webpack full react web app config and npm packages

package.json

{
  "name": "WEB APP",
  "version": "1.0.0",
  "description": "DESCRIPTION",
  "main": "server.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "dev": "webpack-dev-server --inline",
    "start": "node_modules/.bin/babel-node server.js"
  },
  "repository": {
    "type": "git",
    "url": "git+https://github.com/kordano/WEBAPP.git"
  },
  "keywords": [
    "WEB",
    "APP"
  ],
  "author": "Konrad Kühne",
  "license": "ISC",
  "bugs": {
    "url": "https://github.com/kordano/WEBAPP/issues"
  },
  "babel": {
    "presets": [
      "react",
      "es2015"
    ]
  },
  "homepage": "https://github.com/kordano/WEBAPP#readme",
  "dependencies": {
    "express": "^4.13.3",
    "redis": "^2.4.2"
  },
  "devDependencies": {
    "babel-core": "^6.3.17",
    "babel-loader": "^6.2.0",
    "babel-preset-es2015": "^6.3.13",
    "babel-preset-react": "^6.3.13",
    "chai": "^3.4.1",
    "chai-immutable": "^1.5.3",
    "css-loader": "^0.23.0",
    "file-loader": "^0.8.5",
    "img-loader": "^1.2.2",
    "mocha": "^2.3.4",
    "node-sass": "^3.4.2",
    "react": "^0.14.3",
    "react-dom": "^0.14.3",
    "sass-loader": "^3.1.2",
    "style-loader": "^0.13.0",
    "url-loader": "^0.5.7",
    "webpack": "^1.12.9",
    "webpack-dev-server": "^1.14.0"
  }
}

webpack.config.js

var path = require('path'),
    node_modules = path.resolve(__dirname, 'node_modules'),
    contentBase = path.resolve(__dirname, 'dist');

var config = {
  entry: [
    path.resolve(__dirname, 'src', 'client', 'core.jsx')
  ],
  module: {
    loaders: [{
      test: /\.jsx?$/,
      exclude: [node_modules],
      loader: 'babel',
      query: {
        presets: ['react', 'es2015']
      }
    },{
      test: /\.scss$/,
      loader: 'style!css!sass'
    },{
      test: /\.png$/,
      loader: "url-loader?limit=100000"
    },{
      test: /\.jpg$/,
      loader: "file-loader"
    }]
  },
  resolve: {
    extensions: ['', '.js', '.jsx', 'css', 'sass', 'scss', 'png', 'jpeg']
  },
  output: {
    path: contentBase,
    publicPath: '/',
    filename: 'bundle.js'
  },
  devServer: {
    contentBase
  }
}

module.exports = config;