LuCI repo ESLint JS/ON and MD Analysis workflow (openwrt/luci)

---
name: "LuCI repo ESLint JS/ON and MD Analysis"
 
on:
  push:
    branches: [ "master" ]
    path:
      - '**/*.json'
      - '**/*.js'
      - '**/*.md'
 
  pull_request:
    branches: [ "master" ]
    path:
      - '**/*.json'
      - '**/*.js'
      - '**/*.md'
 
permissions: {}
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  eslint:
    timeout-minutes: 30
    runs-on: latchkey-small
    steps:
      - name: Check out repository
        uses: actions/checkout@v6
        with:
          fetch-depth: 2
 
      - name: Set up Node.js
        uses: actions/setup-node@v6
        with:
          cache: 'npm'
          node-version: latest
 
      # eslint/json requires eslint@9 - 10 is coming.
      - name: Install ESLint
        run: |
          npm install --no-audit --no-fund --save-dev \
          eslint@9 \
          @eslint/json@latest \
          @eslint/js \
          @eslint/markdown \
          eslint-formatter-gha
 
      # - name: Run ESLint (on whole repo)
      #   run: npx eslint .
 
      - name: Run ESLint on changed files
        run: |
          if [ "${{ github.event_name }}" = "pull_request" ]; then
            BASE="${{ github.event.pull_request.base.sha }}"
            HEAD="${{ github.event.pull_request.head.sha }}"
          else
            # push event: always diff last commit
            BASE="$(git rev-parse HEAD~1 2>/dev/null || true)"
            HEAD="$(git rev-parse HEAD)"
          fi
 
          if [ -z "$BASE" ]; then
            FILES=$(git ls-files '*.js' '*.json' '*.md')
          else
            FILES=$(git diff --diff-filter=ACM --name-only "$BASE" "$HEAD" \
              | grep -E '\.(js|json|md)$' || true)
          fi
 
          if [ -z "$FILES" ]; then
            echo "No JS/JSON or MD files changed"
            exit 0
          fi
 
          echo "Linting files:"
          echo "$FILES"
 
          # One day we might need xargs with huge lists
          # echo "$FILES" | xargs npx eslint -f gha
 
          # Until then, do it simply so we can see which error relates to which file
          npx eslint $FILES