webpack.config.base.js

const CircularDependencyPlugin = require('circular-dependency-plugin');
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');

module.exports = {
  module: {
    rules: [
      {
        exclude: /node_modules/,
        test: /\.js$/,
        use: [
          'babel-loader',
        ],
      },
      {
        test: /\.css$/,
        use: [
          'style-loader',
          'css-loader',
        ],
      },
      {
        test: /\.scss$/,
        use: [
          'style-loader',
          'css-loader',
          'sass-loader',
        ],
      },
    ],
  },
  optimization: {
    minimizer: [
      new UglifyJsPlugin({
        uglifyOptions: {
          output: {
            comments: false,
          },
        },
      }),
    ],
  },
  plugins: [
    new CircularDependencyPlugin({
      allowAsyncCycles: false,
      cwd: process.cwd(),
      exclude: /node_modules/,
      failOnError: true,
    }),
  ],
  resolve: {
    extensions: ['.js'],
  },
};