Usando la biblioteca NGRX para redux, tratando de agrupar el estado de la aplicación como se muestra a continuación

 export interface ApplicationState { adminState: AdminState } export interface AdminState { adminProductCategory: ProductCategoryState; adminProductVendor: VendorState; adminProductSubCategory: ProductSubCategoryState; products: ProductsState; product: ProductState }

Para el módulo de la aplicación

 imports: [ StoreModule.forRoot(reducers, { metaReducers }), EffectsModule.forRoot([]), StoreDevtoolsModule.instrument({ maxAge: 25 }) ],

Índice.ts

 export const reducers: ActionReducerMap<ApplicationState> = { adminState: AdminState = { adminProductCategory: AdminProductCategoryReducer, adminProductVendor: AdminProductVendorReducer, adminProductSubCategory: AdminProductSubCategoryReducer, products: ProductsReducer, product: ProductReducer, } }; export const metaReducers: MetaReducer<ApplicationState>[] = [];

Excepción

 Type '{ adminProductCategory: (state: ProductCategoryState, action: Action) => any; adminProductVendor: (state: VendorState, action: Action) => any; adminProductSubCategory: (state: ProductSubCategoryState, action: Action) => any; products: (state: ProductsState, action: Action) => any; product: (state: ProductState, acti...' is not assignable to type 'ActionReducer<AdminState, Action>'. 'AdminState' only refers to a type, but is being used as a value here.

reductor

 export function AdminProductCategoryReducer(state: ProductCategoryState | undefined, action: Action): any { return reducer(state, action); }