cache/.github/workflows/check-dist.yml

# `dist/index.js` is a special file in Actions.
# When you reference an action with `uses:` in a workflow,
# `index.js` is the code that will run.
# For our project, we generate this file through a build process
# from other source files.
# We need to make sure the checked-in `index.js` actually matches what we expect it to be.
name: Check dist/

on:
  push:
    branches:
      - main
    paths-ignore:
      - '**.md'
  pull_request:
    paths-ignore:
      - '**.md'
  workflow_dispatch:

jobs:
  check-dist:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v3
      - name: Setup Node.js 16.x
        uses: actions/setup-node@v3
        with:
          node-version: 16.x
      - name: Determine npm cache directory
        id: npm-cache
        run: |
          echo "::set-output name=dir::$(npm config get cache)"
      - name: Restore npm cache
        uses: actions/cache@v3
        with:
          path: ${{ steps.npm-cache.outputs.dir }}
          key: check-dist-${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
          restore-keys: |
            check-dist-${{ runner.os }}-node-
      - name: Install dependencies
        run: npm ci
      - name: Rebuild the dist/ directory
        run: npm run build

      - name: Compare the expected and actual dist/ directories
        run: |
          if [ "$(git diff --ignore-space-at-eol dist/ | wc -l)" -gt "0" ]; then
            echo "Detected uncommitted changes after build.  See status below:"
            git diff
            exit 1
          fi
        id: diff

      # If index.js was different than expected, upload the expected version as an artifact
      - uses: actions/upload-artifact@v3
        if: ${{ failure() && steps.diff.conclusion == 'failure' }}
        with:
          name: dist
          path: dist/