webpack.config.js

const path = require('path')
const { CleanWebpackPlugin } = require('clean-webpack-plugin')

module.exports = {
  mode: 'production',

  entry: {
    index: './src/index.js',
  },

  output: {
    filename: '[name].js',
    path: path.resolve(__dirname, 'lib'),
    libraryTarget: 'commonjs2',
  },

  module: {
    rules: [
      {
        test: /\.m?js$/,
        exclude: /(node_modules|bower_components)/,
        use: {
          loader: 'babel-loader',
          options: {
            presets: ['@babel/preset-env'],
          },
        },
      },
      {
        test: /\.css$/,
        use: ['style-loader', 'css-loader'],
      },
      {
        test: /\.scss$/,
        use: ['style-loader', 'css-loader', 'sass-loader'],
      },
      {
        test: /\.(ico|jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2)(\?.*)?$/,
        loader: 'url-loader',
        options: {
          limit: 50000,
          name: 'assets/images/[name].[ext]',
        },
      },
    ],
  },

  plugins: [new CleanWebpackPlugin()],
}