webpack.config.babel.js

import webpack from 'webpack'
import path from 'path'
import HtmlWebpackPlugin from 'html-webpack-plugin'

const LAUNCH_COMMAND = process.env.npm_lifecycle_event

const isProduction = LAUNCH_COMMAND === 'production'
process.env.BABEL_ENV = LAUNCH_COMMAND

const PATHS = {
  app: path.join(__dirname, 'app'),
  build: path.join(__dirname, 'dist'),
}

const HTMLWebpackPluginConfig = new HtmlWebpackPlugin({
  template: PATHS.app + '/index.html',
  filename: 'index.html',
  inject: 'body',
})

const productionPlugin = new webpack.DefinePlugin({
  'process.env': {
    NODE_ENV: JSON.stringify('production'),
  },
})

const base = {
  entry: [
    PATHS.app,
  ],
  output: {
    path: PATHS.build,
    filename: 'index_bundle.js',
  },
  module: {
    loaders: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: 'babel-loader',
      },
      {
        test: /\.module\.scss$/,
        loaders: [
          'style',
          'css?modules&importLoaders=1&localIdentName=[path]___[name]__[local]___[hash:base64:5]',
          'resolve-url',
          'sass',
        ],
      },
      {
        test: /\.scss$/,
        exclude: /\.module\.scss$/,
        loaders: ['style', 'css', 'sass'],
      },
      {
        test: /\.css$/,
        loader: 'style-loader!css-loader',
      },
      {
        test: /\.(jpg|png)$/,
        loader: 'file?name=[path][name].[hash].[ext]',
      },
    ],
  },
  resolve: {
    root: path.resolve('./app'),
  },
}

const developmentConfig = {
  devtool: 'cheap-module-inline-source-map',
  devServer: {
    contentBase: PATHS.build,
    hot: true,
    inline: true,
    progress: true,
  },
  plugins: [HTMLWebpackPluginConfig, new webpack.HotModuleReplacementPlugin()],
}

const productionConfig = {
  devtool: 'cheap-module-source-map',
  plugins: [HTMLWebpackPluginConfig, productionPlugin],
}

export default Object.assign({}, base, isProduction === true ? productionConfig : developmentConfig)