Two Tailwind Configs with Webpack

package.json

{
    "private": true,
    "scripts": {
        "dev": "npm run development",
        "development": "cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
        "watch": "npm run development -- --watch",
        "watch-poll": "npm run watch -- --watch-poll",
        "hot": "cross-env NODE_ENV=development node_modules/webpack-dev-server/bin/webpack-dev-server.js --inline --hot --config=node_modules/laravel-mix/setup/webpack.config.js",
        "prod": "npm run production",
        "production": "cross-env NODE_ENV=production node_modules/webpack/bin/webpack.js --no-progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js"
    },
    "devDependencies": {
        "@babel/core": "^7.3.3",
        "@babel/preset-env": "^7.3.1",
        "axios": "^0.18",
        "babel-loader": "^8.0.5",
        "bootstrap": "^4.0.0",
        "cross-env": "^5.1",
        "css-loader": "^2.1.0",
        "extract-text-webpack-plugin": "4.0.0-beta.0",
        "jquery": "^3.2",
        "lodash": "^4.17.5",
        "mini-css-extract-plugin": "^0.5.0",
        "popper.js": "^1.12",
        "postcss-loader": "^3.0.0",
        "resolve-url-loader": "^2.3.1",
        "sass": "^1.15.2",
        "sass-loader": "^7.1.0",
        "tailwindcss": "^0.7.4",
        "vue": "^2.5.17",
        "vue-loader": "^15.6.4",
        "vue-template-compiler": "^2.5.22",
        "webpack": "^4.29.5",
        "webpack-bundle-analyzer": "^3.0.4",
        "webpack-cli": "^3.2.3",
        "webpack-fix-style-only-entries": "^0.2.0",
        "webpack-manifest-plugin": "^2.0.4",
        "webpack-notifier": "^1.7.0"
    },
    "browserslist": [
        "> 1%"
    ]
}

webpack.config.js

const VueLoaderPlugin = require('vue-loader/lib/plugin');
const ManifestPlugin = require('webpack-manifest-plugin');
const WebpackNotifierPlugin = require('webpack-notifier');
const ExtractTextPlugin = require('extract-text-webpack-plugin');

const ExtractTailwindA = new ExtractTextPlugin('css/tailwindA.css');
const ExtractTailwindB = new ExtractTextPlugin('css/tailwindB.css');

module.exports = (env, argv) => ({
  entry: {
    'js/app': [
      './resources/js/app.js',
      './resources/tailwind/tailwindA.css',
      './resources/tailwind/tailwindB.css',
    ],
  },
  output: {
    path: `${__dirname}/public`,
    publicPath: '/',
    filename: '[name].js',
    chunkFilename: 'js/[name]-[chunkhash].js',
  },
  module: {
    rules: [
    {
      test: /\.vue$/,
      use: 'vue-loader',
    },
    {
      test: /\.js$/,
      use: {
        loader: 'babel-loader',
        options: {
          presets: ['@babel/preset-env'],
          plugins: [],
        },
      },
      exclude: /node_modules/,
    },
    {
      test: `${__dirname}/resources/tailwind/tailwindA.css`,
      use: ExtractTailwindA.extract({
        use: [
          'css-loader',
          {
            loader: 'postcss-loader',
            options: {
              plugins: () => [
                require('tailwindcss')('./resources/tailwind/tailwind.configA.js'),
              ],
            },
          },
        ]
      })
    },
    {
      test: `${__dirname}/resources/tailwind/tailwindB.css`,
      use: ExtractTailwindB.extract({
        use: [
          'css-loader',
          {
            loader: 'postcss-loader',
            options: {
              plugins: () => [
                require('tailwindcss')('./resources/tailwind/tailwind.configB.js'),
              ],
            },
          },
        ]
      })
    },
    ],
  },
  resolve: {
    extensions: ['.vue', '.js', '.css'],
    alias: {
      vue$: 'vue/dist/vue.esm.js',
    },
  },
  plugins: [
    new VueLoaderPlugin(),
    ExtractTailwindA,
    ExtractTailwindB,
    new WebpackNotifierPlugin({
      alwaysNotify: true,
      excludeWarnings: true,
    }),
    new ManifestPlugin({
      fileName: 'mix-manifest.json',
      basePath: '/',
      publicPath: '/',
    }),
  ],
})

https://laracasts.com/discuss/channels/elixir/multiple-tailwind-configs-for-theming