webpack.config.js

const path = require('path');
const webpack = require('webpack');
const UglifyJSPlugin = require('uglifyjs-webpack-plugin');
const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin;
const ExtractTextPlugin = require('extract-text-webpack-plugin');

module.exports = {
  context: path.resolve(__dirname, './src'),
  entry: {
    app: './app.js',
  },
  output: {
    filename: '[name].bundle.js',
    path: path.resolve(__dirname, './dist')
  },
  devServer: {
    contentBase: path.resolve(__dirname, './src'),
    disableHostCheck: true,
  },
  module: {
    rules: [
      {
        test: /\.scss$/,
        // use: ['style-loader', 'css-loader', 'sass-loader']
        loader: ExtractTextPlugin.extract('css-loader!sass-loader'),
      },
      {
        test: /\.(png|jpg|gif)$/,
        use: [
          {
            loader: 'url-loader',
            options: {
              limit: 8192
            }
          }
        ]
      }
    ]
  },
  plugins: [
    new UglifyJSPlugin(),
    new BundleAnalyzerPlugin({analyzerMode: 'disabled'}),
    new ExtractTextPlugin('styles.css')
  ]
};