webpack.config.js

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

var extractPlugin = new ExtractTextPlugin({
    filename: 'main.css'
})

module.exports = {
    entry: './src/index.js',
    output: {
        path: path.resolve(__dirname, 'dist'),
        filename: 'bundle.js',
        publicPath: '/dist',
    },
    module: {
        rules: [
            {
                test: /\.(js|jsx)$/,
                use: [
                    {
                        loader: "babel-loader",
                        options: {         //conf for babel-loader
                            presets: ["react", "es2015", "stage-2"]
                        }
                    }
                ]
            },
            {
                test: /\.scss$/,
                use: extractPlugin.extract({
                    use: [ "css-loader", "sass-loader"]
                })
            }
        ]
    },
    plugins: [
        extractPlugin
    ]
}