Angular 1.5 $ onInit not firing - typescript

Question

I am trying to convert parts of an Angular 1.5 application to TypeScript. I am not getting any errors, but the $ onInit () method no longer works. I include code that works (JavaScript) and does not work (TypeScript)

Javascript version (work):

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 version ($ onInit never works):

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

Answer 1

Answer, classes do not rise, so they must be declared before they are referenced.

In the MDN docs:

: , , - . , , , ReferenceError:

MDN: