publish:
  image: node:latest
  stage: deploy
  rules:
    - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH || $CI_COMMIT_REF_NAME =~ /^v\d+\.\d+\.\d+.*$/
      changes:
        - package.json
  script:
    # If no .npmrc if included in the repo, generate a temporary one that is configured to publish to GitLab's NPM registry
    - |
      if [[ ! -f .npmrc ]]; then
        echo 'No .npmrc found! Creating one now. Please review the following link for more information: https://docs.gitlab.com/ee/user/packages/npm_registry/index.html#project-level-npm-endpoint-1'
        {
          echo "@${CI_PROJECT_ROOT_NAMESPACE}:registry=${CI_API_V4_URL}/projects/${CI_PROJECT_ID}/packages/npm/"
          echo "${CI_API_V4_URL#http*:}/projects/${CI_PROJECT_ID}/packages/npm/:_authToken=\${CI_JOB_TOKEN}"
        } >> .npmrc
      fi
    - echo "Created the following .npmrc:"; cat .npmrc

    # Extract a few values from package.json
    - NPM_PACKAGE_NAME=$(node -p "require('./package.json').name")
    - NPM_PACKAGE_VERSION=$(node -p "require('./package.json').version")

    # Validate that the package name is properly scoped to the project's root namespace.
    # For more information, see https://docs.gitlab.com/ee/user/packages/npm_registry/#package-naming-convention
    - |
      if [[ ! $NPM_PACKAGE_NAME =~ ^@$CI_PROJECT_ROOT_NAMESPACE/ ]]; then
        echo "Invalid package scope! Packages must be scoped in the root namespace of the project, e.g. \"@${CI_PROJECT_ROOT_NAMESPACE}/${CI_PROJECT_NAME}\""
        echo 'For more information, see https://docs.gitlab.com/ee/user/packages/npm_registry/#package-naming-convention'
        exit 1
      fi

    # Compare the version in package.json to all published versions.
    # If the package.json version has not yet been published, run `npm publish`.
    - |
      if [[ $(npm view "${NPM_PACKAGE_NAME}" versions) != *"'${NPM_PACKAGE_VERSION}'"* ]]; then
        npm publish
        echo "Successfully published version ${NPM_PACKAGE_VERSION} of ${NPM_PACKAGE_NAME} to GitLab's NPM registry: ${CI_PROJECT_URL}/-/packages"
      else
        echo "Version ${NPM_PACKAGE_VERSION} of ${NPM_PACKAGE_NAME} has already been published, so no new version has been published."
      fi