将函数传递给Angular .factory方法时如何使用$ inject？

Question

我原来的代码看起来像这样（见下文）。注意$ inject语句。

 module app.common {
    interface IProductResource
        extends ng.resource.IResource<app.domain.IProduct> {

    }
    export class ResourceFactory {

        static $inject =["$resource"];
        constructor(private $resource: ng.resource.IResourceService) {
        }

        public getProductResource() : ng.resource.IResourceClass<IProductResource> {
            return this.$resource("/api/products/:productId");
        }
    }

    factory.$inject = ["$resource"];
    function factory($resource) : ResourceFactory {
        return new ResourceFactory($resource);
    }

    angular
        .module("common.services")
        .factory("resourceFactory",
                ["$resource",
                 factory]);
}

我的新代码利用了lambda语法，看起来像这样（见下文）。在这种情况下如何处理缩小问题？

 module app.common {
    interface IProductResource
        extends ng.resource.IResource<app.domain.IProduct> {

    }

    export class ResourceFactory {

        static $inject =["$resource"];
        constructor(private $resource: ng.resource.IResourceService) {
        }

        public getProductResource() : ng.resource.IResourceClass<IProductResource> {
            return this.$resource("/api/products/:productId");
        }
    }

    angular
        .module("common.services")
        .factory("resourceFactory",
                ["$resource",
                 ($resource)=>new ResourceFactory($resource)]);

}