(ArcGIS API for JavaScript) Sample of passing a feature set to a GPService (Event driven)

Sample.js

require(["esri/map",
    "esri/layers/FeatureLayer",
    "esri/tasks/QueryTask",
    "esri/tasks/query",
    "esri/tasks/Geoprocessor",
    "dojo/domReady!"
], function (Map, FeatureLayer, QueryTask, Query, Geoprocessor) {

    //Initializing the map constructor
    var map = new Map("map", {
        center: [-118, 34.5],
        zoom: 4,
        basemap: "topo"
    });

    var layer = new FeatureLayer("https://sampleserver6.arcgisonline.com/arcgis/rest/services/USA/MapServer/2");
    var url = "path to gp service";

    var query = new Query();
    query.returnGeometry = true;
    //query.where = "state_name = 'California'";
    query.where = "1=1";
    query.outFields = ["*"];

    var queryTask = new QueryTask("https://sampleserver6.arcgisonline.com/arcgis/rest/services/USA/MapServer/2");

    queryTask.execute(query);

    queryTask.on("complete", (result) => {
        console.log(result);
        executeTask(result.featureSet); //Passing in just result works as well
    });

    function executeTask(featuresSet) {
        console.log(featuresSet);
        var params = {
            //"Layers_to_Clip": "",
            "Area_of_Interest": featuresSet
        };
        var gpService = new Geoprocessor(url);
        gpService.execute(params, (e) => {
            alert(e[0].value.url);
        });

    }


});