webpack.config.js

var debug = process.env.NODE_ENV !== "production";
var webpack = require('webpack');
var path = require('path');

module.exports = {
  context: path.join(__dirname, "src"),
  devtool: debug ? "inline-sourcemap" : null,
  entry: "./app/js/app.js",
  module: {
    loaders: [
      {
        test: /\.js$/,
        exclude: /(node_modules|bower_components)/,
        loader: 'babel-loader',
      },
      { test: /\.css$/, loader: "style-loader!css-loader" },
      { test: /\.sass$/, loader: "style-loader!css-loader!sass-loader" },
      {
        test: /\.(jpe?g|png|gif|svg)$/i,
        loaders: [
          'file?hash=sha512&digest=hex&name=built/[hash].[ext]'
        ]
      }
    ]
  },
  output: {
    path: path.join(__dirname, "src"),
    filename: "built/app.js"
  },
  plugins: debug ? [] : [
    new webpack.optimize.DedupePlugin(),
    new webpack.optimize.OccurenceOrderPlugin(),
    new webpack.optimize.UglifyJsPlugin({ minimize: true, mangle: false, sourcemap: false, compress: {warnings: false} }),
  ],
};