Advanced Features

/**
 * Sets up providers for Router functionality
 * @param routes Route configuration array
 * @param features Additional router features
 * @returns Environment providers for router
 */
function provideRouter(routes: Routes, ...features: RouterFeatures[]): EnvironmentProviders;

/**
 * Registers DI provider for set of routes (deprecated, use provideRouter)
 * @param routes Route configuration array
 * @returns Provider array
 */
function provideRoutes(routes: Routes): Provider[];

/**
 * NgModule for router functionality
 */
class RouterModule {
  /**
   * Creates module with router service for root module
   * @param routes Route configuration
   * @param config Optional extra configuration
   * @returns Module with providers
   */
  static forRoot(routes: Routes, config?: ExtraOptions): ModuleWithProviders<RouterModule>;
  
  /**
   * Creates module for feature modules
   * @param routes Route configuration
   * @returns Module with providers
   */
  static forChild(routes: Routes): ModuleWithProviders<RouterModule>;
}

// Standalone application setup
import { bootstrapApplication } from '@angular/platform-browser';
import { 
  provideRouter, 
  withPreloading, 
  withComponentInputBinding,
  withViewTransitions,
  PreloadAllModules 
} from '@angular/router';

bootstrapApplication(AppComponent, {
  providers: [
    provideRouter(routes,
      withPreloading(PreloadAllModules),
      withComponentInputBinding(),
      withViewTransitions({
        skipInitialTransition: true
      })
    )
  ]
});

// NgModule-based setup
@NgModule({
  imports: [
    RouterModule.forRoot(routes, {
      preloadingStrategy: PreloadAllModules,
      enableTracing: false,
      bindToComponentInputs: true,
      enableViewTransitions: true
    })
  ],
  providers: []
})
export class AppModule {}

// Feature module setup
@NgModule({
  imports: [
    RouterModule.forChild(featureRoutes)
  ]
})
export class FeatureModule {}

/**
 * Configure in-memory scrolling behavior
 * @param options Scrolling configuration options
 * @returns In-memory scrolling feature
 */
function withInMemoryScrolling(options?: InMemoryScrollingOptions): InMemoryScrollingFeature;

/**
 * Enable blocking initial navigation
 * @returns Enabled blocking initial navigation feature
 */
function withEnabledBlockingInitialNavigation(): EnabledBlockingInitialNavigationFeature;

/**
 * Disable initial navigation
 * @returns Disabled initial navigation feature
 */
function withDisabledInitialNavigation(): DisabledInitialNavigationFeature;

/**
 * Enable debug tracing for navigation
 * @returns Debug tracing feature
 */
function withDebugTracing(): DebugTracingFeature;

/**
 * Configure preloading strategy
 * @param preloadingStrategy Strategy class for preloading
 * @returns Preloading feature
 */
function withPreloading(preloadingStrategy: Type<PreloadingStrategy>): PreloadingFeature;

/**
 * Configure router options
 * @param options Router configuration options
 * @returns Router configuration feature
 */
function withRouterConfig(options: RouterConfigOptions): RouterConfigurationFeature;

/**
 * Enable hash-based location strategy
 * @returns Router hash location feature
 */
function withHashLocation(): RouterHashLocationFeature;

/**
 * Configure navigation error handler
 * @param handler Error handler function
 * @returns Navigation error handler feature
 */
function withNavigationErrorHandler(
  handler: (error: NavigationError) => unknown | RedirectCommand
): NavigationErrorHandlerFeature;

/**
 * Enable component input binding from route data
 * @returns Component input binding feature
 */
function withComponentInputBinding(): ComponentInputBindingFeature;

/**
 * Enable view transitions for navigation
 * @param options View transitions configuration
 * @returns View transitions feature
 */
function withViewTransitions(options?: ViewTransitionsFeatureOptions): ViewTransitionsFeature;

import { 
  provideRouter,
  withPreloading,
  withInMemoryScrolling,
  withDebugTracing,
  withComponentInputBinding,
  withViewTransitions,
  withNavigationErrorHandler,
  PreloadAllModules
} from '@angular/router';

