Function fN

resources/vega.min.js:30217–30220

(t, e, n)

    for (const e in n) lN(t, e, n[e], "update");
  }
  function fN(t, e, n) {
    for (const r in e) (n && ut(n, r)) || (t[r] = ot(t[r] || {}, e[r]));
    return t;
  }
  function hN(t, e) {
    return e && ((e.enter && e.enter[t]) || (e.update && e.update[t]));
  }