I have created the sample application using JS 4.17 APi version for creating circle and polygon on map using SKetchview.
(https://developers.arcgis.com/javascript/latest/sample-code/sandbox/index.html?sample=sketch-geometr...
)
sketch.on("create", function (event) {
// here i am getting event.graphics[0].geometry.rings[0] is in WKID - 3857 but i need it in 4326.
});
Please see the URL :- https://jsbin.com/sobudocupe/edit?html,output