webpack.scss.config.js

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

const config = {
  mode: 'production',
  entry: {
    styles: ['./src/styles/index.ts'],
  },
  output: {
    path: path.resolve(__dirname, 'dist'),
    filename: '[name].js',
    libraryTarget: 'umd',
  },
  module: {
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        loader: 'babel-loader',
        options: {
          presets: ['es2015', 'react', 'stage-0'],
        },
      },
      {
        test: /\.ts?$/,
        use: 'ts-loader',
        exclude: /node_modules/,
      },
      {
        test: /\.scss$/i,
        use: [
          {
            loader: MiniCssExtractPlugin.loader,
          },
          'css-loader',
          'postcss-loader',
          'sass-loader',
        ],
      },
      {
        test: /\.css$/i,
        use: [
          {
            loader: MiniCssExtractPlugin.loader,
          },
          'css-loader?importLoaders=1!postcss-loader',
        ],
      },
    ],
  },
  optimization: {},
  plugins: [
    new MiniCssExtractPlugin({
      filename: `styles.css`,
    }),
  ],
};

module.exports = config;