refactor(router): move activation to private method (#22033)

PR Close #22033

packages/router/src/router.ts

@@ -712,14 +712,25 @@ export class Router {
             }
           });
 
+      this.activateRoutes(
+          routerState$, this.routerState, this.currentUrlTree, id, url, rawUrl, skipLocationChange,
+          replaceUrl, resolvePromise, rejectPromise);
+    });
+  }
 
+  /**
+   * Performs the logic of activating routes. This is a synchronous process by default. While this
+   * is a private method, it could be overridden to make activation asynchronous.
+   */
+  private activateRoutes(
+      state: Observable<{appliedUrl: string, state: RouterState, shouldActivate: boolean}>,
+      storedState: RouterState, storedUrl: UrlTree, id: number, url: UrlTree, rawUrl: UrlTree,
+      skipLocationChange: boolean, replaceUrl: boolean, resolvePromise: any, rejectPromise: any) {
     // applied the new router state
     // this operation has side effects
     let navigationIsSuccessful: boolean;
-      const storedState = this.routerState;
-      const storedUrl = this.currentUrlTree;
 
-      routerState$
+    state
         .forEach(({appliedUrl, state, shouldActivate}: any) => {
           if (!shouldActivate || id !== this.navigationId) {
             navigationIsSuccessful = false;
@@ -781,7 +792,6 @@ export class Router {
                 }
               }
             });
-    });
   }
 
   private resetStateAndUrl(storedState: RouterState, storedUrl: UrlTree, rawUrl: UrlTree): void {