webpack.config.js

const HtmlWebpackPlugin = require('html-webpack-plugin')
const webpack = require('webpack')
const path = require('path')

const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const TerserPlugin = require('terser-webpack-plugin');

module.exports = {
  entry: {
    app: './src/index.js',
  },
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: '[name].bundle.js',
    clean: true
  },
  externals: {
    url: 'url',
  },
  devtool: 'source-map',
  optimization: {
    minimizer: [new TerserPlugin()],
    runtimeChunk: {
      name: 'runtime',
    },
    splitChunks: {
      chunks: 'async',
      minSize: 20000,
      minRemainingSize: 0,
      minChunks: 1,
      maxAsyncRequests: 30,
      maxInitialRequests: 30,
      enforceSizeThreshold: 50000,
      cacheGroups: {
        defaultVendors: {
          test: /[\\/]node_modules[\\/]/,
          priority: -10,
          reuseExistingChunk: true,
        },
        default: {
          minChunks: 2,
          priority: -20,
          reuseExistingChunk: true,
        },
      },
    },
  },
  devServer: {
    hot: true,
    open: false,
    historyApiFallback: true,
  },
  module: {
    rules: [
      {
        test: /\.riot$/,
        exclude: /node_modules/,
        use: [{
          loader: '@riotjs/webpack-loader',
          options: {
            hot: true
          }
        }]
      }, {
        test: /.(scss|css)$/,
        use: [{
          loader: MiniCssExtractPlugin.loader
        }, {
          loader: "css-loader",
            options: {
            sourceMap: false
          }
        }, {
          loader: "sass-loader",
          options: {
            sourceMap: false
          }
        }]
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: 'src/index.html'
    }),
    new webpack.HotModuleReplacementPlugin(),
    new MiniCssExtractPlugin({ filename:'[name].[chunkhash].css' }),
  ]
}