feat(router): Create APIs for using Router without RouterModule

This commit creates and exposes the APIs required to use the Angular Router without importing `RouterModule`.

The newly added APIs are tree-shakable and you can add features using special functions rather than using `ExtraOptions` to control the providers via an internal switch in Router code.

```
const appRoutes: Routes = [];
bootstrapApplication(AppComponent,
  {
    providers: [
      provideRouter(appRoutes,
        withDebugTracing(),     // enables debug tracing feature
        withInMemoryScrolling() // enables scrolling feature
    ]
  }
);
```

This "features" pattern allows for router behavior to evolve in a backwards compatible and tree-shakable way in the future. This approach also makes features more discoverable.

The newly added APIs can be used in any application today (doesn't require an application to be bootstrapped using standalone-based APIs).

Note: APIs added in this commit are released in the "Developer Preview" mode, read more about this mode in Angular docs: https://angular.io/guide/releases#developer-preview

goldens/public-api/router/index.md

@@ -210,6 +210,9 @@ export type Data = {
     [key: string | symbol]: any;
 };
 
+// @public
+export type DebugTracingFeature = RouterFeature<RouterFeatureKind.DebugTracingFeature>;
+
 // @public
 export class DefaultTitleStrategy extends TitleStrategy {
     constructor(title: Title);
@@ -234,6 +237,12 @@ export class DefaultUrlSerializer implements UrlSerializer {
 // @public
 export type DetachedRouteHandle = {};
 
+// @public
+export type DisabledInitialNavigationFeature = RouterFeature<RouterFeatureKind.DisabledInitialNavigationFeature>;
+
+// @public
+export type EnabledBlockingInitialNavigationFeature = RouterFeature<RouterFeatureKind.EnabledBlockingInitialNavigationFeature>;
+
 // @public
 type Event_2 = RouterEvent | NavigationStart | NavigationEnd | NavigationCancel | NavigationError | RoutesRecognized | GuardsCheckStart | GuardsCheckEnd | RouteConfigLoadStart | RouteConfigLoadEnd | ChildActivationStart | ChildActivationEnd | ActivationStart | ActivationEnd | Scroll | ResolveStart | ResolveEnd;
 export { Event_2 as Event }
@@ -275,21 +284,15 @@ export const enum EventType {
 }
 
 // @public
-export interface ExtraOptions {
-    anchorScrolling?: 'disabled' | 'enabled';
-    canceledNavigationResolution?: 'replace' | 'computed';
+export interface ExtraOptions extends InMemoryScrollingOptions, RouterConfigOptions {
     enableTracing?: boolean;
     errorHandler?: ErrorHandler;
     initialNavigation?: InitialNavigation;
     malformedUriErrorHandler?: (error: URIError, urlSerializer: UrlSerializer, url: string) => UrlTree;
-    onSameUrlNavigation?: 'reload' | 'ignore';
-    paramsInheritanceStrategy?: 'emptyOnly' | 'always';
     preloadingStrategy?: any;
     // @deprecated
     relativeLinkResolution?: 'legacy' | 'corrected';
     scrollOffset?: [number, number] | (() => [number, number]);
-    scrollPositionRestoration?: 'disabled' | 'enabled' | 'top';
-    urlUpdateStrategy?: 'deferred' | 'eager';
     useHash?: boolean;
 }
 
@@ -333,6 +336,18 @@ export class GuardsCheckStart extends RouterEvent {
 // @public
 export type InitialNavigation = 'disabled' | 'enabledBlocking' | 'enabledNonBlocking';
 
+// @public
+export type InitialNavigationFeature = EnabledBlockingInitialNavigationFeature | DisabledInitialNavigationFeature;
+
+// @public
+export type InMemoryScrollingFeature = RouterFeature<RouterFeatureKind.InMemoryScrollingFeature>;
+
+// @public
+export interface InMemoryScrollingOptions {
+    anchorScrolling?: 'disabled' | 'enabled';
+    scrollPositionRestoration?: 'disabled' | 'enabled' | 'top';
+}
+
 // @public
 export interface IsActiveMatchOptions {
     fragment: 'exact' | 'ignored';
@@ -494,6 +509,9 @@ export class PreloadAllModules implements PreloadingStrategy {
     static ɵprov: i0.ɵɵInjectableDeclaration<PreloadAllModules>;
 }
 
+// @public
+export type PreloadingFeature = RouterFeature<RouterFeatureKind.PreloadingFeature>;
+
 // @public
 export abstract class PreloadingStrategy {
     // (undocumented)
@@ -503,6 +521,9 @@ export abstract class PreloadingStrategy {
 // @public
 export const PRIMARY_OUTLET = "primary";
 
+// @public
+export function provideRouter(routes: Routes, ...features: RouterFeatures[]): Provider[];
+
 // @public
 export function provideRoutes(routes: Routes): Provider[];
 
@@ -651,6 +672,17 @@ export const ROUTER_CONFIGURATION: InjectionToken<ExtraOptions>;
 // @public
 export const ROUTER_INITIALIZER: InjectionToken<(compRef: ComponentRef<any>) => void>;
 
+// @public
+export interface RouterConfigOptions {
+    canceledNavigationResolution?: 'replace' | 'computed';
+    onSameUrlNavigation?: 'reload' | 'ignore';
+    paramsInheritanceStrategy?: 'emptyOnly' | 'always';
+    urlUpdateStrategy?: 'deferred' | 'eager';
+}
+
+// @public
+export type RouterConfigurationFeature = RouterFeature<RouterFeatureKind.RouterConfigurationFeature>;
+
 // @public
 export abstract class RouteReuseStrategy {
     abstract retrieve(route: ActivatedRouteSnapshot): DetachedRouteHandle | null;
@@ -669,6 +701,17 @@ export class RouterEvent {
     url: string;
 }
 
