{
  "name": "tetris",
  "version": "1.0.0",
  "devDependencies": {
    "eslint": "^4.0.0",
    "webpack": "^2.6.1"
  }
}

{
  "name": "tetris",
  "version": "1.0.0",
  "devDependencies": {
    "eslint": "^4.0.0",
    "webpack": "^2.6.1"
  },
  "scripts": {
    "lint": "eslint js/src/*.js",
    "build": "webpack"
  }
}

Add 2 npm run commands: lint (eslint all files), and build (webpack js files into app.bundle.js)
Add 2 npm run commands: lint (eslint all files), and build (webpack js files into app.bundle.js)
