npm-publish-canary.yaml

name: Publish canary to NPM
on:
  pull_request:
    types:
      - opened
      - synchronize
    paths:
      - packages/**
  push:
    branches: [main]
    paths:
      - packages/**

jobs:
  publish-packages:
    runs-on: ubuntu-latest
    if: github.event.pull_request.head.repo.owner.login == 'livecycle' || github.event.repository.owner.login == 'livecycle'

    steps:
    - uses: actions/checkout@v4

    - uses: actions/setup-node@v3
      with:
        node-version: '18.x'
        cache: yarn

    - run: yarn

    - name: Set NPM token
      env:
        NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
      run: |
        echo "//registry.npmjs.org/:_authToken=${NPM_TOKEN}" >> .npmrc

    - name: Set git identity
      run: |
        # version git commit is not pushed, so this just needs to be configured
        git config user.email "$(git log -1 --format='%ae')"
        git config user.name "$(git log -1 --format='%an')"

    - name: npm publish
      run: |
        set -eou pipefail
        set -x

        REF="${{ github.head_ref }}"
        if [[ -z "$REF" ]]; then
          REF="${{ github.ref_name }}"
        fi

        # this will be the NPM dist-tag
        GIT_ID=$(echo "${REF}" | sed 's/[^a-zA-Z0-9_-]/-/g')

        # run 'lerna version' to get get next prerelease
        yarn -s lerna version prerelease --no-git-tag-version --preid $GIT_ID --ignore-scripts --exact --yes

        # modify the prerelease to include the git commit hash
        VERSION=$(jq -r .version lerna.json | sed -E "s/[^.]+$/$(git rev-parse --short HEAD)/")

        # run 'lerna version' again to actually set the version with the commit hash
        yarn -s lerna version $VERSION --no-git-tag-version --preid $GIT_ID --ignore-scripts --exact --yes

        # commit that goes nowhere
        git commit -m "canary version $VERSION" lerna.json packages/*/package.json

        # publish
        yarn -s lerna publish from-package --pre-dist-tag $GIT_ID --yes

        # undo the commit
        git reset --hard HEAD^1