can you leverage an ArcGIS geometry service in Esri Leaflet?

[jgravois]

a clientside library like turf.js is usually a better option, but you can also make calls to geometry services.

the only catch is that you need to convert back and forth between GeoJSON and Esri flavored JSON on your own.

// https://developers.arcgis.com/rest/services-reference/convex-hull.htm
  L.esri.request(`http://sampleserver6.arcgisonline.com/arcgis/rest/services/Utilities/Geometry/GeometryServer/convexHull`, {
    geometries: {
      geometryType: "esriGeometryPoint",
      geometries: arcgisPoints
    },
    sr: 4326
  }, function(err, response) {
    L.geoJSON(L.esri.Util.arcgisToGeoJSON(response)).addTo(map)
  })

https://jsbin.com/tupunux/edit?html,output