRYRUN::false"

          # enable workflow command processing
          echo "::`echo -n ${{ github.token }} | sha256sum | head -c 64`::"

      - id: publish
        uses: JS-DevTools/npm-publish@v1
        with:
          dry-run: ${{ env.ENABLE_DRYRUN }}
          token: ${{ secrets.NPM_TOKEN }}

      - if: steps.publish.outputs.type != 'none'
        run: |
          echo "Version changed: ${{ steps.publish.outputs.old-version }} => ${{ steps.publish.outputs.version }}"