webpack.config.js

var path = require('path');
var HtmlWebpackPlugin = require('html-webpack-plugin');
var precss = require('precss');
var autoprefixer = require('autoprefixer');
var webpack = require('webpack');

var sMap = '';
if (process.env.NODE_ENV !== 'production') {
  sMap = '?sourceMap';
}

var config = {
  entry: './app/index.js',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'index_bundle.js',
    publicPath: '/'
  },
  devtool: 'source-map',
  module: {
    rules: [
      { test: /\.(js)$/, use: 'babel-loader' },
      { test: /\.scss$/, use: ['style-loader', 'css-loader'+sMap, 'postcss-loader'+sMap, 'sass-loader'+sMap]}
    ]   
  },
  devServer: {
    historyApiFallback: true
  },
  plugins: [new HtmlWebpackPlugin({
    template: 'app/index.html'
  })]
};


if (process.env.NODE_ENV === 'production') {
  config.plugins.push(
    new webpack.DefinePlugin({
      'process.env': {
        'NODE_ENV': JSON.stringify(process.env.NODE_ENV)
      }
    })
    // new webpack.optimize.UglifyJsPlugin()
  );
}

module.exports = config;