// Complete configuration example
bootstrapApplication(AppComponent, {
  providers: [
    provideRouter(routes,
      // Preload all lazy-loaded modules
      withPreloading(PreloadAllModules),
      
      // Configure scrolling behavior
      withInMemoryScrolling({
        scrollPositionRestoration: 'top',
        anchorScrolling: 'enabled'
      }),
      
      // Enable debug tracing (development only)
      withDebugTracing(),
      
      // Bind route data to component inputs
      withComponentInputBinding(),
      
      // Enable view transitions
      withViewTransitions({
        skipInitialTransition: true,
        onViewTransitionCreated: (transitionInfo) => {
          console.log('View transition created:', transitionInfo);
        }
      }),
      
      // Custom error handling
      withNavigationErrorHandler((error) => {
        console.error('Navigation error:', error);
        // Return redirect command or handle error
        if (error.message.includes('access denied')) {
          return new RedirectCommand(router.createUrlTree(['/login']));
        }
        return null;
      })
    )
  ]
});

// Custom preloading strategy
@Injectable({
  providedIn: 'root'
})
export class CustomPreloadingStrategy implements PreloadingStrategy {
  preload(route: Route, fn: () => Observable<any>): Observable<any> {
    // Only preload routes marked for preloading
    if (route.data && route.data['preload']) {
      console.log('Preloading route:', route.path);
      return fn();
    }
    
    // Don't preload this route
    return of(null);
  }
}

// Use custom preloading strategy
provideRouter(routes,
  withPreloading(CustomPreloadingStrategy)
);

/**
 * Abstract base class for preloading strategies
 */
abstract class PreloadingStrategy {
  /**
   * Preload a route
   * @param route Route to preload
   * @param fn Function to call for preloading
   * @returns Observable of preload result
   */
  abstract preload(route: Route, fn: () => Observable<any>): Observable<any>;
}

/**
 * Preloading strategy that preloads all modules as quickly as possible
 * Injectable service provided at root level
 */
class PreloadAllModules implements PreloadingStrategy {
  preload(route: Route, fn: () => Observable<any>): Observable<any>;
}

/**
 * Preloading strategy that does not preload any modules (default)
 * Injectable service provided at root level
 */
class NoPreloading implements PreloadingStrategy {
  preload(route: Route, fn: () => Observable<any>): Observable<any>;
}

/**
 * Service that optimistically loads router configurations
 * Injectable service provided at root level
 */
class RouterPreloader {
  /**
   * Sets up preloading listeners
   */
  setUpPreloading(): void;
  
  /**
   * Triggers preloading
   * @returns Observable of preload results
   */
  preload(): Observable<any>;
}

import { Injectable } from '@angular/core';
import { PreloadingStrategy, Route } from '@angular/router';
import { Observable, of } from 'rxjs';
import { delay, switchMap } from 'rxjs/operators';

// Custom selective preloading strategy
@Injectable({
  providedIn: 'root'
})
export class SelectivePreloadingStrategy implements PreloadingStrategy {
  preload(route: Route, fn: () => Observable<any>): Observable<any> {
    // Check if route should be preloaded
    if (route.data && route.data['preload'] === true) {
      console.log(`Preloading route: ${route.path}`);
      return fn();
    }
    
    // Don't preload
    return of(null);
  }
}

// Network-aware preloading strategy
@Injectable({
  providedIn: 'root'
})
export class NetworkAwarePreloadingStrategy implements PreloadingStrategy {
  preload(route: Route, fn: () => Observable<any>): Observable<any> {
    // Check network connection
    const connection = (navigator as any).connection;
    
    if (connection) {
      // Only preload on fast connections
      if (connection.effectiveType === '4g') {
        return fn();
      }
      
      // Delay preloading on slower connections
      if (connection.effectiveType === '3g') {
        return fn().pipe(delay(2000));
      }
    }
    
