I am using "document.getElementsByClassName" in a Lightning JS Renderer which returns a Proxy object. I can see the actual elements which I want in the debug console but I don't how to extract that element from a proxy object.
The screenshot of debug console
JSON.strigify() method will allow you to check values in proxy object. Also you can specify aura:id to the text area and you can access it using cmp.find("inputId").getElement() to get elments ehihc is the recommended in lightning.