webpack.prod.js

const merge = require('webpack-merge')
const base = require('./webpack.base')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')

const config = merge(base, {
  mode: 'production',
  output: {
    filename: '[name].[contenthash].js'
  },
  optimization: {
    splitChunks: {
      cacheGroups: {
        styles: {
          name: 'index',
          test: /\.css$/,
          chunks: 'all',
          enforce: true
        }
      }
    }
  },
  module: {
    rules: [
      {
        test: /\.css$/,
        exclude: /node_modules/,
        use: [
          MiniCssExtractPlugin.loader,
          'css-loader',
          {
            loader: 'postcss-loader',
            options: {
              plugins: [
                require('tailwindcss'),
                require('autoprefixer'),
                require('@fullhuman/postcss-purgecss')({
                  content: ['./src/index.js'],
                  // Include any special characters you're using in this regular expression
                  defaultExtractor: content =>
                    content.match(/[\w-/:]+(?<!:)/g) || []
                })
              ]
            }
          }
        ]
      }
    ]
  },
  plugins: [
    new MiniCssExtractPlugin({
      filename: '[name].[contenthash].css'
    })
  ]
})

module.exports = config