Method mapLayerOrUnit

resources/vega-lite.min.js:4435–4439

(e, t)

                : this.mapLayerOrUnit(e, t);
    }
    mapLayerOrUnit(e, t) {
      if (il(e)) return this.mapLayer(e, t);
      if (Ua(e)) return this.mapUnit(e, t);
      throw new Error(Bn(e));
    }
    mapLayer(e, t) {
      return { ...e, layer: e.layer.map((e) => this.mapLayerOrUnit(e, t)) };
    }