import type { ExtendedViemClient } from '../../../client.js';
import type { Provider } from '../transports/index.js';
/**
 * Checks if a blockhash is still valid
 *
 * @param client - Extended Viem client
 * @param params - Parameters for {@link sol_isBlockhashValid}
 * @returns Promise resolving to blockhash validity status
 */
export declare function isBlockhashValid(client: ExtendedViemClient, ...params: Parameters<Provider['sol_isBlockhashValid']>): Promise<Readonly<{
    context: Readonly<{
        slot: import("@solana/rpc-types").Slot;
    }>;
    value: boolean;
}>>;