    // Default behavior for unknown connections
    return fn();
  }
}

// Time-based preloading strategy
@Injectable({
  providedIn: 'root'
})
export class DelayedPreloadingStrategy implements PreloadingStrategy {
  preload(route: Route, fn: () => Observable<any>): Observable<any> {
    const delayMs = route.data?.['preloadDelay'] || 0;
    
    if (delayMs > 0) {
      console.log(`Preloading route ${route.path} after ${delayMs}ms delay`);
      return of(null).pipe(
        delay(delayMs),
        switchMap(() => fn())
      );
    }
    
    return fn();
  }
}

// Route configuration with preloading hints
const routes: Routes = [
  {
    path: 'feature1',
    loadChildren: () => import('./feature1/feature1.module').then(m => m.Feature1Module),
    data: { preload: true }
  },
  {
    path: 'feature2',
    loadChildren: () => import('./feature2/feature2.module').then(m => m.Feature2Module),
    data: { preload: true, preloadDelay: 5000 }
  },
  {
    path: 'admin',
    loadChildren: () => import('./admin/admin.module').then(m => m.AdminModule),
    data: { preload: false } // Don't preload admin module
  }
];

/**
 * Abstract base class for route reuse strategies
 * Injectable service provided at root level
 */
abstract class RouteReuseStrategy {
  /**
   * Determines if route component should be detached for reuse
   * @param route Activated route snapshot
   * @returns True if component should be detached
   */
  abstract shouldDetach(route: ActivatedRouteSnapshot): boolean;
  
  /**
   * Store detached route handle
   * @param route Activated route snapshot
   * @param handle Detached route handle or null
   */
  abstract store(route: ActivatedRouteSnapshot, handle: DetachedRouteHandle | null): void;
  
  /**
   * Determines if route should be reattached
   * @param route Activated route snapshot
   * @returns True if route should be reattached
   */
  abstract shouldAttach(route: ActivatedRouteSnapshot): boolean;
  
  /**
   * Retrieve stored route handle
   * @param route Activated route snapshot
   * @returns Stored route handle or null
   */
  abstract retrieve(route: ActivatedRouteSnapshot): DetachedRouteHandle | null;
  
  /**
   * Determines if route should be reused
   * @param future Future activated route
   * @param curr Current activated route
   * @returns True if route should be reused
   */
  abstract shouldReuseRoute(future: ActivatedRouteSnapshot, curr: ActivatedRouteSnapshot): boolean;
}

/**
 * Base implementation that only reuses routes when router configs are identical
 */
abstract class BaseRouteReuseStrategy implements RouteReuseStrategy {
  shouldReuseRoute(future: ActivatedRouteSnapshot, curr: ActivatedRouteSnapshot): boolean;
}

/**
 * Default route reuse strategy extending BaseRouteReuseStrategy
 * Injectable service provided at root level
 */
class DefaultRouteReuseStrategy extends BaseRouteReuseStrategy {
  shouldDetach(route: ActivatedRouteSnapshot): boolean;
  store(route: ActivatedRouteSnapshot, handle: DetachedRouteHandle | null): void;
  shouldAttach(route: ActivatedRouteSnapshot): boolean;
  retrieve(route: ActivatedRouteSnapshot): DetachedRouteHandle | null;
}

import { Injectable } from '@angular/core';
import { 
  RouteReuseStrategy, 
  ActivatedRouteSnapshot, 
  DetachedRouteHandle 
} from '@angular/router';

