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"} ] } }