import { HexString } from '@gear-js/api';
declare function useIsVoucherExists(programId: HexString | undefined, accountAddress: HexString | undefined): {
    isVoucherExists: boolean | undefined;
    isVoucherExistsReady: boolean;
};
declare function useIsAccountVoucherExists(programId: HexString | undefined): {
    isVoucherExists: boolean | undefined;
    isVoucherExistsReady: boolean;
};
export { useIsVoucherExists, useIsAccountVoucherExists };