// Custom route reuse strategy for tab-like behavior
@Injectable({
  providedIn: 'root'
})
export class CustomRouteReuseStrategy implements RouteReuseStrategy {
  private storedRoutes = new Map<string, DetachedRouteHandle>();
  
  shouldDetach(route: ActivatedRouteSnapshot): boolean {
    // Detach routes marked for reuse
    return route.data && route.data['reuseRoute'] === true;
  }
  
  store(route: ActivatedRouteSnapshot, handle: DetachedRouteHandle | null): void {
    if (handle) {
      const key = this.getRouteKey(route);
      this.storedRoutes.set(key, handle);
      console.log(`Stored route: ${key}`);
    }
  }
  
  shouldAttach(route: ActivatedRouteSnapshot): boolean {
    const key = this.getRouteKey(route);
    return this.storedRoutes.has(key);
  }
  
  retrieve(route: ActivatedRouteSnapshot): DetachedRouteHandle | null {
    const key = this.getRouteKey(route);
    const handle = this.storedRoutes.get(key) || null;
    
    if (handle) {
      console.log(`Retrieved route: ${key}`);
    }
    
    return handle;
  }
  
  shouldReuseRoute(future: ActivatedRouteSnapshot, curr: ActivatedRouteSnapshot): boolean {
    // Reuse if route config is the same
    return future.routeConfig === curr.routeConfig;
  }
  
  private getRouteKey(route: ActivatedRouteSnapshot): string {
    return route.routeConfig?.path || '';
  }
}

// Provide custom route reuse strategy
@NgModule({
  providers: [
    { provide: RouteReuseStrategy, useClass: CustomRouteReuseStrategy }
  ]
})
export class AppModule {}

// Route configuration with reuse hints
const routes: Routes = [
  {
    path: 'dashboard',
    component: DashboardComponent,
    data: { reuseRoute: true }
  },
  {
    path: 'reports',
    component: ReportsComponent,
    data: { reuseRoute: true }
  },
  {
    path: 'settings',
    component: SettingsComponent,
    data: { reuseRoute: false } // Always create new instance
  }
];

// Advanced reuse strategy with cleanup
@Injectable({
  providedIn: 'root'
})
export class AdvancedRouteReuseStrategy implements RouteReuseStrategy {
  private storedRoutes = new Map<string, {
    handle: DetachedRouteHandle,
    timestamp: number
  }>();
  
  private maxAge = 5 * 60 * 1000; // 5 minutes
  private maxRoutes = 10;
  
  shouldDetach(route: ActivatedRouteSnapshot): boolean {
    // Clean up old routes
    this.cleanup();
    
    return route.data?.['reuseRoute'] === true;
  }
  
  store(route: ActivatedRouteSnapshot, handle: DetachedRouteHandle | null): void {
    if (handle && this.storedRoutes.size < this.maxRoutes) {
      const key = this.getRouteKey(route);
      this.storedRoutes.set(key, {
        handle,
        timestamp: Date.now()
      });
    }
  }
  
  shouldAttach(route: ActivatedRouteSnapshot): boolean {
    const key = this.getRouteKey(route);
    const stored = this.storedRoutes.get(key);
    
    if (stored) {
      // Check if route is too old
      const age = Date.now() - stored.timestamp;
      if (age > this.maxAge) {
        this.storedRoutes.delete(key);
        return false;
      }
      return true;
    }
    
    return false;
  }
  
  retrieve(route: ActivatedRouteSnapshot): DetachedRouteHandle | null {
    const key = this.getRouteKey(route);
    const stored = this.storedRoutes.get(key);
    return stored ? stored.handle : null;
  }
  
  shouldReuseRoute(future: ActivatedRouteSnapshot, curr: ActivatedRouteSnapshot): boolean {
    return future.routeConfig === curr.routeConfig;
  }
  
  private getRouteKey(route: ActivatedRouteSnapshot): string {
    // Create unique key including parameters
    const path = route.routeConfig?.path || '';
    const params = Object.keys(route.params)
      .sort()
      .map(key => `${key}:${route.params[key]}`)
      .join('|');
    
    return params ? `${path}?${params}` : path;
  }
  
  private cleanup(): void {
    const now = Date.now();
    
    for (const [key, stored] of this.storedRoutes.entries()) {
      if (now - stored.timestamp > this.maxAge) {
        this.storedRoutes.delete(key);
      }
    }
  }
}

