src/language-js/print/property.js/printProperty
function printProperty(path, options, print) {
  const n = path.getValue();
  if (n.shorthand) {
    return path.call(print, "value");
  }

  return printAssignment(
    n.key,
    printPropertyKey(path, options, print),
    ":",
    n.value,
    path.call(print, "value"),
    options
  );
}