Create a file webpack.config.js in the root of your working directory

Filename: webpack.config.js

module.exports = {entry: __dirname + "/src/index.jsx",devtool: "source-map",output: {path: __dirname + "/build",filename: "bundle.js"},module: {loaders: [{test: /\\.jsx?$/, exclude: /node_modules/, loader: "babel-loader"}]}}