webpack.prod.js

const webpack = require('webpack')
const path = require('path')

/*
 * We've enabled Postcss, autoprefixer and precss for you. This allows your app
 * to lint  CSS, support variables and mixins, transpile future CSS syntax,
 * inline images, and more!
 *
 * To enable SASS or LESS, add the respective loaders to module.rules
 *
 * https://github.com/postcss/postcss
 *
 * https://github.com/postcss/autoprefixer
 *
 * https://github.com/jonathantneal/precss
 *
 */

const autoprefixer = require('autoprefixer')
const precss = require('precss')

/*
 * We've enabled MiniCssExtractPlugin for you. This allows your app to
 * use css modules that will be moved into a separate CSS file instead of inside
 * one of your module entries!
 *
 * https://github.com/webpack-contrib/mini-css-extract-plugin
 *
 */

const MiniCssExtractPlugin = require('mini-css-extract-plugin')

/*
 * SplitChunksPlugin is enabled by default and replaced
 * deprecated CommonsChunkPlugin. It automatically identifies modules which
 * should be splitted of chunk by heuristics using module duplication count and
 * module category (i. e. node_modules). And splits the chunks…
 *
 * It is safe to remove "splitChunks" from the generated configuration
 * and was added as an educational example.
 *
 * https://webpack.js.org/plugins/split-chunks-plugin/
 *
 */

module.exports = {
  module: {
    rules: [
      {
        test: /\.js$/,
        include: [path.resolve(__dirname, 'src')],
        loader: 'babel-loader',

        options: {
          presets: [
            ['env',
              {
                'targets': {
                  'node': 'current'
                },
                modules: false
              }]
          ],

          plugins: ['syntax-dynamic-import']
        }
      },
      {
        test: /\.css$/,

        use: [
          {
            loader: MiniCssExtractPlugin.loader
          },
          {
            loader: 'css-loader',

            options: {
              sourceMap: true,
              importLoaders: 1
            }
          },
          {
            loader: 'postcss-loader',

            options: {
              plugins: function () {
                return [precss, autoprefixer]
              }
            }
          }
        ]
      }
    ]
  },

  mode: 'production',

  optimization: {
    splitChunks: {
      chunks: 'async',
      minSize: 30000,
      minChunks: 1,
      name: false,

      cacheGroups: {
        vendors: {
          test: /[\\/]node_modules[\\/]/,
          priority: -10
        }
      }
    }
  }
}