No errors and no review comments

[mscrivo]

Hi, I'm struggling a bit to get this working on changed files only (to keep it fast). My action looks like this:

name: reviewdog
on: [pull_request]
jobs:
  reviewdog:
    name: runner
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: write
    steps:
      - uses: actions/checkout@v4
      - uses: pnpm/action-setup@v4
        with:
          version: 9
          run_install: false

      - name: Install Node.js
        uses: actions/setup-node@v4
        with:
          node-version: 20
          cache: 'pnpm'
      - name: Install dependencies
        run: pnpm install

      - id: files
        uses: Ana06/get-changed-files@v2.3.0
      - name: Get changed JS files
        run: |
          matching_files=()
          for changed_file in ${{ steps.files.outputs.added_modified }}; do
            if [[ "$changed_file" =~ \.(js|jsx|ts|tsx)$ ]]; then
              matching_files+=("$changed_file")
            fi
          done
          # Set env var to be used in next step
          echo "CHANGED_JS_FILES=${matching_files[@]}" >> $GITHUB_ENV
      - run: |
          # If I run this line, it does show the eslint errors I expect
          # npx --no-install -c "eslint ${{ env.CHANGED_JS_FILES }}"
      - uses: reviewdog/action-eslint@v1
        with:
          github_token: ${{ secrets.GITHUB_TOKEN }}
          reporter: github-pr-review
          level: error
          eslint_flags: "${{ env.CHANGED_JS_FILES }}"

As mentioned in the code above, if I uncomment the step that does: npx --no-install -c "eslint ${{ env.CHANGED_JS_FILES }}" it correctly shows eslint errors in stdout, but when running through the next step, it provides no output, no errors and there are no review comments.

I know it's not a permissions issue, since I have another action for reviewdog-shellcheck using the same token, and that one works perfectly fine.

Any clue what I'm doing wrong here?