feat: Expose $route to the watchers

Author: MattCCC

src/router-service.ts

@@ -283,6 +283,8 @@ export class RouterService {
    */
   public setCurrentRoute(route: Route): void {
     this.currentRoute = route;
+
+    this.vm.$route = Object.assign(this.vm.$route, route);
   }
 
   /**

src/vue-router.common.ts

@@ -41,6 +41,13 @@ export const createRouter = (
     proto.$routeTo = router.push.bind(router);
     proto.$routeBack = router.back.bind(router);
     proto.$router = router;
+
+    const route = (Vue as any).observable({
+      name: '',
+      path: '',
+    });
+
+    proto.$route = route;
   }
 
   if (vm.mixin) {