Set Base URL as string or as function.

angular2-rest.d.ts

@@ -1,5 +1,7 @@
+/// <reference path="node_modules/angular2/typings/browser.d.ts" />
 import { Http, Request } from "angular2/http";
 import { Observable } from "rxjs/Observable";
+import 'rxjs/add/operator/map';
 /**
 * Angular 2 RESTClient class.
 *
@@ -31,7 +33,7 @@ export declare class RESTClient {
  * Set the base URL of REST resource
  * @param {String} url - base URL
  */
-export declare function BaseUrl(url: string): <TFunction extends Function>(Target: TFunction) => TFunction;
+export declare function BaseUrl(url: string | Function): <TFunction extends Function>(Target: TFunction) => TFunction;
 /**
  * Set default headers for every method of the RESTClient
  * @param {Object} headers - deafult headers in a key-value pair

angular2-rest.ts

@@ -1,3 +1,4 @@
+///<reference path="node_modules/angular2/typings/browser.d.ts"/>
 /*
 
 angular2-rest
@@ -35,6 +36,7 @@ Response,
 URLSearchParams
 } from "angular2/http";
 import {Observable} from "rxjs/Observable";
+import 'rxjs/add/operator/map';
 
 /**
 * Angular 2 RESTClient class.
@@ -82,13 +84,19 @@ export class RESTClient {
  * Set the base URL of REST resource
  * @param {String} url - base URL
  */
-export function BaseUrl(url: string) {
-    return function <TFunction extends Function>(Target: TFunction): TFunction {
-        Target.prototype.getBaseUrl = function() {
+export function BaseUrl(url: string|Function) {
+    let urlFunction:string|Function = function() {
             return url;
-        };
-        return Target;
     };
+
+    if (typeof url === "function") {
+        urlFunction = url;
+    }
+
+    return function <TFunction extends Function>(Target: TFunction): TFunction {
+        Target.prototype.getBaseUrl = urlFunction;
+        return Target;
+    }
 }
 
 /**