Apply featureEffect to a FeatureLayer

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        // this function is called when the map is loaded
        // then when user changes the histogram range slider thumbs
        function applyFeatureEffect(layer, where){
          layer.featureEffect = {
            filter: {
              where
            },
            includedEffect: "bloom(0.9 0.6pt 0)",
            excludedEffect: "blur(2.25pt) opacity(0.5)"
          };
        }

        // apply a feature effect to highlight the block groups that
        // fall within the age range
        slider.on(["thumb-change", "thumb-drag", "segment-drag"], (event) => {
          const layer = map.layers.getItemAt(0);
          applyFeatureEffect(layer, slider.generateWhereClause(field))
        });