Function lookupRef

resources/vega.min.js:31688–31690

(t, e)

        return EL(t, this, "vals", "values", e, n || !0);
      },
      lookupRef(t, e) {
        return EL(t, this, "lookup", "tupleindex", e, !1);
      },
      indataRef(t, e) {
        return EL(t, this, "indata", "tupleindex", e, !0, !0);
      },