Webpack config file for React and ES6

react_es6_webpack.config.js

var webpack = require('webpack');
module.exports = {
    context: __dirname + "/src",
    entry: "./app.js",

    output: {
        filename: "app.js",
        path: __dirname + "/build",
    },

    module: {
        loaders: [
            {
                test: /\.(es6|js)$/,
                exclude: /node_modules/,
                loaders: ["babel-loader"],
            }
        ],
    },

    resolve : {
        extensions : ['', '.js', '.es6']
    },

    plugins: [
        new webpack.optimize.UglifyJsPlugin({
            compress: {
                warnings: false
            }
        }),

        new webpack.DefinePlugin({
            'process.env': {
                'NODE_ENV': JSON.stringify('production')
            }
        })
    ],
    watch : true
}