eslint-brunch + eslint-config-standard

.eslintrc.js

module.exports = {
  extends: 'eslint-config-standard',
}

app.js

// Move this to `app/app.js`
console.log('hello, world!');

brunch-config.js

module.exports = {
  files: {
    javascripts: {
      joinTo: 'app.js'
    }
  }
};

package.json

{
  "private": true,
  "devDependencies": {
    "brunch": "^2.8.2",
    "eslint-brunch": "^3.10.0",
    "eslint-config-standard": "^6.1.0",
    "eslint-plugin-promise": "^2.0.1",
    "eslint-plugin-standard": "^2.0.0",
    "javascript-brunch": "^2.0.0"
  }
}