Javascript detect scrollbar in textarea

Question

I was wondering if anybody knows how I would go about detecting when the scrollbar appears inside a textarea.

I am currently using mootools for my JavaScript and I am having issues getting it to detect a scrollbar.

user_8714729 · Answer

For React I've found https://github.com/andreypopp/react-textarea-autosize

import Textarea from 'react-textarea-autosize';
...

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