add featuresFactory

npm/ng-packs/packages/core/src/lib/utils/factory-utils.ts

@@ -7,6 +7,8 @@ import {
   StaticProvider,
   Type,
 } from '@angular/core';
+import { filter, map } from 'rxjs/operators';
+import { ConfigStateService } from '../services/config-state.service';
 
 export class LazyModuleFactory<T> extends NgModuleFactory<T> {
   get moduleType(): Type<T> {
@@ -29,3 +31,11 @@ export class LazyModuleFactory<T> extends NgModuleFactory<T> {
     return factory.create(injector);
   }
 }
+
+export function featuresFactory(
+  configState: ConfigStateService,
+  featureKeys: string[],
+  mapFn: (features) => any = features => features,
+) {
+  return configState.getFeatures$(featureKeys).pipe(filter(Boolean), map(mapFn));
+}