action.yml

name: Tag on NPM Package Version Change
branding:
  icon: package
  color: green
description: Creates a new Git tag whenever the npm package version has changed.
inputs:
  git-user-email:
    description: Git user.email to use.
    default: 41898282+github-actions[bot]@users.noreply.github.com
  git-user-name:
    description: Git user.name.
    default: github-actions[bot]
  tag-prefix:
    description: Prefix prepended to the version in package.json
    default: v
runs:
  using: composite
  steps:
    - shell: bash
      run: |
        #!/bin/bash
        set -eux

        TAG="${TAG_PREFIX}$(cat package.json | jq -r '.version')"

        # In case only a shallow clone was done
        git fetch --tags

        if ! git tag | grep "${TAG}"; then
          git config user.name ${GIT_USER_NAME}
          git config user.email ${GIT_USER_EMAIL}

          git tag -a ${TAG} -m ${TAG}
          git push --follow-tags
        else
          echo "'${TAG}' already exists. No action taken."
        fi
      env:
        GIT_USER_NAME: ${{ inputs.git-user-name }}
        GIT_USER_EMAIL: ${{ inputs.git-user-email }}
        TAG_PREFIX: ${{ inputs.tag-prefix }}