Add @babel/plugin-transform-runtime

[vtaits]

https://babeljs.io/docs/en/next/babel-plugin-transform-runtime.html

You can reduce size of package using this plugin. For example:

Before

function _extends() { _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }

After

import _extends from "@babel/runtime/helpers/extends";

[bpas247]

It seems #296 closes this issue.