How to use the ESLint annotations?

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

[Couto]

I might be wrong, but as a consequence of this, this action doesn’t create annotations for typescript/* and react-hooks/* ESLint warning/errors.

Which means that it doesn’t annotate around 80% of real-world linting messages.

[Couto]

After some investigation:

Currently the error matchers require that ESLint errors have an error code in them:

{
  "regexp": "^(.+):\\sline\\s(\\d+),\\scol\\s(\\d+),\\s(Error|Warning|Info)\\s-\\s(.+)\\s\\((.+)\\)$",
  "file": 1,
  "line": 2,
  "column": 3,
  "severity": 4,
  "message": 5,
  "code": 6
}

However, not all ESLint error messages have associated codes, specially if it’s invalid JavaScript like:

const a = (a: number, b: number): number => a + b;

export const handler = () => {
  make javascript fail again
  async function foo(things) {
    const results = [];
    for (const thing of things) {
      // Bad: each loop iteration is delayed until the entire asynchronous operation completes
      results.push(await bar(thing));
    }
    return baz(results);
  }
};

The script above will result in the following error message:

> @1.0.0 eslint /home/runner/work/
> eslint --format=compact functions/**.ts

/home/runner/work/functions/a.ts: line 4, col 7, Error - Parsing error: ';' expected.

1 problem
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! utom.is@1.0.0 eslint: `eslint --format=compact functions/**.ts`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the utom.is@1.0.0 eslint script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/runner/.npm/_logs/2019-12-22T21_43_16_956Z-debug.log
##[error]Process completed with exit code 1.

While it has line and column, it has no error code associated.