Power bi custom visual and leaflet library

I cloned power bi and leaflet project from GitHub and the following is the project link:
https://github.com/woodbuffalo/powerbi-leaflet

powerbi-leaflet/pbiviz.json

 {
    "visual": {
        "name": "wBRecoveryStatus",
        "displayName": "WB Recovery Status",
        "guid": "PBI_CV_7844889B_1C25_49B0_A895_4FF3BB38DCF1",
        "visualClassName": "LeafletMap",
        "version": "1.0.0",
        "description": "",
        "supportUrl": "",
        "gitHubUrl": ""
    },
    "apiVersion": "1.1.0",
    "author": {
        "name": "",
        "email": ""
    },
    "assets": {
        "icon": "assets/icon.png"
    },
    "externalJS": [],
    "style": "style/visual.less",
    "capabilities": "capabilities.json"
}

powerbi-leaflet/tsconfig.json

{
    "compilerOptions": {
        "allowJs": true,
        "emitDecoratorMetadata": true,
        "experimentalDecorators": true,
        "target": "ES5",
        "sourceMap": true,
        "out": "./.tmp/build/visual.js"
    },
    "files": [
        ".api/v1.1.0/PowerBI-visuals.d.ts",
        "src/Clients/Typedefs/d3/d3.d.ts",
        "src/Clients/Typedefs/jquery/jquery.d.ts",
        "src/Clients/Typedefs/jquery-visible/jquery-visible.d.ts",
        "src/Clients/Typedefs/leaflet/leaflet.d.ts",
        "src/visual.ts"
    ]
}

powerbi-leaflet/src/visual.ts

export class LeafletMap implements IVisual {
    private dataView: DataView;
    private map: L.Map;
    private basemap: L.TileLayer;
    private markerLayer: L.LayerGroup<L.CircleMarker>;

    constructor(options: VisualConstructorOptions) {
        console.log('constructor called');
        let $mapDiv = $('<div></div>')
            .attr('id', 'map')
            .css('height', 500)
            .css('width', 700);

        $(options.element).append($mapDiv);

        this.basemap = L.tileLayer('https://d5nra9v0s4zer.cloudfront.net/base-tiles-2016/{z}/{y}/{x}');

        this.map = L.map('map', {
            center: new L.LatLng(56.7050482, -111.4407939),
            zoom: 12,
            maxZoom: 18,
            minZoom: 12
        });

        this.map.addLayer(this.basemap);
    }

    public static converter(dataView: DataView) {
        const {columns, rows} = dataView.table;
        const c10 = d3.scale.category10();

        const datas = rows.map(function (row, idx) {
            let data = row.reduce(function (d, v, i) {
                const role = Object.keys(columns[i].roles)[0]
                d[role] = v;
                return d;
            }, {});

            data.color = c10(data.category);

            return data;
        });

        return datas;
    }

    public update(options: VisualUpdateOptions) {
        console.log('update called');

        $('#map')
            .css('height', options.viewport.height)
            .css('width', options.viewport.width);

        this.map.invalidateSize(true);

        if (!options.dataViews && !options.dataViews[0]) return;

        if (this.markerLayer) this.map.removeLayer(this.markerLayer);

        this.dataView = options.dataViews[0];
        const data = LeafletMap.converter(this.dataView);

        const markers = data.map(function (d) {
            const latlng = L.latLng([d.latitude, d.longitude]);
            let marker = L.circleMarker(latlng, {color: d.color, fillOpacity: 1});

            const category = d.category ? d.category : 'NA';
            marker.bindPopup(d.tooltip + ' : ' + category);
            marker.on('mouseover', function (evt) {
                marker.openPopup();
            });

            return marker;
        });

        this.markerLayer = L.layerGroup(markers);
        this.map.addLayer(this.markerLayer);
    }

    public destroy() {
        console.log('destroy called');
        this.map.remove();
    }
}

Everything is working fine but when I compiled the project the map is not rendered even when I added fields (lat, long), please advise!