react webpack config file, witch babel and sass

webpack.config.js

{
  "name": "webpack-demo",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "build": "webpack",
    "dev": "webpack-dev-server --devtool eval --progress --colors --hot --content-base build",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "babel-core": "^6.18.2",
    "babel-loader": "^6.2.8",
    "babel-preset-es2015": "^6.18.0",
    "babel-preset-react": "^6.16.0",
    "css-loader": "^0.26.0",
    "sass-loader": "^4.0.2",
    "style-loader": "^0.13.1",
    "webpack": "^1.13.3",
    "webpack-dev-server": "^1.16.2"
  },
  "dependencies": {
    "react": "^15.4.1",
    "react-dom": "^15.4.1"
  }
}