Need help getting D3 charts on Leaflet map

I'm creating a custom visual which requires doughnut chart to be displayed over a map. To start with I'm trying to replicate this.

http://bl.ocks.org/d3noob/9267535

It has circles over a leaflet map. I got the leaflet map working but D3 part doesn't work. Please help me with this. If I get the circles on the map I can later replace them with doughnuts.

Visual.ts

module powerbi.extensibility.visual {
    
    
    export interface Data{
        lat: number;
        lng: number;
        latlng: {};
        status: string[];
        itemCnt: number[];
    }

    export class Visual implements IVisual {
        private target: HTMLElement;
        private divMap: HTMLElement;
        private divTable: HTMLElement;
        private map: L.Map;
        private basemap: L.TileLayer;
        private layer: L.TileLayer;

        constructor(options: VisualConstructorOptions) {
            console.log('Visual constructor', options);
            this.target = options.element;
            this.divMap = document.createElement("div");
            this.divMap.id = "map";
            this.divMap.style.height = "100%";   
            this.divMap.style.width = "100%";
            options.element.appendChild(this.divMap);

            var L = typeof L !== 'undefined' ? L : window['L'];
            
            this.map = L.map('map');
            this.map.setView([-41.28,174.77], 11); 
            var mapLink = '<a href="http://openstreetmap.org">OpenStreetMap</a>';
            this.layer = L.tileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', { attribution: '&copy; ' + mapLink + ' Contributors', maxZoom: 18, });
            this.map.addLayer(this.layer);
        }


        public update(options: VisualUpdateOptions) {
            //update map size
            this.divMap.style.height = options.viewport.height.toString() + "px";
            this.divMap.style.width = options.viewport.width.toString() + "px";
            
            var svg = d3.select("#map").select("svg"),
            g = svg.append("g");
            
            var data: Data[] = [ 
                {lat:-41.28, lng:174.77, latlng:{}, status:['Under','Over','Normal'], itemCnt: [30,40,50]},
                {lat:-41.29, lng:174.76, latlng:{}, status:['Under','Over','Normal'], itemCnt: [30,30,60]},
                {lat:-41.23, lng:174.79, latlng:{}, status:['Under','Over','Normal'], itemCnt: [30,70,10]} 
            ];

            data.forEach(function(d) {
                d.latlng = new L.LatLng(<number>d.lat, <number>d.lng);
            })
            
            var circle= g.selectAll("circle")
                .data(data)
                .enter().append("circle")
                .style("stroke", "black")  
                .style("opacity", .6) 
                .style("fill", "red")
                .attr("r", 20)
                
            this.map.on("viewreset", update);
            update();

            function update() {
                circle.attr("transform", 
                function(d)  { 
                        return "translate("+ 
                        this.map.latLngToLayerPoint(new L.LatLng(d.lat, d.lng)).x +","+ 
                        this.map.latLngToLayerPoint(new L.LatLng(d.lat, d.lng)).y +")";
                        }
                )
            }
        }


    }
}

Visual.less

@import (less) "node_modules/leaflet/dist/leaflet.css";

Package.JSON

{
  "name": "visual",
  "version": "1.1",
  "dependencies": {
    "@types/d3": "^3.5.40",
    "d3": "^3.5.17",
    "geojson": "^0.5.0",
    "leaflet": "^1.3.1",
    "powerbi-visuals-utils-dataviewutils": "1.2.0"
  },
  "devDependencies": {
    "typescript": "^2.6.2"
  }
}

pbiviz.JSON

{
  "visual": {
    "name": "customMap",
    "displayName": "Custom Map",
    "guid": "custommap5A89ADFB5F694F71AB6D00C94383BB2B",
    "visualClassName": "Visual",
    "version": "1.0.0",
    "description": "",
    "supportUrl": "",
    "gitHubUrl": ""
  },
  "apiVersion": "1.10.0",
  "author": {
    "name": "",
    "email": ""
  },
  "assets": {
    "icon": "assets/icon.png"
  },
  "externalJS": [
    "node_modules/powerbi-visuals-utils-dataviewutils/lib/index.js",
    "node_modules/d3/d3.min.js",
    "node_modules/leaflet/dist/leaflet.js"
  ],
  "style": "style/visual.less",
  "capabilities": "capabilities.json",
  "dependencies": "dependencies.json",
  "stringResources": []
}