Function JN

resources/vega.min.js:30425–30427

(t, e)

    return (t.id < 0 && (t.refs = t.refs || []).push(e), e);
  }
  function JN(t, e) {
    return e ? { $field: t, $name: e } : { $field: t };
  }
  const ZN = JN("key");
  function QN(t, e) {
    return { $compare: t, $order: e };