function isEmpty(node, sourceCode) {
  const start = node.startTag.range[1]
  const end = node.endTag == null ? node.range[1] : node.endTag.range[0]

  return sourceCode.text.slice(start, end).trim() === ''
}
Check whether the given element is empty or not.
This ignores whitespaces, doesn't ignore comments.
@param {VElement} node The element node to check.
@param {SourceCode} sourceCode The source code object of the current context.
@returns {boolean} `true` if the element is empty.