/**
 * Abstract base class for title strategies
 * Injectable service provided at root level
 */
abstract class TitleStrategy {
  /**
   * Update page title based on router state
   * @param snapshot Router state snapshot
   */
  abstract updateTitle(snapshot: RouterStateSnapshot): void;
  
  /**
   * Build title from router state snapshot
   * @param snapshot Router state snapshot
   * @returns Built title string or undefined
   */
  buildTitle(snapshot: RouterStateSnapshot): string | undefined;
  
  /**
   * Get resolved title for specific route
   * @param snapshot Activated route snapshot
   * @returns Resolved title value
   */
  getResolvedTitleForRoute(snapshot: ActivatedRouteSnapshot): any;
}

/**
 * Default title strategy extending TitleStrategy
 * Injectable service provided at root level
 */
class DefaultTitleStrategy extends TitleStrategy {
  updateTitle(snapshot: RouterStateSnapshot): void;
}

import { Injectable } from '@angular/core';
import { Title } from '@angular/platform-browser';
import { 
  TitleStrategy, 
  RouterStateSnapshot, 
  ActivatedRouteSnapshot 
} from '@angular/router';

// Custom title strategy with prefix and suffix
@Injectable({
  providedIn: 'root'
})
export class CustomTitleStrategy extends TitleStrategy {
  constructor(private title: Title) {
    super();
  }
  
  updateTitle(routerState: RouterStateSnapshot): void {
    const title = this.buildTitle(routerState);
    
    if (title) {
      // Add app name prefix
      this.title.setTitle(`MyApp - ${title}`);
    } else {
      // Default title
      this.title.setTitle('MyApp');
    }
  }
  
  override buildTitle(routerState: RouterStateSnapshot): string | undefined {
    // Walk through route tree to build hierarchical title
    const titles: string[] = [];
    let route = routerState.root;
    
    while (route) {
      const routeTitle = this.getResolvedTitleForRoute(route);
      if (routeTitle) {
        titles.push(routeTitle);
      }
      
      route = route.firstChild;
    }
    
    return titles.length > 0 ? titles.join(' | ') : undefined;
  }
}

// Advanced title strategy with breadcrumbs
@Injectable({
  providedIn: 'root'
})
export class BreadcrumbTitleStrategy extends TitleStrategy {
  constructor(private title: Title) {
    super();
  }
  
  updateTitle(routerState: RouterStateSnapshot): void {
    const breadcrumbs = this.buildBreadcrumbs(routerState);
    const title = breadcrumbs.join(' › ');
    
    if (title) {
      this.title.setTitle(`${title} - MyApp`);
    } else {
      this.title.setTitle('MyApp');
    }
    
    // Also emit breadcrumbs for navigation component
    this.emitBreadcrumbs(breadcrumbs);
  }
  
  private buildBreadcrumbs(routerState: RouterStateSnapshot): string[] {
    const breadcrumbs: string[] = [];
    let route: ActivatedRouteSnapshot | null = routerState.root;
    
    while (route) {
      // Check for breadcrumb data
      const breadcrumb = route.data['breadcrumb'];
      const title = this.getResolvedTitleForRoute(route);
      
      if (breadcrumb) {
        breadcrumbs.push(breadcrumb);
      } else if (title) {
        breadcrumbs.push(title);
      }
      
      route = route.firstChild;
    }
    
    return breadcrumbs.filter(b => b); // Remove empty breadcrumbs
  }
  
  private emitBreadcrumbs(breadcrumbs: string[]): void {
    // Emit to a service or subject for breadcrumb component
    // this.breadcrumbService.updateBreadcrumbs(breadcrumbs);
  }
}

// Route configuration with title and breadcrumb data
const routes: Routes = [
  {
    path: 'dashboard',
    component: DashboardComponent,
    title: 'Dashboard',
    data: { breadcrumb: 'Home' }
  },
  {
    path: 'users',
    component: UsersComponent,
    title: 'Users',
    data: { breadcrumb: 'Users' },
    children: [
      {
        path: ':id',
        component: UserDetailComponent,
        title: userTitleResolver,
        data: { breadcrumb: 'User Details' }
      }
    ]
  },
  {
    path: 'settings',
    component: SettingsComponent,
    title: 'Settings',
    data: { breadcrumb: 'Settings' },
    children: [
      {
        path: 'profile',
        component: ProfileSettingsComponent,
        title: 'Profile Settings',
        data: { breadcrumb: 'Profile' }
      }
    ]
  }
];

// Title resolver function (add necessary imports)
import { inject } from '@angular/core';
import { ResolveFn } from '@angular/router';
import { map, catchError, of } from 'rxjs';

export const userTitleResolver: ResolveFn<string> = (route, state) => {
  const userService = inject(UserService);
  const userId = route.paramMap.get('id')!;
  
  return userService.getUser(userId).pipe(
    map(user => `${user.firstName} ${user.lastName}`),
    catchError(() => of('User'))
  );
};

// Provide custom title strategy
@NgModule({
  providers: [
    { provide: TitleStrategy, useClass: CustomTitleStrategy }
  ]
})
export class AppModule {}

/**
 * Extra options for router configuration
 */
interface ExtraOptions extends InMemoryScrollingOptions, RouterConfigOptions {
  /** Enable tracing of navigation events */
  enableTracing?: boolean;
  /** Use hash-based location strategy */
  useHash?: boolean;
  /** Initial navigation configuration */
  initialNavigation?: InitialNavigation;
  /** Bind route data to component inputs */
  bindToComponentInputs?: boolean;
  /** Enable view transitions */
  enableViewTransitions?: boolean;
  /** Custom navigation error handler */
  errorHandler?: (error: NavigationError) => any;
  /** Preloading strategy */
  preloadingStrategy?: Type<PreloadingStrategy>;
  /** Scroll offset configuration */
  scrollOffset?: [number, number] | (() => [number, number]);
}

/**
 * Router configuration options
 */
interface RouterConfigOptions {
  /** How to handle canceled navigation */
  canceledNavigationResolution?: 'replace' | 'computed';
  /** How to handle same URL navigation */
  onSameUrlNavigation?: 'reload' | 'ignore';
  /** Parameters inheritance strategy */
  paramsInheritanceStrategy?: 'emptyOnly' | 'always';
  /** URL update strategy */
  urlUpdateStrategy?: 'deferred' | 'eager';
  /** Default query parameters handling */
  defaultQueryParamsHandling?: QueryParamsHandling;
  /** Resolve navigation promise on error */
  resolveNavigationPromiseOnError?: boolean;
}

/**
 * In-memory scrolling options
 */
interface InMemoryScrollingOptions {
  /** Anchor scrolling behavior */
  anchorScrolling?: 'disabled' | 'enabled';
  /** Scroll position restoration */
  scrollPositionRestoration?: 'disabled' | 'enabled' | 'top';
}

type InitialNavigation = 'disabled' | 'enabled' | 'enabledBlocking' | 'enabledNonBlocking';

type DetachedRouteHandle = {};
type RouterFeatures = PreloadingFeature | InMemoryScrollingFeature | 
                     EnabledBlockingInitialNavigationFeature | DisabledInitialNavigationFeature |
                     DebugTracingFeature | RouterConfigurationFeature | RouterHashLocationFeature |
                     NavigationErrorHandlerFeature | ComponentInputBindingFeature | ViewTransitionsFeature;

interface ViewTransitionsFeatureOptions {
  /** Skip initial transition */
  skipInitialTransition?: boolean;
  /** Callback when view transition is created */
  onViewTransitionCreated?: (transitionInfo: ViewTransitionInfo) => void;
}

interface ViewTransitionInfo {
  /** View transition object */
  transition: ViewTransition;
  /** Source route snapshot */
  from: ActivatedRouteSnapshot;
  /** Target route snapshot */
  to: ActivatedRouteSnapshot;
}

/**
 * Constants and tokens
 */
const VERSION: Version;
const PRIMARY_OUTLET = 'primary';

