webpack.config.js

const path = require("path");
const ExtractTextPlugin = require("extract-text-webpack-plugin");
const webpack = require("webpack");

module.exports = {
    entry: [
		"babel-polyfill",
		"./src/index.js", 
		"./src/styles/main.scss"
    ],
    output: {
        filename: "bundle.js",
        path: path.resolve(__dirname, "./public/dist")
    },
    module: {
        rules: [
            {
                test: /\.scss/,
                loader: ExtractTextPlugin.extract(["css-loader", "sass-loader"])
            },{
                test: /\.css/,
                loader: ExtractTextPlugin.extract(["css-loader", "sass-loader"])
            }, {
                test: /\.js$/,
                exclude: /node_modules/,
                loaders: "babel-loader",
                options: {
                    presets: [
                        "react", "stage-0", "es2015"
                    ],
                    plugins: ["transform-class-properties", "transform-decorators-legacy"]
                }
            }
        ]
    },
    devServer: {
        contentBase: "./public/",
        watchContentBase: true,
        historyApiFallback: true,
    },
    plugins: [
        new ExtractTextPlugin("bundle.css"), new webpack.DefinePlugin({
            "process.env.NODE_ENV": JSON.stringify("production")
        }),
        new webpack
            .optimize
            .UglifyJsPlugin()
    ]
};