Function Uz

resources/vega.min.js:29615–29622

(t, e, n, r)

    return n.length ? n[0] : null;
  }
  function Uz(t, e, n, r) {
    let i = Lz(n, r);
    return (
      i ||
        ((i = xz(t, () => r(e, n.value))), (i.handler = r), t.on(n, null, i)),
      t
    );
  }
  function qz(t, e, n) {
    const r = Lz(e, n);
    return (r && e._targets.remove(r), t);