JSFiddle - React, Tailwind, and code Playground

HTML

<textarea id="mytextarea">
asd

qwe
  asd
    
zxc
tyu    
hjk
</textarea>

JavaScript

var lines = $('#mytextarea').val().split(/\n/);
var texts = []
for (var i=0; i < lines.length; i++) {
  // only push this line if it contains a non whitespace character.
  if (/\S/.test(lines[i])) {
    texts.push($.trim(lines[i]));
  }
}

alert(JSON.stringify(texts));