How to use the d3-geo.geoDistance function in d3-geo

// geoContains(...) =======================================================

let contained: boolean = d3Geo.geoContains(samplePolygon, [0, 0]);
contained = d3Geo.geoContains(sampleSphere, [0, 0]);
contained = d3Geo.geoContains(sampleGeometryCollection, [0, 0]);
contained = d3Geo.geoContains(sampleExtendedGeometryCollection, [0, 0]);
contained = d3Geo.geoContains(sampleFeature, [0, 0]);
contained = d3Geo.geoContains(sampleExtendedFeature1, [0, 0]);
contained = d3Geo.geoContains(sampleExtendedFeature2, [0, 0]);
contained = d3Geo.geoContains(sampleFeatureCollection, [0, 0]);
contained = d3Geo.geoContains(sampleExtendedFeatureCollection, [0, 0]);

// geoDistance(...) =======================================================

const distance: number = d3Geo.geoDistance([54, 2], [53, 1]);

// geoLength(...) =========================================================

let length: number = d3Geo.geoLength(samplePolygon);
length = d3Geo.geoLength(sampleSphere);
length = d3Geo.geoLength(sampleGeometryCollection);
length = d3Geo.geoLength(sampleExtendedGeometryCollection);
length = d3Geo.geoLength(sampleFeature);
length = d3Geo.geoLength(sampleExtendedFeature1);
length = d3Geo.geoLength(sampleExtendedFeature2);
length = d3Geo.geoLength(sampleFeatureCollection);
length = d3Geo.geoLength(sampleExtendedFeatureCollection);

// geoInterpolate(...) ====================================================

const interpolateFct: (t: number) => [number, number] = d3Geo.geoInterpolate([54, 2], [53, 1]);

// geoContains(...) =======================================================

let contained: boolean = d3Geo.geoContains(samplePolygon, [0, 0]);
contained = d3Geo.geoContains(sampleSphere, [0, 0]);
contained = d3Geo.geoContains(sampleGeometryCollection, [0, 0]);
contained = d3Geo.geoContains(sampleExtendedGeometryCollection, [0, 0]);
contained = d3Geo.geoContains(sampleFeature, [0, 0]);
contained = d3Geo.geoContains(sampleExtendedFeature1, [0, 0]);
contained = d3Geo.geoContains(sampleExtendedFeature2, [0, 0]);
contained = d3Geo.geoContains(sampleFeatureCollection, [0, 0]);
contained = d3Geo.geoContains(sampleExtendedFeatureCollection, [0, 0]);

// geoDistance(...) =======================================================

const distance: number = d3Geo.geoDistance([54, 2], [53, 1]);

// geoLength(...) =========================================================

let length: number = d3Geo.geoLength(samplePolygon);
length = d3Geo.geoLength(sampleSphere);
length = d3Geo.geoLength(sampleGeometryCollection);
length = d3Geo.geoLength(sampleExtendedGeometryCollection);
length = d3Geo.geoLength(sampleFeature);
length = d3Geo.geoLength(sampleExtendedFeature1);
length = d3Geo.geoLength(sampleExtendedFeature2);
length = d3Geo.geoLength(sampleFeatureCollection);
length = d3Geo.geoLength(sampleExtendedFeatureCollection);

// geoInterpolate(...) ====================================================

const interpolateFct: (t: number) => [number, number] = d3Geo.geoInterpolate([54, 2], [53, 1]);

function distanceFromAirports(airportCode1, airportCode2) {
  return (
    geoDistance(
      [
        airportIataCodeToCoordinates(airportCode1).longitude,
        airportIataCodeToCoordinates(airportCode1).latitude,
      ],
      [
        airportIataCodeToCoordinates(airportCode2).longitude,
        airportIataCodeToCoordinates(airportCode2).latitude,
      ]
    ) * 6371 // To convert great-arc distance (in radians) into km.
      + detourConstant
  );
}

markers.map((x, i) => {
      const areaCoords = [x.longitude, x.latitude];
      const distance = d3.geoDistance(areaCoords, projection.invert([width / 2, height / 2]));
      const sphereCoords = projection(areaCoords);
      const isActive = activeMarkerId === x.id;
      // eslint-disable-next-line
      const fill = distance > 1.57 ? 'none' : isActive ? colors.activeMarker : colors.marker;
      const radius = isActive ? 9 : 6;
      return (

public distance(pointA: IGeoPoint, pointB: IGeoPoint): number {
		return d3geo.geoDistance([pointA.longitude, pointA.latitude], [pointB.longitude, pointB.latitude]);
	}

geoDistance(p1, p2) {
    return geoDistance(p1, p2);
  },
  geoLength(feature) {

v.find = function(x, y, radius) {
    v._found = v.delaunay.find(x, y, v._found);
    if (!radius || geoDistance([x, y], v.points[v._found]) < radius)
      return v._found;
  };

function find0(lambda, phi) {
    var d0 = Infinity;
    var found = -1;
    for (var i = 0; i < faces.length; i++) {
      var d = distance(faces[i].site, [lambda, phi]);
      if (d < d0) {
        d0 = d;
        found = i;
      }
    }
    return found;
  }