src/language-graphql/printer-graphql.js/clean
function clean(node, newNode /* , parent */) {
  // We print single line `""" string """` as multiple line string,
  // and the parser ignores space in multiple line string
  if (node.kind === "StringValue" && node.block && !node.value.includes("\n")) {
    newNode.value = newNode.value.trim();
  }
}