diff --git a/goldens/public-api/router/index.md b/goldens/public-api/router/index.md
index 83749ad7eefe43..5730cb40f3527f 100644
--- a/goldens/public-api/router/index.md
+++ b/goldens/public-api/router/index.md
@@ -133,7 +133,7 @@ export type CanActivateFn = (route: ActivatedRouteSnapshot, state: RouterStateSn
 // @public
 export interface CanDeactivate<T> {
     // (undocumented)
-    canDeactivate(component: T, currentRoute: ActivatedRouteSnapshot, currentState: RouterStateSnapshot, nextState?: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree;
+    canDeactivate(component: T, currentRoute: ActivatedRouteSnapshot, currentState: RouterStateSnapshot, nextState: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree;
 }
 
 // @public
diff --git a/packages/router/src/models.ts b/packages/router/src/models.ts
index b03366dc7904ad..75eae77193aa3f 100644
--- a/packages/router/src/models.ts
+++ b/packages/router/src/models.ts
@@ -6,14 +6,13 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {EnvironmentInjector, EnvironmentProviders, InjectionToken, NgModuleFactory, Provider, ProviderToken, Type} from '@angular/core';
+import {EnvironmentInjector, EnvironmentProviders, InjectionToken, NgModuleFactory, Provider, Type,} from '@angular/core';
 import {Observable} from 'rxjs';
 
 import {DeprecatedLoadChildren} from './deprecated_load_children';
 import {ActivatedRouteSnapshot, RouterStateSnapshot} from './router_state';
 import {UrlSegment, UrlSegmentGroup, UrlTree} from './url_tree';
 
-
 /**
  * Represents a route configuration for the Router service.
  * An array of `Route` objects, used in `Router.config` and for nested route configurations
@@ -74,7 +73,7 @@ export type UrlMatcher = (segments: UrlSegment[], group: UrlSegmentGroup, route:
  * @publicApi
  */
 export type Data = {
-  [key: string|symbol]: any
+  [key: string|symbol]: any;
 };
 
 /**
@@ -86,7 +85,7 @@ export type Data = {
  * @publicApi
  */
 export type ResolveData = {
-  [key: string|symbol]: any|ResolveFn<unknown>
+  [key: string|symbol]: any|ResolveFn<unknown>;
 };
 
 /**
@@ -139,7 +138,7 @@ export interface DefaultExport<T> {
  * @see [Route.loadChildren](api/router/Route#loadChildren)
  * @publicApi
  */
-export type LoadChildrenCallback = () => Type<any>|NgModuleFactory<any>|Routes|
+export type LoadChildrenCallback = () => |Type<any>|NgModuleFactory<any>|Routes|
     Observable<Type<any>|Routes|DefaultExport<Type<any>>|DefaultExport<Routes>>|
     Promise<NgModuleFactory<any>|Type<any>|Routes|DefaultExport<Type<any>>|DefaultExport<Routes>>;
 
@@ -185,7 +184,7 @@ export type QueryParamsHandling = 'merge'|'preserve'|'';
  * @publicApi
  */
 export type RunGuardsAndResolvers =
-    'pathParamsChange'|'pathParamsOrQueryParamsChange'|'paramsChange'|'paramsOrQueryParamsChange'|
+    |'pathParamsChange'|'pathParamsOrQueryParamsChange'|'paramsChange'|'paramsOrQueryParamsChange'|
     'always'|((from: ActivatedRouteSnapshot, to: ActivatedRouteSnapshot) => boolean);
 
 /**
@@ -463,7 +462,7 @@ export interface Route {
   /**
    * An object specifying a lazy-loaded component.
    */
-  loadComponent?: () => Type<unknown>| Observable<Type<unknown>|DefaultExport<Type<unknown>>>|
+  loadComponent?: () => | Type<unknown>| Observable<Type<unknown>|DefaultExport<Type<unknown>>>|
       Promise<Type<unknown>|DefaultExport<Type<unknown>>>;
   /**
    * Filled for routes `loadComponent` once the component is loaded.
@@ -851,7 +850,7 @@ export type CanActivateChildFn = (childRoute: ActivatedRouteSnapshot, state: Rou
 export interface CanDeactivate<T> {
   canDeactivate(
       component: T, currentRoute: ActivatedRouteSnapshot, currentState: RouterStateSnapshot,
-      nextState?: RouterStateSnapshot): Observable<boolean|UrlTree>|Promise<boolean|UrlTree>|boolean
+      nextState: RouterStateSnapshot): Observable<boolean|UrlTree>|Promise<boolean|UrlTree>|boolean
       |UrlTree;
 }
 
@@ -1179,7 +1178,6 @@ export interface CanLoad {
 export type CanLoadFn = (route: Route, segments: UrlSegment[]) =>
     Observable<boolean|UrlTree>|Promise<boolean|UrlTree>|boolean|UrlTree;
 
-
 /**
  * @description
  *