Strict Mode Warning

[RussMax783]

Nice work on such a simple component!

With all the latest of React and this library there is a warning when a snackbar gets toggle on.
Warning: findDOMNode is deprecated in StrictMode. findDOMNode was passed an instance of n which is inside StrictMode. Instead, add a ref directly to the element you want to reference. Learn more about using refs safely here: https://fb.me/react-strict-mode-find-node

Quick sandbox to show the error.
https://codesandbox.io/s/react-simple-snackbar-broken-9m9lm?file=/src/App.js

[juspky]

This is caused by react-transition-group
reactjs/react-transition-group#668

Bump the dep once this is is fixed

[juspky]

reactjs/react-transition-group#668 (comment)

this needs to be done.
@evandromacedo

[architgarg]

I had the same problem. Now started using this - https://react-hot-toast.com/