Sample webpack 2 config

package.json

{
  "name": "jstest",
  "version": "1.0.0",
  "description": "",
  "main": "src/index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
  },
  "devDependencies": {
    "babel": "^6.5.2",
    "babel-loader": "^6.2.5",
    "babel-cli": "^6.14.0",
    "babel-plugin-transform-react-jsx": "^6.8.0",
    "babel-preset-es2015": "^6.9.4",
    "webpack": "^2.1.0-beta.22"
  }
}

webpack.config.js

const webpack = require('webpack');
const path = require('path');

const nodeEnv = process.env.NODE_ENV || 'development';
const isProd = nodeEnv === 'production';

module.exports = {
  devtool: isProd? 'source-map' : 'eval',
  context: path.join(__dirname, './src'),
  entry: {
    js: './index.js'
  },
  output: {
    path: path.join(__dirname, './'),
    filename: 'bundle.js'
  },
  module: {
    rules: [
      {
        test: /\.(js)$/,
        exclude: /(node_modules|\.spec\.)/,
        loader: 'babel-loader'
      }
    ]
  },
  resolve: {
    modules: [
      'node_modules',
      path.join(__dirname, './src')
    ]
  },
  plugins: [
    new webpack.LoaderOptionsPlugin({
      minimize: true,
      debug: false
    }),
    isProd? new webpack.optimize.UglifyJsPlugin({
      compress: {
        warnings: false
      },
      output: {
        comments: false
      },
      sourceMap: true
    }): null,
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: JSON.stringify(nodeEnv),
        PORT: JSON.stringify(process.env.PORT || 8080)
      }
    })
  ].filter(x => x != null)
};