Stub Webpack config. ES6, babel, sass, css modules (working version)

webpack.config.js

//Dev config ONLY

var path = require('path'); // eslint-disable-line no-var
var webpack = require('webpack'); // eslint-disable-line no-var
var merge = require('webpack-merge'); // eslint-disable-line no-var
var HtmlWebpackPlugin = require('html-webpack-plugin'); // eslint-disable-line no-var
var NpmInstallPlugin = require('npm-install-webpack-plugin'); // eslint-disable-line no-var
var autoprefixer = require('autoprefixer'); // eslint-disable-line no-var
var ExtractTextPlugin = require('extract-text-webpack-plugin'); // eslint-disable-line no-var


const TARGET = process.env.npm_lifecycle_event;
console.log("target event is " + TARGET, 'in', __dirname);

var common = {
  cache: false,
  debug: true,
  watch: true,
  entry: './src/index.js',
  resolve: {
    extensions: ['','.js']
  },
  output: {
    path: './build',
    devtoolLineToLine : true,
    pathinfo          : true,
    path              : __dirname,
    filename          : 'bundle.js',
    sourceMapFilename : '[file].map'
  },
  module: {
    loaders: [{
      test: /\.js[x]?$/,
      loaders: ['babel-loader?presets[]=es2015'],
      exclude: /(node_modules|bower_components)/
    }, 
    {
        test: /\.css$/,
        loader: 'style!css?modules&localIdentName=[name]---[local]---[hash:base64:5]'
      },
      {
        test: /\.scss$/,
        loader: ExtractTextPlugin.extract('style', 'css?modules&importLoaders=1&localIdentName=[name]__[local]!sass'),
        exclude: /node_modules|lib/,
      },
    {
      test: /\.woff$/,
      loader: "url-loader?limit=10000&mimetype=application/font-woff&name=[path][name].[ext]"
    }, {
      test: /\.woff2$/,
      loader: "url-loader?limit=10000&mimetype=application/font-woff2&name=[path][name].[ext]"
    }, {
      test: /\.(eot|ttf|svg|gif|png)$/,
      loader: "file-loader"
    }]
  },
  plugins: [
     new ExtractTextPlugin('app.css', {
        allChunks: true
      }),
      //new webpack.optimize.UglifyJsPlugin({minimize: true}),
      new HtmlWebpackPlugin({
        title: 'Prototype',
        inject: true,
        template: './src/index.html'
      })
  ],
  postcss: function() {
    return [autoprefixer({
      browsers: ['last 2 versions']
    })];
  }
  };

if (TARGET === 'dev' || !TARGET) {
  module.exports = merge(common, {
    devtool: 'source-map',
    devServer: {
      historyApiFallback: true,
      colors:true,
      contentBase:        './',
      historyApiFallback: true,
      inline:             true,
      progress:           true
    },
    output: {
      publicPath: 'http://localhost:8080/'
    },
    plugins: [
      new NpmInstallPlugin({
        save: true // --save
      })
      
    ]
  });
}

if (TARGET === 'build') {
  module.exports = merge(common, {
    devtool: 'source-map',
    output: {
      path: './build'
    },
    plugins: [
    
    ]
  });
}