angularjs – Angular 1.5 $onInit not firing – typescript

Javascript版本(工作)：

angular
    .module('app')
    .component('appProductList',{
        templateUrl: '/src/product-list/product-list.component.html',controller: ProductListController
    });

function ProductListController($location,ProductService) {
    var ctrl = this;

    ctrl.$onInit = init;
    ctrl.selectProduct = selectProduct;

    function init(){
        ctrl.products = [];

        ProductService.getProducts()
            .then(res => {
                ctrl.products = res.data;
            },error => console.log(error));
    }

    function selectProduct(product){
        $location.path('/product/' + product.id);
    }
}

TypeScript版本($onInit永远不会触发)：

angular
    .module('app')
    .component('appProductList',controller: ProductListController
    });

class ProductListController{
    products: Array<Product>;

    constructor(private $location: ng.ILocationService,private ProductService: ProductService) {}

    $onInit() {
        this.products = new Array<Product>();

        this.ProductService.getProducts()
            .then((res: ng.IHttpPromiseCallbackArg<Array<Product>>) => {
                this.products = res.data;
            },error => console.log(error));
    } 

    selectProduct(product){
        this.$location.path('/product/' + product.id);
    }
}