How to bootstrap an Angular 2 application asynchronously

There is an excellent article of how to bootstrap an angular1 application asynchronously. This enables us to fetch a json from the server before bootstrapping.

The main code is here:

(function() {
    var myApplication = angular.module("myApplication", []);

    fetchData().then(bootstrapApplication);

    function fetchData() {
        var initInjector = angular.injector(["ng"]);
        var $http = initInjector.get("$http");

        return $http.get("/path/to/data.json").then(function(response) {
            myApplication.constant("config", response.data);
        }, function(errorResponse) {
            // Handle error case
        });
    }

    function bootstrapApplication() {
        angular.element(document).ready(function() {
            angular.bootstrap(document, ["myApplication"]);
        });
    }
}());

How do I achieve the same with Angular 2?