import type { Connection, PublicKey, Transaction } from "@solana/web3.js";
export declare function sendAndConfirmSigned(connection: Connection, tx: Transaction, feePayer: PublicKey, sign: (tx: Transaction) => Transaction | Promise<Transaction>): Promise<string>;
export declare const SEND_ATTEMPTS = 3;
export declare class BlockhashExpiredError extends Error {
}
export declare function pollSignature(connection: Connection, signature: string, lastValidBlockHeight: number): Promise<void>;
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