.babelrc.js

module.exports = {
  presets: [],
  plugins: [],
  env: {
    commonjs: {
      plugins: [
        'babel-plugin-add-module-exports',
      ],
      presets: [
        ['@babel/preset-env', {targets: {node: '8'}, modules: 'commonjs'}],
      ],
    },
    esm: {
      presets: [
        ['@babel/preset-env', {modules: false}],
      ],
    },
  },
};