ReactDOM.render is no longer supported in React 18. Use createRoot instead. Until you switch to the new API, your app will behave as if it's running React 17.

[Orangewithsugar]

Hi everyone, I'm currently learning about coffee editors, and after i built it and run it, it then follows this error:
ReactDOM.render is no longer supported in React 18. Use createRoot instead. Until you switch to the new API, your app will behave as if it's running React 17. Learn more: https://reactjs.org/link/switch-to-createroot

Is it because i made some mistakes during buiding steps ? How can i fix it?

[eneufeld]

Hi @Orangewithsugar ,
no mistake on your side. This is 'just' a warning as React 18 has some changes but the libraries we use didn't update yet to use the new APIs.
This should have no effect on the tool as long as you don't use any new features of React 18 .