src/language-js/print/class.js/printSuperClass
function printSuperClass(path, options, print) {
  const printed = print("superClass");
  const parent = path.getParentNode();
  if (parent.type === "AssignmentExpression") {
    return group(
      ifBreak(["(", indent([softline, printed]), softline, ")"], printed)
    );
  }
  return printed;
}