webpack.config.js

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

var isProd = process.env.NODE_ENV === 'production';
var cssDev = ['style-loader', 'css-loader', 'sass-loader'];
var cssProd = ExtractTextPlugin.extract({
    fallback: 'style-loader',
    use: ['css-loader', 'sass-loader'],
    publicPath: '/dist'
});
var  cssConfig = isProd ? cssProd : cssDev;

module.exports = {
    entry: './src/app.js',
    output: {
        path: path.resolve(__dirname, './dist'),
        filename: 'app.bundle.js'
    },
    module: {
        rules: [
            {
                test: /\.scss$/,
                use: cssConfig
            },
            {
                test: /\.(gif|png|jpe?g|svg)$/i,
                use: [
                    'file-loader?name=images/[name].[ext]',
                    //'file-loader?name=[name].[ext]&outputPath=images/&publicPath=images/',
                    'image-webpack-loader'
                ]
            }
        ]
    },
    devServer: {
        contentBase: path.join(__dirname, "dist"),
        compress: true,
        hot: true,
        open: true
    },
    plugins: [
        new HtmlWebpackPlugin({ 
            title: 'Starter Webpack',
            hash: true,
            template: './src/index.html'
        }),
        new ExtractTextPlugin({
            filename: "app.css",
            disable: !isProd,
            allChunks: true
        }),
        new webpack.HotModuleReplacementPlugin(),
        new webpack.NamedModulesPlugin()
    ]
}