webpack.common.js

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

module.exports = {
  entry: './src/app.js',
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'bundle.[contenthash].js'
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader', 'postcss-loader']
      }
    ]
  },
  plugins: [
    new HtmlWebpackPlugin({
      favicon: './src/images/coronavirus.svg',
      template: './src/template.html',
      filename: 'index.html'
    })
  ],
  optimization: {
    splitChunks: {
      chunks: 'async',
      minSize: 20000,
      minRemainingSize: 0,
      minChunks: 1,
      maxAsyncRequests: 30,
      maxInitialRequests: 30,
      enforceSizeThreshold: 50000,
      cacheGroups: {
        vendors: {
          test: /node_modules/,
          chunks: 'initial',
          filename: 'vendors.[contenthash].js',
          priority: 1,
          maxInitialRequests: 2,
          minChunks: 1
        }
      }
    }
  }
}