/**
 * Injection tokens
 */
const ROUTES: InjectionToken<Route[][]>;
const ROUTER_CONFIGURATION: InjectionToken<ExtraOptions>;
const ROUTER_INITIALIZER: InjectionToken<() => void>;
const ROUTER_OUTLET_DATA: InjectionToken<unknown>;

/**
 * Service for managing outlet contexts
 * Injectable service that tracks outlet contexts for child routes
 */
@Injectable({providedIn: 'root'})
class ChildrenOutletContexts {
  /** 
   * Get or create context for outlet
   * @param childName Name of the child outlet
   * @returns OutletContext for the child
   */
  getOrCreateContext(childName: string): OutletContext;
  
  /** 
   * Get existing context for outlet
   * @param childName Name of the child outlet
   * @returns OutletContext or null if not found
   */
  getContext(childName: string): OutletContext | null;
  
  /**
   * Remove context for outlet
   * @param childName Name of the child outlet
   */
  removeContext(childName: string): void;
}

/**
 * Context information for router outlets
 * Holds state and context for individual outlets
 */
class OutletContext {
  /** Reference to the outlet */
  outlet: RouterOutletContract | null;
  /** Route associated with outlet */
  route: ActivatedRoute | null;
  /** Injector for outlet */
  injector: Injector | null;
  /** Child contexts */
  children: ChildrenOutletContexts;
  /** Attachment reference */
  attachRef: ComponentRef<any> | null;
}

/**
 * Base route reuse strategy with default implementation
 * Extends RouteReuseStrategy with common reuse logic
 */
abstract class BaseRouteReuseStrategy implements RouteReuseStrategy {
  /** Whether routes should be reused (default implementation) */
  shouldReuseRoute(future: ActivatedRouteSnapshot, curr: ActivatedRouteSnapshot): boolean;
  
  abstract shouldDetach(route: ActivatedRouteSnapshot): boolean;
  abstract store(route: ActivatedRouteSnapshot, handle: DetachedRouteHandle): void;  
  abstract shouldAttach(route: ActivatedRouteSnapshot): boolean;
  abstract retrieve(route: ActivatedRouteSnapshot): DetachedRouteHandle | null;
}

import { Injectable, inject } from '@angular/core';
import { ChildrenOutletContexts, OutletContext } from '@angular/router';

@Injectable({
  providedIn: 'root'
})
export class CustomOutletManager {
  private contexts = inject(ChildrenOutletContexts);
  
  // Get context for specific outlet
  getOutletContext(outletName: string): OutletContext | null {
    return this.contexts.getContext(outletName);
  }
  
  // Check if outlet is active
  isOutletActive(outletName: string): boolean {
    const context = this.contexts.getContext(outletName);
    return context && context.outlet && context.outlet.isActivated;
  }
  
  // Get component from outlet
  getOutletComponent(outletName: string): any {
    const context = this.contexts.getContext(outletName);
    return context?.outlet?.component || null;
  }
}

// Custom route reuse strategy extending BaseRouteReuseStrategy
@Injectable({
  providedIn: 'root'
})
export class CustomRouteReuseStrategy extends BaseRouteReuseStrategy {
  private storedRoutes = new Map<string, DetachedRouteHandle>();
  
  // Only cache specific routes
  shouldDetach(route: ActivatedRouteSnapshot): boolean {
    return route.data['reuseRoute'] === true;
  }
  
  store(route: ActivatedRouteSnapshot, handle: DetachedRouteHandle): void {
    const key = this.createKey(route);
    this.storedRoutes.set(key, handle);
  }
  
  shouldAttach(route: ActivatedRouteSnapshot): boolean {
    const key = this.createKey(route);
    return this.storedRoutes.has(key);
  }
  
  retrieve(route: ActivatedRouteSnapshot): DetachedRouteHandle | null {
    const key = this.createKey(route);
    return this.storedRoutes.get(key) || null;
  }
  
  private createKey(route: ActivatedRouteSnapshot): string {
    return route.routeConfig?.path || '';
  }
}