I would like just link to libraries by src and use them without Node.JS or Webpack.
Sure, just use the service like unpkg:
<script crossorigin src="https://unpkg.com/react@17/umd/react.production.min.js"></script>
<script crossorigin src="https://unpkg.com/react-dom@17/umd/react-dom.production.min.js"></script>
<script crossorigin src="https://unpkg.com/[email protected]/dist/mobx.umd.production.min.js"></script>
<script crossorigin src="https://unpkg.com/[email protected]/dist/mobxreact.umd.production.min.js"></script>
It will be available through window.React
, window.ReactDOM
and etc.