class RuboCop::LSP::Diagnostic

def length_of_line(line)
  if @document_encoding == Encoding::UTF_16LE
    line_length = 0
    line.codepoints.each do |codepoint|
      line_length += 1
      line_length += 1 if codepoint > RubyLsp::Document::Scanner::SURROGATE_PAIR_START
    end
    line_length
  else
    line.length
  end
end