postcss.config.js

module.exports = {
    plugins: [
        require('postcss-import')({
            plugins: [
                require('stylelint')
            ]
        }),
        require('tailwindcss')('./tailwind.js'),
        require('autoprefixer')(),
    ],
}

webpack.config.js

// Node modules
const path = require('path');
const webpack = require('webpack');

// Webpack plugins
const CopyWebpackPlugin = require('copy-webpack-plugin');
const ManifestPlugin = require('webpack-manifest-plugin');
const VueLoaderPlugin = require('vue-loader/lib/plugin');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const MiniCssExtractPlugin = require("mini-css-extract-plugin");
const OptimizeCSSAssetsPlugin = require("optimize-css-assets-webpack-plugin");
const WorkboxPlugin = require('workbox-webpack-plugin');

// Config files
const pkg = require('./package.json');

module.exports = {
    entry: './src/js/app.js',
    mode: 'development',
    output: {
        filename: 'app.bundle.js',
        path: __dirname+'/web/dist/js',
    },
    optimization: {
        minimizer: [
            new OptimizeCSSAssetsPlugin({})
        ]
    },
    plugins: [
        new MiniCssExtractPlugin({
            filename: "[name].css",
            chunkFilename: "[id].css"
        })
    ],
    module: {
        rules:[
            {
                test: /\.css$/,
                use: [
                    {
                        loader: MiniCssExtractPlugin.loader,
                        options: {
                            // you can specify a publicPath here
                            // by default it use publicPath in webpackOptions.output
                            publicPath: './dist/css/'
                        }
                    },
                    "css-loader"
                ]
            },
            {
                test: /\.js$/,
                exclude: /(node_modules|bower_components)/,
                use: {
                    loader: 'babel-loader',
                    options: {
                        presets: ['@babel/preset-env']
                    }
                }
            }
        ]
    }
};