babel.config.js

const presets = [
  [
    '@babel/preset-env',
    {
      modules: false,
      targets: {
        ie: '11',
      },
    },
  ],
];

const plugins = [
  [
    '@babel/plugin-transform-runtime',
    {
      regenerator: true,
    },
  ],
];

// Jest is running in node environment, so we need additional plugins
const isJest = Boolean(process.env.JEST_WORKER_ID);
if (isJest) {
  plugins.push('@babel/plugin-transform-modules-commonjs');
}

module.exports = { sourceType: 'unambiguous', presets, plugins };