unique value renderer

elections-map-renderer.js

const renderer = new UniqueValueRenderer({
  valueExpression: "$feature.pred_party",
  defaultSymbol: createSymbol("lightgray"),
  uniqueValueInfos: partyCodes.map(party => {
    return {
      value: party.field,
      symbol: createSymbol(party.color)
    }
  })
});

function createSymbol(color: string) {
  return new SimpleMarkerSymbol({
    color: color,
    outline: {
      width: 0
    }
  });
}