arcgis api for js 4.11最新版featurelayer中数据源使用source时，heatMap怎么出不来，也不报错

const renderer = {

                        type: "heatmap",

                        filed:"num",

                        colorStops: [

                            { color: "rgba(63, 40, 102, 0)", ratio: 0 },

                            { color: "#472b77", ratio: 0.083 },

                            { color: "#4e2d87", ratio: 0.166 },

                            { color: "#563098", ratio: 0.249 },

                            { color: "#5d32a8", ratio: 0.332 },

                            { color: "#6735be", ratio: 0.415 },

                            { color: "#7139d4", ratio: 0.498 },

                            { color: "#7b3ce9", ratio: 0.581 },

                            { color: "#853fff", ratio: 0.664 },

                            { color: "#a46fbf", ratio: 0.747 },

                            { color: "#c29f80", ratio: 0.83 },

                            { color: "#e0cf40", ratio: 0.913 },

                            { color: "#ffff00", ratio: 1 }

                        ],

                        blurRadius : 8,

                        maxPixelIntensity: 10000,

                        minPixelIntensity: 0

                    };

                    //创建FeatureLayer图层

                    const featureLayer = new FeatureLayer({

                        source: features,

                        fields: [{

                            name: "num",

                            type: "integer",

                            alias: "num"

                        }],

                        objectIdField: "ObjectID",

                        geometryType: "point",

                        renderer: renderer

                    });