Konstantin

According to react 16.9.0 `componentWillMount`, `componentWillReceiveProps` and `componentWillUpdate` were deprecated and will be removed in 17.x version https://alligator.io/react/whats-new-in-react-16.9/

> @korbav Why does the author advise using MUI ? Is there a similar component in MUI ? Because he is "CEO, co-founder at https://github.com/mui"

https://github.com/kartik-v/yii2-tree-manager - или слишком навороченный?