AngularJS controller using TypeScript

gistfile1.js

/// <reference path="../Scripts/typings/angularjs/angular.d.ts" />

module App {
    export class TestCtrl {
        private startTime: string;

        constructor(private $scope: ITestCtrlScope) {
            this.startTime = new Date().toLocaleString();

            $scope.message = "Hello there at " + this.startTime;

            // Make sure this is scopped to the controller in the btnClick function
            $scope.btnClick = angular.bind(this, this.btnClick);
        }

        btnClick($scope: any) {
            $scope.message = "Clicked from " + this.startTime;
            this.fn();
        }

        fn() {
            alert("Clicked from " + this.startTime);
        }
    }

    export interface ITestCtrlScope extends ng.IScope {
        message: string;
        btnClick: Function;
    }
}