import { Connection } from '@solana/web3.js';
/**
 * Extracts a human-readable error message from Solana transaction logs.
 */
export declare function extractTransactionError(err: any, logMessages?: string[] | null): string;
/**
 * Polls getSignatureStatuses until the transaction is confirmed, then checks for errors.
 * Throws if the transaction failed on-chain. Returns parsed transaction info on success.
 */
export declare function confirmAndCheckTransaction(connection: Connection, signature: string): Promise<any>;