src/language-graphql/printer-graphql.js/printDirectives
function printDirectives(path, print, n) {
  if (n.directives.length === 0) {
    return "";
  }

  return concat([
    " ",
    group(
      indent(
        concat([
          softline,
          join(
            concat([ifBreak("", " "), softline]),
            path.map(print, "directives")
          )
        ])
      )
    )
  ]);
}