After upgrading to 4.0.0, when we try to use ref with MentionsInput, to access MentionsInput functions, we this error:

Function components cannot be given refs. Attempts to access this ref will fail. Did you mean to use React.forwardRef()?

Steps to reproduce:

1. Add ref to MentionsInput

Expected behaviour:

Allow to use ref with MentionsInput to access class functions

Observed behaviour:

Error written above

Workaround:

Add forwardRef to defaultStyle might help