dros/cypress/plugins/index.js

const webpackPreprocessor = require('@cypress/webpack-preprocessor');

module.exports = (on, config) => {
  const options = {
    webpackOptions: {
      output: {
        chunkFormat: 'commonjs',
      },
      target: 'node',
    },
  };

  on('file:preprocessor', webpackPreprocessor(options));
};