D3 V4 gallery library implementation with dependencies

Hello everyone,

I'm trying to implement an example library from the D3 gallery called Visavail. A demo of this library can be found here: link.

I'm having difficulties getting it to work, any help or pointers will be appriciated. 

Setup:

• Installed Moment with npm
• Installed D3 V4 with npm
• Added Visavail library to the node_modules folder
• Added font-awesome tot the style folder

Then I referenced it all in pbiviz.json:

  "externalJS": [
    "node_modules/powerbi-visuals-utils-dataviewutils/lib/index.js",
	  "node_modules/d3/build/d3.min.js",
    "node_modules/visavail/js/visavail.js",
    "node_modules/moment/min/moment-with-locales.min.js"
  ],
  "style": "style/visual.less",
  "capabilities": "capabilities.json",
  "dependencies": "dependencies.json",
  "stringResources": []

The CSS was referenced in the visual.less file:

@import (less) "style/font-awesome/css/font-awesome.min.css";
@import (less) "node_modules/visavail/css/visavail.css";

The code:

In Visual.ts, based on the hello world update counter I recreated the Visavail example with static data. 

module powerbi.extensibility.visual {
    "use strict";
    export class Visual implements IVisual {
        private target: HTMLElement;
        private settings: VisualSettings;

        private d3;
        private visavail;
        private moment;
        private svg;
        private mydataset;
        private chart;

        constructor(options: VisualConstructorOptions) {
            console.log('Visual constructor', options);
            this.target = options.element;
            
            this.d3 = (window as any).d3;
            this.visavail = (window as any).visavail;
            this.moment = (window as any).moment;

            this.moment.locale("en");

            this.svg = this.d3.select(this.target).append('svg');

        }

        public update(options: VisualUpdateOptions) {
            this.settings = Visual.parseSettings(options && options.dataViews && options.dataViews[0]);
            this.target.innerHTML = '<p id="example">TEST</em></p>';
            
            this.chart = this.visavail.visavailChart().width(800);

            this.mydataset = [{
                "measure": "Annual Report", 
                "data": [
                    ["2015-01-01", 0, "2015-03-04"],
                    ["2016-01-01", 1, "2016-03-03"],
                    ["2017-01-01", 1, "2017-03-06"],
                    ["2018-01-01", 1, "2018-04-01"]
                ]
            }];

            this.d3.select("#example").datum(this.mydataset).call(this.chart);
        }

        private static parseSettings(dataView: DataView): VisualSettings {
            return VisualSettings.parse(dataView) as VisualSettings;
        }

        public enumerateObjectInstances(options: EnumerateVisualObjectInstancesOptions): VisualObjectInstance[] | VisualObjectInstanceEnumerationObject {
            return VisualSettings.enumerateObjectInstances(this.settings || VisualSettings.getDefault(), options);
        }
    }
}

• Am I referencing the dependencies correctly?
• Am I importing the dependencies correctly?
• Am I implementing the dependencies correctly?
• How do I debug this?

I zipped the entire project, it can be downloaded here:

https://www.dropbox.com/s/aggbcdm4vnooy8h/statisTimeLine2.zip?dl=0