How to use the ESLint annotations?

Comienza revisando el YAML del workflow y los scripts de package.json mostrados en el issue, especialmente el comando eslint:github-action y su salida. Comprueba la documentación existente del repositorio o el comportamiento de la action con respecto a las anotaciones de ESLint y documenta si esta configuración debería producir anotaciones en los pull requests y qué configuración se requiere.

It's my first time using the annotations feature, so please forgive me if this issue is irrelevant.

I'm trying to have annotations in the PR, however all I can get is a simple annotation in the actions screen with irrelevant information. I'm guessing that's a problem of mine, and since there's not a lot documentation (that I could find) about this might as well ask.

That's the output of a failing eslint job. The current configuration is:

  quality:
    needs: [build]

    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v1

      - uses: actions/setup-node@v1
        with:
          node-version: "12.x"

      - name: Cache node modules
        id: cache
        uses: actions/cache@v1
        with:
          path: node_modules # npm cache files are stored in `~/.npm` on Linux/macOS
          key: ${{ runner.os }}-node_modules-${{ hashFiles('**/package-lock.json') }}
          restore-keys: |
            ${{ runner.os }}-build-${{ env.cache-name }}-
            ${{ runner.os }}-build-
            ${{ runner.os }}-

      - name: Install Dependencies
        if: steps.cache.outputs.cache-hit != 'true'
        run: npm ci

      - name: Prettier
        run: npm run fmt:check

      - name: ESlint
        run: npm run eslint:github-action

where my package.json looks like:

  "devDependencies": {
    "@typescript-eslint/eslint-plugin": "^2.12.0",
    "@typescript-eslint/parser": "^2.12.0",
    "eslint": "^6.7.2",
    "eslint-config-prettier": "^6.7.0",
    "prettier": "^1.19.1",
    "serverless-dynamodb-local": "^0.2.38",
    "serverless-offline": "^5.12.1",
    "serverless-plugin-typescript": "^1.1.9",
    "typescript": "^3.7.3"
  },
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "lint": "eslint functions/**.ts",
    "eslint:github-action": "eslint functions/**",
    "fmt": "prettier --write ./**.{json,js,ts,yml,md}",
    "fmt:check": "prettier --check ./**.{json,js,ts,yml,md}"
  },

I expected that the following error would actually appear in the annotation, and hopefully in the PR too.

 /home/runner/work/utom.is/utom.is/functions/a.ts
  1:0  error  Parsing error: Declaration or statement expected

but as you can get the from screenshot, all I have is that the process completed with error 1.

Is my expectation wrong? Or do I have something misconfigured?

Thanks