Method getSizeSignalRef

resources/vega-lite.min.js:12041–12065

(e)

      return ((n[t] = (n[t] || 0) + 1), t);
    }
    getSizeSignalRef(e) {
      if (Um(this.parent)) {
        const t = At(Hf(e)),
          n = this.component.scales[t];
        if (n && !n.merged) {
          const e = n.get("type"),
            i = n.get("range");
          if (kr(e) && kn(i)) {
            const e = n.get("name"),
              i = ym(vm(this, t));
            if (i) {
              return {
                signal: Vf(
                  e,
                  n,
                  ma({ aggregate: "distinct", field: i }, { expr: "datum" }),
                ),
              };
            }
            return (Si(Xn(t)), null);
          }
        }
      }
      return { signal: this.signalNameMap.get(this.getName(e)) };
    }
    lookupDataSource(e) {
      const t = this.component.data.outputNodes[e];
      return t ? t.getSource() : e;