Function materialize

resources/vega.min.js:3847–3860

(t)

      );
    },
    materialize(t) {
      const e = this;
      return (
        1 & (t = t || 7) &&
          e.addF &&
          ((e.add = Ua(e.add, e.addF)), (e.addF = null)),
        2 & t && e.remF && ((e.rem = Ua(e.rem, e.remF)), (e.remF = null)),
        4 & t && e.modF && ((e.mod = Ua(e.mod, e.modF)), (e.modF = null)),
        16 & t &&
          e.srcF &&
          ((e.source = e.source.filter(e.srcF)), (e.srcF = null)),
        e
      );
    },
    visit(t, e) {
      const n = this,
        r = e;