// In app.module.ts
providers: [
  {provide: RouteReuseStrategy, useClass: CustomReuseStrategy}
]

// In custom.reuse.strategy.ts
import {ActivatedRouteSnapshot, DetachedRouteHandle, RouteReuseStrategy} from '@angular/router';

export class CustomReuseStrategy implements RouteReuseStrategy {
  routesToCache: string[] = ['users'];
  storedRouteHandles = new Map<string, DetachedRouteHandle>();

  shouldDetach(route: ActivatedRouteSnapshot): boolean {
    return this.routesToCache.indexOf(route.routeConfig.path) > -1;
  }

  store(route: ActivatedRouteSnapshot, handle: DetachedRouteHandle): void {
    this.storedRouteHandles.set(route.routeConfig.path, handle);
  }

  shouldAttach(route: ActivatedRouteSnapshot): boolean {
    return this.storedRouteHandles.has(route.routeConfig.path);
  }

  retrieve(route: ActivatedRouteSnapshot): DetachedRouteHandle {
    return this.storedRouteHandles.get(route.routeConfig.path);
  }

  shouldReuseRoute(future: ActivatedRouteSnapshot, curr: ActivatedRouteSnapshot): boolean {
    return future.routeConfig === curr.routeConfig;
  }
}