check-dist.yml

# In TypeScript actions, `dist/index.js` is a special file. When you reference
# an action with `uses:`, `dist/index.js` is the code that will be run. For this
# project, the `dist/index.js` file is generated from other source files through
# the build process. We need to make sure that the checked-in `dist/index.js`
# file matches what is expected from the build.
#
# This workflow will fail if the checked-in `dist/index.js` file does not match
# what is expected from the build.
name: Check dist/

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

jobs:
  check-dist:
    name: Check dist/
    runs-on: ubuntu-latest

    permissions:
      contents: read
      statuses: write

    steps:
      - name: Checkout
        id: checkout
        uses: actions/checkout@v4

      - name: Setup Node.js
        uses: actions/setup-node@v3
        with:
          node-version: 18
          cache: npm

      - name: Install Dependencies
        id: install
        run: npm ci

      - name: Build dist/ Directory
        id: build
        run: npm run bundle

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

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