Recures - Effects

const userManagementReducer = createReducer(
  initialState,
  on(UserManagementActions.getUsersList, state => ({...state})),
  on(UserManagementActions.usersListLoaded, (state, { payload }) => ({...state, usersList: payload}))
);

........

@Effect()
getUsersList$: Observable<any> = this.actions$
    .pipe(
      ofType(userManagementActions.getUsersList.type),
      mergeMap(() => this.userManagementService.getUsersList()
        .pipe(
          map(users => (userManagementActions.usersListLoaded({payload: users})))
        )
      )
    );