textarea

One textarea plugin to rule them all.

Ace editor and CodeMirror are over the top. I just want tabs and block indentation.

And auto-expansion to fix the contents (height-wise).

Your <textarea> should specify min-height and max-height, but not height.

Alternatives

react-textarea-autosize, demo: apparently only handles newlines, so if your lines wrap, the height will be wrong.
react-textarea: derived from react-textarea-autosize
autosize: Looks nice, actually, but used to be jQuery?
react-autosize-textarea: This one seems to work.
angular2-autosize: super simple (3 lines of logic!), but works nicely at first glance.