on_release_pull_merged.yml

# This workflow provided by GitHub Actions Manager
# Documentation: https://github.com/vemel/github_actions_js/blob/main/nodejs_workflows/README.md
#
# - Runs only if `NPM_TOKEN` secret is set
# - Starts on Pull Request merge for `release/*` branch
# - Uses Pull Request branch for deployment, so released version contains only changes
#   from base branch when Release had been published
# - Builds package if `build` script is available in `package.json`
# - Publishes new version to [npm](https://www.npmjs.com/)
#
# Secrets:
#   NPM_TOKEN - Token for npm publishing https://docs.npmjs.com/creating-and-viewing-access-tokens

name: Publish to NPM
"on":
  pull_request:
    types:
      - closed
  workflow_dispatch:
    inputs:
      number:
        description: Pull Request number
        required: true
jobs:
  publish-to-npm:
    runs-on: ubuntu-latest
    env:
      BUILD_SCRIPT: build
      NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
    steps:
      - name: Get Pull Request
        id: pull-request
        if: env.NPM_TOKEN
        uses: actions/github-script@v6
        with:
          script: |
            // github-actions-managed: true
            let pullRequest = null;
            if (context.payload.inputs && context.payload.inputs.number) {
              // find Pull Request by number fom input
              const number = context.payload.inputs.number;
              try {
                pullRequest = (await github.pulls.get({
                  owner: context.repo.owner,
                  repo: context.repo.repo,
                  pull_number: number,
                })).data;
              } catch(e) {
                core.error(`Cannot get Pull Request #${number}: ${e}`);
                return;
              }
            } else {
              // get Pull Request from event payload
              pullRequest = context.payload.pull_request;
            }

            if (!pullRequest) {
              core.error(`Cannot find Pull Request`);
              return;
            }

            // Stop if Pull request is not merged
            if (!pullRequest.merged) {
              core.info(`Pull Request ${pullRequest.number} is not merged, skipping`);
              return;
            }

            // Stop if Pull Request branch name starts with `release`
            const branch = pullRequest.head.ref;
            if (!branch.startsWith('release')) {
              core.info(`This is not a release branch ${branch}, skipping`);
              return;
            }

            core.setOutput('branch', branch);
            core.setOutput('base', pullRequest.base.ref);
            core.setOutput('number', pullRequest.number);
            core.setOutput('url', pullRequest.html_url);
            core.setOutput('body', pullRequest.body);
            core.setOutput('suffix', `[#${pullRequest.number}](${pullRequest.html_url})`);
            return true;
      - name: Checkout Pull Request base branch
        id: checkout
        if: steps.pull-request.outputs.result
        uses: actions/checkout@v3
        with:
          github-actions-managed: true
          ref: ${{ steps.pull-request.outputs.base }}
      - name: Get available scripts
        id: scripts
        if: steps.pull-request.outputs.result
        uses: actions/github-script@v6
        with:
          script: |
            // github-actions-managed: true
            const output = (await exec.getExecOutput('npm run')).stdout;
            const scripts = output.split(/\r?\n/)
              .filter(line => line.startsWith('  ') && !line.startsWith('   '))
              .map(line => line.trim());

            if (scripts.includes(process.env.BUILD_SCRIPT)) {
              core.setOutput('build', process.env.BUILD_SCRIPT);
            }
            return true;
      - name: Set up Node.js
        uses: actions/setup-node@v3
        id: setup-node
        if: steps.pull-request.outputs.result
        with:
          github-actions-managed: true
          registry-url: https://registry.npmjs.org/
          node-version: 18
      - name: Install package
        id: install
        if: steps.pull-request.outputs.result
        run: |
          # github-actions-managed: true
          npm install -g npm
          npm ci
      - name: Build package
        id: build
        if: steps.pull-request.outputs.result && steps.scripts.outputs.build
        run: |
          # github-actions-managed: true
          echo "Running: npm run ${{ steps.scripts.outputs.build }}"
          npm run ${{ steps.scripts.outputs.build }}
      - name: Publish new version to NPM
        id: publish
        if: steps.pull-request.outputs.result
        env:
          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
        run: |
          # github-actions-managed: true
          npm publish --access public --verbose