Added instantiated version of chart definition and cleaned up tests.

highcharts-ng/highcharts-ng-tests.ts

@@ -29,7 +29,7 @@ class AppController {
 		loading: true
 	};
 	constructor($timeout: ng.ITimeoutService) {
-		let vm = this;
+		var vm = this;
 		$timeout(function() {
 			//Some async action
 			vm.chartConfig.loading = false;

highcharts-ng/highcharts-ng.d.ts

@@ -33,5 +33,11 @@ interface HighChartsNGConfig {
 		height?: number;
 	};
 	//function (optional) - setup some logic for the chart
-	func?: (chart) => void;
+	func?: (chart: HighchartsChartObject) => void;
+}
+
+//Instantiated Chart
+interface HighChartsNGChart extends HighChartsNGConfig {
+	//This is a simple way to access all the Highcharts API that is not currently managed by this directive.
+	getHighcharts(): HighchartsChartObject;
 }