Wijmo 5 - AngularJS directives

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
<link rel="stylesheet" href="https://cdn.grapecity.com/wijmo/5.latest/styles/wijmo.min.css">
<script src="https://cdn.grapecity.com/wijmo/5.latest/controls/wijmo.min.js"></script>
<script src="https://cdn.grapecity.com/wijmo/5.latest/controls/wijmo.grid.min.js"></script>
<script src="https://cdn.grapecity.com/wijmo/5.latest/controls/wijmo.chart.min.js"></script>
<script src="https://cdn.grapecity.com/wijmo/5.latest/interop/angular/wijmo.angular.min.js"></script>
<!-- mark this as an Angular application and give it a controller -->
<div ng-app="app" ng-controller="appCtrl" class="container">
    <wj-flex-grid items-source="data" control="grid" initialized="initGrid(s)">
        <wj-flex-grid-column header="Country" binding="country"></wj-flex-grid-column>
        <wj-flex-grid-column header="Code" binding="code"></wj-flex-grid-column>
        <wj-flex-grid-column header="Sales" binding="sales">
            <wj-flex-grid-cell-template cell-type="Cell" auto-size-rows="false">
                The sales in {{$item.country}} <br> {{$item.sales | currency}}
            </wj-flex-grid-cell-template>
        </wj-flex-grid-column>
        <wj-flex-grid-column header="Expenses" binding="expenses"></wj-flex-grid-column>
        <wj-flex-grid-column header="Downloads" binding="downloads"></wj-flex-grid-column>
    </wj-flex-grid>
</div>

CSS

.wj-flexgrid {
     height: 450px;
     width: auto;
     margin-bottom: 20px;
 }

 body {
     margin: 40px;
 }

TypeScript

// define app, include Wijmo 5 directives
var app = angular.module('app', ['wj']);

// controller
app.controller('appCtrl', function($scope) {
	
    $scope.grid = null;
    
    // create some random data
    var countries = 'US,Germany,UK,Japan,Italy,Greece'.split(','),
    		codes = 'AA,BB,AAA,CC'.split(","),
        data = [];
    for (var i = 0; i < 30; i++) {
        data.push({
        		country: countries[i % countries.length],
            code: codes[i % codes.length] + (Array.from({length: Math.ceil(Math.random() * 3)}).map(function(){
      								return i;
      						})).join(""),
            downloads: Math.round(Math.random() * 20000),
            sales: Math.random() * 10000,
            expenses: Math.random() * 5000
        });
    }

    // expose data as a CollectionView to get events
    $scope.data = new wijmo.collections.CollectionView(data);
		
    $scope.initGrid = function(s) {
    	let groupDescription = new wijmo.collections.PropertyGroupDescription("code", function(item, propName){
      let rgx = /^[a-z]+/i;
      	if(!item[propName] || !rgx.exec(item[propName])){
        	return item[propName];
        }
        
        return rgx.exec(item[propName])[0];
      });
      
    	s.collectionView.groupDescriptions.push(groupDescription);
    }
});