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