+// @public
+export interface RouterFeature<FeatureKind extends RouterFeatureKind> {
+    // (undocumented)
+    ɵkind: FeatureKind;
+    // (undocumented)
+    ɵproviders: Provider[];
+}
+
+// @public
+export type RouterFeatures = PreloadingFeature | DebugTracingFeature | InitialNavigationFeature | InMemoryScrollingFeature | RouterConfigurationFeature;
+
 // @public
 export class RouterLink implements OnChanges {
     constructor(router: Router, route: ActivatedRoute, tabIndexAttribute: string | null | undefined, renderer: Renderer2, el: ElementRef);
@@ -1002,6 +1045,24 @@ export class UrlTree {
 // @public (undocumented)
 export const VERSION: Version;
 
+// @public
+export function withDebugTracing(): DebugTracingFeature;
+
+// @public
+export function withDisabledInitialNavigation(): DisabledInitialNavigationFeature;
+
+// @public
+export function withEnabledBlockingInitialNavigation(): EnabledBlockingInitialNavigationFeature;
+
+// @public
+export function withInMemoryScrolling(options?: InMemoryScrollingOptions): InMemoryScrollingFeature;
+
+// @public
+export function withPreloading(preloadingStrategy: Type<PreloadingStrategy>): PreloadingFeature;
+
+// @public
+export function withRouterConfig(options: RouterConfigOptions): RouterConfigurationFeature;
+
 // (No @packageDocumentation comment for this package)
 
 ```

goldens/size-tracking/integration-payloads.json

@@ -26,16 +26,16 @@
   "cli-hello-world-ivy-i18n": {
     "uncompressed": {
       "runtime": 926,
-      "main": 124910,
-      "polyfills": 35252
+      "main": 124860,
+      "polyfills": 35246
     }
   },
   "cli-hello-world-lazy": {
     "uncompressed": {
       "runtime": 2835,
-      "main": 238737,
+      "main": 226893,
       "polyfills": 33842,
-      "src_app_lazy_lazy_module_ts": 780
+      "src_app_lazy_lazy_routes_ts": 487
     }
   },
   "forms": {
@@ -48,7 +48,7 @@
   "animations": {
     "uncompressed": {
       "runtime": 1070,
-      "main": 157064,
+      "main": 156816,
       "polyfills": 33814
     }
   },

integration/cli-hello-world-lazy/src/app/app.component.spec.ts

@@ -6,8 +6,7 @@ describe('AppComponent', () => {
   beforeEach(waitForAsync(() => {
     TestBed
         .configureTestingModule({
-          imports: [RouterTestingModule],
-          declarations: [AppComponent],
+          imports: [AppComponent],
         })
         .compileComponents();
   }));

integration/cli-hello-world-lazy/src/app/app.component.ts

@@ -1,9 +1,12 @@
-import { Component } from '@angular/core';
+import {CommonModule} from '@angular/common';
+import {Component} from '@angular/core';
+import {RouterOutlet} from '@angular/router';
 
 @Component({
   selector: 'app-root',
+  standalone: true,
+  imports: [RouterOutlet, CommonModule],
   templateUrl: './app.component.html',
-  styleUrls: ['./app.component.css']
 })
 export class AppComponent {
   title = 'cli-hello-world-lazy';

integration/cli-hello-world-lazy/src/app/app.routes.ts

@@ -0,0 +1,7 @@
+import {Routes} from '@angular/router';
+
+
+export const appRoutes: Routes = [{
+  path: 'lazy',
+  loadChildren: () => import('./lazy/lazy.routes').then(routes => routes.lazyRoutes),
+}];

integration/cli-hello-world-lazy/src/app/lazy/lazy.component.ts

@@ -1,15 +1,9 @@
-import { Component, OnInit } from '@angular/core';
+import {Component} from '@angular/core';
 
 @Component({
+  standalone: true,
   selector: 'app-lazy',
-  templateUrl: './lazy.component.html',
-  styleUrls: ['./lazy.component.css']
+  template: '<p>lazy works!</p>',
 })
-export class LazyComponent implements OnInit {
-
-  constructor() { }
-
-  ngOnInit() {
-  }
-
+export class LazyComponent {
 }

integration/cli-hello-world-lazy/src/app/lazy/lazy.routes.ts

@@ -0,0 +1,5 @@
+import {Routes} from '@angular/router';
+
+import {LazyComponent} from './lazy.component';
+
+export const lazyRoutes: Routes = [{path: '', component: LazyComponent}];

integration/cli-hello-world-lazy/src/main.ts

@@ -1,12 +1,18 @@
-import { enableProdMode } from '@angular/core';
-import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
+import {enableProdMode} from '@angular/core';
+import {bootstrapApplication, provideProtractorTestingSupport} from '@angular/platform-browser';
+import {provideRouter} from '@angular/router';
 
-import { AppModule } from './app/app.module';
-import { environment } from './environments/environment';
+import {AppComponent} from './app/app.component';
+import {appRoutes} from './app/app.routes';
+import {environment} from './environments/environment';
 
 if (environment.production) {
   enableProdMode();
 }
 
-platformBrowserDynamic().bootstrapModule(AppModule)
-  .catch(err => console.error(err));
+bootstrapApplication(AppComponent, {
+  providers: [
+    provideRouter(appRoutes),
+    provideProtractorTestingSupport(),
+  ]
+}).catch(console.error);