Why won't my Jquery work?

Question

I have Jquery here, it claims the auto grow function is not recognized even though it should be. Please help/give me a suggestion for what to do.
I'm quite fluent in js but new to jquery.

Code in question:
https://code.sololearn.com/WrsGp7uUWgLu/#html

Answer 1

I think jQuery doesn't have that function :

You can see
https://plugins.jquery.com/autogrow/