How to simplify expression for checking object’s fields for undefined value in typescript?

I need to check the textAreaRef.current and textAreaRef.current.resizableTextArea for undefined value.

That works:

if (textAreaRef.current && textAreaRef.current.resizableTextArea) {
  const currentCursorPosition = textAreaRef.current.resizableTextArea.textArea.selectionStart;
}

But that don’t:

function isTextAreaExists() {
  return textAreaRef.current && textAreaRef.current.resizableTextArea;
}

if (isTextAreaExists()) {
  const currentCursorPosition = textAreaRef.current.resizableTextArea.textArea.selectionStart;
}

TS18047: textAreaRef.current is possibly null
TS18048: textAreaRef.current.resizableTextArea is possibly null

Are there ways to simplify the expression?