问TypeScript 2.0:如何引用同一名称空间中的对象，但引用子文件夹中的对象？

EN

directives
> d1
  > d1.directive.ts
  > d1.scss
> _bootstrap_directives.ts
> d2.directive.ts

> d1.directive.ts (d2.directive is the same with a different class name and no scss import)

import './d1.scss'; // for webpack
namespace MyLibrary.Directives {
    export class D1Directive implements ng.IDirective {
        restrict: string = 'A';
        scope: boolean = false;

        constructor() {
            // noop
        }
        static factory(): ng.IDirectiveFactory {
            const directive = () => {
                return new D1Directive();
            }
            return directive;
        }
    }
}

> _bootstrap_directives.ts (

// Property 'D1Directive' does not exist on type 'typeof Directives'. 
import './d1/d1.directive';  // for webpack
angular.module('myLibrary')
    .directive('d1', MyLibrary.Directives.D1Directive.factory()); 

// This one works
import './d2.directive'; // for webpack
angular.module('myLibrary')
    .directive('d2', MyLibrary.Directives.D2Directive.factory());