Function empty

main.js:280–289

(obj)

function escapeRegExp (string) {
  return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
}

function empty (obj) {
  if (typeof obj === 'object') {
    for (const key in obj) {
      if (obj.hasOwnProperty(key)) {
        return false;
      }
    }
  }
  return true;
}