ESLint Atom issue

app.js

function hello () {
  console.log("Hello World!");
}

hello()

package.json

{
  "eslintConfig": {
    "extends": "eslint:recommended",
    "env": {
      "browser": true
    },
    "rules": {
      "semi": 1
    }
  },
  "devDependencies": {
    "eslint": "^3.17.1"
  }
}

I downloaded this zip, installed the dependencies, opened the file in Atom, and got an error/warning as expected. I have to think there's something else going on in your environment or settings that is the culprit here.