feat(router): add support for lazily loaded modules

modules/@angular/router/src/utils/collection.ts

@@ -6,6 +6,14 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
+import 'rxjs/add/operator/concatAll';
+import 'rxjs/add/operator/last';
+
+import {Observable} from 'rxjs/Observable';
+import {of } from 'rxjs/observable/of';
+
+import {PRIMARY_OUTLET} from '../shared';
+
 export function shallowEqualArrays(a: any[], b: any[]): boolean {
   if (a.length !== b.length) return false;
   for (let i = 0; i < a.length; ++i) {
@@ -77,4 +85,34 @@ export function forEach<K, V>(
       callback(map[prop], prop);
     }
   }
+}
+
+export function waitForMap<A, B>(
+    obj: {[k: string]: A}, fn: (k: string, a: A) => Observable<B>): Observable<{[k: string]: B}> {
+  const waitFor: Observable<B>[] = [];
+  const res: {[k: string]: B} = {};
+
+  forEach(obj, (a: A, k: string) => {
+    if (k === PRIMARY_OUTLET) {
+      waitFor.push(fn(k, a).map((_: B) => {
+        res[k] = _;
+        return _;
+      }));
+    }
+  });
+
+  forEach(obj, (a: A, k: string) => {
+    if (k !== PRIMARY_OUTLET) {
+      waitFor.push(fn(k, a).map((_: B) => {
+        res[k] = _;
+        return _;
+      }));
+    }
+  });
+
+  if (waitFor.length > 0) {
+    return of (...waitFor).concatAll().last().map((last) => res);
+  } else {
+    return of (res);
+  }
 }