webpack.client-no-css.config.js

const path = require('path')
const UglifyJsPlugin = require('uglifyjs-webpack-plugin')
const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin')
const MiniCssExtractPlugin = require('mini-css-extract-plugin')
const VueLoaderPlugin = require('vue-loader/lib/plugin')

module.exports = {
  mode: 'production',
  entry: path.resolve(__dirname, '../src/index.js'),
  devtool: 'source-map',
  output: {
    library: 'vue-js-modal',
    libraryTarget: 'umd',
    path: path.resolve(__dirname, '../dist'),
    publicPath: '/dist/',
    filename: 'index.nocss.js'
  },
  resolve: {
    extensions: ['.js']
  },
  optimization: {
    minimizer: [
      new UglifyJsPlugin({
        cache: true,
        parallel: true,
        sourceMap: true
      }),
      new OptimizeCSSAssetsPlugin({
        canPrint: true
      })
    ]
  },
  module: {
    rules: [
      {
        test: /\.vue$/,
        loader: 'vue-loader'
      },
      {
        test: /\.js$/,
        loader: 'babel-loader',
        exclude: /node_modules/
      },
      {
        test: /\.css$/,
        use: [MiniCssExtractPlugin.loader, 'css-loader']
      }
    ]
  },
  plugins: [
    new VueLoaderPlugin(),
    new MiniCssExtractPlugin({
      filename: 'styles.css'
    })
  ]
}