Cesium GeoJSON update

HTML

<script src="https://cesiumjs.org/Cesium/Build/Cesium/Cesium.js"></script>
<link rel="stylesheet" href="https://cesiumjs.org/Cesium/Build/Cesium/Widgets/widgets.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/Turf.js/5.1.5/turf.min.js"></script>
<div id="cesiumContainer"></div>

CSS

html {
          height: 100%;
      }
      body {
          padding: 0;
          margin: 0;
          overflow: hidden;
          height: 100%;
      }
      #cesiumContainer{
        height: 100%;
      }

JavaScript

const viewer = new Cesium.Viewer('cesiumContainer', {
 terrainProvider: Cesium.createWorldTerrain(),
});

const centerLatitude = 27.988257;
const centerLongitude = 86.925145;
const size = 0.2;

const cesiumPointsArray = [
	centerLongitude + size, centerLatitude + size,
	centerLongitude + size, centerLatitude - size,
	centerLongitude - size, centerLatitude - size,
	centerLongitude - size, centerLatitude + size,
];
const turfPointsArray = [];
for(let i = 0; i < cesiumPointsArray.length; i += 2){
	turfPointsArray.push([cesiumPointsArray[i], cesiumPointsArray[i+1]]);
}
turfPointsArray.push([cesiumPointsArray[0], cesiumPointsArray[1]]);

const cesiumPolygon = viewer.entities.add({
    polygon : {
        hierarchy : Cesium.Cartesian3.fromDegreesArray(cesiumPointsArray),
        material : Cesium.Color.BLUE.withAlpha(0.2),
    }
});

viewer.zoomTo(viewer.entities);

function getMinAndMaxHeightPointsInPolygon(accuracy) {
	return new Promise((reoslve, reject) => {
  	const polygon = turf.polygon([turfPointsArray]);
    let grid = turf.pointGrid(turf.bbox(polygon), accuracy.level, {units: accuracy.units});
    let pointsInPolygon = turf.pointsWithinPolygon(grid, polygon);
    console.log(pointsInPolygon.features.length);

    const pointsWithHeight = Cesium.sampleTerrainMostDetailed(
      Cesium.createWorldTerrain(), //viewer.terrainProvider
      pointsInPolygon.features.map(point => 
        new Cesium.Cartographic.fromDegrees(point.geometry.coordinates[0], point.geometry.coordinates[1]))
    );
    
    pointsWithHeight.then(res => reoslve(re))

    /* pointsWithHeight.then(res => {
      const topHeightPosition = res.reduce((topHeightPosition, currentPosition) => 
        !topHeightPosition || currentPosition.height > topHeightPosition.height  ? currentPosition : topHeightPosition, undefined);
      const minHeightPosition = res.reduce((topHeightPosition, currentPosition) => 
        !topHeightPosition || currentPosition.height < topHeightPosition.height  ?...