import { AccountId } from '@plugnet/types/interfaces';
import { Observable } from 'rxjs';
import { ApiInterfaceRx } from '@plugnet/api/types';
import { Option } from '@plugnet/types';
/**
 * @description From the list of stash accounts, retrieve the list of controllers
 */
export declare function controllers(api: ApiInterfaceRx): () => Observable<[AccountId[], Option<AccountId>[]]>;