public function appendProperty($property) {
    if (is_string($property)) {
      $property = ClassMemberListNode::create($property);
    }
    $properties = $this->statements->children(Filter::isInstanceOf('\Pharborist\ClassMemberListNode'));
    if ($properties->count() === 0) {
      $this->statements->firstChild()->after($property);
    }
    else {
      $properties->last()->after($property);
    }
    FormatterFactory::format($this);
    return $this;
  }