name: PR
on: [pull_request]

jobs:
  pr:
    strategy:
      # Each step reports on its own; one red step must not cancel the others.
      fail-fast: false
      matrix:
        step: ['lint', 'test', 'build']
    runs-on: ubuntu-latest
    env:
      YARN_ENABLE_SCRIPTS: false
    steps:
    - uses: actions/checkout@v4
    - uses: actions/setup-node@v4
      with:
        node-version: 'lts/*'
    - name: ${{ matrix.step }}
      run: |
        corepack enable
        yarn install --immutable
        yarn ${{ matrix.step }}
    # `yarn lint` runs eslint --fix and `yarn build` rewrites packageInfo.ts,
    # so both pass on a tree they changed. The committed tree must already be
    # what they produce.
    - name: tree unchanged
      run: git diff --exit-code --stat
    # The package.json each build/ directory holds is what npm receives: entry
    # points must exist, no ./build/ or ./cjs/cjs/ paths, no workspace: ranges.
    - name: check built manifests
      if: matrix.step == 'build'
      run: python3 scripts/check-built-manifests.py .