docs: def javascript_escape(s, quote_double_quotes=True):
      """
      Escape characters for javascript strings.
      """
      ustring_re = re.compile(u"([\u0080-\uffff])")
  
      def fix(match):
          return r"\u%04x" % ord(match.group(1))
  
      if type(s) == str:
          s = s.decode('utf-8')
      elif type(s) != six.text_type:
          raise TypeError(s)
      s = s.replace('\\', '\\\\')
      s = s.replace('\r', '\\r')
      s = s.replace('\n', '\\n')
      s = s.replace('\t', '\\t')
      s = s.replace("'", "\\'")
      if quote_double_quotes:
          s = s.replace('"', '&quot;')
      return str(ustring_re.sub(fix, s))