webpack.config.js

webpacck = require("webpack");
var path = require("path");
module.exports = {
  entry: path.resolve(__dirname, "app"),
  output: {
    path: __dirname + "/dist",
    publicPath: "/",
    filename: "bundle.js"
  },
  devtool: 'cheap-eval-source-map',  
  devServer: {
    contentBase: path.resolve(__dirname, "public")
  },
  module: {
    loaders: [
      { test: /\.js$/, exclude: /node_modules/, loaders: ["babel-loader"] }
    ]
  }
};